Feedforward Cancellation Circuit for Closely Spaced Inductor Oscillators
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Solution Overview
Problem
As electronic devices become smaller and more densely packed, undesirable coupling between inductors, such as a 'pulling' effect, occurs due to magnetic and electrical interactions, making it challenging to design closely-spaced oscillators effectively.
Innovation Solution
The implementation of a feedforward cancellation circuit that uses first and second capacitor circuits to provide feedforward signals to adjust magnetic coupling between inductor circuits, operating at different frequencies, thereby mitigating undesirable coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If oscillators are closely spaced to save die space, then area utilization is improved, but magnetic coupling between inductors increases causing frequency pulling
Solution Approach 1:
A capacitor is introduced as an intermediary component connected between the inductors of closely-spaced oscillators. This capacitor provides an alternative current path that compensates for magnetic coupling effects, allowing the oscillators to be placed closer together while maintaining frequency stability and reducing the pulling effect.
2Productivity
If inductors are placed close together, then device density is improved, but frequency stability deteriorates due to coupling effects
Solution Approach 1:
The capacitor acts as a mediator that stabilizes the interaction between closely-spaced inductors. By providing a controlled current path through the capacitor, the harmful magnetic coupling effects are compensated, enabling high device density while maintaining reliable frequency operation of each oscillator.
3Object-affected harmful factors
If capacitor value is increased to reduce coupling, then coupling reduction is improved, but circuit complexity and component count increase
Solution Approach 1:
Instead of modifying the entire oscillator circuit or using complex active compensation networks, the solution applies a simple passive capacitor locally between the inductor terminals. This localized approach effectively reduces coupling effects without adding significant circuit complexity, maintaining the simplicity of the original oscillator design while achieving the desired isolation.
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 effectively reduces magnetic and electrical coupling between inductor oscillators, minimizing the 'pulling' effect and allowing for independent operation of closely-spaced oscillators, with coupling reduction achievable by about 10 dB or more.
Implementation Method 1
a first magnetic coupling generated by the first inductor circuit
Implementation Method 2
a second magnetic coupling generated by the second inductor circuit
Data Source
AI summary
The present disclosure describes a circuit that includes a first inductor circuit, a second inductor circuit, a first capacitor circuit, and a second capacitor circuit. The first inductor circuit includes a first inductor and a first driver circuit. The second inductor circuit includes a second inductor and a second driver circuit. The first inductor circuit operates at a first frequency. The second inductor operates at a second frequency. The first capacitor circuit provides a first signal to the second inductor circuit to adjust a first magnetic coupling generated by the first inductor circuit. The second capacitor circuit provides a second signal to the first inductor circuit to adjust a second magnetic coupling generated by the second inductor circuit.