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Figure 9-2. AFG Simplified Block Diagram
Memory
The memory consists of four areas of RAM in which the AFG stores the
DAC codes. Concurrently with the DAC, the frequency generator also
clocks a latch to output the next code in the RAM to set the DAC bits to the
next point on the waveform.
The standard waveform DAC codes are stored in EPROMs. To output a
standard waveform, the codes in the EPROMs are transferred to the RAM.
For user generated arbitrary waveforms, the DAC codes are directly stored
into the RAMs. The same operation then takes place as stated above.
Reference Oscillator
The reference oscillator provides the clock signal for the frequency
generator. Thus, frequency stability depends on the stability of the reference
oscillator. The AFG allows for user supplied reference oscillator sources
for custom frequency values. The reference oscillator also clocks the RAM
and the DAC.
Frequency
The frequency generator sets the waveform frequency by determining the
speed at which the RAM address is addressed.
Generators
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HP E1340A Block Diagram Description
Chapter 9
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