Download Capacitively-Coupled Chopper Amplifiers by Qinwen Fan, Kofi A. A. Makinwa, Johan H. Huijsing PDF

By Qinwen Fan, Kofi A. A. Makinwa, Johan H. Huijsing

This e-book describes the concept that and layout of the capacitively-coupled chopper process, that are utilized in precision analog amplifiers. Readers will learn how to layout power-efficient amplifiers making use of this method, which are powered via general low offer voltage corresponding to 2V and probably having a +/-100V enter common-mode voltage enter. The authors supply either uncomplicated layout options and particular layout examples, which conceal the realm of either operational and instrumentation amplifiers for a number of purposes, rather in energy administration and biomedical circuit designs.

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Chapter 5 Capacitively-Coupled Chopper Operational Amplifiers In Chap. 3, the basic capacitively-coupled chopper topology for operational amplifiers (opamp) has been described. In this chapter, two capacitively-coupled chopper opamps (CCOPA) will be presented. They both achieve wide input common-mode voltage range (CMVR) and high precision. The first opamp employs a single-path architecture and features high power efficiency and simplicity. The second opamp is more complex and employs a multipath architecture.

Chopping introduces ripple which must be suppressed, and this is done by employing a ripple-reduction loop (RRL). The RRL, however, creates a notch in the opamp’s transfer function as explained in Chap. 2. Moreover, an input signal at fchop can be demodulated by the input chopper and then blocked by © Springer International Publishing AG 2017 Q. 1007/978-3-319-47391-8_5 47 48 5 Capacitively-Coupled Chopper Operational Amplifiers the input capacitors (Fig. 1). To overcome these problems, a multipath CCOPA is proposed, which achieves a smooth transfer function, an output step response without significant chopper ripple, and wider bandwidth.

Pertijs and W. J. Kindt, “A 140 dB-CMRR current-feedback instrumentation amplifier employing ping-pong auto-zeroing and chopping,” IEEE ISSCC Dig. Tech. Papers, pp. 324– 325, Feb. 2009. 17. A. T. K. Tang, “A 3 μV-offset operational amplifier with 20nV/√Hz input noise PSD at DC employing both chopping and auto zeroing,” IEEE ISSCC Dig. Tech. Papers, pp. 386–387, Feb. 2002. 18. K. pdf. 19. I. E. Opris and G. T. A. A. Kovacs, “A rail-to-rail ping-pong op-amp,” IEEE J. State Circuits, vol. 31, no. 9, pp.

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