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

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

This booklet describes the idea that and layout of the capacitively-coupled chopper strategy, that are utilized in precision analog amplifiers. Readers will discover ways to layout power-efficient amplifiers using this system, which might be powered by way of standard low offer voltage corresponding to 2V and probably having a +/-100V enter common-mode voltage enter. The authors offer either uncomplicated layout thoughts and unique layout examples, which disguise the realm of either operational and instrumentation amplifiers for a number of functions, really in strength administration and biomedical circuit designs.

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Extra resources for Capacitively-Coupled Chopper Amplifiers

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These approaches, however, all significantly increase the opamp’s power consumption. 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.

Two sets of diodes (forward and reverse) are connected to the gates of every switch. 7 V below the source voltage. 1 V above the drain. Different numbers of forward and reverse diodes can be used. However, it is best to use just one reverse diode, since more diodes will result in an unnecessary loss of overdrive voltage. The number of forward diodes depends on the supply voltage and the desired overdrive voltage. In the particular case shown in Fig. 2 High-voltage (HV) Chopper Topologies 41 Fig.

In this chapter, the operation of capacitively coupled chopper amplifiers will be described in more detail. The capacitively coupled chopper opamp (CCOPA) topology will be presented first (Sect. 1), followed by the capacitively coupled chopper IA (CCIA) topology (Sect. 2). For both topologies, an analysis will be made of their offset, input-referred noise, and power efficiency and also discussed will be their common-mode rejection ratio (CMRR), input CM voltage range (CMVR), input impedance, and settling and transient issues.

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