High gain amplifier with feedforward compensation based on quasi-floating gate transistors

In this paper, a two-stage amplifier with feedforward frequency compensation scheme is presented. Because the frequency compensation scheme uses the amplifier's second stage gm to create the feedforward path no additional circuitry is needed. To verify the proposed scheme a prototype was fabricated using 0.5μm technology. Measurements results demonstrate a high DC gain, 18MHz of gain-bandwidth product and 86° phase margin are achieved with an output load capacitance of 80pF. •Compensation uses the amplifier's second stage gm to create the feedforward path.•It requires less power consumption because no additional circuitry is needed.•Bandwidth is increased.•First stage uses a gain enhancement technique.•Circuit is suitable for submicron technologies where intrinsic gain has lower values.•A prototype was fabricated in ON SEMI 0.5µm technology.•Measurements of the fabricated chip are presented.