Chopper Phase Detector - Circuit Analysis

Gregory explains the working principles and makes a circuit analysis of a Chopper Phase Detector, from an HP 334A Distortion Analyzer.

The phase detector uses a differential amplifier and a single chopper transistor, chopping the incoming error signal, generating a DC level proportional to the phase difference.

The differential amplifier generates two out-of-phase signals that follow to the transistor chopper phase detector.

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00:44 - Introduction
02:06 - Wien Bridge
04:22 - Phase error - in phase and quadrature
05:20 - Wien Bridge tuning
05:58 - Phase detector
07:20 - Differential amplifier
08:20 - Chopper phase detection
11:40 - How the circuit works
12:40 - Waveform diagrams
14:38 - LTspice simulation

Reference:
https://www.pascalchour.fr/ressources...