Invention Grant
- Patent Title: Apparatus and method for generating quadrupled reference clock from single ended crystal oscillator
- Patent Title (中): 从单端晶体振荡器产生四倍参考时钟的装置和方法
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Application No.: US14640672Application Date: 2015-03-06
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Publication No.: US09490784B2Publication Date: 2016-11-08
- Inventor: Mohammad Bagher Vahid Far , Alireza Khalili , Yashar Rajavi , Amirpouya Kavousian
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Arent Fox LLP
- Main IPC: H03B19/14
- IPC: H03B19/14 ; H03K5/156 ; H03K5/00 ; H03B19/10

Abstract:
A method, an apparatus, and a computer program product are provided. The apparatus outputs a sinusoidal signal according to a first clock frequency, generates, a first digital signal having a 25% duty cycle based on the sinusoidal signal, generates a second digital signal having a 25% duty cycle based on the sinusoidal signal, combines the first digital signal and the second digital signal to generate a combined digital signal having a 50% duty cycle and a second clock frequency that is double the first clock frequency, and doubles the second clock frequency of the combined digital signal to generate an output signal having a third clock frequency that is quadruple the first clock frequency. The apparatus further generates a first control voltage and a second control voltage for the first buffer and a third control voltage for the second buffer based on the output signal.
Public/Granted literature
- US20160164507A1 APPARATUS AND METHOD FOR GENERATING QUADRUPLED REFERENCE CLOCK FROM SINGLE-ENDED CRYSTAL OSCILLATOR Public/Granted day:2016-06-09
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