A Novel Technique for Improvement of Power Supply Rejection Ratio in Amplifer Circuits

Author

Gupta, Vivek ; Gupta, Anu ; Chaturvedi, Nitin ; Asati, Abhijit

Author_Institution

Electr. & Electron. Group, Birla Inst. of Technol. & Sci., Pilani, India

fYear

2009

fDate

28-29 Dec. 2009

Firstpage

756

Lastpage

758

Abstract

Most of the time, power supplies fail to provide a constant voltage supply and some external voltage signal may override on the power supply giving unwanted fluctuation at the output node. This paper discusses 3 techniques to improve the power supply rejection ratio (PSRR) in amplifier circuits. (1) Cascoding technique - cascoding increases the gain from input node to output node giving high PSRR values at low frequency. (2) Feedback technique - a negative feedback in circuits generally improves PSRR since it ensures that output follows the input signal and any other external disturbance is rejected. (3) Designing an additional circuit which could nullify the effect of the voltage gain from the power supply to the output node.

Keywords

amplifiers; circuit feedback; power supply circuits; PSRR; amplifier circuits; cascoding technique; negative feedback technique; power supply rejection ratio; voltage fluctuation; voltage gain; Circuit noise; Circuit simulation; Feedback circuits; Fluctuations; Frequency; Negative feedback; Power amplifiers; Power supplies; Transconductance; Voltage; Common source amplifier; PSRR; cascoding; negative feedback;

fLanguage

English

Publisher

ieee

Conference_Titel

Advances in Computing, Control, & Telecommunication Technologies, 2009. ACT '09. International Conference on

Conference_Location

Trivandrum, Kerala

Print_ISBN

978-1-4244-5321-4

Electronic_ISBN

978-0-7695-3915-7

Type

conf

DOI

10.1109/ACT.2009.191

Filename

5375827