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Additional info for Capacitively-Coupled Chopper Amplifiers
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.