Abstract
A current recycling structure is used to boost the tail current source of an operational transconductance amplifier (OTA), improving the slew rate (SR). The proposed current recycling circuit detects the magnitude of the differential input voltage and adjusts the tail current source value in proportion to the absolute value of the detected differential input voltage. When a small input signal is applied, the quiescent current of the OTA does not change; therefore the proposed tail current boosting circuit does not degrade the voltage gain and bandwidth. The proposed boosted tail current source has been used to drive a two-stage class A-AB OTA to evaluate its performance. Post-layout simulation results using standard 0.18 µm 3.3 V CMOS process technology show SR improvement of approximately 396% at the cost of 21% increase in static power consumption compared to a two-stage class A-AB primary OTA. The proposed AB-AB OTA achieves 65.7 V/μs at a static power consumption of 0.38 mW when driving a 10 pF capacitive load.
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References
Abdolmaleki M, Dousti M, Tavakoli MB (2021) Design and simulation of fourth order low-pass Gm-C filter with novel auto-tuning circuit in 90 nm CMOS. Analog Integr Circ Sig Process 107:451–461. https://doi.org/10.1007/s10470-020-01785-9
Aguado-Ruiz J, Lopez-Martin A, Lopez-Lemus J, Ramirez-Angulo J (2014) Power efficient class AB op-amps with high and symmetrical slew rate. IEEE Trans Very Large Scale Integr (VLSI) Syst 22(4):943–947. https://doi.org/10.1109/TVLSI.2013.2256946
Allen PE, Holberg DR (2011) CMOS analog circuit design, 3th edn. The Oxford Series in Electrical and Computer Engineering
Aminzadeh H, Ballo A, Valinezhad M, Grasso AD (2022) An unconditionally stable three-stage OTA. IEEE Solid State Circuits Lett 5:230–233. https://doi.org/10.1109/LSSC.2022.3206892
Anisheh SM, Abbasizadeh H, Shamsi H, Dadkhah C, Lee K-Y (2019) 98-dB Gain class-AB OTA with 100 pF load capacitor in 180-nm digital CMOS process. IEEE Access 7:17772–17779. https://doi.org/10.1109/ACCESS.2019.2896089
Assaad RS, Silva-Martinez J (2009) The recycling folded cascode: a general enhancement of the folded cascode amplifier. IEEE J Solid-State Circuits 44(9):2535–2542. https://doi.org/10.1109/JSSC.2009.2024819
Baker RJ (2011) Circuit design, layout and simulation, 3rd edn. Wiley-IEEE press, New York
Carusone T, Johns CD, Martin K (2011) Analog integrated circuit design, 2nd edn. Wiley, New York
Dabas A, Gupta M, Yadav R et al (2023) Design and analysis of high-performance double recycling folded cascode operational transconductance amplifier. Iran J Sci Technol Trans Electr Eng. https://doi.org/10.1007/s40998-023-00604-xM
Garde MP, Lopez-Martin A, Carvajal RG, Ramírez-Angulo J (2018) Super class-AB recycling folded cascode OTA. IEEE J Solid-State Circuits 53(9):2614–2623. https://doi.org/10.1109/JSSC.2018.2844371
Grasso AD, Pennisi S, Scotti G, Trifiletti A (2017) 0.9-V Class-AB miller OTA in 0.35-μm CMOS with threshold-lowered non-tailed differential pair. IEEE Trans Circuits Syst I Regul Pap 64(7):1740–1747. https://doi.org/10.1109/TCSI.2017.2681964
Khade AS, Musale S, Suryawanshi R et al (2021) A DTMOS-based power efficient recycling folded cascode operational transconductance amplifier. Analog Integr Circ Sig Process 107:227–238. https://doi.org/10.1007/s10470-021-01809-y
Kinget PR (2005) Device mismatch and tradeoffs in the design of analog circuits. IEEE J Solid-State Circuits 40(6):1212–1224. https://doi.org/10.1109/JSSC.2005.848021
Kuo P, Tsai S (2019) An enhanced scheme of multi-stage amplifier with high-speed high-gain blocks and recycling frequency cascode circuitry to improve gain-bandwidth and slew rate. IEEE Access 7:130820–130829. https://doi.org/10.1109/ACCESS.2019.2940560
Ramirez-Angulo J, Carvajal RG, Galan JA, Lopez-Martin A (2006) A free but efficient low-voltage class-AB two-stage operational amplifier. IEEE Trans Circuits Syst II Express Briefs 53(7):568–571. https://doi.org/10.1109/TCSII.2006.875320
Rashtian M (2022a) High-gain and high-slew-rate two-stage class A-AB op-amp. Iran J Sci Technol Trans Electr Eng 46:235–243. https://doi.org/10.1007/s40998-021-00449-2
Rashtian M (2022b) Adaptive double recycling folded cascode amplifier. Analog Integr Circ Sig Process 110:165–174. https://doi.org/10.1007/s10470-021-01971-3
Rashtian M, Vafapour M (2021) Gain boosted folded cascode op-amp with capacitor coupled auxiliary amplifiers. Int J Eng 34(5):1233–1238. https://doi.org/10.5829/ije.2021.34.05b.16
Razavi B (2017) Design of analog CMOS integrated circuits, 2nd edn. McGraw-Hill Education, New York
Roman-Loera A, Ramirez-Angulo J, Lopez-Martin A, Carvajal RG (2015) Free class AB–AB Miller opamp with high current enhancement. Electron Lett 51(3):215–217. https://doi.org/10.1049/el.2014.4064
Valero MR, Thoutam S, Ramírez-Angulo J, Lopez-Martín A, Carvajal RG (2015) Slew rate enhancement based on use of squaring circuits. Electron Lett 51(3):219–220. https://doi.org/10.1049/el.2014.3975
Xin Y, Zhao X, Wen B, Dong L, Lv X (2020) A high current efficiency two-stage amplifier with inner feedforward path compensation technique. IEEE Access 8:22664–22671. https://doi.org/10.1109/ACCESS.2020.2967870
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Rashtian, M. Slew Rate Enhancement Using Recycling Tail Current Source. Iran J Sci Technol Trans Electr Eng (2024). https://doi.org/10.1007/s40998-024-00695-0
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DOI: https://doi.org/10.1007/s40998-024-00695-0