Biasing circuit for setting bias voltages of current source circuit and current sink circuit in charge pump of phase-locked loop circuit by using current digital-to-analog converter and low-pass filter

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United States of America

PATENT NO 12255659
APP PUB NO 20230387919A1
SERIAL NO

17751675

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Abstract

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A charge pump of a phase-locked loop (PLL) circuit includes a current source circuit, a current sink circuit, and a biasing circuit. The biasing circuit includes a current digital-to-analog converter (IDAC) and a low-pass filter (LPF). The IDAC provides a reference current in response to a current value setting, wherein a first voltage is established due to the reference current. The LPF applies low-pass filtering to the first voltage to generate a filter output as a second voltage, wherein bias voltages of the current source circuit and the current sink circuit are controlled by the second voltage.

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Patent Owner(s)

  • AIROHA TECHNOLOGY CORP.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lin, Heng-Chih Hsinchu, TW 53 758
Lin, Shu-Yu New Taipei, TW 27 89

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