WF1946B 1-3
1.2 Operating principles
Block diagram
Sweep
input/output
Display and panel key
Isolation
occurrence
Others
Digital output
Overlevel
Detector
Amplitude control
Clock
Synchronous operation
input/output
Offset D/A
Multiplier
Multiplier
z
The CPU conducts analog control for display, panel keys, remote control (GPIB, USB), DDS,
amplitude and DC offset. Sweep input/output is also controlled for sweep internal/external
modulation.
z The clock generator produces DDS reference and CPU clock signals.
z Two sets of circuits for DDS and analog compose two channels.
z An isolation circuit between the CPU and DDS provides floating functions.
z The DDS (Direct Digital Synthesizer) uses an original LSI device and generates digital data of
the setting frequency.
z The waveform memory converts digital data from the DDS into standard or arbitrary waveform
data. Waveform data are set from the CPU.
z The digital to analog (D/A) converter produces an analog signal from the resulting waveform
data.
z The lowpass filter (LPF) smoothes the stepped D/A output signal.
z Amplitude control is set by the gain control. DC offset is produced by the offset D/A converter
and the output amplifier adds and amplifies the output signal.
z The attenuator (ATT) selects the output range by 1/10 attenuation on/off.
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