Theory of Operation
3-4 AFG3000 Series Arbitrary/Function Generators Service Manual
Generator Section
Generator with Amp Board
(A11/A12/A43)
Isolator: Transmit the serial control signal from the CPU board to the following
circuits with electrical insulation.
Clock Circuit: Generates a 1 GHz high-speed clock necessary for the signal
generation from a 10 MHz reference clock by PLL. This circuit has a function of
selecting the reference signal source as well.
GoC ASIC: GoC (Generator on Chip) ASIC is a CMOS waveform synthesis IC
which includes 2 GS/s DA, Direct Digital Synthesis, waveform SRAM 128 K, x8
MUX, Modulation, Burst and Sweep. So GoC manages most of the generator
section.
Tri gg er Circui t : Receives an External Trigger input signal, executes the level
conversion, then supplies the level converted trigger signal to the GoC ASIC.
Pre-Amplifier Circuit: Converts the differential output signal of the GoC to single
ended output, then supplies the single ended output to the Output Amplifier
through the Attenuator.
Output Amplifier: The output of the pre-amplifier is amplified and output. LPF is
used when a sine wave is output.
Trig Out Circuit: Sync Out signal from GoC ASIC is level converted to Trigger Out.
ADC: Modulation by an external source is performed by digitally sampling the
external input from the Ext Modulation Input connector.
Local Regulator: Supplies the necessary +1.8 V, +3.3 V, +15 V, and
–15 V power.
On/Off Relay: On/Off of the output signal.
Calibration Circuit: DC Calibration of the output signal is done by a 16 bit AD
Converter.
Generator with Amp Board
(A31/A32/A41/A42)
The A31/A32/A41/A42 boards are the same as the A11/A12 boards except they
have a different Output Amplifier board.
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