Invention Grant
- Patent Title: Switched capacitor circuit for a voltage controlled oscillator
- Patent Title (中): 用于压控振荡器的开关电容器电路
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Application No.: US12769046Application Date: 2010-04-28
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Publication No.: US08193868B2Publication Date: 2012-06-05
- Inventor: Vishal P. Trivedi
- Applicant: Vishal P. Trivedi
- Applicant Address: US TX Austin
- Assignee: Freescale Semiconductor, Inc.
- Current Assignee: Freescale Semiconductor, Inc.
- Current Assignee Address: US TX Austin
- Agent Ranjeev Singh; Jonathan N. Geld
- Main IPC: H03B5/12
- IPC: H03B5/12 ; H03C3/22 ; H01P1/15

Abstract:
A switched capacitor circuit for use at at least one operating frequency is provided. The switched capacitor may include an inductive element having a first terminal coupled to a switching voltage and a second terminal. The switched capacitor circuit may further include a hetero-junction bipolar transistor (HBT) having a base terminal coupled to the second terminal of the inductive element, a first conducting terminal, and a second conducting terminal coupled to a voltage supply terminal. The switched capacitor circuit may further include a capacitor having a first terminal coupled to the first conducting terminal of the HBT and a second terminal coupled to a node, wherein a capacitance value at the node is a function of the switching voltage, and wherein the inductive element is configured such that a combined impedance of an impedance of the capacitor, an impedance of the HBT, and an impedance of inductive element resonates at the at least one operating frequency only when the HBT is substantially non-conducting.
Public/Granted literature
- US20110267149A1 SWITCHED CAPACITOR CIRCUIT FOR A VOLTAGE CONTROLLED OSCILLATOR Public/Granted day:2011-11-03
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