Invention Grant
- Patent Title: High frequency synthesis and duty cycle control with interpolative dividers using a low speed interface
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Application No.: US15385311Application Date: 2016-12-20
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Publication No.: US10270457B2Publication Date: 2019-04-23
- Inventor: Vivek Sarda
- Applicant: Silicon Laboratories Inc.
- Applicant Address: US TX Austin
- Assignee: Silicon Laboratories Inc.
- Current Assignee: Silicon Laboratories Inc.
- Current Assignee Address: US TX Austin
- Agency: Zagorin Cave LLP
- Main IPC: H03B21/00
- IPC: H03B21/00 ; H03L7/197

Abstract:
An interpolative divider includes a look ahead sigma delta modulator circuit to generate divide values according to a divide ratio. A plurality of M storage elements are coupled to the sigma delta modulator to store the divide values, M being at least 2. A selector circuit selects the respective divide values and supplies the divide values to a portion of an interpolative divider circuit, the portion including a divider and a phase interpolator. The interpolative divider generates an output clock signal having a first clock period that may be determined by the first and second divide values. The M storage elements are loaded by a clock signal that is slower than the output clock signal by at least half.
Public/Granted literature
- US20180175871A1 HIGH FREQUENCY SYNTHESIS AND DUTY CYCLE CONTROL WITH INTERPOLATIVE DIVIDERS USING A LOW SPEED INTERFACE Public/Granted day:2018-06-21
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