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Unformatted text preview: 1 ECE137A Problem set 7 Q1 Q2 Q3 Q5 Q6 Q7 Q8 Q9 Vcc Ree1 Ree2 Rref Q4 Q1 Q2 Q3 Q5 Q6 Q7 Q8 Q9 Vcc Ree1 Ree2 Rref Q4 Problem 1 : Is6=2Is7. Is5=Is4/3=Is3/4=Is2=3Is1. Vcc is 10 volts. NPNs have beta=200. PNPs have beta=10. Va= infinity. The MOSFETs have a 0.3 V threshold, g ox sat W c v =2 mA/V (use constant- velocity model), and lambda=1/100 volts. . Find Rref so that Ic5=1 mA. Find Ree2 so that Ic2 = 0.1 mA. Ree1=1 kOhm. Find the collector and drain currents of all transistors Vcc-Vee Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 R1 R2 R3 R4 R5 R6 R7 Problem 2: All transistors have beta=200 and Va=100 V. The supplies are +/- 5 V. This is an op-amp….it has to be biased using a feedback network: bias conditions have to be worked assuming that the differential input voltage is whatever is required to make Vout=zero volts DC. Q12 and Q13 are diode- connected transistors. R2 is to have 300 mV DC voltage drop. Ic1=100 uA . Ic9=200 uA....
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This note was uploaded on 08/06/2008 for the course ECE 137AB taught by Professor Rodwell during the Winter '08 term at UCSB.
- Winter '08