Wire-Bonded Semiconductor Package for RF Impedance Matching
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Solution Overview
Problem
Semiconductor packages operating at high frequencies face challenges in impedance matching between input and output pads, leading to signal reflection and quality deterioration due to parasitic components generated during wire-bonding, which affects RF input and output impedance.
Innovation Solution
The semiconductor package incorporates a circuit element or passive element connected between the IC pad and package pad through wires, controlling impedance by varying the length and thickness of the wires, and using components like capacitors, resistance elements, or microstrip lines in parallel or series configurations to match RF input and output impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire-bonding is used to connect IC pad and package pad, then electrical connection is established, but parasitic components are generated causing impedance mismatch
Solution Approach 1:
A circuit element is introduced as an intermediary component between the IC pad and package pad. This circuit element acts as a mediator to compensate for the parasitic components generated by wire-bonding, thereby achieving impedance matching at RF frequencies without requiring changes to the wire-bonding process itself.
Solution Approach 2:
The circuit element is designed with specific electrical parameters (capacitance, inductance, or resistance values) that are optimized to counteract the parasitic effects of wire-bonding. By carefully selecting and adjusting these parameters, the overall impedance of the connection path is matched to the characteristic impedance at RF frequencies.
2Ease of manufacture
If simple wire connection is used between IC pad and package pad, then manufacturing is simple, but signal reflection occurs at high frequencies
Solution Approach 1:
The circuit element serves as an intermediary that is relatively easy to integrate into the existing wire-bonding manufacturing process. It can be added as an additional component without fundamentally changing the manufacturing methodology, thus maintaining ease of manufacture while improving signal quality.
Solution Approach 2:
The circuit element's parameters are designed to provide impedance matching across the operating frequency range, which reduces signal reflection and improves signal quality. This is achieved through careful selection of component values that compensate for the parasitic effects in the high-frequency signal path.
Data Source
AI summary
A semiconductor package is provided. The semiconductor package includes a semiconductor chip including an integrated circuit (IC) pad configured to output a wireless frequency signal, a lead frame including a package pad configured to receive the wireless frequency signal, a first wire of which one end is connected to the IC pad, a second wire of which one end is connected to the package pad, and a circuit element connected to the first wire and the second wire in parallel or in series. A radio frequency (RF) output impedance of the package pad or an RF output impedance of the IC pad is controlled by a type of the circuit element or a connection relationship between the circuit element, the first wire, and the second wire.