High-Frequency Circuit Wire Bonding for Phase Uniformity
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Solution Overview
Problem
High-frequency circuits face operational issues due to electrical length differences between central and peripheral portions of transistors, causing position-dependent operation and interfering with ideal signal distribution and synthesis.
Innovation Solution
A high-frequency circuit design that corrects electrical length differences by varying wire bonding positions, utilizing open stubs to reduce parasitic inductance and adjust transmission line lengths, allowing for improved operating characteristics without increasing substrate size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding positions are kept fixed for all output portions, then manufacturing is simple, but electrical length differences cause position-dependent operation and degraded circuit performance
Solution Approach 1:
The patent applies local quality by setting different wire bonding positions for different output portions based on their specific electrical length characteristics. The control unit configures each wire bonding position individually to compensate for the electrical length difference between central and peripheral output portions, ensuring uniform circuit operation across all positions.
2Reliability
If transmission line lengths are extended to compensate for electrical length differences, then signal transmission phase uniformity improves, but substrate area increases
Solution Approach 1:
The patent changes the parameter of wire bonding position rather than extending transmission line lengths. By adjusting where wires are bonded to the substrate, the electrical length differences are compensated without increasing the physical substrate area, thus maintaining signal transmission phase uniformity while avoiding area expansion.
3Ease of manufacture
If standard wire bonding is used for all output portions, then manufacturing process is simple, but parasitic inductance varies and degrades high-frequency performance
Solution Approach 1:
The patent applies local quality by optimizing wire bonding positions for each output portion based on its electrical length characteristics. This individualized configuration compensates for parasitic inductance variations caused by different path lengths, improving high-frequency operation characteristics while maintaining manufacturing simplicity through automated control.
Data Source
AI summary
A high-frequency circuit includes: a first substrate; a transmission line formed on the first substrate and having first and second output portions branched from an input portion; a second substrate; first and second pads formed on the second substrate; a first wire connecting the first output portion to the first pad; and a second wire connecting the second output portion to the second pad, wherein an electrical length from the input portion to an edge of the second output portion is longer than an electrical length from the input portion to an edge of the first output portion, and a length from a junction between the second wire and the second output portion to the edge of the second output portion is longer than a length from a junction between the first wire and the first output portion to the edge of the first output portion.