Broadband Phase Shifter with Multi-Impedance Units
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Solution Overview
Problem
Traditional phase shifters face challenges in maintaining low RMS phase error and RMS gain error across a wide frequency band, making it difficult to apply them to broadband communication frequencies such as 28 GHz and 39 GHz.
Innovation Solution
The design incorporates a phase shifting unit with a specific configuration of switches, capacitors, inductors, and resistors, where the first switch and second switch are NMOS transistors, and the control voltages are reverse voltages of each other, allowing for controlled phase shifting and reduced insertion loss variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional 5 bits switching type phase shifter is used, then 32 different phase states can be formed, but it is quite difficult to maintain low RMS phase error and low RMS gain error throughout the frequency band
Solution Approach 1:
The phase shifter is divided into multiple independent phase shifting units (first, second, third, fourth units), each contributing a specific phase shift range. This segmentation allows the overall phase shift to be achieved through combination of smaller units, improving control precision and reducing cumulative errors across the frequency band.
Solution Approach 2:
The phase shifter employs dynamic switching mechanisms where control signals dynamically adjust the state of each phase shifting unit. This dynamic control enables precise phase adjustment and compensation across different frequencies, maintaining low RMS phase error and gain error throughout the broadband range.
2Adaptability or versatility
If the phase shifter is designed for wide frequency band coverage, then broadband application is enabled, but maintaining low RMS phase error and RMS gain error throughout the frequency band becomes challenging
Solution Approach 1:
The phase shifter design integrates multiple phase shifting units with different characteristic impedance values (50Ω, 75Ω, 100Ω, 150Ω) that can handle different frequency ranges. This multi-functional design allows the same device to operate effectively across a wide frequency band from sub-6GHz to millimeter wave frequencies, maintaining performance consistency throughout.
Solution Approach 2:
The phase shifter uses composite transmission line structures combining different impedance characteristics and phase shifting mechanisms. This composite approach enables the device to maintain consistent phase and gain performance across diverse frequency conditions, achieving both broadband coverage and low error metrics.
3Adaptability or versatility
If multiple phase shifting units with different impedances are used, then broadband performance is improved, but the device complexity increases
Solution Approach 1:
Multiple phase shifting units with different impedance characteristics are merged into a single integrated phase shifter device. The units are combined in a systematic arrangement where each unit handles specific frequency ranges, achieving broadband performance while consolidating functionality into one device rather than requiring separate components.
Solution Approach 2:
The design transitions from single-impedance to multi-impedance dimensions by incorporating units with 50Ω, 75Ω, 100Ω, and 150Ω characteristics. This dimensional expansion in impedance space enables broadband operation without proportionally increasing physical complexity, as each impedance unit serves a specific frequency purpose.
Data Source
AI summary
A phase shifter with broadband and a phase array module using the same are provided. The phase shifter includes at least one phase shifting unit. The phase shifting unit includes a first switch, a first capacitor, a second capacitor, a first inductor, a second switch, a second inductor, a first resistor and a second resistor. The first capacitor is connected between the first inductor and a second end of the first switch. The second capacitor is connected between the first inductor and a third end of the first switch. A second end of the second switch is connected to a ground end. The two ends of the second inductor are respectively connected to a ground end and a third end of the second switch. The first inductor is connected between the first capacitor and the third end of the second switch.