发明授权
US5770976A Local clock duty cycle independent phase detector and method of
operation thereof
失效
本地时钟占空比独立相位检测器及其操作方法
- 专利标题: Local clock duty cycle independent phase detector and method of operation thereof
- 专利标题(中): 本地时钟占空比独立相位检测器及其操作方法
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申请号: US762021申请日: 1996-12-11
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公开(公告)号: US5770976A公开(公告)日: 1998-06-23
- 发明人: Krishnaswamy Nagaraj
- 申请人: Krishnaswamy Nagaraj
- 申请人地址: NJ Murray Hill
- 专利权人: Lucent Technologies Inc.
- 当前专利权人: Lucent Technologies Inc.
- 当前专利权人地址: NJ Murray Hill
- 主分类号: H03D13/00
- IPC分类号: H03D13/00 ; H03L7/089 ; H03L7/093
摘要:
A phase detector for a phase-locked loop ("PLL") circuit under control of a local oscillating clock ("LOSC") signal and a method of operation thereof. The phase detector includes: (1) a first circuit that receives a reference data ("REF") signal and the LOSC signal and develops therefrom an up pulse and a delayed data signal, (2) a second circuit, having an input coupled to an output of the first circuit, that receives the delayed data signal and the LOSC signal and develops therefrom at least one down pulse, a period of the at least one down pulse being substantially equal to a period of the LOSC signal and (3) a charge pump, having a predetermined up current setting and a predetermined down current setting, the predetermined down current setting being different from the up current setting to compensate for the period of the at least one down pulse, that receives the up pulse and the at least one down pulse and develops therefrom a voltage-controlled oscillator ("VCO") drive signal, the period of the at least one down pulse being substantially equal to the period of the LOSC signal to render the VCO drive signal less sensitive to variations in LOSC signal duty cycle.
公开/授权文献
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