By Qinwen Fan, Kofi A. A. Makinwa, Johan H. Huijsing
This publication describes the concept that and layout of the capacitively-coupled chopper process, which are utilized in precision analog amplifiers. Readers will discover ways to layout power-efficient amplifiers applying this method, that are powered by way of standard low offer voltage akin to 2V and doubtless having a +/-100V enter common-mode voltage enter. The authors supply either uncomplicated layout innovations and distinct layout examples, which conceal the world of either operational and instrumentation amplifiers for a number of purposes, fairly in strength administration and biomedical circuit designs.
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This ebook describes the idea that and layout of the capacitively-coupled chopper strategy, which are utilized in precision analog amplifiers. Readers will learn how to layout power-efficient amplifiers applying this system, that are powered by way of general low provide voltage corresponding to 2V and probably having a +/-100V enter common-mode voltage enter.
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Extra resources for Capacitively-Coupled Chopper Amplifiers
Wu, J. Wu, Y. Chen, “Fully capacitive coupled input choppers”, US patent in process. 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.
2 V Vds) of DMOS transistors. The threshold voltage of DMOS transistors is also higher than that of the floating HV NMOS transistors. As a result, the floating HV NMOS transistors are the preferred switches for a HV chopper. In next section, several HV chopper topologies will be introduced. 1 High-voltage (HV) Chopper Topologies HV Chopper with HV Ampliﬁer Level-Shifter A HV chopper using a HV ampliﬁer level-shifter has been described by C. Birk in . A simpliﬁed schematic of the chopper is shown in Fig.
2, the residual offset depends on the charge 54 5 Capacitively-Coupled Chopper Operational Ampliﬁers injection and clock feed-through errors of the chopper switches. Thus, a relatively low fchop is preferred to achieve a low residual offset. A fourth consideration is the residual chopper ripple, which is due to the non-idealities of the RRL. With low fchop, these errors become larger and more difﬁcult to ﬁlter. Based on these considerations, fchop is chosen to be 25 kHz in this work. Later, measurement results will prove that this choice results in sufﬁcient 1/f noise suppression, and a good combination of both low residual offset and low residual ripple.