Canon PowerShot G2, Service Manual, Page: 147 / 155

5-2-7. Abbreviation in Block Diagrams
Abbreviation Nominal name Description
ADC Analog-to-Digital (A/D) Converter
AE Automatic Exposure control
AF Automatic Focussing control
AND Logic AND circuit
R-Y/B-Y Color difference signals of TV system
BPF Band-Pass Filter
BUFFER Buffer circuit
C Chrominance signal Color component signal of TV system
CCD Charge-Coupled Device CCD imager
CDS Correlated Double Sampling system
COMP.VIDEO Composite video signal
COMPARATOR Voltage comparator
CPU Central Processing Unit
DAC Digital-to-Analog (D/A) Converter
DRAM Dynamic Random Access Memory Memory with which read and write are freely possible.
DSP Digital Signal Processing Typically DSP device
EEPROM Electrically Erasable PROM PROM that is electrically erasable.
EVF Electronic View Finder
FET Field Effect Transistor
FLASH MEMORY Non-volatile memory with which write and read are freely
possible.
HPF High-Pass Filter
I/F InterFace The circuit that interconnects 2 devices or circuits.
IGBT Insulated Gate Bipolar Transistor Conductivity-modulation type FET transistor
INV. Logic Inverter circuit
IR InfraRed ray
IRIS Iris
LCD Liquid Crystal Device Typically LCD display
LED Light Emitting Diode Typically LED display
LPF Low-Pass Filter
NTSC National Television System Committees NTSC color TV system developed in USA
OP Amp OPerational Amplifier
OR Logic OR circuit
OSC OSCillator
PAL Phase Alternating by Line PAL color TV system developed in Germany
PLL Phase Locked Loop
PROM Programmable Read Only Memory Non-volatile memory in which program can be written.
PWM Pulse Width Modulation
REG. REGulated power supply
RTC Real Time Clock Reference clock oscillator
SDRAM Synchronous Dynamic RAM DRAM whose bus interface is synchronous.
SECAM SEquential Colour À Mémoire SECAM color TV system developed in France
SW REG SWitching REGulator Switching type regulated power supply device
TG Timing Generator
USB Universal Serial Bus USB type serial data communication system
VCO Voltage Controlled Oscillator
VCXO Voltage Controlled X’tal Oscillator
XE Xenon Tube
Y Y-signal Luminance component signal of TV system