E C T O R Ratio Detector Section - Agilent Technologies 4284A Service Manual

3-9-5. VECTOR RATIO DETECTOR SECTION
The vector ratio detector is the A6 board, and it consists of the phase sensitive detector, the
detection phase generator, and the A-D (Analog-to-digital) converter.
The phase sensitive detector detects the ERR voltage and the EDUT voltage using 0 ° and
90° reference signals from the detection phase generator, and outputs the 0° components
of the ERR and EDUT voltages and the 90° components of the ERR and EDUT voltages.
The A-D converter coverts each 0° and 90° components to digital signals. After that, each
parameter's value is calculated by using these digital values.
EDUT
ERR - > - - - o
DETECTION
PHASE GENERATOR
Figure 3-10. Vector Ratio Detector
3-30
MULTI-SLOPE
A-D CONVERTER
00+
90°+D