Design, analysis and simulation of a linear phase matrix distributed amplifier

Document Type : Research Paper

Authors

1 Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran

2 School of Electrical and computer Engineering,College of Engineering, University of Tehran,Tehran, Iran

Abstract

In this paper, a new method for the design of a linear phase matrix distributed amplifier in 180nm CMOS technology is introduced. This approach is particularly intended for high-speed optical and wideband receivers where signal integrity is critical. The method is based on the analogy between a distributed amplifier and a transversal filter. However, to overcome the limitations of CMOS compared to HEMT technology, this design incorporates delay adjustments alongside gain control. In the proposed method, the phase linearity in the frequency range of 0-50GHz is obtained by proper weighting of the gain for each cascaded amplifier stage and tuning the delay of the gate, drain, and middle transmission lines. The weight for each gain cell is obtained using MATLAB software. The frequency response obtained by MATLAB and also the one obtained by ADS software show the phase linearity of the designed amplifier. Simulation results demonstrate a flat gain of 12 dB, constant group delay, and input/output return losses better than -9.5 dB and -8.2 dB, respectively.

Keywords

Journal of Communication Engineering

Articles in Press, Accepted Manuscript
Available Online from 31 May 2026

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