m fallah - Department of Electrical Engineering, Babol University of Technology, Iran
h. Miar Naimi - Department of Electrical Engineering, Babol University of Technology, Iran

In this work, a low power, low voltage and high gain operational amplifier is proposed. For this purpose, a negative resistance structure is used in parallel with output to improve the achievable gain.Because of using self cascode transistors in the output, the proposed structure remains approximatelyconstant in a relatively large output voltage swing causing an invariable gain. To evaluate the proposed method an op amp was designed in 0.18μm CMOS technology. The simulation results showed a gain of 84dB, unity gain bandwidth of 12.45MHz and phase margin of 81 degree; with 1V power supply and 1pF load capacitor.

Negative Resistance,Op Amp,Self Cascode Transistors