Multi-frequency signal generator

Published:2011/7/28 3:22:00 Author:Ecco | Keyword: Multi-frequency , signal generator | From:SeekIC

The chart shows the multi-frequency signal generator. SJT and VTl form a crystal oscillator. SJT is used as a quartz crystal equivalent inductance, the equivalent Q value is high, the other components and stray parameters have minimal effect on the oscillation frequency, so the frequency stability is high. VT2, etc. constitute a source follower to get low output impedance and an dampening effect to avoid the load to affect the crystal stability. In order to obtain more frequency signs to calibrate the receiver, it can use a square wave circuit shown as below. This circuit can instead of the the C3 in above figure, and be connected between the source of VT1 and grid of VT2, then it will generate rich harmonic signals (such as the l00kHz crystal can produce 30MHz harmonic signals). It can be used as frequency sign for calibrating general high frequency receiver.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Signal_Processing/Multi_frequency_signal_generator.html

Print this Page | Comments | Reading(3)