Invention Grant
- Patent Title: Phase lock loop (PLL) with gain control
- Patent Title (中): 具有增益控制的锁相环(PLL)
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Application No.: US12127651Application Date: 2008-05-27
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Publication No.: US07786771B2Publication Date: 2010-08-31
- Inventor: Tsung-Hsien Tsai , Tsung-Yang Hung , Chien-Hung Chen , Min-Shueh Yuan
- Applicant: Tsung-Hsien Tsai , Tsung-Yang Hung , Chien-Hung Chen , Min-Shueh Yuan
- Applicant Address: TW Hsin-Chu
- Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
- Current Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
- Current Assignee Address: TW Hsin-Chu
- Agency: Slater & Matsil, L.L.P.
- Main IPC: H03L7/06
- IPC: H03L7/06

Abstract:
A Phase Lock Loop (PLL) with gain control is provided. The PLL has a dual-path configuration, where a first and a second VCO control voltage are generated in response to a phase or frequency difference between a PLL input signal and an output signal. The PLL comprises a dynamic voltage gain control (DVGC) unit and a voltage-to-current (V2I) unit, where the DVGC creates a baseline reference current in response to the first VCO control voltage and the V2I provides a substantially linear current in response to the second VCO control voltage. The currents from the DVGC and V2I are combined and fed into a current-controlled oscillator, which generates a PLL output frequency signal. Frequency gain of the VCO is substantially reduced, thus providing a PLL with improved tuning precision.
Public/Granted literature
- US20090295439A1 Phase Lock Loop (PLL) with Gain Control Public/Granted day:2009-12-03
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