Charge pump circuit and method

Details Charge pump circuit and method Charge pump circuit and method

1997-06-30

1998-10-20

Hecker, Stuart N.

Electric power conversion systems

Current conversion

With voltage multiplication means

327157, 331 17, H02M 318, H03L 706

Patent

active

058256407

ABSTRACT:
A circuit and method produce a pump current (I.sub.p) at the output (31) of a charge pump (26). A switching transistor (32, 35) is coupled at a node (38, 39) to a current source transistor (33, 34) to produce the pump current at a specified magnitude in response to an input pulse (V.sub.PU, V.sub.PD). A charge is stored on a parasitic capacitance of the node. A charge conduction path (42, 43) is coupled to the node and enabled on one transition edge of the input pulse to alter the charge by routing to a discharge node (45) to reduce charge flowing to the output as an error current. The charge conduction path is disabled on the other transition edge of the input pulse to isolate the node from the output.

REFERENCES:
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patent: 5473283 (1995-12-01), Luich
patent: 5576647 (1996-11-01), Sutardja et al.
patent: 5592113 (1997-01-01), Quiet et al.
patent: 5646563 (1997-07-01), Kuo
D. Mijuskovic et al., "Cell-Based Fully Integrated CMOS Frequnecy Synthesizers", IEEE Journal of Solid-State Circuits, Mar. 3, 1994, vol. 29, No. 3, pp. 271-278.
Floyd M. Gardner, "Charge-Pump Phase-Lock Loops", IEEE Transactions on Communications, vol. COM-28, No. 11, Nov. 1980, pp. 321-330.

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