CRYSTAL_CONTROLLED_SIGNAL_SOURCE

Published:2009/7/1 3:18:00 Author:May | From:SeekIC

This general purpose signal source serves very well in signal-tracing applications.The output level is variable to more than 1 Vrms into a 50 Ω load. Almost any crystal in the 1 to 15 MHz range can be used. Q1 forms a Colpitts oscillator with the output taken from the emitter. A capacitive voltage divider (across the 2.2 K emitter resistor) reduces the voltage applied to the buffer amplifier, Q2. The buffer and emitter follower, provides the low input impedance necessary to drive 50 Ω loads.



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