Invention Grant
US07956695B1 High-frequency low-gain ring VCO for clock-data recovery in high-speed serial interface of a programmable logic device
有权
用于在可编程逻辑器件的高速串行接口中进行时钟数据恢复的高频低增益环形VCO
- Patent Title: High-frequency low-gain ring VCO for clock-data recovery in high-speed serial interface of a programmable logic device
- Patent Title (中): 用于在可编程逻辑器件的高速串行接口中进行时钟数据恢复的高频低增益环形VCO
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Application No.: US12729356Application Date: 2010-03-23
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Publication No.: US07956695B1Publication Date: 2011-06-07
- Inventor: Weiqi Ding , Mengchi Liu
- Applicant: Weiqi Ding , Mengchi Liu
- Applicant Address: US CA San Jose
- Assignee: Altera Corporation
- Current Assignee: Altera Corporation
- Current Assignee Address: US CA San Jose
- Agency: Ropes & Gray LLP
- Agent Jeffrey H. Ingerman
- Main IPC: H03B5/12
- IPC: H03B5/12
Abstract:
A voltage-controlled oscillator operates at high frequency without high gain by dividing the frequency range into a plurality of subranges, which preferably are substantially equal in size. Within any subrange, the full extent of variation in the control signal changes the frequency only by the extent of the subrange. The gain is thus substantially equal to the gain one would expect for the full frequency range, divided by the number of subranges. The subrange may be selected manually, or by an initial calibration process. In one embodiment, the oscillator includes a voltage-to-current converter and a current-controlled oscillator, with a current mirror arrangement. In that embodiment, selection of the subrange may be controlled by turning on the correct number of current legs.
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