Temperature-Compensated Oscillator Bias Trimming for Stable Clocking
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Solution Overview
Problem
Charge pumps in non-volatile memory systems operate inefficiently during regulation, leading to significant power consumption due to mismatched pump strength and load, resulting in low efficiency, especially after the capacitive load is charged up and leakage current takes over.
Innovation Solution
A clock generation circuit that dynamically adjusts the clock frequency based on load requirements, using a variable resistance element and a variable current source connected to a temperature code, to match the pump's driving strength with the DC load, thereby improving power efficiency and reducing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a charge pump operates with fixed pump strength, then the circuit design is simple, but power consumption increases due to mismatched pump strength and load during regulation
Solution Approach 1:
The charge pump transitions from fixed pump strength to dynamic pump strength adjustment. The pump clock frequency is dynamically adjusted based on load conditions, allowing the pump to adapt its driving strength to match the actual load requirements during regulation, thereby reducing power consumption while maintaining operational simplicity.
2Productivity
If the charge pump operates at full strength, then it can handle maximum load requirements, but efficiency decreases during light load regulation
Solution Approach 1:
The pump clock frequency parameter is changed dynamically based on load conditions. During light load regulation, the frequency is reduced to match the lower load requirements, improving power efficiency. During maximum load conditions, the frequency can be increased to provide full pump strength, thus maintaining both productivity and efficiency across different operating conditions.
3Ease of operation
If the pump clock frequency is fixed, then the circuit operation is simple, but current consumption increases during regulation phase
Solution Approach 1:
The pump clock frequency transitions from a fixed value to a dynamically adjustable parameter. The frequency is adjusted based on the regulation phase and load conditions, allowing the circuit to operate efficiently during regulation by reducing the frequency when full pump strength is not needed, thereby reducing current consumption while maintaining simple circuit operation.
Data Source
AI summary
Apparatus and methods are provided for a temperature-compensated oscillator adapted to receive an input reference current. The apparatus and methods include or provide a temperature coefficient control circuit adapted to adjust the input reference current based on temperature information, wherein the temperature coefficient control circuit receives a first signal corresponding to the temperature information at a first signal node, and a second signal corresponding to a trimmed bias signal at a second signal node.