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, 18 MHz of gain-bandwidth product and 86° phase margin are achieved with an output load capacitance of 80 pF.