Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1997-09-03
1999-07-27
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327148, 327156, 327105, 327537, 327536, 331 17, 331 25, H03L 5093, H03K 1700
Patent
active
059296780
ABSTRACT:
A charge pump (CP) is provides for supplying at its output (23) a first current in response to an up-pulse and sinking a second current in response to a down pulse. This charge pump includes a first circuit 200, 22, CM1) for converting the first control signal into the first current, and a second circuit (206, 208, CM2) for converting the second control signal into the second current, said the first and second circuits include circuitry means comprising means (CM1, CM2) for filtering the respective control signals. It is recognized that a charge pump does not have to supply or sink current pulses which are rectangularly shaped in order for it to properly carry out its function. In the subject charge pump invention, the current sources supply or sink current pulses are smoothly shaped because the control signals supplied to the current sources are filtered. This causes the demands on the high frequency performance of the current sources to be greatly reduced. Consequently, relatively slow current sources may be used without the performance of the charge pump being limited by these slow current sources.
REFERENCES:
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 5493250 (1996-02-01), Kasperkovitz et al.
patent: 5610954 (1997-03-01), Miyashita et al.
SP24.5 by Akbar Ali and Joo Leong Tham, entitled "A 900 MHz Frequency synthesizer with integrated LC voltage-controlled oscillator", 1996 IEEE International Solid-State Circuits Conference, pp. 390-391.
Kasperkovitz Wolfdietrich G.
Vaucher Cicero S.
Goodman Edward W.
Le Dinh
U.S. Philips Corporation
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