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US 6,636,083 B1Granted
Leakage current cancellation technique for low power switched-capacitor circuits
AssigneePacesetter, Inc.
InventorsLouis Wong, Shohan Hossain, Andre Walker
Life of this patent
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Abstract
An active feedback loop is provided in a switched-capacitor circuit to automatically cancel both junction and sub-Vth channel leakage. Low power consumption that is crucial for implantable medical devices is achieved. The circuit technique largely minimizes the effective leakage current when the switch is turned off. This circuit technique of the invention can be used in many different circuit applications.
Claims10
Apparatus for reducing leakage current in a low power switched capacitor circuit, comprising:
- a first low power solid state switch including a hold capacitor;
- a second low power solid state switch, including a replica capacitor, coupled to said first solid state switch, said replica capacitor having a smaller capacitance than said hold capacitor;
- and
- a self adjusted current source coupled to said first and second solid state switches, for generating a current that is substantially equal to and opposite from a leakage current generated by said first solid state switch.
1 more element
Apparatus for reducing leakage current in a low power switched capacitor circuit, comprising:
- a low power solid state switch circuit, wherein, in an OFF state, said solid state switch circuit generates a leakage current;
- and
- a self adjusted current source coupled to said solid state switch circuit, for generating a counter current that is substantially equal to and opposite from the leakage current generated by said solid state switch circuit,
- wherein said solid state switch circuit comprises:
- a first low power solid state switch, wherein in an OFF state, said first solid state switch generates a first leakage current;
- a second low power solid state switch, wherein in an OFF state, said second solid state switch generates a second leakage current;
- means for measuring a voltage difference between said first and second solid state switches as a function of said first and second leakage currents;
- and
- means for providing said counter current to said first and second solid state switches as a function of the measured voltage difference.
6 more elements
Dependencies are inferred from the claim text.