Doherty Amplifier Stacked Substrate Layout for Heat and Density
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Solution Overview
Problem
High-frequency amplifiers face challenges in reducing size while maintaining heat dissipation properties, as traditional two-dimensional mounting methods are inefficient for large power consumption and heat generation, and three-dimensional mounting can deteriorate heat dissipation.
Innovation Solution
A high-frequency amplifier design utilizing a two-level structure with multilayer substrates and a base member for mounting driver, carrier, and peak amplifiers, where the driver amplifier is supported by a heat dissipation path and the carrier and peak amplifiers are in contact with the base member for enhanced heat dissipation, reducing size and increasing packaging density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If three-dimensional mounting is used to reduce size, then packaging density is improved, but heat dissipation properties deteriorate
Solution Approach 1:
The patent transitions from two-dimensional mounting to three-dimensional mounting by stacking multiple substrates vertically. The driver amplifier is mounted on the second substrate while carrier and peak amplifiers are mounted on the first substrate, utilizing the vertical dimension to increase packaging density without compromising heat dissipation when proper thermal pathways are provided.
Solution Approach 2:
The patent introduces a heat dissipation path as an intermediary thermal pathway between the driver amplifier on the second substrate and the base member. This mediator enables efficient heat transfer from elevated components to the cooling base, resolving the contradiction between vertical mounting and heat dissipation.
2Temperature
If two-dimensional mounting is used, then heat dissipation properties are maintained, but size reduction is limited
Solution Approach 1:
The patent employs multi-substrate stacking to utilize the vertical dimension for component placement. By mounting different amplifier components on different substrates at different heights, the design achieves compact footprint while maintaining thermal performance through dedicated heat dissipation pathways.
Solution Approach 2:
The patent divides the amplifier system into separate functional modules mounted on different substrates. The driver amplifier is segregated on the second substrate while carrier and peak amplifiers are on the first substrate, allowing independent thermal management for each segment.
3Reliability
If wire-bonding connections are used, then electrical connectivity is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the mechanical wire-bonding system with direct electrical connections through conductive pathways embedded in the substrate structure. This substitution eliminates the need for separate wire bonding operations, reducing manufacturing complexity and cost while maintaining reliable electrical connectivity.
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 design achieves a compact size with improved heat dissipation properties, reducing power consumption and maintaining high-frequency performance, while eliminating the need for wire-bonding connections and allowing for cost-effective manufacturing.
Implementation Method 1
the other end of the first via is connected to the base member
Implementation Method 2
the back surface of the driver amplifier is connected to an interconnect layer disposed on a surface of the second multilayer substrate
Data Source
AI summary
A high-frequency amplifier includes a driver amplifier, a Doherty amplifier including carrier and peak which amplify the driver amplifier output, a second substrate laminated on a first substrate, and a base member mounted with the first and second substrates. The driver amplifier is mounted on the second substrate, and the carrier and peak amplifiers are mounted on the first substrate. A front surface of the driver amplifier opposes the first substrate, and a back surface of the driver amplifier is separated from the first substrate. Back surfaces of the carrier and peak amplifiers contact the base member, and the back surface of the driver amplifier connects to an interconnect layer disposed on the second substrate and connected to one end of a via penetrating the second and first substrates, and the other end of the via connects to the base member.