Invention Grant
- Patent Title: Calibration circuit for VCO
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Application No.: US10303384Application Date: 2002-11-25
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Publication No.: US07120412B2Publication Date: 2006-10-10
- Inventor: Seema Butala Anand
- Applicant: Seema Butala Anand
- Applicant Address: US CA Irvine
- Assignee: Broadcom Corporation
- Current Assignee: Broadcom Corporation
- Current Assignee Address: US CA Irvine
- Agency: Garlick Harrison & Markison
- Agent James A. Harrison
- Main IPC: H04B1/06
- IPC: H04B1/06 ; H04B1/16

Abstract:
A phase-locked loop circuit includes an array of selectable capacitors formed within the phase-locked loop circuit to enable the phase-locked loop circuit to provide a degree of coarse frequency control by adding or removing capacitors and a degree of fine frequency control by sinking or sourcing current from a charge pump into a loop filter. A finite state machine is provided within a voltage controlled oscillator calibration circuit that communicates with an external baseband processor to initiate a calibration process, and further to determine how many capacitors of an array of capacitors if formed within the phase-locked loop circuit should be coupled to provide the coarse frequency control.
Public/Granted literature
- US20030224747A1 Calibration circuit for VCO Public/Granted day:2003-12-04
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