Harmonic Filter Circuit for Bond-Wire Inductance Compensation
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Solution Overview
Problem
Conventional filters in external digital pre-distortion circuits fail to effectively filter third-order harmonics due to additional inductance effects from traces and bond wires, leading to inconsistent performance.
Innovation Solution
A filter design incorporating inductive components like inductors and capacitors is used to offset the inductance caused by traces and bond wires, ensuring effective filtering of third-order harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional filter is used in the external pre-distortion circuit, then the filter structure is simple, but the additional inductance effects from traces and bond wires cause the filter characteristics to deviate from expected performance
Solution Approach 1:
The patent applies preliminary anti-action by introducing a compensating inductor that generates an opposite inductance effect to counterbalance the harmful inductance from traces and bond wires. The compensating inductor is configured with its inductance value equal to the sum of trace inductance and bond wire inductance, creating a null effect that eliminates the harmful inductance impact on filter performance.
Solution Approach 2:
The patent uses an intermediary approach by introducing a compensating inductor as a mediator element between the power supply voltage and the filter circuit. This intermediary component absorbs and counteracts the harmful inductance effects, allowing the filter to operate with expected characteristics despite the presence of traces and bond wires.
2Adaptability or versatility
If the ground voltage connection includes traces and bond wires, then the circuit layout is flexible, but additional inductance effects are introduced that prevent effective filtering of third-order harmonics
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring a compensating inductor with an inductance value that exactly counterbalances the harmful inductance from traces and bond wires. This compensating inductor is connected to the power supply voltage terminal and generates an opposite magnetic field effect that nullifies the harmful inductance, enabling effective third-order harmonic filtering despite the flexible circuit layout with traces and bond wires.
3Ease of manufacture
If additional inductance effects are present in the ground voltage connection, then the physical layout can accommodate package constraints, but the filter cannot effectively suppress third-order harmonics
Solution Approach 1:
The patent applies preliminary anti-action by introducing a compensating inductor that is pre-calculated to have an inductance value equal to the sum of trace inductance and bond wire inductance. This compensating inductor is connected in series with the power supply voltage terminal and generates an opposite inductance effect that precisely counterbalances the harmful inductance, enabling the filter to achieve accurate third-order harmonic suppression while maintaining package compatibility.
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 filter design stabilizes performance by balancing equivalent inductance, effectively filtering third-order harmonics and improving third-order counter intermodulation (CIM3) performance.
Implementation Method 1
The first component and the second component are inductive components... offset the inductance caused by traces and bond wires... balancing equivalent inductance
Data Source
AI summary
The present invention provides a filter configured to receive an input signal to generate a filtered signal. The filter includes a first component, a first capacitor and a second component. The first component is coupled between the input signal and a first terminal. The first capacitor is coupled between the first terminal and a second terminal. For the second component, a first node of the second component is coupled to the second terminal, and a second node of the second component is used to output the filtered signal. The first component and the second component are inductive components.