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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
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Analysis and Implementation of Controlled Semiconductor Switch for Ultra-Wideband Radar Sensor Applications.

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This study presents a novel high-frequency semiconductor integrated switch for ultra-wideband (UWB) sensor applications. The designed switch offers excellent bandwidth and isolation, meeting critical requirements for UWB systems.

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Area of Science:

  • Electrical Engineering
  • Microwave Engineering
  • Semiconductor Devices

Background:

  • Ultra-wideband (UWB) sensor applications necessitate specialized hardware for high-frequency signal switching.
  • Integration trends in Systems on Chip (SoC) and Systems in Package (SiP) drive the need for compact, high-performance switches.
  • High-frequency signal switching is crucial for telecommunications and laboratory instrumentation.

Purpose of the Study:

  • To design and analyze a high-frequency semiconductor integrated switch specifically for UWB applications.
  • To achieve high integration using NMOS transistors and optimize performance through precise circuit and layout design.
  • To develop a switch suitable for UWB sensor systems, including antenna MIMO configuration and calibration tool switching.

Main Methods:

  • Designed a high-frequency semiconductor integrated switch using NMOS transistors and CMOS logic control.
  • Implemented the switch design in low-cost 0.35 µm SiGe BiCMOS technology.
  • Conducted circuit simulations, layout creation, and post-layout simulations including parasitic extraction.
  • Fabricated the chip and measured its parameters.

Main Results:

  • The fabricated UWB switch operates with a supply current of 2 mA at 3.3 V.
  • Achieved a bandwidth of 6 GHz and an insertion loss of -2.2 dB at 1 GHz.
  • Demonstrated isolation of -33 dB at 1 GHz.
  • The measured parameters satisfy the requirements for UWB sensor applications.

Conclusions:

  • The designed and fabricated high-frequency semiconductor integrated switch is suitable for UWB sensor applications.
  • The use of NMOS transistors and optimized design compensated for frequency limitations.
  • The SiGe BiCMOS technology enabled the integration of the switch with other UWB system components.