Invention Grant
- Patent Title: Feedthrough capacitance compensation for resonant devices
- Patent Title (中): 谐振装置的馈通电容补偿
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Application No.: US12699732Application Date: 2010-02-03
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Publication No.: US08193869B1Publication Date: 2012-06-05
- Inventor: Andrew R. Brown , Wan-Thai Hsu , Kenneth R. Cioffi
- Applicant: Andrew R. Brown , Wan-Thai Hsu , Kenneth R. Cioffi
- Applicant Address: US CA San Jose
- Assignee: Discera, Inc.
- Current Assignee: Discera, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Lempia Summerfield Katz LLC
- Main IPC: H03B5/32
- IPC: H03B5/32

Abstract:
A device has a resonator coupled to input and output nodes, the resonator being characterized by a transducer to drive the output node, and further characterized by a feedthrough capacitance such that portions of the input signal bypass the transducer to allow a spurious signal to reach the output node. The device includes a compensation capacitor coupled to the output node to define a compensation capacitance in accordance with the feedthrough capacitance. A phase inversion circuit is coupled to the compensation capacitance to generate a compensation signal and coupled to the output node such that the spurious signal is offset by the compensation signal. In some cases, a differential amplifier of the phase inversion circuit has the compensation capacitance in a feedback path to offset the feedthrough capacitance. In these and other cases, the compensation capacitance and the feedthrough capacitance may be unmatched to avoid overcompensation.
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