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

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

This booklet describes the idea that and layout of the capacitively-coupled chopper approach, which might be utilized in precision analog amplifiers. Readers will discover ways to layout power-efficient amplifiers applying this method, that are powered through usual low provide voltage similar to 2V and probably having a +/-100V enter common-mode voltage enter. The authors supply either simple layout strategies and special layout examples, which disguise the world of either operational and instrumentation amplifiers for a number of functions, rather in strength administration and biomedical circuit designs.

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Extra resources for Capacitively-Coupled Chopper Amplifiers

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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.

It is not difficult to find that the above parameters are not only designed to satisfy Eq. 3). With Gm1 = 28 µV, the simulated input-referred noise is around 40 nV/√Hz. 5 kHz (with a closed-loop gain of 20), which is smaller than fchop. As a result, the notch introduced by the RRL at fchop can be outside the signal band of the CCOPA. Moreover, the total in-band noise voltage of the CCOPA is *5 µV, which is comparable to the targeted input-referred residual offset (<10 µV). Gm2 is made relatively small to save power consumption.

99 Vref, a time equal to at least 5τ (τ = Rb1,2 × Cin1,2) is then needed. During this time, any mismatch between Rb1 and Rb2 will result in a temporary offset voltage at the input of Gm1, which will in turn generate output ripple. When ripple-reduction techniques (Sect. 3) are employed, this temporary offset can be suppressed. 4 V (p– p); otherwise, the protection diodes will turn on and clip the input of Gm1. As a result, the maximum amplitude and/or the frequency of the input CM signal are restricted by Eq.

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