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Unformatted text preview: (i.e. 1 S I ) , and thus 2 S I . 3. Use your I C22 C V data to find 2 o r , (the output resistance of Q2), A V (the early voltage of Q2), and o I (the nominal output current). B) Widlar Current Source 1. Construct a BJT Widlar current source shown in Fig. 2. Use the dc technique outlined in (A) to find the nominal output current and the output resistance, 2 2 2 (1 ) OUT o m R r g R = + where 2 2 / o A C r V I = . 2. Measure REF I where 2 C V is about 2 volts. C) Wilson Current Source 1. Construct a Wilson current source shown in Fig. 3, using three identical transistors with a value. Set 2 C V to several values between 1 volt and 12 volts and measure the voltage drop across the 1K resistor. Also measure BE V for several values of CE V and calculate a value for S I . From these data, find , , , o A o I V r and o R ....
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 Spring '08
 WU

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