Invention Grant
- Patent Title: Overlapping, two-segment capacitor bank for VCO frequency tuning
- Patent Title (中): 重叠,两段电容器组用于VCO频率调谐
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Application No.: US12437462Application Date: 2009-05-07
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Publication No.: US08169270B2Publication Date: 2012-05-01
- Inventor: Yi Zeng , Tzu-wang Pan , I-Hsiang Lin
- Applicant: Yi Zeng , Tzu-wang Pan , I-Hsiang Lin
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent Kevin T. Cheatham
- Main IPC: H03B5/12
- IPC: H03B5/12

Abstract:
A VCO (for example, in an FM receiver) includes an LC resonant tank. The LC resonant tank includes a coarse tuning capacitor bank and a fine tuning capacitor bank. The coarse tuning capacitor bank contains a plurality of digitally controlled coarse tuning capacitor elements, each providing a first capacitance value when active. The fine tuning capacitor bank contains a plurality of digitally controlled fine tuning capacitor elements, each providing a second capacitance value when active. To address the practical problem of capacitor mismatch, capacitance overlap throughout the VCO tuning range is created by selecting the first and second capacitance values such that the capacitance value of the fine capacitor bank is greater than the first capacitance value when all of the digitally controlled fine tuning capacitor elements of the fine capacitor bank are active.
Public/Granted literature
- US20100283551A1 OVERLAPPING, TWO-SEGMENT CAPACITOR BANK FOR VCO FREQUENCY TUNING Public/Granted day:2010-11-11
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