Invention Grant
- Patent Title: Digital phase-locked loop with two-point modulation using an accumulator and a phase-to-digital converter
- Patent Title (中): 数字锁相环采用累加器和相数转换器进行两点调制
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Application No.: US12432468Application Date: 2009-04-29
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Publication No.: US08076960B2Publication Date: 2011-12-13
- Inventor: Jifeng Geng , Gary J. Ballantyne , Daniel F. Filipovic
- Applicant: Jifeng Geng , Gary J. Ballantyne , Daniel F. Filipovic
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent Jiayu Xu
- Main IPC: H03L7/06
- IPC: H03L7/06

Abstract:
A digital phase-locked loop (DPLL) supporting two-point modulation is described. In one design, the DPLL includes a phase-to-digital converter and a loop filter operating in a loop, a first processing unit for a lowpass modulation path, and a second processing unit for a highpass modulation path. The first processing unit receives an input modulating signal and provides a first modulating signal to a first point inside the loop after the phase-to-digital converter and prior to the loop filter. The second processing unit receives the input modulating signal and provides a second modulating signal to a second point inside the loop after the loop filter. The first processing unit may include an accumulator that accumulates the input modulating signal to convert frequency to phase. The second processing unit may include a scaling unit that scales the input modulating signal with a variable gain.
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