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Related Concept Videos

MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Small-Signal Analysis of MOSFET Amplifiers

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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Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Cascaded Op Amps01:16

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Biasing of Metal-Semiconductor Junctions

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

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Published on: August 5, 2013

Reduced transposed flicker noise in microwave oscillators using gaas-based feedforward amplifiers.

Jeremy K A Everard1, Carl D Broomfield

  • 1Department of Electronics, The University of York, Heslington, York, Y010 5DD, UK. jkae@ohm.york.ac.uk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|June 19, 2007
PubMed
Summary

This study demonstrates transposed flicker noise reduction in 7.6 GHz microwave oscillators using a GaAs feedforward amplifier. Significant noise suppression was achieved, improving oscillator performance for various applications.

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Area of Science:

  • Electrical Engineering
  • Physics
  • Materials Science

Background:

  • Microwave oscillators are crucial components in modern electronics.
  • Flicker noise (1/f noise) is a significant performance limitation in oscillators.
  • Existing noise reduction techniques often have limitations at specific offset frequencies.

Purpose of the Study:

  • To demonstrate transposed flicker noise reduction and removal in 7.6 GHz microwave oscillators.
  • To investigate the effectiveness of a GaAs-based feedforward power amplifier in noise suppression.
  • To analyze noise performance across different oscillator configurations.

Main Methods:

  • Utilized a GaAs-based feedforward power amplifier as the oscillation-sustaining stage.
  • Incorporated a limiter and resonator within the oscillator loop.
  • Built and tested three oscillator pairs: a transmission line feedback oscillator and two dielectric resonator oscillators (DROs).

Main Results:

  • Achieved 20 dB noise suppression at a 12.5 kHz offset frequency with the error correcting amplifier active.
  • Demonstrated phase noise roll-off at (1/f)^2 for offsets > 10 kHz in the transmission line oscillator.
  • Observed noise performance within 0-1 dB of theoretical minimum for the transmission line oscillator and 6-12 dB for DROs.

Conclusions:

  • Transposed flicker noise reduction is feasible in microwave oscillators using the described feedforward amplifier approach.
  • The implemented method significantly suppresses noise at offset frequencies greater than 10 kHz.
  • Further investigation is needed to fully understand the noise discrepancy in DROs compared to theoretical predictions.