# ENEE 307 Electronic Circuit Design Laboratory Spring A. Iliadis Electrical Engineering Department University of Maryland College Park MD 20742

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2 And it follows that for pure differential input (i.e. v ic = 0 ) v 1 = - v 2, and for pure common mode input (i.e. v id = 0) v 1 = v 2. The gain expressions are derived the usual small signal linear analysis, and once the gains are known then the output voltages can be found for any combination of v 1 and v 2. Two different types of gain can be extracted: 1. The single-ended differential mode output gain A d1 and A d2, measured at each output terminal and the ground is given as: A d1 = - g m R C /2 and A d2 = + g m R C /2 [1.1.2] The single-ended common mode output gain A c1 and A c2, measured at each output terminal and the ground is given as: A c1 = - [g m R C ]/[1+2 g m r oc ] and A c2 = - [g m R C ]/[1+2 g m r oc ] [1.1.3] where r oc is the resistance of your current bias i.e. the resistance of transistor Q 3 of the current mirror. 2. The differential (measured between the two output terminals) differential mode output given as: A dd = A d1 - A d2 = g m R C and [1.1.4] the differential (measured between the two output terminals) common mode output given as: A cd = A c1 - A c2 = 0 [1.1.5] [1.1.4],[1.1.5] are valid only if the two collector resistances are exactly equal. The primary function of the diff-amp is to enhance the difference between the two inputs and supress the common mode component. Hence a figure of merit for the diff-amp is the common-mode rejection ratio which must be as large as possible and it is defined as follows: CMRR = 20log A d / A c [1.1.6] 1.2. Single stage diff-amp Design and build a single stage diff-amp (Fig. 1.1) with a linear output response in the frequency range of 20Hz to 20KHz. Use V CC = 10V and V EE = -10V Measure voltages and currents, diff and common mode gains, open and closed circuit gains, CMRR, and frequency response What can you change in the simple circuit to significantly improve its gain? (Current mirror

3 active load) Multistage diff-amp Design and build a two stage diff-amp (Fig. 1.2) with a linear output response in the frequency range of 20Hz to 20KHz. Target a minimum open circuit voltage gain of 1000 V/V, and a closedcircuit gain of 100 V/V. Design for low power consumption Measure the parameters of your circuit as above What approach would you take to increase the frequency range of your diff-amp? 1.4. Design a simple op-amp Design and build a simple op-amp circuit (Fig. 1.3) with the same specs as your single stage diff-amp Measure the parameters and characteristics of the op-amp Extra credit: Design and build a non-inverting Miller integrator: v o (t) = 2/RC_v i (t) dt Design and build a full-wave rectifier.

4 Figure 1.1.

5 Figure

6 Figure 1.3. Figure 1.2.

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