C-Band Limiting Amplifier Design and Implementation

Please enable javascript in your browser.

Zamani, Kaveh | 2010

628 Viewed

Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40695 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Banai, Ali
Abstract:
In an operational IFM receiver, there is usually a limiting amplifier in front of the power divider, delay line, and phase correlator. The limiting amplifier can improve the sensitivity of the receiver by providing RF gain to process weak input signals. In general, a signal must reach the limiting level in order to be processed by the receiver. It is important to notice that a limiting amplifier can be used only at the input of an IFM receiver. It should not be used in other kinds of receivers because the limiting amplifier will generate intermodulation products when overlapping signals are present. Since an IFM receiver only reads one signal at a time, the limiting amplifier will not disturb the performance of the receiver but will improve it. A limiting amplifier expresses a capture effect on simultaneous signals. If two simultaneous signals are present at the input o the amplifier, a strong one and a weak one, the limiter will suppress the weak one more than the strong one. In other words the strong signal captures the weak signal. This thesis is about design and implementation of a C-band limiting amplifier. This limiting amplifier consists of balanced amplifiers and limiters with low second harmonic.
Keywords:
Capture Effect ; Limiting Amplifier ; Limiter ; Wideband Amplifier ; Balanced Amplifier