AD630 Balanced Modulator Selected-Channel Operating Point

Application

This circuit presents the AD630 as a balanced modulator/demodulator with a selected A input path and a measured output operating point.

Design Context

The A input and its input-resistor pin are driven with a small 100 mV DC signal. SEL A is driven high, SEL B is grounded, and the B-side inputs are held at ground so the selected path is easy to inspect.

Expected Behavior

The operating-point table should show the output driven by the selected A-side input and the support pins held in defined states.

Suggested Experiments

• Change VA and VRA together to inspect output scaling.
• Swap SEL A and SEL B states to compare selected paths.
• Increase RLOAD to inspect a lighter output load.

Featured Component

AD630 Balanced Modulator/Demodulator is the featured analog modulator block. Its A/B input groups, select pins, and output/support pins are shown as separate functional regions.