Phase-locked loops having two amplifiers for driving a vco

Details Phase-locked loops having two amplifiers for driving a vco Phase-locked loops having two amplifiers for driving a vco

1997-03-31

1999-02-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 331 25, H03L 7093

Patent

active

058748628

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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Technique Eases Design of Phase-Locked Loops, EDN Electrical Design News., vol. 35, No. 17, Aug. 20, 1990, Newton, Massachusetts, pp. 141-149.

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