Lecture8a - Lecture 8. TRANSISTOR INVERTERS Topics: BJT...

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Lecture 8. TRANSISTOR INVERTERS Objectives: Topics: Determine inverter gains Obtain the transfer characteristic Design inverter circuits for given specifications BJT Inverter MOSFET Inverter CMOS Inverter
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Inverter Used in digital and analog applications: - voltage amplifiers - differential amplifiers -operational amplifiers - digital logic circuits 3-terminal device needed (FET or BJT) Voltage-processing unit: BJT Inverter (example from last lecture) V IN =0.8V, 1.1V. v OUT -? β F =200 B F C CC C C CC OUT i R V i R V v β = = Assume C.C.R. B f IN B R V v i = a) V IN =0.8V: b) V IN =1.1V: Inverter gain:
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The Transfer Characteristic of a BJT Inverter 1 v IN , V 0 10 5 v OUT , V a b c d Cutoff C.C.R. Satur. - obtained in an example of the previous lecture graphically (using v-i curves and load line) The same could be obtained analytically a) Cutoff region (point a): b) Saturation region (point d): v OUT =v CE =V sat =0.2V Solve for v IN : B C F sat CC f IN R R V V V v β + = c) C.C.R. (points b and c):
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EXAMPLE β F =50, v IN – signal from a thermocouple
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Lecture8a - Lecture 8. TRANSISTOR INVERTERS Topics: BJT...

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