Self-oscillating mixer circuits and methods therefor
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United States of America Patent
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Nov 7, 1995
Issued Date -
N/A
app pub date -
Jan 13, 1994
filing date -
Apr 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Self-oscillating mixer circuits for use in communications systems. The circuits comprise a push-pull amplifier for amplifying a signal having a first frequency to produce an amplified signal, a feedback loop coupled to the push-pull amplifier for phase shifting the amplified signal during each half cycle of the push-pull amplifier, thereby creating an oscillating output signal, and a mixing element for coupling the oscillating output signal to the signal having the first frequency, thereby mixing the signal having the first frequency with the oscillating signal to produce a signal having a second frequency. The circuits described herein have transistors that operate near the class B mode to obtain optimal frequency conversion with minimal power consumption. These circuits will therefore find use in any communications-type system which requires a frequency converter.
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