Philipp Meier auf der Heide, C. Bronskowski, J. Tomasik, D. Schroeder
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A CMOS Operational Amplifier with Constant 68° phase margin over its whole range of noise-power trade-off programmability
The problem of variable phase margin of our programmable operational amplifier (OpAmp), which was presented at ESSCIRC 2006, has been solved. The OpAmp is programmable concerning noise and power consumption, while the phase margin is kept at an approximately constant value of 68deg for the whole range of programmability. Experimental results for a 0.35 mum CMOS OpAmp show either low noise of 3.6 nV/radicHz or low power consumption of 59 muW, and a phase margin variation of only Deltaphires = 6deg.
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