Design of a variable gain CMOS transmission impedance amplifier for optical receiver amplifier
Subject Areas : Electronics Engineering
Mehdi Faraji
1
(Member of Young Researchers Club - Islamic Azad University, Najafabad Branch, Isfahan, Iran)
Ebrahim Borzabadi
2
(Faculty of Electrical Engineering, Islamic Azad University, Najafabad Branch, Isfahan, Iran)
Hossein Pourghasem
3
(Faculty of Electrical Engineering, Islamic Azad University, Najafabad Branch, Isfahan, Iran)
Keywords:
Abstract :
In this paper, the design and simulation of a transmission impedance amplifier using 0.18 µ CMOS technology for use in the amplifier section of optical telecommunication receivers are presented. The idea presented in this paper is based on the use of a parallel-parallel feedback structure with a cascade interest rate. This structure is quasi-differential and is designed to increase the allowable range of input power and prevent amplifier saturation, a circuit with a variable gain. The simulation results show a maximum gain of 64 dB, a bandwidth of 1.8 GHz, power consumption of 20mw, and a spectral intensity of the noise current referred to as the PA / 9 input. Also, by using variable gain control, the gain of the amplifier transmission impedance can be reduced to 46 dBΩ. The results indicate that the proposed design is very suitable for a 2.5 Gb / s optical telecommunication system.
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