Differential Voltage-to-Current Circuit With Controlled Input Impedance
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Solution Overview
Problem
Existing differential voltage-to-current conversion circuitry is inefficient and lacks optimal gain in some applications, limiting the resolution of ADC circuitry and signal power conversion.
Innovation Solution
The proposed circuitry employs highly controlled input impedance and adjustable gain through measurement impedances and bias voltage control, ensuring direct signal current feedthrough and efficient signal power conversion, using PMOS transistors in a common gate configuration to achieve highly linear voltage-to-current conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing differential voltage-to-current conversion circuitry is used, then the conversion function is provided, but the conversion efficiency is insufficient and gain is not optimal
Solution Approach 1:
The patent changes the operating parameters of the conversion circuit by using PMOS transistors in common gate configuration with specifically controlled input impedance. The bias voltage control and measurement impedances adjust key electrical parameters to achieve both high conversion efficiency and optimal gain, resolving the contradiction between energy loss and conversion reliability.
2Measurement precision
If existing conversion circuitry is used, then basic voltage-to-current conversion is achieved, but the resolution of ADC circuitry is limited
Solution Approach 1:
The patent optimizes electrical parameters including input impedance control and bias voltage settings to enhance ADC resolution while maintaining efficient power conversion. The measurement impedances and common gate configuration are specifically designed to improve measurement precision without sacrificing power conversion capability.
3Power
If existing conversion circuitry is used, then conversion function is provided, but gain control is not optimal
Solution Approach 1:
The patent achieves optimal gain control through parameter adjustments in the common gate configuration, utilizing bias voltage control and measurement impedances to fine-tune the conversion characteristics. This approach provides optimal gain without significantly increasing circuit complexity, as it leverages the inherent properties of the PMOS transistor configuration.
Data Source
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AI summary
The present invention relates to circuitry for voltage-to-current conversion, and in particular to differential voltage-to-current conversion circuitry. Such circuitry is operable to receive a differential voltage input signal and output a corresponding differential current signal.