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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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Frequency-Offset Cartesian Feedback Based on Polyphase Difference Amplifiers.

Marta G Zanchi1, John M Pauly, Greig C Scott

  • 1Electrical Engineering Department, Stanford University, Stanford, CA 94305 USA. (phone: 650-723-1904; fax: 650-723-8473; mgzanchi@stanford.edu ).

IEEE Transactions on Microwave Theory and Techniques
|September 4, 2010
PubMed
Summary
This summary is machine-generated.

A new frequency-offset Cartesian feedback method using polyphase difference amplifiers significantly reduces errors in power amplifier control systems. This technique improves performance by comparing signals at an intermediate frequency, avoiding DC-related issues and enhancing magnetic resonance imaging systems.

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • RF Engineering

Background:

  • Classic Cartesian feedback systems for power amplifiers suffer from quadrature errors and DC-offsets.
  • These errors degrade performance and limit the accuracy of control systems.

Purpose of the Study:

  • To introduce a modified Cartesian feedback method, termed frequency-offset Cartesian feedback (FOCF).
  • To significantly reduce quadrature errors and DC-offsets in power amplifier control.
  • To demonstrate the effectiveness of FOCF through simulations and experimental prototypes.

Main Methods:

  • Implementing FOCF by down-converting reference and feedback signals to a low intermediate frequency (IF).
  • Utilizing polyphase difference amplifiers to create a complex control bandwidth centered at the IF, offset from DC.
  • Analyzing the behavior of polyphase difference amplifiers via theoretical analysis, simulations, and experimental validation.

Main Results:

  • FOCF effectively mitigates DC-offsets and quadrature mismatch errors by shifting the control bandwidth away from DC.
  • The loop gain peak is positioned away from DC, preventing errors from voltage offsets, drift, and local oscillator leakage.
  • Experimental results from a prototype transmitter validate the performance improvements.

Conclusions:

  • Frequency-offset Cartesian feedback offers a robust solution for power amplifier control, overcoming limitations of traditional methods.
  • The use of polyphase difference amplifiers is key to achieving enhanced performance and error reduction.
  • This approach is particularly beneficial for applications like magnetic resonance imaging (MRI) transmit array systems.