Power Mixer Transconductance Circuit for RF Linearity
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Solution Overview
Problem
Conventional methods for converting voltage signals to current signals in power mixers for transceivers result in poor linearity, affecting RF signal output quality.
Innovation Solution
A power mixer with high-linearity transconductance is achieved through a circuit structure comprising a mixer switching circuit and a transconductance amplifier, where the output of the transconductance amplifier supplies current to the power mixer based on received voltage, with specific configurations of transistors and resistors/capacitors to enhance linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a resistor or resistor-equivalent circuit is used to convert voltage signal to current signal, then the conversion function is achieved, but the linearity of the current signal deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of the conversion circuit from passive resistance to active transconductance amplification. By using a transconductance amplifier with controlled gain, the circuit achieves high linearity in converting voltage to current signals, resolving the linearity deterioration issue inherent in resistor-based approaches.
Solution Approach 2:
The patent replaces the passive electrical resistance mechanism with an active electronic amplification mechanism. The transconductance amplifier uses active devices (transistors) to provide controlled current output based on voltage input, substituting the simple resistive conversion with a more sophisticated but linear electronic control system.
2Manufacturing precision
If a transconductance amplifier is introduced to improve linearity, then the linearity of current signal improves, but the device complexity increases
Solution Approach 1:
The patent segments the conversion function into distinct functional blocks: the transconductance amplifier for linear voltage-to-current conversion, and the mixer switching circuit for signal modulation. This segmentation allows each component to be optimized independently, achieving high overall linearity while managing complexity through functional decomposition.
Solution Approach 2:
The transconductance amplifier is designed to serve multiple functions: it provides linear voltage-to-current conversion, acts as a buffer between stages, and enables precise control of the mixer input current. This multi-functionality reduces the need for additional dedicated circuits, thereby limiting the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution significantly improves the linearity of the current signal output, leading to better RF signal performance compared to traditional resistor-based methods.
Implementation Method 1
a transconductance amplifier having an input terminal connected to an input terminal of the mixer switching circuit, where the output terminal of the mixer switching circuit supplies a current to the power mixer based on a voltage received by the transconductance amplifier
Data Source
AI summary
The present disclosure provides a power mixer having high-linearity transconductance, a transmitter and an RF transceiver. The power mixer having high-linearity transconductance comprises a power mixer and the following circuit structure: a mixer switching circuit having an output terminal directly connected to an input terminal of the power mixer; and a transconductance amplifier having an input terminal connected to an input terminal of the mixer switching circuit, wherein the output terminal of the mixer switching circuit supplies a current to the power mixer based on a voltage received by the transconductance amplifier from the input terminal of the mixer switching circuit.