| چکیده انگلیسی مقاله |
A non-Miller high bandwidth (BW) two-stage class A-AB operational transconductance amplifier (OTA) is presented. A nulling resistor with a series compensating capacitor is applied at the output node, extending the gain-bandwidth product (GBW) by introducing a left-half-plane (LHP) zero. Also, simple circuitry included an analog inverter is applied to achieve class A-AB. The proposed circuit is simulated using a 0.18µm 1.8V CMOS process standard technology. Simulation results with a 10pF capacitance load show that DC gain, GBW, average SR, average 1% settling time, and phase margin (PM) are 56.0 dB, 145.2 MHz, 89.8 V/μs, 25.0 ns, and 58.2o, respectively. The PM, GBW, and average SR change to 79.1o, 26.7 MHz, and 17.1 V/μS, respectively, when driving a 100 pF capacitance load. Small signal analysis and simulation results indicate that the proposed OTA has a good performance at a large capacitive load. The proposed amplifier consumes 0.54mW @ 1.8V, which makes it a high current efficiency two-stage amplifier. |
