Doherty TRX Interface Using Shared EM Structure to Save Circuit Area
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Solution Overview
Problem
Doherty power amplifiers in wireless communication devices face challenges with large circuit area consumption due to input and output circuitry, which compromises their efficiency and design tradeoffs in millimeter-wave communication systems.
Innovation Solution
An electromagnetic (EM) structure is integrated with a main power amplifier and an auxiliary power amplifier to minimize circuit area size, which includes a main power amplifier, an auxiliary power amplifier, a low noise amplifier, and a port connected through an electromagnetic structure with selectively coupled capacitances, facilitating efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a Doherty power amplifier is implemented with separate input and output circuitry for main and auxiliary PAs, then power added efficiency is improved at back off power levels, but circuit area consumption increases
Solution Approach 1:
The patent combines the input and output circuitry of the main PA and auxiliary PA into a shared electromagnetic structure. The main PA and auxiliary PA share common input terminals and output terminals, eliminating the need for separate input and output matching networks. This merging reduces the overall circuit area while maintaining the power added efficiency benefits of Doherty operation through shared reactive elements and compact layout.
2Reliability
If separate input and output circuitry is provided for main and auxiliary PAs, then impedance matching and power transfer are optimized, but device complexity increases
Solution Approach 1:
The electromagnetic structure serves multiple functions simultaneously: it acts as the input matching network for both main and auxiliary PAs, the output matching network for both PAs, and provides the coupling mechanism between the PAs and the power combiner. This multi-functional design reduces the number of discrete components and simplifies the overall circuit architecture while maintaining proper impedance matching across all ports.
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 EM structure minimizes circuit area while maintaining efficient coupling and signal transmission, addressing the area consumption issue in Doherty power amplifiers.
Implementation Method 1
conveying communication signals between a main power amplifier (PA) and an auxiliary PA of a Doherty power amplifier and an antenna port through an electromagnetic (EM) structure
Implementation Method 2
capacitances selectively coupled to an output of the main PA and to an output of the aux PA, respectively
Data Source
AI summary
An apparatus includes a main power amplifier (PA) and an auxiliary PA of a Doherty power amplifier coupled to an electromagnetic (EM) structure having a plurality of branches, capacitances selectively coupled to an output of the main PA and to an output of the aux PA, respectively, a low noise amplifier (LNA) coupled to the EM structure, and a port comprising an antenna interface coupled to the EM structure.