Abstract
The transimpedance amplifier is realized in a 0.18μm CMOS technology. The TIA uses a shunt-shunt feedback topology, differential TIA because it reaches a higher bandwidth than a conventional one. The TIA also has a variable gain to increase the bandwidth of theamplifier . The TIA has a maximum gain of 73 dBΩ, bandwidth 3.1GHZ, bit rate 5Gb/s and input-referred current noise of 5 pA/√Hz. Eyejitter at bit rate 5Gb/s equal to 5ps (peak to peak). Keywords:transimpedance amplifier (TIA) , Berkeley Short Channel Igfet model (BSIM model) , Advanced design system (ADS) .
Highlights
In an optical communication system, optoelectronic receiver, which consists of a photo detector and a trans impedance amplifier, is used to convert the optical signals into electrical signals in the front end
As the feature size getting smaller, CMOS technologies begin to take an important role in high performance and high speed ICs
The system presented in this paper is shown in Figure (5) using double balanced photo diode and three stage differential trans impedance amplifier .The differential trans impedance amplifier is chosen because its complementary outputs of the trans impedance amplifier stage allows a differential interface to the following differential main amplifier stage, which is advantageous at high speed data rates
Summary
In an optical communication system, optoelectronic receiver, which consists of a photo detector and a trans impedance amplifier, is used to convert the optical signals into electrical signals in the front end. Figure (1) shows the system block diagram of optical fiber communication [1]. Optic-fiber networks are widely implemented and the data speeds of the systems get higher and higher. Ultra-high speed ICs for different systems is needed. The simulated unity current gain cut off frequency (fT) of the above sub-micron CMOS technologies are 13.5-, 18.6-, and 49-GHz, respectively. A transistor can be operated at the frequency of fT/10. These submicron CMOS technologies can be used in the ICs with upper frequencies of 1.35-, 1.86-, and 4.9-GHz, respectively. 1-Hz frequency band can carries approximately 2 bit data, resulting in the highest bit rates of >2.5-, >3.5-, and ≈10 Gb/s for three sub-micron CMOS technologies [2]
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