Improved performance recycling folded cascode OTA using multipath positive feedback and pseudo differential pair for biasing
ANNU DABAS RICHA YADAV MANEESHA GUPTA
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An improved performance recycling folded cascode (IPRFC) operational transconductance amplifier (OTA) is presented in this paper. It utilizes the pseudo differential pair at input stage to improve the slew rate and endorses the positive feedback in the current mirror load to enhance the transconductance of OTA. Further, the positive feedback is split into two paths which further increase the transconductance and output resistance which improves the frequency response of OTA. The splitting of the current in two paths also improves the linearity of the RFC OTA. The proposed tailoring in the structure exhibits a notable increment in transconductance as it results in boosted gain, unity gain bandwidth and slew rate of conventional recycling folded cascode (RFC) OTA. The noise measured is also comparatively low even though the input differentialpair consists of NMOS transistor. Mentor Graphics Eldo simulation tool is used to design and simulate the proposed circuit under 0.18 lm CMOS technology and ±1 V power supply. The results illustrate that the proposed circuit has boosted gain of 83.79 dB and unity gain bandwidth of 21.15 MHz driving the capacitiveload of 15 pF. The power dissipated by the amplifier is 84 μW. The outcomes also fairly validate the figure of merit and show significant improvement in sensitivity of temperature on the proposed IPRFC OTA.
ANNU DABAS1 2 RICHA YADAV1 MANEESHA GUPTA3
Volume 48, 2023
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