Design of common source amplifier with resistive load and diode load with gain comparison

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Abstract

This paper investigates the performance disparity between resistive and diode loads in a Common Source Amplifier (CSA) designed via Cadence Virtuoso software utilizing UMC 90nm technology. The aim was to compare the gain characteristics of the CSA employing these two distinct loads under identical design specifications and operating conditions at a frequency of 100MHz with a 1.8V power supply. The designed CSA circuit incorporated both resistive and diode loads, intending to evaluate their respective gains. Surprisingly, the resistive load exhibited a higher gain of 19.11dB, whereas the diode load demonstrated a lower gain of 15.7dB, despite adhering to the same design methodology and specifications. The discrepancy in gains between the two load types warrants further investigation into the underlying reasons behind this observation. This study serves to highlight the nuanced impact of load selection on the gain performance of a Common Source Amplifier, providing valuable insights into load-dependent variations and their implications for amplifier design and performance optimization.

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Keywords

Common source amplifier, Resistive load, Diode load, cadence virtuoso, gain