RF_PROBE_1

Published:2009/7/9 20:57:00 Author:May | From:SeekIC

Transistor Q1-conftgured as a source-follower buffer stage, offering a bit under unity voltage gain-gives the unit a high-impedance input of about 1 MΩ shunted by about 10 pF, which keeps only minimal loading on the equipment being tested. C1 serves as input dc blocking capacitor. The Q1 output is coupled by C2 to a simple AM detector circuit made up of D1, D2, R3 and C3. Capacitor C4 provides output dc blocking. Total current consumption should be somewhere around 1 mA. The circuit responds to frequencies from 100 kHz to well over 50 MHz.



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