LOW_FREQUENCY_CRYSTAL_OSCILLATOR

Published:2009/6/15 20:55:00 Author:May | From:SeekIC

Q1, Q2, and the associated circuitry form a modified astable multivibrator in which the loop gain is automatically adjusted to the threshold of oscillation by means of field effect transistor Q3. Q4 lin-early amplifies the signal present at the collector of Q2 and isolates the oscillator section of the cir-cuit from the output. This stage features wideband operation and delivers a clean 2.5-V amplitude sine wave into a resistive load greater than or equal to 20 kΩ. The stage comprising Q5 has a voltage gain of 1 and its sole purpose is to isolate the nonlinear effects of rectifier Dl from the output.



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