Phase-locked loops having two amplifiers for driving a vco
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United States of America Patent
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Feb 23, 1999
Grant Date -
N/A
app pub date -
Mar 31, 1997
filing date -
Apr 25, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A phase-locked loop employing a charge pump 7 for synthesizing RF channels permits a low supply voltage to be used by using two amplifier stages 5a, 5b, between the charge pump and a VCO4. Stage 5a may be a high impedance common emitter pair of complementary transistors allowing a wide voltage swing. Stage 5b may be an operational amplifier with resistive feedback to provide gain less than unity and a low impedance output to provide feedback around a loop filter 6 to source the current from charge pump 7 entering an inverting input of stage 5a. Alternatively, stages 5a, 5b may be reversed.
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