Balun-Coupled Noise-Cancellation Amplifier With Cross-Coupled Inductors
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Solution Overview
Problem
Conventional noise-cancellation amplifiers require complex layouts and many components, leading to increased area and power consumption, and are sensitive to process variations, making them challenging to implement efficiently.
Innovation Solution
A noise-cancellation amplifier design using cross-coupled inductors instead of capacitors and resistors, integrated with a balun device, simplifies the layout and reduces component count, enhancing symmetry and immunity to production variances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional noise-cancellation amplifiers use resistors and capacitors for noise cancellation, then noise cancellation function is achieved, but device complexity and component count increase
Solution Approach 1:
The patent extracts and removes resistors and capacitors from the conventional noise-cancellation amplifier circuit, replacing them with an inductor-based noise cancellation network. This extraction eliminates unnecessary components while preserving the essential noise cancellation function through inductive coupling between the balun device and the amplifier stage.
Solution Approach 2:
The patent merges the noise cancellation function with the existing inductor structures in the amplifier circuit. By utilizing the inherent inductors in the balun device and coupling them with additional inductors, the noise cancellation function is integrated into the existing circuit topology without adding separate resistor-capacitor networks.
2Reliability
If conventional noise-cancellation amplifiers use multiple components for noise cancellation, then noise cancellation performance is achieved, but chip area increases
Solution Approach 1:
The patent removes resistors and capacitors that occupy significant chip area, replacing them with compact inductor-based noise cancellation networks. The inductive coupling approach requires fewer discrete components, thereby reducing the overall chip area while maintaining noise cancellation performance.
Solution Approach 2:
The inductors in the circuit serve multiple functions: they provide impedance matching, signal coupling, and noise cancellation simultaneously. This multi-functionality reduces the need for separate dedicated noise cancellation components, thereby minimizing chip area consumption.
3Reliability
If conventional noise-cancellation amplifiers use complex layouts with many components, then noise cancellation is achieved, but manufacturing precision requirements increase due to sensitivity to process variations
Solution Approach 1:
The patent removes resistors and capacitors that are highly sensitive to process variations and require tight manufacturing tolerances. The inductor-based noise cancellation network is less sensitive to such variations, thereby reducing manufacturing precision requirements while maintaining noise cancellation effectiveness.
Solution Approach 2:
The patent changes the fundamental parameter basis for noise cancellation from resistive-capacitive time constants to inductive coupling coefficients. Inductors generally exhibit better process tolerance and less sensitivity to manufacturing variations compared to resistors and capacitors, thereby improving robustness against process variations.
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 design achieves a stable and efficient noise cancellation with reduced chip area, lower noise figure, and improved gain-bandwidth product, while being less dependent on process variations.
Implementation Method 1
the first inductor system is inductively coupled with the second inductor system and the second inductor system is inductively coupled with the third inductor system
Data Source
AI summary
Described is a noise-cancellation amplifier, comprising a first inductor system with a first inductor (L1) and a second inductor (L2); a second inductor system with a third inductor (L3) and a fourth inductor (L4); a first transistor (T1) being coupled with the third inductor (L3); a second transistor (T2) being coupled with the fourth inductor (L4); and a third inductor system with a fifth inductor (L5) and a sixth inductor (L6), the fifth inductor (L5) being coupled with a gate of the first transistor (T1) and the sixth inductor (L6) being coupled with a gate of the second transistor (T2); wherein the first inductor system is inductively coupled with the second inductor system and the second inductor system is inductively coupled with the third inductor system. In this way, a noise cancellation effect of the noise cancellation amplifier may be improved.