Apple inc. (20240348254). SYSTEMS AND METHODS FOR IMPROVED CHARGE PUMP PHASE-LOCKED LOOP PHASE STABILITY simplified abstract

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SYSTEMS AND METHODS FOR IMPROVED CHARGE PUMP PHASE-LOCKED LOOP PHASE STABILITY

Organization Name

apple inc.

Inventor(s)

Hongrui Wang of San Jose CA (US)

Abbas Komijani of Mountain View CA (US)

Hideya Oshima of Santa Clara CA (US)

Reetika K Agarwal of San Jose CA (US)

SYSTEMS AND METHODS FOR IMPROVED CHARGE PUMP PHASE-LOCKED LOOP PHASE STABILITY - A simplified explanation of the abstract

This abstract first appeared for US patent application 20240348254 titled 'SYSTEMS AND METHODS FOR IMPROVED CHARGE PUMP PHASE-LOCKED LOOP PHASE STABILITY

Simplified Explanation: The patent application discusses a method to address phase instability in a charge pump-based PLL circuit by compensating for output current variations that may be caused by low-frequency disturbances.

  • Replica charge pump and current filtering circuit implemented to provide error current compensation
  • Suppression of channel length modulation effect to improve phase stability
  • Reduction of phase noise in the VCO output

Key Features and Innovation:

  • Implementation of a replica charge pump and current filtering circuit
  • Compensation for output current variations caused by low-frequency disturbances
  • Suppression of channel length modulation effect to improve phase stability
  • Reduction of phase noise in the VCO output

Potential Applications:

  • Telecommunications
  • Wireless communication systems
  • Frequency synthesizers

Problems Solved:

  • Phase instability in a charge pump-based PLL circuit
  • Output current variations caused by low-frequency disturbances
  • Channel length modulation effect impacting phase stability

Benefits:

  • Improved phase stability
  • Reduced phase noise
  • Enhanced performance of VCO output

Commercial Applications: Commercial Applications of this technology could include:

  • Mobile devices
  • Satellite communication systems
  • Radio frequency transceivers

Prior Art: Prior art related to this technology may include research on charge pump-based PLL circuits, VCO phase instability, and methods to compensate for output current variations.

Frequently Updated Research: Researchers may be exploring new methods to further improve phase stability in charge pump-based PLL circuits, reduce phase noise, and enhance VCO performance.

Questions about Charge Pump-Based PLL Circuits: 1. How do low-frequency disturbances impact phase stability in PLL circuits? 2. What are the key components of a charge pump-based PLL circuit and how do they interact to generate stable output signals?


Original Abstract Submitted

in a charge pump-based pll circuit, charge pump output current variation may cause phase instability at an output of a vco. the output current variation may be caused by low-frequency disturbances (e.g., tuning voltage (vtune) drift with channel length modulation effect), disturbance in a gate bias voltage of a transistor, or a vdd transient. such a low-frequency disturbance may occur during initial lock, which may affect phase settling time, or after lock, which may result in phase instability. a replica charge pump and a current filtering and compensation circuit may be implemented at the output of a main charge pump to provide error current compensation to suppress channel length modulation effect, improve phase stability, and reduce phase noise.

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