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A Cross-Coupled Cascode Feedback Design of an Area-Efficient Frequency Compensated OTA

  • Research Article-Electrical Engineering
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Abstract

A cross-coupled cascode feedback design for a frequency compensated operational transconductance amplifier (OTA) is presented here. This OTA is able to achieve a power supply rejection ratio (PSRR) 93 dB (DC) and common mode rejection ratio (CMRR) 41.41 dB (DC) with very low value of compensation capacitors 0.1pF driving a large load of 400pF||2.2kΩ. The proposed OTA design is simulated in 180 nm technology using Electric VLSI tool for validating its performance. The simulated results, PSRR 93 dB at 1 kHz, 83.42 dB at 1 MHz, 71.23 dB at 1 GHz are noted. Further simulated results, CMRR 41.41 dB at 1 kHz, 41.97 dB at 1 MHz and 70.79 dB at 1 GHz are also observed. Small signal and transient performances are analyzed and post-layout simulations bring out the following results: DC gain of 43.21 dB, unity-gain-frequency (UGF) of 27 MHz, Phase Margin of 48.50, slew-rate ( +) of 4.63 V/μs and slew-rate ( −) of 1.00 V/μs. Additionally, the circuit occupies an area of 0.014 \({\mathrm{mm}}^{2}\) and the power consumption observed is 3.17 mW.

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Authors and Affiliations

  1. Electronics and Communication Engineering Department, Netaji Subhash University of Technology, East Campus, Delhi, India

    Sumit Kumar & R. K. Sharma

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  1. Sumit Kumar
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  2. R. K. Sharma
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Correspondence to R. K. Sharma.

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Kumar, S., Sharma, R.K. A Cross-Coupled Cascode Feedback Design of an Area-Efficient Frequency Compensated OTA. Arab J Sci Eng 49, 6305–6317 (2024). https://doi.org/10.1007/s13369-023-08126-8

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  • DOI: https://doi.org/10.1007/s13369-023-08126-8

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