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

Abstract 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 g m to create the feedforward path no additional circuitry is needed. To verify the proposed scheme a prototype was fabricated using 0.5 μ m 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.