Clock Generator Circuit for Charge Pump Voltage Scaling
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Solution Overview
Problem
Conventional charge pumps consume more power as the supply voltage increases due to constant clock frequency, leading to higher current consumption and increased layout area.
Innovation Solution
A clock generator circuit that adjusts its frequency as a decreasing function of the external power supply voltage, reducing power consumption by compensating for the increase in supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock frequency is kept constant in a charge pump, then the pump operation is simple and stable, but the power consumption increases as the supply voltage increases
Solution Approach 1:
The clock frequency is made dynamic rather than fixed, adjusting automatically based on the supply voltage level. The clock generator circuit responds to voltage changes by modifying the frequency, creating an adaptive system that optimizes power consumption while maintaining stable pump operation across different voltage conditions.
Solution Approach 2:
The system implements feedback by monitoring the supply voltage level and using this information to adjust the clock frequency. The clock generator circuit receives voltage level signals and modifies its output frequency accordingly, creating a closed-loop control mechanism that reduces power consumption while preserving operational stability.
2Use of energy by moving object
If the clock frequency is decreased to reduce power consumption, then the power consumption decreases, but the pump efficiency may be compromised
Solution Approach 1:
The system changes the clock frequency parameter dynamically based on supply voltage conditions. By adjusting this critical parameter in response to voltage variations, the system maintains the optimal balance between power consumption and pump efficiency, ensuring that the frequency is neither too high (wasting power) nor too low (reducing efficiency).
Data Source
AI summary
A charge pump system is formed on an integrated circuit that can be connected to an external power supply. The system includes a charge pump and a clock generator circuit. The clock circuit is coupled to provide a clock output, at whose frequency the charge pump operates and generates an output voltage from an input voltage. The clock frequency is a decreasing function of the voltage level of the external power supply. This allows for reducing power consumption in the charge pump system formed on a circuit connectable to an external power supply.