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