Dynamic Amplifier Gain Boosting With Level-Shifted Common-Mode Voltage
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Solution Overview
Problem
Existing dynamic amplifiers face limitations in gain boosting due to the constraint of power supply voltage, leading to increased circuit cost and power consumption when using additional capacitor pairs for extended integrating time.
Innovation Solution
A dynamic amplifier design incorporating a level shifter that shifts the output voltage of the output capacitor to a higher reference voltage, increasing the variation of common-mode voltage and effectively boosting gain without the need for additional capacitors, achieved through a method involving switches and voltage detection nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional capacitor pairs are included in the dynamic amplifier to extend integrating time, then gain is improved, but circuit complexity and power consumption increase
Solution Approach 1:
The patent changes the voltage reference parameter by introducing a level shifter that switches the output capacitor between different reference voltage nodes (first reference voltage node and second reference voltage node). This parameter change enables extended integrating time and increased gain without adding more capacitors, thereby avoiding increased circuit complexity while achieving the desired gain improvement
2Measurement precision
If additional capacitor pairs are included in the dynamic amplifier to extend integrating time, then gain is improved, but power consumption increases
Solution Approach 1:
The patent uses parameter changes by switching the reference voltage node to extend the integrating time and boost gain. This approach avoids the need for additional capacitors that would require extra charging/discharging operations, thereby reducing power consumption while achieving gain improvement
3Measurement precision
If the variation of common-mode voltage is increased to boost gain, then gain is improved, but the variation is limited under power supply voltage
Solution Approach 1:
The patent introduces a new dimension by adding a level shifter that provides an additional voltage reference node. This dimensional extension allows the common-mode voltage to vary beyond the traditional power supply voltage limits, enabling gain boosting without being constrained by the original voltage supply limitations
Data Source
AI summary
A dynamic amplifier includes a first output capacitor, a first switch, a current source, a second switch, a voltage detector, a third switch and a level shifter. The first switch is coupled between a first terminal of the first output capacitor and a voltage detection node. The second switch is coupled to the current source and the voltage detection node. The voltage detector is coupled to the voltage detection node and the first switch. The third switch is coupled between the voltage detection node and a power source. The level shifter is coupled to a second terminal of the first output capacitor.