Multi-Path RF Amplifier Phase Matching Across Gain Modes
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Solution Overview
Problem
Existing RF front-end designs face challenges in maintaining minimal phase discontinuity between different gain modes, particularly between active and passive modes, while adhering to stringent performance requirements and minimizing circuit size and complexity.
Innovation Solution
Implementing configurable phase shifters in both active and passive paths of a multi-path RF front-end, with phase shifts designed to ensure that output signals from different gain modes are substantially in phase, and sharing the phase shift task between these paths to minimize overall circuit size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If different paths are used for different gain modes, then power consumption is reduced in low current modes, but phase shift difference between modes increases
Solution Approach 1:
A phase shifter is introduced as an intermediary component in the low current gain path to compensate for the phase shift difference between the wideband high current path and the narrowband low current path. The phase shifter adjusts the phase of the signal in the low current path to match the phase of the wideband path, thereby reducing phase discontinuity while maintaining power savings.
Solution Approach 2:
The phase shift introduced by the phase shifter is optimized based on the operating frequency range. The phase shifter parameters are designed to provide appropriate phase compensation across the operating bandwidth, allowing the system to maintain minimal phase difference between gain modes while operating in power-saving modes.
2Manufacturing precision
If phase shift matching is implemented between gain modes, then phase discontinuity is reduced, but device complexity increases
Solution Approach 1:
The phase shifter is integrated into the existing low current gain path circuitry, merging the phase adjustment function with the gain control function. This integration approach reduces the overall device complexity by sharing common components and circuit elements between the phase shifting and gain control functions.
Solution Approach 2:
The phase shifter is designed to work effectively across different operating conditions and frequency ranges, serving multiple functions including phase compensation, bandwidth adjustment, and gain mode transition optimization. This multi-functionality reduces the need for separate dedicated components for each function.
3Manufacturing precision
If phase shifters are added to both paths, then phase matching is improved, but device size increases
Solution Approach 1:
Instead of adding phase shifters to both paths, the solution extracts the phase adjustment requirement to only the low current gain path. The wideband high current path serves as the reference path with minimal phase shift, and only the low current path requires active phase compensation, thereby reducing the overall device footprint.
Solution Approach 2:
The phase matching is achieved by applying phase compensation only partially - specifically in the low current gain path where it is most needed. This partial action approach avoids the excessive complexity and size that would result from implementing phase shifters in both paths, while still achieving the required phase matching performance.
Data Source
AI summary
Methods and devices to minimize or reduce phase discontinuity between different gain modes (including bypass, active and passive modes) with reduced increase in circuit size (footprint or number of components) and complexity, without impacting other performance parameters, are disclosed. Phase shifter elements that can be disposed in both the active and passive bypass paths are also described. Moreover, devices using the same reconfigurable phase shifter elements in both active and bypass modes are described. Components of the phase shifters can also perform output matching when the phase shifters are implemented as part of an RF receiver front-end.