By Qinwen Fan, Kofi A. A. Makinwa, Johan H. Huijsing
This booklet describes the concept that and layout of the capacitively-coupled chopper procedure, which might be utilized in precision analog amplifiers. Readers will learn how to layout power-efficient amplifiers utilising this system, which are powered by way of common low offer voltage corresponding to 2V and doubtless having a +/-100V enter common-mode voltage enter. The authors supply either simple layout innovations and designated layout examples, which conceal the realm of either operational and instrumentation amplifiers for a number of functions, quite in strength administration and biomedical circuit designs.
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Extra info for Capacitively-Coupled Chopper Amplifiers
Thus, a more power efﬁcient way of achieving wide CMVR is required. Moreover, when used in precision measurement systems, microvolt offset and high common-mode rejection ratio (CMRR) are required. To simultaneously obtain wide input CMVR, high power efﬁciency, and precision, a CCOPA is proposed, whose basic working principle has been introduced in Chap. 3. This allows the opamp’s CMVR to be extended maximally to the breakdown voltage of the input capacitors without any extra power dissipation. When combined with chopping, microvolt offset and high CMRR can be expected as explained in Chaps.
R. Wu, K. A. A. Makinwa and J. H. feedback instrumentation ampliﬁer with a 1 mHz 1/f noise corner and an AC-coupled ripple-reduction loop,” IEEE J. 44, no. 12, pp. 3232–3243, Dec. 2009. 13. J. Xu, R. F. Yazicioglu, B. Grundlehner, P. Harpe, K. A. A. Makinwa and C. Van Hoof, “A 160 µW 8-channel active electrode system for EEG monitoring,” IEEE Transactions on Biomedical Circuits and Systems, vol. 5, iss. 6, pp. 555–567, Dec. 2011. 14. F. Michel and M. 13 μm CMOS,” IEEE ISSCC Dig. Tech. papers, pp.
A schematic of Gm3 is shown in Fig. 7. 4 Implementation of the Input CM Biasing Resistors The biasing resistors Rb1,2 shown in Fig. 3 deﬁne the input CM voltage of Gm1. As explained in Chap.