Low Power High Gain Op-Amp using Square Root based Current Generator

1
D. Anitha
D. Anitha
2
K. Manjunatha Chari
K. Manjunatha Chari
3
K. Vijaya Krishna
K. Vijaya Krishna
4
P. Satish Kumar
P. Satish Kumar
1 GITAM University

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A very high gain two stage CMOS operational amplifier has been presented. The proposed circuit is implemented in 180nm CMOS technology with a supply voltage of ±0.65V. The current source in the OPAMP is replaced by a square root based current generator which helps to reduce the impact of process variations on the circuit and low power consumption due to the operation of MOS in subthreshold region. So with the help of square root based current generator the better controllability over gain can be obtained. The proposed opamp shows a high gain of 121.9dB and low power consumption of 11.89uW is achieved.

7 Cites in Articles

References

  1. Prateek Vajpayee,; Anand,M Pappu (2014). An ultra-high gain low power two stage CMOS op-amp based on inverse aspect ratio self cascode structures.
  2. T Lee (2002). IC Op-Amps Through the Ages.
  3. K,Elissa Sansen,W (2006). Analog design essentials.
  4. F Silveira,D Flandre,P Jespers (1996). A gm/ID based methodology for the design of CMOS analog circuits and its application to the synthesis of a silicon-on-insulator micropower OTA.
  5. D Binkley,B Blalock,J Rochelle (2006). Optimizing drain current, inversion level, and channel length in analog CMOS design.
  6. P Allen,D Holberg (2002). CMOS analog circuit design.
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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

D. Anitha. 2016. \u201cLow Power High Gain Op-Amp using Square Root based Current Generator\u201d. Global Journal of Computer Science and Technology - H: Information & Technology GJCST-H Volume 16 (GJCST Volume 16 Issue H2): .

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GJCST Volume 16 Issue H2
Pg. 29- 33
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Crossref Journal DOI 10.17406/gjcst

Print ISSN 0975-4350

e-ISSN 0975-4172

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June 8, 2016

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English

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A very high gain two stage CMOS operational amplifier has been presented. The proposed circuit is implemented in 180nm CMOS technology with a supply voltage of ±0.65V. The current source in the OPAMP is replaced by a square root based current generator which helps to reduce the impact of process variations on the circuit and low power consumption due to the operation of MOS in subthreshold region. So with the help of square root based current generator the better controllability over gain can be obtained. The proposed opamp shows a high gain of 121.9dB and low power consumption of 11.89uW is achieved.

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Low Power High Gain Op-Amp using Square Root based Current Generator

D. Anitha
D. Anitha GITAM University
K. Manjunatha Chari
K. Manjunatha Chari
K. Vijaya Krishna
K. Vijaya Krishna
P. Satish Kumar
P. Satish Kumar

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