Voltage controlled oscillator suitable for complete implementation within a semiconductor integrated circuit
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United States of America Patent
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Feb 16, 1993
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app pub date -
Mar 13, 1992
filing date -
Mar 13, 1992
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Abstract
An embodiment of the present invention is a voltage controlled oscillator (VCO) comprised of a differential pair of transistors that have respective positive feedback paths with phase-lead networks cross-coupled. Each positive feedback path on each side has two different phase-lead branches. The two phase-lead branches have the same phase differences on each side of the differential pair, in order to maintain a symmetry that improves common-mode noise rejection on a voltage control differential input. Current-steering is used to control the mixture of currents that arrive at the bases of the differential transistor pair from the respective two different phase-lead branches, and thereby changing the frequency of the VCO.
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