Transformer Mixer Circuit With Inductive Loads for Higher Conversion Gain
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Solution Overview
Problem
RF circuits face challenges in achieving high conversion gain and low noise figure, which affects the performance and cost of Low Noise Amplifiers (LNAs) in receivers.
Innovation Solution
The RF circuit design incorporates a transformer, local oscillators, and mixers with inductors to generate transformed signals and mixed signals, increasing the inductance of the load, thereby improving conversion gains and reducing local oscillating signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mixer with high conversion gain is adopted, then noise in the receiver is reduced, but device complexity increases
Solution Approach 1:
The patent combines the inductor functions into a shared component structure where a single inductor serves multiple mixer inputs (I+ and I-), reducing the total number of inductors needed while maintaining high conversion gain and low noise figure performance
2Reliability
If conversion gain is increased to reduce LNA cost, then receiver performance improves, but local oscillating signal loss increases
Solution Approach 1:
The patent optimizes the inductor quality factor (Q-value) and adjusts operating frequency parameters to achieve high conversion gain while minimizing local oscillating signal loss, resolving the trade-off between receiver performance and signal loss
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 configuration enhances the performance of the RF circuit by increasing conversion gains and reducing noise, ultimately leading to improved receiver performance and reduced costs.
Implementation Method 1
an inductor, coupled between the positive in-phase input and the negative in-phase input
Data Source
AI summary
A radio frequency circuit includes a transformer, a local oscillator, a first mixer, a second mixer, a first variable gain amplifier, and a second variable gain amplifier. The first mixer includes a first inductor that is coupled between a positive in-phase input and a negative in-phase input. The second mixer includes a second inductor that is coupled between a positive quadrature input and a negative quadrature input. The first and second inductors provide inductive loads and improve conversion gains of the first and second mixers respectively.