Signal Output Circuit Harmonic Filtering in Compact Chip Packages
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Solution Overview
Problem
Signal output circuits in chip packages face interference due to electrical coupling between power and output signal wires, leading to noise and generation of additional harmonics, which affect amplification efficiency.
Innovation Solution
A signal output circuit with an anti-interference mechanism that includes an amplifier, a transformer circuit, and a power-terminal side anti-interference circuit, using bond wires and capacitors to filter out first-order harmonics and suppress second-order harmonics, thereby reducing interference and maintaining amplification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the power wire and output signal wire are disposed in proximity or on the same side to save chip package space, then the chip package area is reduced, but electrical coupling between the wires generates noise and interference on the power supply
Solution Approach 1:
The patent introduces a power-terminal side anti-interference capacitor as an intermediary element between the power wire and ground. This capacitor forms an LC filter with the bond wire inductance, specifically targeting and filtering out first-order harmonics coupling signals that interfere with the power supply, thereby resolving the electrical coupling noise problem while maintaining the compact wire layout
Solution Approach 2:
The patent changes the electrical parameters of the power terminal by adding the anti-interference capacitor, which modifies the impedance characteristics and filtering properties of the power supply path. This parameter change enables the system to reject harmonic interference while maintaining the physical proximity of wires for space efficiency
2Device complexity
If the amplifier and transformer are connected through bond wires to share power supply, then the circuit complexity is reduced, but first-order harmonics couple to the amplifier bond wire and generate additional second-order harmonics
Solution Approach 1:
The power-terminal side anti-interference capacitor acts as a mediator that blocks the propagation of first-order harmonics from the transformer circuit to the amplifier through the shared power bond wire. By filtering these harmonics at the power terminal, the capacitor prevents their conversion into second-order harmonics in the amplifier, thus reducing harmful harmonic generation while maintaining circuit simplicity
Solution Approach 2:
The patent applies preliminary anti-action by preemptively filtering out first-order harmonics at the power terminal before they can couple into the amplifier and generate second-order harmonics. This preventive measure stops the harmful harmonic generation process at its source, maintaining signal quality without adding complex harmonic cancellation circuits
3Reliability
If a voltage-stabilizing capacitor is added to suppress second-order harmonics, then the harmonic suppression improves, but the circuit area increases
Solution Approach 1:
The patent merges the anti-interference function into the existing power-terminal side bond wire by adding a capacitor that forms an LC filter with the wire's inherent inductance. This combined approach uses the existing bond wire structure rather than adding separate filtering components, achieving effective first-order harmonic filtering while minimizing additional circuit area
Solution Approach 2:
The power-terminal side anti-interference capacitor serves multiple functions: it filters first-order harmonics from the power supply, stabilizes the power terminal voltage, and prevents harmonic coupling to the amplifier. This multi-functional component achieves comprehensive harmonic suppression without requiring separate dedicated circuits for each function, thereby limiting circuit area increase
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 filters out first-order harmonics, preventing the generation of second-order harmonics and enhancing anti-interference efficiency while requiring a smaller circuit area, thus improving signal output quality.
Implementation Method 1
The power-terminal side anti-interference capacitor is electrically coupled between the power-terminal side bond wire and the first amplifier bond wire, to operate together with the power-terminal side bond wire, so as to filter out a first-order harmonics coupling signal
Implementation Method 2
The voltage-stabilizing capacitor is configured to suppress second-order harmonics of the amplifier
Data Source
AI summary
The present invention discloses a signal output circuit having anti-interference mechanism. An amplifier is electrically coupled to a power supply and a ground terminal through a first and a second amplifier bond wires, and generates an amplified output signal. A transformer circuit includes a transformer performing impedance transformation on the amplified output signal to generate a transformed output signal and a voltage-stabilizing capacitor suppressing second-order harmonics of the amplifier. A power-terminal side anti-interference circuit includes a power-terminal side bond wire and a power-terminal side anti-interference capacitor. The power-terminal side bond wire is electrically coupled to the ground terminal. The power-terminal side anti-interference capacitor is electrically coupled between the power-terminal side bond wire and the first amplifier bond wire, to cooperate with the power-terminal side bond wire, to filter out a first-order harmonics coupling signal coupled to the first amplifier bond wire by the transformed output signal generated by the transformer circuit.