Showing papers by "Alessandro Trifiletti published in 1995"
17 Mar 1995
TL;DR: In this article, a P-I-N photodiode and two amplifiers, each one amplifying the current furnished by a lead of the photodiod, are used to increase the sensitivity of the optical receiver by 3 dB and the output level by 6 dB.
Abstract: A new differential topology of optical receiver which is based on a differential sensing of the output current of the photodiode is presented in this paper. The receiver proposed here is made by a P-I-N photodiode and two amplifiers, each one amplifies the current furnished by a lead of the photodiode. It is intended for digital transmission systems which require a low-pass type response. By adopting a wide band transimpedance amplifier, this topology can increase the sensitivity of the optical receiver by 3 dB as well as the output level which is increased by 6 dB, and therefore reduces the gain requirement to the transimpedance amplifier and to the main amplifier.
1 citations
22 Feb 1995
TL;DR: In this article, the authors compare GaAs monolithic processes regarding the requirement of transimpedance amplifiers to be used in optical front-ends using a lumped element model of the forward amplifier.
Abstract: The following technique compares GaAs monolithic processes regarding the requirement of transimpedance amplifiers to be used in optical front-ends. This technique uses a lumped element model of the forward amplifier to establish relationships between the small signal model of the devices which form the forward amplifier and the closed loop performance, as well as the root locus representation of the loop gain transfer function to set clear constraints to the frequency response. The comparison is performed by establishing a set of constraints to ensure the effectiveness of solution found and to reduce the number of degrees of freedom in this problem. This comparison has been carried out by taking into consideration the presence of the parasitic capacitance of the photodiode which plays an important role in the bandwidth performance.
22 Feb 1995
TL;DR: In this paper, the authors proposed two design approaches based on noise matching and on power matching, as well as a performance evaluation criterion to make comparisons between these different techniques, and found the limit of noise performance of the approaches at a single frequency, and an upper bound, derived from the Bode-Fano limit, in a wideband application for the power matching approach.
Abstract: The performance of bandpass optical receivers can be improved using a lossless equalizer between the photodiode and the amplifier, as a consequence of the mismatch between the source and the input section of the amplifier. We propose two design approaches based on noise matching and on power matching, as well as a performance evaluation criterion to make comparisons between these different techniques. We have found the limit of noise performance of the approaches at a single frequency, and an upper bound, derived from the Bode-Fano limit, in a wide-band application for the power matching approach.