Switchable Chireix LINC Transmitter for Phase-Range Matching
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Solution Overview
Problem
Existing transmitter circuits face challenges in power efficiency due to bandwidth expansion and matching requirements when using switching power amplifiers, particularly in linear amplification with non-linear components (LINC) architectures, which lead to increased power consumption and complexity.
Innovation Solution
The use of multiple Chireix compensation circuits, each tailored to process signals within specific phase ranges, coupled with adaptive switching mechanisms to ensure efficient processing and consistent output, reduces power consumption and bandwidth expansion by optimizing the handling of in-phase and quadrature signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If switching power amplifiers are used in LINC architectures to improve power efficiency, then power consumption is reduced, but bandwidth expansion and matching requirements increase device complexity
Solution Approach 1:
The invention divides the signal processing into separate in-phase and quadrature branches, each with dedicated switching power amplifiers and Chireix compensation circuits. This segmentation allows independent optimization of each branch for power efficiency while managing bandwidth expansion through structured signal decomposition into constant envelope components
Solution Approach 2:
The invention transforms the variable envelope signal into constant envelope signals through LINC decomposition, enabling the use of switching power amplifiers operated in highly efficient nonlinear regions. Chireix compensation circuits then adjust impedance parameters to maintain power combining efficiency across varying signal conditions
2Use of energy by moving object
If Chireix compensation circuits are added to improve power efficiency in LINC transmitters, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The invention combines Chireix compensation circuits with the existing LINC architecture branches, integrating impedance compensation functionality into the signal path without requiring completely separate compensation systems. This merging approach achieves power efficiency improvements while limiting the increase in overall device complexity
Data Source
AI summary
A transmitter (200) comprises a first Chireix compensation circuit (230, 232, 238, 240) and a second Chireix compensation circuit (234, 236, 238, 240), wherein each Chireix compensation circuit has two inputs and two outputs. Two constant envelope input signals (22, 224) to be amplified are guided by a switch (226) to either the first or second Chireix amplifier unit. The selection as such depends on the phase (212) of the input signals to be amplified. The outputs of the two Chireix compensation circuits are cross-coupled to an inductive load (242). A Chireix inductor (238) and a Chireix capacitor (240), each having one terminal grounded, are also connected to the inductive load (242). By switching the signals to be amplified in response to their phase, optimum matching is ensured.