Invention Grant
- Patent Title: Multiplying delay locked loops with compensation for realignment error
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Application No.: US15966368Application Date: 2018-04-30
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Publication No.: US10340902B1Publication Date: 2019-07-02
- Inventor: Justin L. Fortier , Rachel Katumba
- Applicant: Analog Devices Global Unlimited Company
- Applicant Address: BM Hamilton
- Assignee: Analog Devices Global Unlimited Company
- Current Assignee: Analog Devices Global Unlimited Company
- Current Assignee Address: BM Hamilton
- Agency: Knobbe Martens Olson & Bear LLP
- Main IPC: H03L7/06
- IPC: H03L7/06 ; H03K5/00 ; H03L7/24 ; H03L7/099

Abstract:
Multiplying delay locked loops (MDLLs) with compensation for realignment error are provided. In certain implementations, an MDLL includes a control circuit, a multiplexed oscillator, and an integrate and subtract circuit. The control circuit selectively injects a reference clock signal into the multiplexed oscillator, which operates with an injected period when the reference clock signal is injected and with a natural period when the reference clock signal is not injected. The integrate and subtract circuit receives an oscillator signal from the multiplexed oscillator, and tunes an oscillation frequency of the multiplexed oscillator based on a difference between an integration of the oscillator signal over the injected period and an integration of the oscillator signal over the natural period.
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