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Patent Searching and Data


Title:
PLL CIRCUIT AND CONTROL METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2021/112000
Kind Code:
A1
Abstract:
A DCO 200 is configured such that while a selection signal SEL is asserted, a ring oscillator is formed and the DCO 200 oscillates at a frequency according to a control code DCO_CODE, and while the selection signal SEL is negated, the DCO 200 can inject an injection edge INJ_EDGE based on a reference clock CLK_REF. In a startup period of a PLL circuit 100, a controller 500 repeats a cycle including (i) a process for asserting the selection signal SEL, oscillating the DCO 200, and comparing the phases of an oscillator clock and the reference clock CLK_REF, and (ii) a process for negating the selection signal, stopping the DCO 200, and updating the control code through a binary search based on the result of the phase comparison.

Inventors:
TSUJI MASANOBU (JP)
Application Number:
PCT/JP2020/044205
Publication Date:
June 10, 2021
Filing Date:
November 27, 2020
Export Citation:
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Assignee:
ROHM CO LTD (JP)
International Classes:
H03L7/083; H03L7/099; H03L7/10; H03L7/24
Foreign References:
JP2008005141A2008-01-10
JP2011130047A2011-06-30
JP2012227779A2012-11-15
JP2017143398A2017-08-17
Attorney, Agent or Firm:
MORISHITA Sakaki (JP)
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