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Design of multi-frequency point, high-isolation switches for micro-channel plate data acquisition
Yihao Yang1,2, Yongsheng Gou1,2, Yang Yang1,2
1Universiy of Chinese Academy of Sciences, Beijing, China.
The Review of Scientific Instruments
|October 25, 2023
Summary
This study designed a high-isolation Radio Frequency (RF) switch using Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) to replace phosphor screens in x-ray cameras. The novel design minimizes signal feedthrough and ensures signal integrity for improved camera readout circuits.
Area of Science:
- Electrical Engineering
- Physics
- Instrumentation
Background:
- Phosphor screens in proximity-gated x-ray framing cameras present limitations for advanced readout.
- Integrating time-interleaved readout circuits requires high-performance switching components.
Purpose of the Study:
- To design a high-isolation Radio Frequency (RF) switch capable of replacing phosphor screens in x-ray framing cameras.
- To address signal feedthrough issues caused by parasitic capacitance in Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) switching circuits.
Main Methods:
- A Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) switching circuit was designed for operation between 0.5-3 GHz.
- Parallel resonance was employed to enhance voltage division for high isolation.
- Series resonance was utilized to effectively leak current, further improving isolation.
Main Results:
- The designed RF switch achieved 76 dB isolation and 0.07 dB insertion loss at 1 GHz.
- Isolation exceeding 33 dB was maintained across the 0.5-3 GHz frequency range.
- The circuit effectively mitigated signal feedthrough caused by MOSFET parasitic capacitance.
Conclusions:
- The developed high-isolation RF switch effectively overcomes limitations of traditional phosphor screens in x-ray cameras.
- The resonant circuit design ensures reliable signal transmission and high isolation for time-interleaved readout applications.
- This advancement facilitates the integration of modern readout electronics with x-ray imaging systems.
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