Variable phase shifting circuit manufactured in simple integrated circuit
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United States of America Patent
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-
Jan 23, 2001
Grant Date -
N/A
app pub date -
Dec 10, 1998
filing date -
Dec 25, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable phase shifting circuit includes a resistance unit and a variable capacitance unit. The resistance unit includes at least one resistor element. The resistance unit input a first signal and a second signal and also output a third signal and a fourth signal. The variable capacitance unit includes two base-to-emitter capacitors of two transistors. The variable capacitance unit is connected to the third signal and the fourth signal. The two base-to-emitter capacitors is varied by controlling collector currents of the two transistors. The third signal and the fourth signal are produced by shifting phases of the first and second signals based on the at least one resistor element and the two base-to-emitter capacitors.
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