Adaptive Charge Pump Oscillator for PVT Frequency Compensation
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Solution Overview
Problem
Pump oscillators in charge pumps are susceptible to process, voltage, and temperature (PVT) changes, leading to inefficiencies and drivability issues at varying conditions, with existing process-dependent tuning failing to compensate for dynamic voltage and temperature variations.
Innovation Solution
Implementing an adaptive reverse supply voltage and adaptive inverse temperature-dependent frequency generator to stabilize frequency and improve efficiency across different voltage and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If process-dependent tuning is used to compensate for process changes, then manufacturing precision is improved, but adaptability to voltage and temperature changes deteriorates
Solution Approach 1:
The patent implements dynamic frequency tuning by making the oscillator frequency adaptive to voltage and temperature changes. The system continuously adjusts the frequency based on real-time PVT conditions rather than using fixed process-dependent tuning, allowing the charge pump to maintain optimal performance across varying operating conditions.
Solution Approach 2:
The patent changes the operating parameters of the oscillator by introducing voltage and temperature dependent frequency adjustment mechanisms. This involves modifying the oscillator frequency parameter dynamically based on sensed PVT conditions, enabling the system to adapt to different operating environments while maintaining manufacturing precision.
2Ease of manufacture
If RC ring oscillator is used with positive frequency-voltage dependency, then ease of manufacture is improved, but drivability at low voltage deteriorates
Solution Approach 1:
The patent makes the oscillator frequency dynamically adjustable to compensate for voltage variations. By implementing adaptive frequency control, the system maintains adequate drivability across the voltage range while preserving the manufacturing simplicity of RC ring oscillator structures.
Solution Approach 2:
The patent introduces feedback mechanisms that sense voltage and temperature conditions and adjust the oscillator frequency accordingly. This feedback loop ensures that the oscillator maintains proper drivability characteristics across different operating conditions while keeping the basic RC ring structure simple to manufacture.
3Ease of manufacture
If RC ring oscillator is used with positive frequency-voltage dependency, then ease of manufacture is improved, but power efficiency at high voltage deteriorates
Solution Approach 1:
The patent changes the frequency parameter of the oscillator dynamically based on voltage and temperature conditions. By reducing the frequency at high voltage and temperature, the system improves power efficiency while maintaining the manufacturing simplicity of the RC ring oscillator structure.
Data Source
AI summary
A memory device includes memory cells configured to store data and a charge pump. The charge pump includes a ring oscillator having an inverter and compensation circuitry configured to compensate for voltage and temperature changes for the charge pump. The compensation circuitry includes a first current source configured to selectively slow charging of a gate of the inverter during a charging phase and to selectively enhance discharging of the gate of the inverter during a discharging phase. The compensation circuitry also includes a second current source configured to selectively enhance charging of the gate of the inverter during the charging phase and to selectively slow discharging of the gate of the inverter during the discharging phase.