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

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

This publication describes the idea that and layout of the capacitively-coupled chopper method, that are utilized in precision analog amplifiers. Readers will learn how to layout power-efficient amplifiers applying this system, which are powered by means of commonplace low provide voltage corresponding to 2V and doubtless having a +/-100V enter common-mode voltage enter. The authors supply either easy layout recommendations and particular layout examples, which conceal the world of either operational and instrumentation amplifiers for a number of functions, rather in energy administration and biomedical circuit designs.

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For instance, in the current-sensing applications which will be presented in Chap. 6, the source impedance will be no larger than a few hundreds of Ohm. Thus, the input impedance of a normal CCIA will be sufficient. However, in applications where the source impedance is much higher, the input impedance of the CCIA must be increased. A solution will be presented later in Chap. 7. 6 Output Spikes When an output signal Vout is present, the feedback capacitors are sampling either +Vout or −Vout due to the feedback chopper.

A. Kovacs, “A rail-to-rail ping-pong op-amp,” IEEE J. State Circuits, vol. 31, no. 9, pp. 1320–1324, Sept. 1996. 20. pdf. Chapter 3 Capacitively Coupled Chopper Amplifiers As discussed in Chap. 1, capacitively coupled chopper amplifiers can potentially handle input common-mode voltages far beyond their own supplies. Furthermore, their inherent use of chopping means that they can also achieve microvolt offset and low 1/f noise. In this chapter, the operation of capacitively coupled chopper amplifiers will be described in more detail.

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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