Differential charge pump

Details Differential charge pump Differential charge pump

2002-12-19

2004-02-03

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S536000

Reexamination Certificate

active

06686794

ABSTRACT:

BACKGROUND
Charge pump circuits are used to source current to or sink current from a load in response to control signals. Typically, these control signals consist of an UP signal and a DOWN signal. Current is sourced to the load in a case that the UP signal is active and the DOWN signal is inactive, and current is sunk from the load in a case that the UP signal is inactive and the DOWN signal is active. Ideally, no current flows through the load if both control signals are in the same state.
In a non-ideal charge pump, some current flows to or from the load if both control signals are in the same state. This current is known as leakage current. A charge pump is often designed in view of a maximum allowable leakage current specified by applicable charge pump design specifications.
Leakage current affects the output swing of a charge pump. More particularly, output swing is defined as the maximum swing at the output of a charge pump which results in a leakage current that is less than the specified maximum allowable leakage current. Some applications require charge pumps having one or more of a high output swing, a high output impedance, a stable common-mode output, and low voltage headroom requirements.


REFERENCES:
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patent: 6385265 (2002-05-01), Duffy et al.
Juárez-Hernández, Esdra et al., “A Novel CMOS Charge-Pump Circuit with Positive Feedback for PLL Applications”, Instituto Techológico de Chihuahua, Electro 2001. p. 283-286.*
St. Pierre, Robert, “Low-Power BiCMOS Op-Amp with Integrated Current-Mode Charge Pump”, IEEE Journal of Solid-State Circuits, vol. 35, No. 7, Jul. 2000, 0018-9200. p. 1046-2050.*
Lin, Li et al., “TP 12.5: A 1.4GHz Differential Low-Noise CMOS Frequency Synthesizer using a Wideband PLL Architecture” 3pgs.*
“Properties of the Charge-Pump Voltage Splitter”, Dec. 7 2000, ©2002 Maxim Integrated Products, download from http://www.maxim-ic.com/appnotes.cfm/appnote_number/718 on Oct. 30, 2002. 5 pgs.

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