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ElectronicsFinal1996Cahay - Name ELECTRONICS I I Consider...

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Unformatted text preview: Name: ELECTRONICS I December 10, 1996 I. Consider the circuit below in which the base voltage is obtained with a voltage divider across a. 9 V supply (battery). Assume that the transistor has a very high [3 and daimmto obtain V3 = 3 V. Design the circuit for a 0.2 mA in the voltage divider. Now if the ,3 of the BJT is 100, analyze the circuit to detemxinethecollector current and the collector voltage. 4' W l/ ~ (4.? 1-4 “\\ , j ._ , )M‘ '5 ”id/l" +§V l, \// 4 \kfl 1' . t II. The BJT in the circuit below has ,3 = 100 ( neglect the Early effect). 0 Find the dc collector current and the dc voltage at the collector. 0 Replace the transistor by its T-model and draw the small-signal equiva- lent circuit of the amplifier. 0 Determine the voltage gian vo/v;. r’ III. In the common emitter configuration shown on the diagram below, the signal source is directly connected to the base. The dc component of 0.18 is zero. Find the dc emitter current. Assurne B— —- 120. Neglect r0, find Rg, the voltage gain vo/v, , the current gain 10/1,, and the output-resistance Ra. IV. Analyze the circuit below to find gland VD. The depletion MOSFET has V; = —-1V, K = 0.5mA/V’, and A = 0. g : .(Z. R62 IS—HJZ RS lék ”‘MUS .. Ho _ dip/572'», _ [.1 '— [It +l-§V ,‘ms‘ 931" H—W—f/j; ) i) :I f u U lo lolc 455“m( 54 7”“f47’114 QID; 150D) -30L9 +0.3;— 0 : lgoIo-?}IO“‘"§- rm- W~-- 3 1 f (nib! * «QM/w» 1/032 bag—uf V 5‘ U! ' l,S‘ - IL{,/S{) ‘9 ( 0 ' ...- I5 ) V451~I¢Gl —CL.70(-F ’7’ (U r“? > In: IMF 7'{IQ‘ V. The transistor in the circuit below has V} = 2V, K = 0.25mA/V’, and A = 0. Find the dc voltage Vo. Also, replace the transistor with its T—model and find the small-signal resistance R0,“. VI. For the two circutl’s shown below, calculate the labelled voltages. For all devices, V, = 1V, K = 0.5mA/V’, and 1‘ = 0. VII. The circuit below is called 3 Wilson current mirror. Assume all BJTs are matched and have the same finite B. Show that 10/ I 113; is given by VIII. For the circuit shown below, assume IVBEI = 0.7 V and ,3 is infinite for all transistors. Find the values of the quantities indicated on the diagram. +sv ...
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