3220 test #2 fall 2001

# 3220 test #2 fall 2001 - Name SSN EE3220Test#2 Fall2001 1...

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Name: _______________________________ EE 3220 Test # 2     SSN: _________________________________    Fall 2001 1.) For a BJT, what order of magnitude are the following parameters: a.) β  ~  10 x x = 1, 2, 3, 4   (circle one) b.) r Π  ~ 10 x x = 1, 2, 3, 4   (circle one) c.) r o  ~ 10 x x = 3, 4, 5, 6   (circle one) d.) r x  ~ 10 x x = 1, 2, 3, 4   (circle one) 2.) Why does the bandwidth of a differential amplifier extend higher, and lower (to DC) than  a simple BJT inverting amplifier?  3.) What major advantage does the current mirror have over the BJT current source? 4.) What advantage does the Widlar source have over the current mirror? 5.) Design a current mirror source drive a differential amplifier.  It must produce I o =0.5mA.  Supply voltage V EE  = -5 Volts.  Assume V f  = 0.7 V.  Compute the power absorbed by Q 2

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6.) Given the BJT parameters:  C μ  = 0, r x  = 10, f T  = 450 MHz β F = β o =100  V f  = 0.7  η  = 1,  and r o   =
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