Transformer-Coupled RF Mixer with Shared Bias Current
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Solution Overview
Problem
Designing mixers for wireless communications circuitry that balance performance with minimized power consumption is challenging.
Innovation Solution
The implementation of a transformer-based mixer that shares a DC bias current between a transconductor and a switching quad, eliminating the need for different power supply voltages and thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power supply voltages are used to bias the transconductor and switching quad, then each component can be optimized for its specific performance requirements, but power consumption increases and device complexity increases
Solution Approach 1:
The patent merges the biasing functions by coupling the center tap of the primary winding to the center tap of the secondary winding through a conductive path, allowing a single DC bias current to serve both the transconductor and switching quad simultaneously, thereby reducing power consumption while maintaining performance
Solution Approach 2:
The shared DC bias current path provides multi-functionality by enabling the same biasing mechanism to support both the transconductor and switching quad, eliminating the need for separate power supply voltages and reducing overall device complexity
2Reliability
If separate power supply voltages are used to bias the transconductor and switching quad, then each component can be optimized for its specific performance requirements, but device complexity increases
Solution Approach 1:
The patent merges the biasing functions by coupling the center tap of the primary winding to the center tap of the secondary winding through a conductive path, allowing a single DC bias current to serve both the transconductor and switching quad simultaneously, thereby reducing power consumption while maintaining performance
Solution Approach 2:
The shared DC bias current path provides multi-functionality by enabling the same biasing mechanism to support both the transconductor and switching quad, eliminating the need for separate power supply voltages and reducing 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
This solution enhances mixer linearity and performance while minimizing power consumption, achieving improved power efficiency without compromising performance.
Implementation Method 1
The transformer may have a primary winding and a secondary winding. The transformer may have a conductive path that couples a center tap contact of the primary winding to a center tap contact of the secondary winding.
Data Source
AI summary
An electronic device may include wireless circuitry with a mixer. The mixer may include a transconductor with first and second input transistors, a switching quad with first and second pairs of mixer transistors, and a transformer coupled between the transconductor and the switching quad. The transformer may have a primary winding and a secondary winding. The transformer may have a conductive path that couples a center tap contact of the primary winding to a center tap contact of the secondary winding. The conductive path may configure the transformer to share a DC bias current between the transconductor and the switching quad. This may eliminate the need to bias the transconductor and the switching quad using different power supply voltages, thereby minimizing power consumption without sacrificing performance.