RF Multiplexer Resonator Layout for Tx/Rx Filter Optimization
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Solution Overview
Problem
Conventional RF multiplexers face design flexibility limitations due to resonators being fabricated on separate chips, making it difficult to optimize them for specific functions such as skirt steepness and counter band reflection.
Innovation Solution
The RF multiplexer circuit incorporates send and receive circuits with RF filters, where portions of both circuits are disposed on a single monocrystalline substrate, allowing resonators with different functionalities to be manufactured together and optimized independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resonators are fabricated on separate chips for Tx and Rx filters, then manufacturing simplicity is maintained, but design flexibility and performance optimization are limited
Solution Approach 1:
The patent segments the resonator fabrication into two groups: those disposed on the first substrate (Tx filter resonators) and those disposed on the second substrate (Rx filter resonators). This segmentation allows independent optimization of each filter path while maintaining separate manufacturing processes, resolving the contradiction between design flexibility and device complexity.
Solution Approach 2:
The patent extracts the resonators from a unified chip structure and separates them onto different substrates according to their functional requirements. This extraction enables each resonator group to be independently designed and optimized for its specific function (Tx or Rx) without being constrained by a common chip architecture.
2Manufacturing precision
If all resonators are fabricated on one chip, then device complexity is reduced, but optimization for specific functions such as skirt steepness and counter band reflection becomes difficult
Solution Approach 1:
The patent applies local quality by configuring resonators with different characteristics in different locations: Tx filter resonators on the first substrate are optimized for send path requirements (skirt steepness), while Rx filter resonators on the second substrate are optimized for receive path requirements (counter band reflection). This local optimization resolves the contradiction between manufacturing precision and device complexity.
3Manufacturing precision
If resonators are optimized for specific functions with different layer stacks, then filter performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the manufacturing process into two independent lines: one for fabricating resonators on the first substrate with layer stacks optimized for Tx filter performance, and another for fabricating resonators on the second substrate with layer stacks optimized for Rx filter performance. This segmentation allows each manufacturing line to be specialized and optimized independently, resolving the contradiction between manufacturing precision and ease of manufacture.
Data Source
AI summary
A radio frequency multiplexer (210, 220, 230) comprises send and receive circuits each including a RF filter circuit (211, 212, 221, 227, 231, . . . , 234). The send and receive circuits are coupled to an antenna port (225, 245) and corresponding send and receive ports (221, 222). A portion of the send circuit and a portion of the receive circuit are disposed on a single die (213, 226, 250). The layer stacks of the resonators of the send and receive circuits disposed on the single die can be optimized for the required functionality.