Dynamic Amplifier Precharge Switching for Stable Gain
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Solution Overview
Problem
Dynamic amplifiers are sensitive to parasitic capacitance, leading to gain variation and reduced linearity due to charge being taken from the output load capacitance during amplification.
Innovation Solution
Incorporating multiple parallel cascode switches with a cross-coupled configuration to precharge parasitic capacitance before amplification, reducing the impact on output load capacitance during the amplification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic amplifiers are used for signal amplification, then amplification speed and power efficiency are improved, but gain variation and linearity deteriorate due to sensitivity to parasitic capacitance
Solution Approach 1:
The patent applies preliminary action by pre-charging the parasitic capacitance at the common-source node before the amplification phase. During a pre-charge phase, switches are configured to charge the parasitic capacitance, and then during the amplification phase, the already-charged parasitic capacitance does not steal charge from the output load capacitance, thereby maintaining stable gain and linearity while preserving fast amplification performance
2Use of energy by moving object
If dynamic amplifiers are used for signal amplification, then power consumption is reduced, but sensitivity to parasitic capacitance increases causing gain variation
Solution Approach 1:
The patent implements preliminary action by introducing a pre-charge phase before amplification where the parasitic capacitance is charged in advance. This is achieved by configuring switches (first switch couple and second switch couple) to connect the common-source node to charge the parasitic capacitance, ensuring that during subsequent amplification, the parasitic capacitance does not cause gain variation by stealing charge from the output load capacitance
Solution Approach 2:
The patent applies dynamics by using time-varying switch configurations to control the charging and amplification phases. The first and second switch couples are dynamically controlled to be closed during pre-charge and opened during amplification, while third and fourth switch couples are opened during pre-charge and closed during amplification, enabling the amplifier to adapt its behavior based on the operational phase while maintaining low power consumption
Data Source
AI summary
Techniques and apparatus for reducing sensitivity (e.g., less gain variation due to parasitic capacitance) in dynamic amplifiers. One example dynamic amplifier generally includes a pair of differential input transistors, a pair of cross-coupled switches coupled between the pair of differential input transistors and a pair of differential output nodes for the dynamic amplifier, a first pair of switches coupled between the pair of differential input transistors and the pair of differential output nodes, and a second pair of switches coupled between the pair of differential input transistors and the pair of differential output nodes.