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By Kenneth L. Ashley

Publication by means of Ashley, Kenneth L.

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Analog electronics with LabVIEW

E-book by means of Ashley, Kenneth L.

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Example text

The linear region is also called the triode region or presaturation region. 8 V. Also plotted is the ideal characteristic with zero slope in the active region. The output-characteristic equation in the linear region corresponds to VDS ranging from the condition of Fig. 1(b) to that of Fig. 1(c). , the channel becomes progressively more wedge shaped). The result is an increase in the resistance of the channel as a function of VDS, and therefore a sublinear current – voltage relation develops. When VGS > Vtno, the electron charge in the channel can be related to the gate voltage by Qchan = Cox(VGS – Vtno) (per unit area of MOSFET looking down at the gate), where Cox is the parallel-plate capacitance (per unit area) formed by the MOS structure.

LabVIEW obtains the slope and intercept from a straight-line fit to the data. The measured transfer characteristic thus yields the two parameters and Vtno. In Project 4, parameter λn is obtained from finding based on at two different VDS values. 13 where the values are measured and λn is the only unknown. 3. Body Effect and Threshold Voltage In Fig. 4 is shown an example of a circuit in which the body and source cannot be at the same voltage. We now use the four-terminal symbol for the NMOS, which includes the body contact.

Both amplifiers are based on the PMOS, as in the projects. The first two units are mostly a review of the basic amplifier as presented in previous units, to reinforce the basic concepts. The PMOS replaces the NMOS (Units 2 and 4) in this unit, to provide familiarity with the opposite polarity in bias considerations and to illustrate that the linear model applies in the same manner for both transistor types. 1. DC (Bias) Circuit Dc circuits for the grounded-source amplifier are shown in Fig. 1 (PMOS).

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