A 0.7 V 24 μA Hybrid OTA Driving 15 nF Capacitive Load With 1.46 MHz GBW

A cascade structure of six proposed signal-current enhancers is applied to a standard operational transconductance amplifier (OTA) to improve its gain-bandwidth (GBW) product, slew rate (SR), and voltage gain through significant enhancements of the small-signal and transient output currents from the proposed enhancers. The proposed hybrid OTA is implemented in a standard 0.13 mu m CMOS technology, with an active chip area of 0.0027 mm(2). Working under a 0.7 V supply and as proven by the measurement results, the resultant OTA when driving an output capacitor of 15 nF attained similar to 100 dB gain, a GBW of 1.46 MHz, and an SR of 0.47 V/mu s, consuming only 24 mu A of current and requiring no compensation capacitor.