Digital Phase Shifter Layout for Reflection-Induced Phase Uniformity
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Solution Overview
Problem
Digital phase shifters with cascaded configurations experience phase shift amount distributions due to weak reflections, particularly when bent using bend-type lines, which affect impedance matching and signal propagation.
Innovation Solution
Incorporating relay digital phase shift circuits and mitigation circuits with specific configurations, such as varying phase shift amounts and electronic switches, to mitigate phase shift distributions caused by weak reflections, and using capacitors and electronic switches to control delay modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital phase shift circuits are connected in cascade to achieve desired phase shift function, then phase shift precision is improved, but the length of the digital phase shifter increases
Solution Approach 1:
The patent applies bend-type connection units with bent structures to connect digital phase shift circuit groups, replacing straight line connections. This curvature approach shortens the overall length of the digital phase shifter while maintaining the cascade connection functionality needed for precise phase shifting, directly resolving the contradiction between precision and length.
2Length of moving object
If bend-type connection units are used to shorten the digital phase shifter length, then the length is reduced, but weak reflections occur causing distribution of phase shift amounts
Solution Approach 1:
The patent introduces relay digital phase shift circuits as intermediary elements between digital phase shift circuit groups connected by bend-type connection units. These relay circuits act as mediators that compensate for the weak reflections caused by the bent connections, maintaining phase shift uniformity while allowing the use of space-efficient bent structures.
Solution Approach 2:
The patent employs mitigation circuits that can dynamically adjust their phase shift amounts to compensate for reflections. By changing the phase shift parameters of these mitigation circuits based on detected reflection effects, the system maintains uniform phase shift distribution across all circuit groups despite the presence of bend-type connection units.
3Reliability
If relay digital phase shift circuits and mitigation circuits are added to compensate for reflections, then phase shift uniformity is improved, but device complexity increases
Solution Approach 1:
The relay digital phase shift circuits serve multiple functions: they extend the phase shifting capability, compensate for reflections from bend-type connections, and maintain impedance matching. This multi-functionality reduces the need for separate dedicated compensation circuits, thereby limiting the increase in overall device complexity while achieving improved phase shift uniformity.
Data Source
AI summary
A digital phase shifter includes a plurality of digital phase shift circuit groups in which a plurality of digital phase shift circuits are connected in cascade, one or more relay digital phase shift circuits (digital phase shift circuits) provided between two digital phase shift circuit groups, and two or more bend-type connection units configured to connect one of the two digital phase shift circuit group and the relay digital phase shift circuit and connect the other of the two digital phase shift circuit groups and the relay digital phase shift circuit. At least one of the digital phase shift circuits constituting at least one digital phase shift circuit group and the relay digital phase shift circuit is a mitigation circuit that mitigates the distribution of phase shift amounts.