Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop

In this paper, a variable gain amplifier (VGA) designed in 130 nm CMOS technology is presented. The proposed amplifier is based on the bulk-driven (BD) design approach, which brings a possibility to operate with low supply voltage. Since the supply voltage of only 0.6 V is used for the amplifier to operate, there is no risk of latch-up event that usually represents the main drawback of the BD circuit systems. BD transistors are employed in the input differential stage, which makes it possible to operate in rail-to-rail input voltage range. Achieved simulation results indicate that gain of the proposed VGA can be varied in a wide scale, which together with the low supply voltage feature make the proposed amplifier useful for low-voltage and low-power applications. An additional circuit responsible for maintaining the linear-in-decibel gain dependency of the VGA is also addressed. The proposed circuit block avails arbitrary shaping of the curve characterizing the gain versus the controlling voltage dependency.

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Study of Small-signal Model of Simple CMOS Amplifier with Instability Compensation of Positive Feedback Loop

Cited by 2 publications

References 29 publications

0.5 V Variable Gain Amplifier Using Dynamic Threshold MOS for Ultra-Low Power Applications

0.5 V Variable Gain Amplifier Using Dynamic Threshold MOS for Ultra-Low Power Applications

130 nm CMOS Bulk-Driven Variable Gain Amplifier for Low-Voltage Applications

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