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This method reduces the Radio Frequency Interference (RFI) produced by CMOS Pierce crystal oscillators.
Motorola Inc. March 1990
English (United States)
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MOTOROLA Technical Developments Volume 10 March 1990
METHOD TO REDUCE RFI IN A CMOS PIERCE CRYSTAL OSCILLATOR
by Kenneth R. Burch
ABSTRACT: This method reduces the Radio Frequency Interference (RFI) produced by CMOS Pierce crystal oscillators.
The output signal waveform at the output of a CMOS Pierce crystal oscillator is often nearly "square". Thus the harmonic content is quite high. These undesired frequency components can cause interference in nearby radio circuits. The level of RFI can be reduced significantly by lowering the large signal loop gain by using a variation of the conven- tional CMOS Pierce circuit.