High-Frequency Amplifier Layout With Distributed Impedance Matching
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Solution Overview
Problem
Existing high-frequency amplifiers for 5G systems face challenges in reducing chip size and cost, particularly due to the large size of matching circuits on semiconductor substrates like GaN, which consume high power and generate heat, and existing solutions do not adequately address these issues.
Innovation Solution
A high-frequency amplifier configuration using multiple substrates, where a first substrate includes a matching unit connected via a first impedance converter to a second substrate with a transistor, and optionally a third substrate with another matching unit connected via a second impedance converter, allowing for reduced chip size and cost by redistributing impedance conversion tasks across substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the matching circuit is integrated on the semiconductor chip, then the impedance matching is achieved, but the chip size becomes large and cost increases
Solution Approach 1:
The matching circuit is divided into two parts: a first matching circuit integrated on the semiconductor chip and a second matching circuit formed on a separate substrate. This segmentation allows the chip size to be reduced while maintaining impedance matching functionality through the combined action of both matching circuits.
Solution Approach 2:
The matching circuit functionality is extended from a single-plane integration on the chip to a multi-dimensional configuration involving both the chip substrate and a separate mounting substrate. This dimensional extension enables impedance matching without constraining the chip area.
2Area of stationary object
If the matching circuit is formed on a separate substrate, then the chip size is reduced, but manufacturing variation increases
Solution Approach 1:
The first matching circuit is pre-designed and integrated on the semiconductor chip during chip fabrication, establishing a baseline impedance matching capability. The second matching circuit on the separate substrate is then designed to complement and fine-tune this pre-established matching, reducing sensitivity to manufacturing variations in wire and bump connections.
Solution Approach 2:
The first matching circuit on the chip acts as an intermediary between the transistor and the external connections, providing preliminary impedance transformation. This intermediary function reduces the burden on the second matching circuit and the connection elements, thereby reducing the overall sensitivity to manufacturing variations.
3Reliability
If expensive materials like GaN substrate are used, then the power amplifier performance is improved, but the cost increases
Solution Approach 1:
The system is segmented into a high-performance semiconductor chip (using expensive materials like GaN) and a separate mounting substrate (using lower-cost materials). This segmentation allows the expensive materials to be used only where high performance is critical (in the power amplifier transistor) while reducing overall cost by using cheaper materials for the matching circuits and substrate.
Solution Approach 2:
High-performance GaN material is used locally in the transistor region where power amplification is required, while the matching circuits on the separate substrate use lower-cost materials. This local quality differentiation optimizes performance where needed while controlling overall cost.
Data Source
AI summary
Provided is a high-frequency amplifier capable of making a circuit substrate small and reducing a cost. A high-frequency amplifier is provided with a first substrate including a matching unit, and a second substrate including a transistor and a first impedance converter connected to each other, in which the matching unit of the first substrate and the first impedance converter are connected to each other via a first connection. Furthermore, the high-frequency amplifier is further provided with a third substrate including a matching unit, in which the second substrate may further include a second impedance converter connected to the transistor, and the second impedance converter and the matching unit of the third substrate may be connected to each other via a second connection.