Phase Shifter Compensation Circuit for Low-Loss Phase Accuracy
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Solution Overview
Problem
The phase accuracy of phase-shifted signals in phase shifters with multiple stages of polyphase filters improves but results in increased power loss, necessitating a solution that compensates for phase errors without increasing the number of polyphase filter stages.
Innovation Solution
A phase shifter design incorporating a 90-degree distributor and phase shift circuits with compensation circuits that adjust and synthesize signals across different frequency bands to minimize phase errors, allowing for phase error compensation without increasing the number of polyphase filter stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of stages of polyphase filters is increased, then phase accuracy is improved, but power loss increases
Solution Approach 1:
The frequency band is segmented into multiple sub-bands, with different numbers of polyphase filter stages applied to different sub-bands. This allows phase accuracy to be optimized for each frequency range without uniformly increasing the number of stages across the entire band, thereby reducing overall power loss.
Solution Approach 2:
Different configurations of polyphase filters are applied to different frequency sub-bands according to their specific requirements. High-phase-accuracy regions receive more filter stages while regions with lower requirements use fewer stages, optimizing the balance between phase accuracy and power loss locally.
2Measurement precision
If the number of stages of polyphase filters is increased, then phase error reduction is achieved, but device complexity increases
Solution Approach 1:
The polyphase filter structure is segmented into multiple independent stages that can be selectively activated. By dividing the filter into modular stages, the system achieves high phase accuracy when needed while avoiding the complexity of a single large-scale multi-stage filter.
Solution Approach 2:
The number of active polyphase filter stages is dynamically adjusted based on the operating frequency and phase accuracy requirements. This dynamic configuration allows the system to maintain high phase accuracy when necessary while reducing device complexity by deactivating unnecessary stages under normal operating conditions.
Data Source
AI summary
A first phase shift circuit amplifies, when a first signal, a second signal having a phase difference of 90 degrees from the first signal, a third signal having a phase difference of 180 degrees from the first signal, and a fourth signal having a phase difference of 270 degrees from the first signal are output from a 90-degree distributor that distributes an input signal, each of any three signals from among the first signal to the fourth signal. A second phase shift circuit amplifies each of any two signals of any three signals and one signal that is not amplified by the first phase shift circuit from among the first signal to the fourth signal. One or more phase shift circuits of the first phase shift circuit and the second phase shift circuit each include a compensation circuit that compensates for a phase error of the synthesized signal.