By Qinwen Fan, Kofi A. A. Makinwa, Johan H. Huijsing
This e-book describes the idea that and layout of the capacitively-coupled chopper process, that are utilized in precision analog amplifiers. Readers will discover ways to layout power-efficient amplifiers using this method, which are powered via usual low offer voltage reminiscent of 2V and doubtless having a +/-100V enter common-mode voltage enter. The authors offer either uncomplicated layout options and specified layout examples, which hide the world of either operational and instrumentation amplifiers for a number of purposes, relatively in energy administration and biomedical circuit designs.
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Additional resources for Capacitively-Coupled Chopper Amplifiers
44, no. 7, pp. 2036-2046, July, 2009. 5. J. F. Witte, J. H. Huijsing, and K. A. A. Makinwa, “A current-feedback instrumentation ampliﬁer with 5 µV offset for bidirectional high-side current-sensing,” IEEE J. Solid-State Circuits, vol. 43, no. 12, pp. , 2008. 6. T. Denison, K. Consoer,W. ,“A 2 µW 100nV/√Hz Chopper Stabilized Instrumentation Ampliﬁer for Chronic Measurement of Neural Field Potentials,” IEEE JSSC, vol. 42, no. 12, pp. , 2007. 7. R. P. Areny and J. G. Webster, “AC instrumentation ampliﬁer for bioimpedance measurements,” IEEE Trans.
372–374, Feb. 2012. 15. R. F. Yazicioglu, P. Merken, R. Puers and C. Van Hoof, “A 60 µW60 nV√Hz readout frontend for portable biopotential acquisition systems,” IEEE J. State Circuits, vol. 42, no. 5, pp. 1100–1110, May 2007. 16. M. 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.
3 5 Capacitively-Coupled Chopper Operational Ampliﬁers Switched-Capacitor Ripple-Reduction Loop (SC RRL) In a chopper ampliﬁer, the up-modulated offset and 1/f noise cause ripple. To suppress this, a ripple-reduction loop (RRL) can be employed. The working principle of a RRL has already been introduced in Chap. 2 (Fig. 9). However, the RRL presented in Chap. 2 is not very practical because the offset of the RRL integrator Gm3 will, via Cs1,2, give rise to large residual ripple. To eliminate this offset, the integrator can be auto-zeroed.