Saturday, March 21, UCSB0 ECE 92 Projects in Electrical and Computer Engineering Lecture 2.

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Presentation transcript:

Saturday, March 21, UCSB0 ECE 92 Projects in Electrical and Computer Engineering Lecture 2

Transistor Saturday, March 21, UCSB1 The transistor is a three-terminal semiconductor device. Can control electric current or voltage between two of the terminals. Used as amplifier or as switch. Field-Effect Transistors JFET, MESFET Depletion-mode (normally on) n-chp-ch MOSFET Depletion-mode (normally on) Enhancement-mode (normally off) n-chp-chn-chp-ch

JFETs Saturday, March 21, UCSB2 V gs Gate Source Drain I ds (V gs,V ds ) V ds Gate Source Drain N-ch JFET Saturation region I D V gs ≤ V t (cutoff) Ohmic or Triode region V ds V gs = V t V gs = V t V gs = V t V gs = 0 I dss Increasing V gs

MOSFETs Saturday, March 21, UCSB3 V gs Gate Source Drain I ds (V gs,V ds ) V ds Gate Source Drain NMOS Saturation region I D V gs ≤ V t (cutoff) Ohmic or Triode region V ds V gs = V t V gs = V t V gs = V t V gs = V t Increasing V gs

BJTs Saturday, March 21, UCSB4 Base Emitter Collector NPN BJT IbIb Ic=βIBIc=βIB B C E I c,, mA Forward active region V CE 70 μA Increasing I b 60 μA 50 μA 40 μA 30 μA 20 μA 10 μA 0 μA V ce,sat

NMOS and PMOS Saturday, March 21, UCSB5

Example Saturday, March 21, UCSB6 Find W/L and R for the circuit below assuming k n = 100 μA/V 2 (transconductance), V t = 1 V (threshold voltage), and r DS = 40 Ω (drain-to-source resistance).

Op-Amps Saturday, March 21, UCSB7 Active circuit element designed to perform mathematica operations of addition, subtraction, multiplication, division, differentiation and integration. Useful term: gain=amount of amplification produced by an op-amp. Defined as:

Op-Amps Saturday, March 21, UCSB8

Op-Amps Saturday, March 21, UCSB9

Example Saturday, March 21, UCSB VoVo 30 kΩ60 kΩ 30 kΩ V s1 V s2 The switch in the following figure is open. Find v 0 in term of the inputs v s1 and v s2. Repeat with the switch closed.