# Analog electronics with LabVIEW by Kenneth L. Ashley PDF

By Kenneth L. Ashley

ISBN-10: 0130470651

ISBN-13: 9780130470652

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Additional resources for Analog electronics with LabVIEW

Example text

This is accounted for by including an output resistance, rout, in the linear model, as added to the circuit in Fig. 5. 5. Basic linear circuit with transistor linear model. Circuit includes signal source voltage and load RL, Transistor model now includes output resistance rout. where VA is the characterizing transistor parameter. 2); these equations are consistent with the simplified circuit model of Fig. 2. 5). This is discussed in Unit 4. 7) to include rout in parallel with RL as in Fig. 5. 11 The parameter VA of both transistors can typically be about 100 V.

They are the proportionality constants between incremental variables of current and voltage. For the linear model to be valid, the increment must be small compared to the dc (bias) value of the variable. To qualify as small, the increment must be sufficiently small, in each case, as to avoid unacceptable degrees of nonlinearity in the variable relationships. The conditions are explored in Unit 5 in connection with linearity of an amplifier gain function. In the following, the three conductance parameters are explored, and in each case, an expression for obtaining the circuit value is developed.

For this reason, the Fig. 1(b) version is chosen for use in all of the following discussions of MOSFET circuits. All other details of the transistor model, as discussed in this unit, will be added externally. Signal Vg = Vi is applied to the gate (input) and, in response, a signal voltage, Vo, appears at the drain (or source). We would like to analyze the signal performance in terms of voltage gain, av = Vo/Vi = Vd/Vg (or av = Vs/Vg), of the circuit based on a linear (smallsignal) analysis. In any case, the voltage gain is av = GmRx, where Gm is the circuit transconductance (as opposed to the transistor transconductance) and x = D (common source) or x = S (source follower).