Reconfigurable RF Mixer Architecture for Linearity and Low Power
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Solution Overview
Problem
Existing radio frequency (RF) mixers face challenges in efficiently and effectively performing frequency conversions with high linearity and low noise, particularly in varying operational modes, which affects their performance and power consumption.
Innovation Solution
A mixer design incorporating a transconductance stage with a differential transistor pair, bias circuit, and feedback circuit, controlled by a controller to configure different operation modes, including a transimpedance amplifier for downconversion of RF signals, enabling flexible operation and optimized performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mixer is designed for high linearity and low noise performance, then conversion efficiency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic reconfiguration of the mixer circuitry, allowing the system to switch between different operational modes (high-linearity mode and power-saving mode) based on real-time performance requirements. The controller dynamically adjusts circuit configurations, enabling the mixer to adapt its characteristics rather than being fixed in a single high-performance state.
Solution Approach 2:
The system changes operational parameters such as bias currents, circuit topology, and component configurations to optimize performance. By varying these parameters based on operational mode, the mixer can achieve high linearity when needed while consuming less power during normal operations, thus resolving the contradiction between performance and power consumption.
2Manufacturing precision
If the mixer is configured for high linearity operation, then conversion accuracy is improved, but device complexity increases
Solution Approach 1:
The mixer is divided into multiple independent circuit blocks or stages, each optimized for specific functions. This segmentation allows the high-linearity components to be activated only when needed, while simpler configurations are used during normal operation, reducing overall complexity while maintaining conversion accuracy when required.
Solution Approach 2:
The mixer circuitry is designed with multi-functional components that can operate in different modes. A single circuit structure serves multiple purposes by reconfiguring its parameters, eliminating the need for separate dedicated high-linearity circuits and thus reducing overall device complexity while maintaining conversion accuracy when needed.
3Adaptability or versatility
If the mixer operates in multiple modes with reconfiguration, then adaptability is improved, but control complexity increases
Solution Approach 1:
The mixer incorporates automatic mode selection and self-configuring capabilities where the circuitry autonomously determines the appropriate operational mode based on input signal characteristics or system state. This self-service approach reduces the need for complex external control mechanisms while maintaining high adaptability across different operating conditions.
Data Source
AI summary
In one embodiment, the present invention includes a mixer having various stages, including a transconductance stage with a differential transistor pair, a bias circuit, and a feedback circuit. The transistor pair can include a first transistor having a first terminal to receive a first input radio frequency (RF) voltage and to output a first RF current via a second terminal of the first transistor, and a second transistor having a first terminal to receive a second input RF voltage and to output a second RF current via a second terminal of the second transistor. In turn, the bias circuit is coupled to the second terminals of the transistors to provide a bias current to these transistors. The feedback circuit is in turn coupled to the second terminals of the transistors to generate a feedback signal corresponding to a common mode voltage at the second terminals of the transistors.