A <inline-formula><tex-math notation="LaTeX">$0.7\;\text{V}\;24\;\upmu\text{A}$</tex-math></inline-formula> Hybrid OTA Driving 15 nF Capacitive Load With 1.46 MHz GBW

Abstract

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 μm CMOS technology, with an active chip area of 0.0027 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . 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 ~100 dB gain, a GBW of 1.46 MHz, and an SR of 0.47 V/μs, consuming only 24 μA of current and requiring no compensation capacitor.