Show Menu
Cheatography
  1. Home >
  2. Education >

Semiconductors Cheat Sheet by

Covers chapters 1, 2, & 18 of EE 331

Voltage Amplifier

Vi = Vs * (Ri / (Ri + Rs))
Vo = AvoVi * (RL / (RL + Ro))
Ideal op-amp:
Ri = infinity
Ro = 0
RL = Rs = 0 affect on gain

Four Amplifier Models

Voltage Amplifier
Current Amplifier
Av = Vo / Vi
Ri = infinity
Ro = 0
Av = io / ii
Ri = 0
Ro = infinity
Transc­ond­uctance Amp
Transr­esi­stance Amp
Gm (i dep.) = io / Vi
Ri = infinity
Ro = infinity
Rm (v dep.) = Vo / ii
Ri = 0
Ro = 0

Source Transf­orm­ation

Avo = Ais * (Ro / Ri) = Gm * Ro = Rm / Ri

Inverting vs. Non-In­verting Op-Amp

Inverting Op-Amp
Av = Rf / Ri
Non-In­verting Op-Amp
Av = 1 + Rf / Ri

Astable Multiv­ibrator

τ = CR
T = 2τ * ln[(1 + β) / (1 - β)]
β = R1 / (R1 + R2)
  

Gain in dB

Av = 20log|Av| dB
Ai = 20log|Ai| dB
Pg = 10log|Pg| dB

Differ­ential Amplifier (CMRR)

20log|Ad / Acm| = 20log|­(K+1) / δ| = 20log|­(K+1) / (4*ε)|
δ = mismatch
ε = tolerance
Ad = R2 / R1 = R4 / R3 = K

Vcmi = 0.5(V1 + V2)
V1 = Vcmi - 0.5Vdi
V2 = Vcmi + 0.5Vdi

555 Timer (Monos­table)

T = CR * ln3 ~= 1.1CR
VTH = Vcc(1 - eT/CR)
  

Amplifier Class

A: Full wave, θc = 360 deg.
B: Halfwave θc = 180 deg.
C: Between A & B class, θc < 180 deg.
D: Small wave

Bistable Multiv­ibrator

β = R1 / (R1 + R2)
VTH - VTL = β(L+ - L-)

VTL = -L+ (R1 / R2)
VTL = -L- (R1 / R2)

555 Timer (Astable)

Duty Cycle = (RA + RB) / (RA + 2RB)
T = 0.69C(RA + 2RB)
               
 

Metadata

  • Languages:
  • Published: 18th September, 2024

Comments

No comments yet. Add yours below!

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.

          Related Cheat Sheets

          ANDES for Power System Simulation Cheat Sheet
          Boolean Algebra Laws Cheat Sheet
          Physics - Units and dimensions Cheat Sheet