Charge-pump circuit intended for use in a frequency control loop

Details Charge-pump circuit intended for use in a frequency control loop Charge-pump circuit intended for use in a frequency control loop

1997-12-22

1999-11-16

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327482, H03L 706

Patent

active

059864877

ABSTRACT:
This circuit includes an output stage consisting of a current source SCE 52 and a current sink SNK 51 having an identical construction. A reference signal is applied to a D-type flipflop 40A and a local oscillator signal is applied to another flipflop 40B of the same type. The output 28 (27) of the flipflop 40A (40B) triggers a control circuit 30A (30B) whose output C-SCE (C-SNK) controls the current source SCE (SNK). The inputs of a logic gate 60 are connected to the control circuits 30A, 30B, and the gate supplies an inactive state reset signal to the flipflops 40A and 40B and the control circuits 30. Bias voltages which are common for the control circuits are generated by a circuit 20 which also fixes the elementary output current of the charge pump.

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patent: 5801578 (1998-09-01), Bereze
patent: 5825226 (1998-10-01), Ferraiolo

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