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Design of low power inverter based OTA in FinFET technology
(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-02) Mohit Kumar; Sharma, K.K.
OTA performance analysed by following four different analysis on SPICE tool First DC analysis of proposed circuit is done on input sweep from -0.7 to 0.7 to understand the output current behaviour and finding proper operating point. The following parameter has been calculated as – Output current swing from -125μV to 125μV, differential mode transconductance 215.29 μS at IDS = 23 μA and total power consumption at Z=50Ω is 234μW. VG1 and VG4 terminal voltage can be used to tune the transconducatance value. There is no need of extra regulated on chip supply voltage. Second, Frequency response analysis is performed to calculate differential mode gain , common mode gain, unity gain bandwidth, phase margin, CMRR, PSRR. Achieved open loop gain of the circuit is 52dB , unity gain bandwidth is 1Ghz at CL = 0.1pF , phase margin is 80˚,PSRR+ obtained 52.007dB, PSRR- obtained 52.012dB, CMRR obtained 49.5dB. Positive slew rate and negative slew rate values are 1.034 v/ns and 0.83 v/ns respectively In proposed circuit noise analysis has been done at load Z=50Ω. Proposed circuit suffer with total input noise value of 1.08μV/√Hz and total output noise calculated to be 6.43nV/√Hz .