Bhadra, Dipanjan (2011) Physical design of low power operational amplifier. MTech thesis.
A CMOS single output two stage operational amplifier is presented which operates at 3 V power supply at 0.18 micron (i.e., 180 nm) technology. It is designed to meet a set of provided specifications. The unique behavior of the MOS transistors in sub- threshold region not only allows a designer to work at low input bias current but also at low voltage. This op-amp has very low standby power consumption with a high driving capability and operates at low voltage so that the circuit operates at low power. The op-amp provides a gain of 20.4dB and a -3db bandwidth of 202 kHz and a unity gain bandwidth of 2.15MHz for a load of 5 pF capacitor. This op-amp has a PSRR (+) of 85.0 dB and a PSRR (-) of 60.0 dB. It has a CMRR (dc) of -64.4 dB, and an output slew rate of 12.465 v/µs. The power consumption for the op-amp is 1.18mW. The presented op-amp has a Input Common Mode Range(ICMR) of -1V to 2.4V. The op-amp is designed in the 180 nm technology using the umc 180 nm technology library. The layout for the above op-amp had been designed and the post layout simulations are compared with the schematic simulations.
The proposed op-amp is a simple two stage single ended op-amp. The input stage of the op-amp is a differential amplifier with an NMOS pair. The second stage of the op-amp is a simple PMOS common source amplifier. The second stage is used to increase the voltage swing at the output. The op-amp uses a -3v Vdd and a -3v Vss and consumes a power of around 0.6mW (as per post layout simulations).
|Item Type:||Thesis (MTech)|
|Uncontrolled Keywords:||current mirrors, differential amplifiers, common source amplifier|
|Subjects:||Engineering and Technology > Electronics and Communication Engineering > VLSI|
|Divisions:||Engineering and Technology > Department of Electronics and Communication Engineering|
|Deposited By:||Mr Dipanjan Bhadra|
|Deposited On:||09 Jun 2011 16:59|
|Last Modified:||09 Jun 2011 16:59|
|Supervisor(s):||Mahapatra, K K|
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