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Homework 4

# Homework 4 - D520 For the circuits below assume that the...

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Unformatted text preview: D520. For the circuits below, assume that the transistors h measurements made on these circuits labeled voltages and currents. * we have studied npn transistors in class (d from npn in polarities of the currents and volt about +0. 7V, for pnp it is about —0, 7V Boun for npn for less negative or positive V09 the positive or negative Vex the npn transistor is in npn and pnp are different as well. {ti} 5.26. For the circuit below, measurement indic a, B, and VC. If a transistor with B200 is} V b it} k5}. wwwmm ESE 372/Spring 2009 ave very large B. Results of some are indicated in the ﬁgure. Find the values of the other in ﬁgure below). Pnp transistors (a, be cases in ﬁgure below) diﬂer ages. For instance, if for npn transistor in forward active mode V 3,; is duly between saturation and forward active modes is at V0,» about -0 5 V npn transistor is in forward active) but to VCB < +0.5 V for pnp (for less in forward active). The directions 0ftlze collector/emitter/base currents \f < H) V 4 * It} w (1 ix“ 1 V M a g E5 kt? ‘ m m g _ 15 kg} FWWWWM? WW3 3: CNN"; \wwt... L' "““W““" ”mo 1 § ~~~~~ ——-O ( it 1‘ ; 3,4 kit 3 ‘ ll! kt! ’t 5 All If) V H} V ' H? V {C} “i" ates that VB = -l .5V. Assume VBE = 0.7V. Find V5, is used, what values of V3, V5 and Vc result? transistor still operates in the active mode. operates in saturation with a forced B of 1. +5V y high [3. Find the highest value of V3 for which the Also, ﬁnd the value of VB for which the transistor [\J 5.90. Consider circuit below. Use VCC=9V and B= bias point: - Power supply voltage equally split between RC, VCE and RE; ~ Collector current of 3mA; — Voltage divider (i.e. through Rx and R2) current Io about 0.1 *IE. Use the values found to calculate VB, VB, Vc and IQ for transistor with [3:90. Compare with original design targets. 1 (' ‘é .' 00. Design the values of resistors to have at ...
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Homework 4 - D520 For the circuits below assume that the...

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