This paper describes a chopper stabilized amplifier, obtained using an input chopper for modulation, an AC coupling for offset rejection and a correlated double sampling structure for demodulation, avoiding ripple spurs. The operational amplifier has a rail-to-rail input stage, with a supply voltage range from 1.8V to 5V. It is characterized by a multipath nested Miller compensation network with double pole-zero cancellation. The circuit achieves a simulated 130dB-dc-gain with a current consumption of 20 mu A, suitable for low-power application. Equivalent input offset has been evaluated by Montecarlo simulations demonstrating a maximum standard deviation of about 4 mu V
Pipino, A., DE BLASI, M., DE MATTEIS, M., D'Amico, S., Fornasari, A., Baschirotto, A. (2013). A 36μW rail-to-rail-input chopper stabilized amplifier using correlated double sampling. In Conference Proceedings - 9th Conference on Ph. D. Research in Microelectronics and Electronics, PRIME 2013 (pp.69-72) [10.1109/PRIME.2013.6603126].
A 36μW rail-to-rail-input chopper stabilized amplifier using correlated double sampling
PIPINO, ALESSANDRA;DE BLASI, MARCO;DE MATTEIS, MARCELLO;BASCHIROTTO, ANDREA
2013
Abstract
This paper describes a chopper stabilized amplifier, obtained using an input chopper for modulation, an AC coupling for offset rejection and a correlated double sampling structure for demodulation, avoiding ripple spurs. The operational amplifier has a rail-to-rail input stage, with a supply voltage range from 1.8V to 5V. It is characterized by a multipath nested Miller compensation network with double pole-zero cancellation. The circuit achieves a simulated 130dB-dc-gain with a current consumption of 20 mu A, suitable for low-power application. Equivalent input offset has been evaluated by Montecarlo simulations demonstrating a maximum standard deviation of about 4 mu V
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