Differential charge pump using surtchingly controlled current ge

Details Differential charge pump using surtchingly controlled current ge Differential charge pump using surtchingly controlled current ge

1995-12-21

1998-04-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327536, 363 60, H03L 706

Patent

active

057368805

ABSTRACT:
A differential charge pump circuit employing a lowpass filter network which is chargeable and dischargeable by switchingly controlled current generators. The differential charge pump employs two identical current generators for injecting the same current I in a substantially continuous manner, on the two significant nodes of the lowpass filter. The differential charge pump also employs two pairs of identical, switchingly controlled current generators connected to the two significant nodes, respectively, each capable of pulling a current I. The two generators forming each of the two pairs of switchingly controlled current generators are controlled by one of a pair of control signals (UP, DOWN) and by the inverted signal of the other of the pair of control signals, respectively. All four switchingly controlled generators may be of the same type (N-type), thus ensuring high speed and precision. The two identical (P-type) current generators employed for continuously injecting the same current I on the two nodes of the lowpass filter may be controlled through a common mode feedback loop for enhanced precision.

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IEEE Journal of Solid-State Circuits, vol. 29, No. 3, Mar. 1994 New York US, pp. 185-192, Barry Thompson et al. "A 300-MHZ BiCMOS Serial Data Transceiver".
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IBM Technical Disclosure Bulletin, vol. 22, No. 8A, Jan. 1980 New York US, pp. 3122-3123, O. R. Buhler et al "Charge Pump for Oscillator Control".
IBM Technical Disclosure Bulletin, vol. 33, No. 9, Feb. 1991 New York US, pp. 332-333, XP 0001009567 "Differential Charge Pump".

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