Invention Application
US20170033740A1 LOW VOLTAGE CRYSTAL OSCILLATOR (XTAL) DRIVER WITH FEEDBACK CONTROLLED DUTY CYCLING FOR ULTRA LOW POWER
审中-公开
低电压晶体振荡器（XTAL）驱动器，具有反馈控制的超低功耗循环
- Patent Title: LOW VOLTAGE CRYSTAL OSCILLATOR (XTAL) DRIVER WITH FEEDBACK CONTROLLED DUTY CYCLING FOR ULTRA LOW POWER
- Patent Title (中): 低电压晶体振荡器（XTAL）驱动器，具有反馈控制的超低功耗循环
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Application No.: US15161521Application Date: 2016-05-23
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Publication No.: US20170033740A1Publication Date: 2017-02-02
- Inventor: Benton H. Calhoun , Aatmesh Shrivastava
- Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION
- Applicant Address: US VA Charlottesville
- Assignee: UNIVERSITY OF VIRGINIA PATENT FOUNDATION
- Current Assignee: UNIVERSITY OF VIRGINIA PATENT FOUNDATION
- Current Assignee Address: US VA Charlottesville
- Main IPC: H03B5/36
- IPC: H03B5/36
Abstract:
A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The amplifier of a XTAL oscillator can be duty cycled to save power, e.g., the XTAL driver can be turned off to save power when the amplitude of the XTAL oscillation reaches a maximum value in range; but be turned back on when the amplitude of the XTAL oscillation starts to decay, to maintain the oscillation before it stops. In addition or alternatively, a feedback control scheme to duty cycle the amplifier of a XTAL oscillator can be used to monitor the amplitude of the oscillation.
Public/Granted literature
- US09979348B2 Low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power Public/Granted day:2018-05-22
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