RF Voltage-to-Current Circuit with Differential Pairs
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Solution Overview
Problem
Conventional RF receiving front-end circuits face challenges in achieving high linearity and low power consumption in voltage-to-current converting circuits, often requiring larger inductors or current sources that increase costs and DC power consumption.
Innovation Solution
A voltage-to-current converting circuit comprising a DC bias circuit, first and second DC-blocking circuits, and differential input pairs, connected via resistors, which generates bias voltage, blocks direct current, and outputs current through resistors, reducing the need for large components and minimizing DC power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If larger inductors or current sources are used to increase extra currents, then linearity is improved, but product costs increase and DC power consumption increases
Solution Approach 1:
The patent changes the operating parameters of the voltage-to-current converting circuit by using differential input pairs with resistive feedback, operating at optimized bias points to achieve high linearity without requiring larger inductors or current sources. This parameter optimization resolves the contradiction between linearity and power consumption.
Solution Approach 2:
The patent introduces differential input pairs as an intermediary mechanism between the voltage input and current output. These differential pairs, combined with resistive feedback, provide the necessary linearity improvement without directly increasing the size of inductors or current sources, thereby avoiding the associated power consumption penalty.
2Manufacturing precision
If larger inductors or current sources are used to increase extra currents, then linearity is improved, but product costs increase
Solution Approach 1:
The patent replaces expensive, large-sized inductors and current sources with cheaper alternative components - specifically differential input pairs with resistive feedback networks. These alternative components achieve the same linearity performance at lower cost, effectively applying the principle of substituting expensive components with more economical ones.
Solution Approach 2:
The patent achieves linearity improvement through parameter optimization of the voltage-to-current converting circuit, using differential input pairs operated at specific bias conditions. This approach avoids the need for expensive large inductors while maintaining high linearity, thus resolving the cost-performance contradiction.
3Device complexity
If conventional voltage-to-current converting circuits are used, then circuit simplicity is maintained, but linearity and power consumption performance are insufficient
Solution Approach 1:
The patent segments the voltage-to-current conversion function into distinct differential input pairs with separate resistive feedback paths. This segmentation allows each differential pair to operate in its optimal linear region while the overall circuit maintains a relatively simple structure, achieving high linearity without excessive complexity.
Data Source
AI summary
A voltage-to-current converting circuit, comprising: a direct current (DC) bias circuit, a first DC-blocking circuit, a second DC-blocking circuit, a first differential input pair and a second differential input pair; wherein the DC bias circuit is connected to the first and second DC-blocking circuits and configured to provide a bias voltage to the first and the second differential input pairs; wherein the first DC-blocking circuit is connected between the DC bias circuit and the first and second differential input pair and the second DC-blocking circuit is connected between the DC bias circuit and the first and second differential input pair; and wherein the first differential circuit is connected to the second differential circuit via two resistors.