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.

Support the channel becoming a Patron https://patreon.com/allelectronics

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/hp/334a/hp334a.pdf ... https://www.youtube.com/watch?v=1We8RUTj590