Dual Capacitor Array Regulation for Precise IC Capacitance Control
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Solution Overview
Problem
Existing regulation devices for variable capacitance in integrated circuits face inefficiency in achieving required accuracy, particularly when the RC product is lower than the preset value, leading to increased complexity and cost due to excessive use of regulation bits.
Innovation Solution
An electronic regulation device with a dual array of switching capacitors, where each array has binarily increasing capacitances from different minimum values, allowing for more precise control of capacitance through binary logic signals, thereby optimizing capacitance variation and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of capacitances involved is increased to ensure required accuracy when RC product is lower than preset value, then the regulation accuracy is improved, but the device complexity and silicon area occupation increase
Solution Approach 1:
The capacitor block is segmented into two distinct arrays: a first array of capacitors with binarily increasing capacitances starting from a first minimum value, and a second array of capacitors with binarily increasing capacitances starting from a second minimum value. This segmentation allows selective activation of appropriate capacitor arrays based on the RC product measurement, enabling accurate regulation without requiring all capacitors to be simultaneously available, thus reducing the effective device complexity for any given regulation state.
Solution Approach 2:
Different arrays of capacitors are designed with different minimum capacitance values tailored to specific regulation ranges. The first array is optimized for regulating when the RC product is higher than the preset value, while the second array is optimized for when the RC product is lower than the preset value. This local optimization ensures that each array provides appropriate precision for its intended operating condition without requiring excessive capacitance elements across all conditions.
2Measurement precision
If the number of capacitances involved is increased to ensure required accuracy, then the regulation accuracy is improved, but the silicon area occupation increases
Solution Approach 1:
By segmenting the capacitor block into two arrays that can be selectively activated, the patent reduces the silicon area required compared to having all capacitors simultaneously available. The selective activation means that only the necessary capacitor array is instantiated for each regulation scenario, effectively halving the required silicon area while maintaining the ability to achieve required accuracy through appropriate array selection.
3Device complexity
If a single array of capacitors is used for regulation, then the device complexity is reduced, but the regulation accuracy varies significantly depending on the number of capacitors activated
Solution Approach 1:
The patent applies local quality by designing each capacitor array with specific minimum capacitance values optimized for its intended regulation range. The first array uses a first minimum capacitance value optimized for higher RC product conditions, while the second array uses a second minimum capacitance value optimized for lower RC product conditions. This ensures that each array provides consistent and appropriate regulation accuracy for its specific operating condition, eliminating the significant accuracy variations that would occur with a single array designed for all conditions.
Data Source
AI summary
The present disclosure relates to an electronic regulation device of a variable capacitance of an integrated circuit having a time parameter depending on the variable capacitance. The regulation device includes a regulation loop, and is configured to generate in output a plurality of binary regulation signals.