A large number of acronyms are used in circuit design and electronic engineering to represent various components, parameters, signal types, and system functions. Below are some common circuit abbreviations and their meanings summarized by INFINITECH.

Common English abbreviations in circuits and their meanings

A/D: analog-to-digital conversion.

AC: communication.

ADDRESS: indicates the address line.

AF: audio.

AFC: Automatic frequency control, control of the reference frequency clock circuit. In the GSM mobile phone circuit, as long as you see the words AFC, you can immediately conclude that the signal line is controlled by the 13MHz circuit. If the signal is abnormal, the mobile phone may not enter the service state, and the serious result is that the mobile phone does not turn on. Some phones have an AFC labeled VCXOCONT.

AGC: Automatic gain control. The signal usually appears in the low noise amplifier of the receiver circuit and is used to control the front-end amplifier of the receiver to provide a relatively stable signal to the back-end circuit when the signal is of different strength.

ALERT: indicates an alarm. A receiving audio circuit that is used to alert the user to a telephone entry or operation error.

ALRT: Ringtone circuit.

AMP: amplifier. It is often used in circuit block diagrams of mobile phones.

AMPS: Advanced mobile phone system.

ANT: antenna. It is used to convert high frequency electromagnetic wave into high frequency current or high frequency signal current into high frequency electromagnetic wave. In the circuit schematic, find ANT, you can easily find the antenna and antenna circuit.

ANTSW: open switch control signal.

AOC: Automatic power control. It usually appears in the power amplifier part of the mobile phone transmitter (more commonly used in MOTOROLA mobile phones).

AOC-DRIVE: automatic power control reference level.

ASIC: application-specific integrated circuit. In the mobile phone circuit, it usually contains multiple functional circuits, providing many interfaces, mainly to complete various controls of the mobile phone.

AUC: Authentication center.

AUDIO: Audio.

AUX: auxiliary.

AVCC: Audio powered.

BACKLIGHT; Backlight.

BALUN: Balanced/unbalanced transition.

BAND: indicates the frequency band.

Band-select: SELECT a BAND. Only appears in dual-band mobile phone or tri-band mobile phone circuit. The signal controls the frequency switch of the phone.

BASEBAND: indicates the baseband signal.

B+ : Power supply.

BATT: Battery voltage.

BAND: indicates the frequency band.

BCH: indicates the broadcast channel.

BDR: Receives data signals.

BDX: Transmit data signal.

BKLT-EN: Background light control.

BIAS: indicates the bias. It is often used in Nokia mobile phone circuits to control power amplifiers or other corresponding circuits.

BOOT: indicates a mask.

BRIGHT: To shine.

BS: Base station.

BSC: Base station controller.

BSEL: Band switching.

BTS: Base station transceiver.

BSI: Battery size. In many Nokia phones, if the signal is abnormal, the phone will not turn on.

BUFFER: Buffer amplifier. It often appears in the output of VCO circuits.

BUS: indicates the communication bus.

BUZZ: A buzzer. Appears in the ringtone circuit.

BW: indicates the bandwidth.

CARD: card.

CDMA: Code division multiple access. A kind of multi-access technology, CDMA communication system capacity is larger than GSM, its micro cell is smaller, CDMA mobile phone power consumption is smaller, so CDMA mobile phone standby time is longer.

CELL: indicates a small community.

CELLULAR: Cellular.

CH: indicates the channel.

"CHECK" : check.

CHARG+ : Charging positive power supply.

CHARG- : negative end of the charging power supply.

CLK: clock. CLK appears in different places and serves different purposes. . If it is in the logic circuit, it has a great relationship with the startup of the mobile phone; If all the circuits are in the SIM card, the SIM card may fail.

CLONE. Copy.

CMOS: gold metal oxide semiconductor.

CODEC: CODEC. It mainly appears in audio coding and decoding circuits.

COL: column address line. The key circuit that appears in the phone.

COM: serial port.

CONNECTOR: indicates a connector.

CONTACTSEVICER: Contact the service provider.

CORD: code.

COUPLING: coupling.

COVER: cover.

CP: indicates the output of the phase discriminator.

CP-RX: RXVCO control signal output.

CP-TX: sends VCO control output.

CPU: Central processing unit. In the logic circuit of the mobile phone, a variety of mobile phone control is completed.

CRYSTAL: crystal oscillator.

CS: Film selection.

n/A: digital-to-analog conversion.

DATA: DAT.

DB. The data bus.

DC: DC.

DCIN: External power input.

DCON: DC connection.

DCS: Digital communication system. The operating frequency band is 1800MHz. The system uses a higher frequency than GSM, is also a digital communication system, it is a derivative of GSM. DCS shares many of the same technologies as GSM.

DCS-SEL: DCS band selection signal.

DCSPA: DCS signal output by power amplifier.

DCSRX: DCS radio frequency receiving signal.

DEMOD: indicates the demodulation.

DET: detection.

DGND: digitally.

DIGITAL: A number.

DIODE. The diode.

DISPLAY: indicates the display.

DM-CS: slice selection signal. Dedicated to MOTOROLA mobile phones, the signal is used to control the MODEM in the transmitter circuit, the transmission conversion module and the transmission

VCO circuit.

DP-EN: Display circuit start control.

DSP: digital voice processor. In the logic audio circuit, it will conduct further processing of the digital voice signal after PCM encoding.

D-TX-VCO: DCS sends VCO switching control.

DTMS: To data signal.

DFMS: data signal.

DUPLEX: indicates a duplex. It contains a receiving and transmitting RF filter between the antenna and the RF circuit.

DYNATRON: Transistor.

EAR: earpiece. Also known as receiver, speaker, speaker. It is connected to the receiving audio circuit.

EEPROM: electrically erasable read-only memory. In the phone is used to store the phone running software. If it is damaged, it will cause the phone to not turn on, software failure, etc.

EL: Glow.

EN(ENAB) : Enable.

EXT: external connection.

ERASABLE: erasable.

ETACS: Enhanced all-access communication system.

FACCH: fast uplink control channel.

FDDEBACK: feedback.

FDMA: Frequency division multiple access.

FH: Frequency hopping.

FM. Frequency modulation.

FILTER: Filter, sometimes denoted by FL. The filter has RF filter, intermediate frequency filter; High-pass filter, low-pass filter, band-pass filter, band-stop filter, etc. According to the material, there are ceramic filters, crystal filters and so on.

FLASH: name of a memory used in the circuit of a mobile phone to store words, etc.

"GAIN" : gain.

GCAP: power supply IC.

GCAP-CLK: The clock that the CPU outputs to the power module (for MOTOROLA phones).

GCLK: 32.768kHz, output to the CPU clock signal.

GIF-SYN: duplex intermediate frequency.

GND: indicates the address line. On the phone board, large pieces of copper foil are on the ground.

GREEN: green.

GSM: Global digital communications system. Originally known as the Pan-European communication system, due to the increasing number of countries and regions that later used this technical standard, it was called Global Communication.

Gsm-sel: GSM band switching signal.

GSMPA: GSM signal output by the power amplifier.

GSMRX: GSM radio frequency receiving signal.

GMSK: Gaussian minimum frequency shift keying. A digital modulation method used by both 900MHz and 1800MHz systems.

G-TX-VCO: GSM transmit VCO switching control.

HARDWARE: indicates hardware.

HEAD-INT: indicates the headset interrupt request signal.

HOOK: indicates the external hands-free status.

HRF: high-pass filter.

FO: Input/output port.

IF: intermediate frequency. If has a receiving IF RXIF and a transmitting IF TXIF. The intermediate frequencies are fixed. The received IF frequency comes from the mixer in the receiver circuit and needs to go to the demodulator to restore the received data signal; The transmitting IF from the transmitting IF VCO is used to transmit the UQ modulator as the carrier. At the receiver, the second IF frequency is always lower than the first IF frequency.

IFVCCO: intermediate frequency VCO. A second mixer for receivers or an I/Q modulator for transmitters. As long as you see IFVCO or VHFVCO, you can conclude that the receiver of this mobile phone is a superheterodyne secondary frequency receiver, with two intermediate frequencies.

IFLO: medium frequency local oscillator.

If-in IF frequency input.

IFTUNE: Medium frequency VCO control signal.

If-vcc IF frequency circuit power supply, some mobile phones are also represented by SW-VCC.

IC: Integrated circuit.

ICTRL: Power supply current size control

IMEI: International Mobile Equipment code. This number is unique and serves as the phone's identification code.

"IN" : Enter.

INSERTCARD: indicates a card.

INDUCTANCE: Inductance.

INFRAREDRAY

IP/QR: RXI/Q signal.

ISDN: Integrated Services Digital Network.

KBC: key column address line.

KEY: indicates the key.

KEYBOARD: keyboard.

KBLIGHTS: Keyboard background light control.

LAC: indicates the location area code.

LAL: Location area identifier.

LCD: liquid crystal display. Used to display some mobile phone information. At present, the LCD used by mobile phones is basically a graphical LCD, which can display graphics.

LED: light-emitting diode display. Early mobile phones often used LED displays, especially MOTOROLA mobile phones. LED display power consumption, and can not display graphics, in the mobile phone circuit, has been replaced by LCD.

LEV: level.

LI: Lithium.

LNA: Low noise amplifier. The first amplifier of the receiver, used to amplify the weak signal received by the mobile phone. If the circuit fails, the phone will have poor reception or the phone does not go online.

LNA-G: GSM low noise amplifier.

LNA-275: Commonly used in MOTOROLA mobile phones to represent a 2.75V low noise amplifier power supply.

IDGIC: logic. '

LOOPFLITER: loop filter.

LO: local oscillator.

LOCKED: Locks the machine.

LPF: low pass filter. Most occur in the frequency synthesis loop. It filters out the high frequency component in the output of the phase detector and prevents this high frequency component from interfering with the operation of the VCO.

MAINCLK(MCLK) : stands for 13MHz clock, used in MOTOROLA phones. There are also MAGIC-13MHz, Nokia mobile phones often use RFC to indicate this signal, Ericsson mobile phones often use MCLK, Panasonic mobile phones use 13MHzCLK.

MDM: modulation and demodulation.

MEMORY: Memory.

MENU: indicates the menu.

MF: Ceramic filter.

MIC: microphone, microphone, microphone, pickup, microphone. It is an acoustoelectric conversion device that converts voice signals into analog electrical signals.

MIX: mixer. In the mobile phone circuit, it usually refers to the mixer of the receiver. The mixer is the core component of the superheterodyne receiver, which converts the received high-frequency signal into a relatively low frequency IF signal.

MIX-275: Commonly used in MOTOROLA mobile phones, indicating a 2.75V mixer power supply. The mixer power supply of some mobile phones is represented by VCCMIX.

MIXOUT: mixer output.

MOBILE: indicates the mobile.

MOD: modulation.

MODIP: modulating power signal positive.

MODIN: indicates that the modulated signal is negative.

MODQP: modulates the Q signal positively.

MODQN: modulates the Q signal negatively.

MODEM: indicates the modem. MOTOROLA mobile phones use a logic RF interface circuit. It provides AFC, AOC and GMSK modulation and demodulation.

MS: Mobile station.

MSC: Mobile switching center.

MSIN: mobile station identification number.

MSRN: roaming.

MUTE: mute.

NAM: number assignment module.

NC: Empty, do not answer.

NEG: negative pressure.

NI-H: nickel metal hydride.

NI-G: nickel cadmium.

NONETWORK: no network.

OFSET: offset.

OMC: Operation and maintenance center.

ONSRQ: Hands-free switch control.

ONSWAN: power-on trigger signal.

ON/OFF: On/off control.

OSC: oscillator. The oscillator converts the DC signal into an AC signal for use by the corresponding circuit.

OUT: indicates the output.

PA: Power amplifier, ungraded circuit in transmitter.

PAC: Power control.

PA-ON: power start control

PCB: Printed circuit board. The circuits used in mobile phones are multi-layer boards.

PCH: paging channel.

PCM: Pulse code modulation.

PCMDCLK: pulse code clock.

PCMRXDATA: pulse code received data.

PCMSCLK: Pulse code sampling clock.

PCMTXDATA: pulse code sends data.

PCN: Personal communication network. A kind of digital communication system, but its title is not uniform, in some books have called PCS. In Nokia phones, the 1800M system is often labeled as PCN, while other phones are labeled as DCS.

PCS: Personal communication system.

PD: phase discriminator. Usually used in the phase-locked loop, is a signal phase comparator, it converts the signal phase change into a voltage change, we call this voltage signal phase difference signal. The output of PD in the frequency synthesizer is the control signal of VCO.

PDATA: Parallel data.

PHASE: indicates the phase.

PIN: Personal identification number.

PLL: phase locked loop. Commonly used in control and frequency synthesis circuits.

PM: Phase modulation.

POWCONTROL: Power control.

POWLEV: Power level.

POWRSRC. Power supply selection.

POWER: Power supply.

PURX: reset. Common in Nokia mobile phone circuitry.

PUK: unlock password.

PWM: pulse width modulation is used for charge control. The charge control circuit commonly found in Nokia mobile phones.

PWRLEV: Power control reference level.

Pcr-sw: indicates the power-on signal.

RAM: random access memory.

RD: Read it.

R/W: read and write.

RED: indicates red.

REF: reference.

RESET: indicates a reset.

RETC-BATT: real-time clock power supply.

RF: radio frequency.

RF-V1: Frequency synthesizer power supply (used in MOTOROLA V series phones).

Rf-v2: RF power supply (for MOTOROLA V series power supply).

RFLO: radio frequency local oscillator.

RFC: indicates the logical clock. Common in Nokia phones.

RFI: Logical radio frequency interface circuit, commonly found in Nokia mobile phone circuit.

The RFVCO. Rf VCO, used in receiver first mixer and transmitter circuit, commonly found in Samsung mobile phone circuit.

ROW: indicates the row address. Appears in the key circuit of the mobile phone.

RSSI: Received signal strength indication.

RST: reset.

RTC: real-time clock control.

RX: Receive.

RXACQ: Receive a transmission request signal.

RXEN: Receive enable (enable). In the standby state of the phone (that is, the phone is turned on, but no call is made), the signal is a pulse signal that complies with TDMA rules. If the logic circuit does not have this signal output, the mobile phone receiver cannot work normally.

RXI/Q: Receives demodulation signals. In the standby state, the oscilloscope can also measure this signal, if the phone does not have this signal, the phone can not surf the Internet.

RXIFP: receives the IF signal.

RXWN: receives a negative IF signal.

RXON. Receive start, see RXEN

RXPWR: receives power control. Common in Nokia mobile phone circuitry.

RXVCO: Receiving VCO, generally representing a vibration VCO, used for the first mixer of the receiver.

RXVCO-250:2.5VVCO power supply.

SAMPLE: Take a sample. It often appears in the output of VCO and the output of power amplifier.

SAT: Saturation.

SAW: acoustic surface filter.

SCH: indicates the synchronization channel.

SDTA: Serial data.

I have a SENSE of it.

SF: Super filter.

SF-OUT: superlinear filter voltage. Dedicated to MOTOROLA phones, it's a regulated power output that powers the VCO.

SIM: User ID.

SIMDAT: indicates SIM card data.

SIMCLK: indicates the SIM clock, which is 3.25MHz.

SIMPWR(SIMVCC) : SIM card power or SIM card power control.

SIMRST: The SIM card resets.

SIMDET: indicates SIM detection.

SLEEPCLK: Sleep clock. Common in Nokia mobile phones, if the signal is not normal, the phone can not be turned on.

SMOC: modem.

SOUND: Sounds.

SPEAKER: The receiver. See EAR.

SPI: external serial interface. MOTOROLA mobile phone circuit proprietary term.

SPICLK: serial interface clock.

SPIDAT: Serial interface data.

SPK: receiver, receiver. See EAR.

SRAM: static random access memory.

STDBY: Standby.

SW: switch.

SWDC: The voltage is not adjusted.

SW-RF: radio frequency switch.

SYN: synthesizer.

SYN2.8V: Frequency synthesizer 2.8V power supply.

SYNSTR: Frequency synthesizer starts.

SYNCLK: Frequency synthesis clock.

SYNDAT: Frequency synthesis data.

SYNEN: Frequency synthesis enabled.

SYNON: Frequency synthesis starts.

SYNTHPWR: Frequency synthesis power control.

TACS: all-access mobile communication system.

TCH: Voice channel.

TDMA: Time division multiple access. A multi-access technology that identifies users by time periods.

TEMP: indicates the battery temperature detection terminal.

TEST: test.

TP: test point.

TRX: Transceiver.

TX: Send a message.

TX-KEY-OUT: indicates the output of transmission timing control.

TXGSM: indicates the GSM signal output by TXVCO.

TXDCS: indicates the DCS signal output by the TXVCO.

TXC: signaling control.

TXIF: transmits intermediate frequency.

TXEN: Enable and enable transmission. When the signal is effective, the transmitter circuit begins to work.

TXVCO: Emission voltage controlled oscillator.

TXVCOOFF: Transmits the VCO start control signal.

TXI/Q: Send data.

TXON: Launch initiated. See TXEN

TXPWR: Transmit power control. See Nokia mobile phone.

TYPE: indicates the type.

UHFVCO: Radio frequency VCO, which is the same as RXVCO and RFVCO.

UNREGISTERED: unregistered.

UPDATE: indicates the update.

VBATT: Battery voltage.

VBOOST: Boost power supply.

VCC: Power supply.

VCCMIX: mixer power supply.

VCTCXO: temperature-compensated voltage controlled oscillator.

VCO: voltage controlled oscillator. This circuit converts the change of the control signal into the change of frequency and is the core device of the PLL.

VCXO: reference clock power supply. Some mobile phones are expressed by VXO.

VCXOPWR: 13MHz circuit power control. Nokia mobile phone proprietary term. The fault of the signal line will cause the phone to not turn on.

VDD: positive power input.

VEE: negative power input.

VHFVCO, generally used to denote the reception of a second vibro-controlled oscillator, functions similarly to IFVCO.

VIB-EN: Vibrator control.

VHFVCO: Used for receiving or transmitting intermediate frequency circuits of mobile phones.

VLIM: reference voltage for overvoltage protection.

VPP: indicates the peak value.

VREF: reference voltage.

VREG: Adjust the voltage.

VRX: receiver power supply. See Nokia mobile phone Circuit.

VSWITCH: indicates switching voltage.

VSYN: Frequency synthesis power supply.

VTX: Transmitter power supply, see Nokia mobile phone circuit.

VTCXO: Reference clock power supply.

WATCHDOG: watchdog.

WD-CP: Watchdog pulse.

WR: Write.

WRONGSOFTWARE: indicates a software fault.

XVCC: RF power supply.