Bond Wire LC Resonator with Distributed Capacitors
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Solution Overview
Problem
RF systems face challenges with parasitic effects impacting the accuracy of resonance and overall efficiency of power amplifiers due to harmonic impedances in series and parallel LC tank circuits.
Innovation Solution
A parallel LC resonator design featuring an inductor formed from a bond wire coupled to input and output pads with a series of capacitors distributed to span a predetermined distance, minimizing parasitic effects by using larger capacitors, thereby achieving resonance with greater accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional series and parallel LC tank circuits are used to trap frequencies and terminate power amplifier harmonic impedances, then the power amplifier can be tuned to isolate harmonic impedances, but parasitic effects impact the accuracy of achieving resonance and overall efficiency
Solution Approach 1:
The capacitor is divided into multiple series-connected capacitor elements (e.g., five capacitor elements C1-C5). This segmentation allows each individual capacitor element to be physically larger in size, thereby reducing parasitic effects while maintaining the same total capacitance value. The segmented capacitors are distributed along the bond wire to minimize parasitic inductance.
Solution Approach 2:
The capacitors are distributed spatially along the length of the bond wire rather than being concentrated at a single location. This spatial distribution in the dimensional domain helps minimize parasitic inductance by spreading out the capacitive elements, thereby improving resonance accuracy.
2Measurement precision
If larger capacitors are used to minimize parasitic effects, then resonance accuracy is improved, but the device complexity and layout area increase
Solution Approach 1:
The bond wire serves multiple functions: it provides the inductive element for the LC tank circuit and simultaneously serves as the spatial framework for distributing the capacitive elements. This multi-functionality reduces overall device complexity by eliminating the need for separate mounting structures.
Solution Approach 2:
The inductor (bond wire) and capacitors are merged into a single integrated LC tank circuit structure. The capacitors are directly coupled to the bond wire at different positions, combining multiple components into a unified structure that reduces overall complexity and improves integration.
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 solution effectively reduces parasitic inductance and resistance, enhancing the accuracy of resonance and efficiency of power amplifiers by distributing larger capacitors in series, improving the performance of RF systems.
Implementation Method 1
The inductor and plurality of capacitors have values tuned to a desired resonance
Implementation Method 2
By arranging the capacitors in series, each capacitor can be physically larger thus minimizing parasitic effects and achieving resonance with greater accuracy
Data Source
AI summary
An integrated circuit (IC) includes an input pad and an output pad separated from the input pad by a predetermined distance. A plurality of capacitors are coupled in series between the input pad and the output pad. The plurality of capacitors are distributed to substantially span the predetermined distance. An inductor is formed from a bond wire, having a first end attached at the first input pad and a second end attached at the output pad. The inductor and plurality of capacitors configured to form a predetermined open circuit resonance.