Self-starting charge pump based on current steering
By adopting a self-starting charge pump structure based on current steering in the charge pump, including current steering circuit, mirror bias circuit and soft start circuit, the shortcomings of the existing charge pump in terms of output current matching and stability are solved, and higher output current matching and stability are achieved. It is suitable for high-speed low-jitter phase-locking loop modules.
CN117155382BActive Publication Date: 2025-03-28WUXI ESIONTECH CO LTD
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Patent Information
- Application Number
- CN202311168807.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-11
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2043-09-11
AI Technical Summary
Technical Problem
The existing charge pumps have shortcomings in output current matching and stability, especially when powered on, which affects the actual application of the chip.
Method used
A self-starting charge pump structure based on current steering is adopted, including a current steering circuit, a mirror bias circuit and a soft start circuit. These circuits effectively suppress the influence of non-ideal factors and improve the matching and stability of the output current.
Benefits of technology
It achieves higher output current matching and stability, simplifies the structure, avoids the stability problems caused by additional operational amplifiers, and is suitable for high-speed, low-jitter phase-locked loop modules.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention relates to a self-starting charge pump based on current steering. It comprises: a current steering circuit, which is used to convert the phase difference signal between the clock signal up and the clock signal dn into a current signal and output it; a mirror bias circuit, which comprises a first bias voltage generating circuit and a second bias voltage generating circuit electrically connected to the first bias voltage generating circuit, wherein the first bias voltage generating circuit generates a bias voltage vbn based on a reference current ibg, and the second bias voltage generating circuit generates a bias voltage vbp based on a voltage Vout at an output end of the current steering circuit; when the current steering circuit is configured to enter a working state based on the bias voltage vbn and the bias voltage vbp, the first bias voltage generating circuit and the second bias voltage generating circuit are electrically connected to form a potential clamp of a node E to be consistent with the potential of the voltage Vout. The present invention effectively suppresses the influence of non-ideal factors and improves the matching and stability of the output current.
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