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EE2B > Op Amps > Flashcards

Op Amps Flashcards

1
Q

What is the gain defined as?

A

A = Vout/Vin

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2
Q

What input resistance/impedance?

A

Rin = Vin / Iin (impedance r)

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3
Q

What does Vin equal?

A

(Vout*Rin)/(Rin+Rs)

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4
Q

Define voltage swing

A

The max and min voltage, determined by the power supply

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5
Q

What are the three golden rules/common assumptions for ideal op-amps?

A

1) V+ = V-
2) I+ = I- = 0
3) Output voltage is whatever it has to be to satisfy 1 and 2

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6
Q

What is Vout when no feedback is applied?

A

Vout = A0 ( V+ - V_)

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7
Q

What is the first order approximation of open loop gain vs frequency?

A

A0(f) = K/jw = K/s

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8
Q

What is the gain bandwidth product equal to?

A

Cut off freq * designed gain

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9
Q

What is the cut off frequency

A

The intersection of the low and high frequency asymptotes
The –3dB point
The gain-bandwidth product divided by the mid-band gain

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10
Q

What is the slew rate?

A

Maximum rate of change of voltage associated with the output for an op-amp

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11
Q

How do you avoid slew rate limiting?

A

dvout/dt &laquo_space;SR

2pi*fA &laquo_space;SR

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12
Q

Define full power bandwidth

A

max frequency at which an undistorted sine wave output can be obtained

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13
Q

What is saturation?

A

V out cannot exceed the supply voltages so levels off at v max and v min

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14
Q

Why would you use hysteresis?

A

To provide some resilience against noise

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15
Q

What do you ideally want the voltage swing to equal?

A

Vmax = 2Vs

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16
Q

What happens to the voltage swing if there is a significant DC offset in the output voltage?

A

Vmax = 2 (Vs - V off)

17
Q

Why is negative feedback used?

A
  • To minimise error

- to compensate for non ideal properties

18
Q

What is the closed loop gain?

A

A (v) = Vout/ Vin

= 1 + R2/R1

19
Q

What is the point of a buffer amplifier?

A

Negative feedback loop insures that inputs impedances are the same

20
Q

What is the output impedance?

A

rout = Rout Av/ A0

21
Q

What is the threshold voltage?

A

V thresh = +/- V sat R1/ R1R2 + VrefR2/R2R1

22
Q

What is an oscillator circuit?

A

A schmidt trigger with a capacitor and restore

23
Q

What does Vr(t) equal in an oscillator circuit?

A

Vr(t) = e^(-t/RC)

24
Q

What does Vc(t) equal in an oscillator circuit?

A

Vc(t) = Vs- (vs-vc) e^(-t/RC)

25
Q

What is the aiming potential?

A
  • When Vc tends to Vs as t tends to infinity. Vc(infinity) is known as the aiming potential
  • will be + Vsat or - Vsat
26
Q

What is the value of input impedance for an ideal operational amplifier?

A

Infinite

27
Q

What is the value of output impedance for an ideal operational amplifier?

A

Zero

28
Q

What is the value of open loo gain for an ideal operational amplifier?

A

Infinite

EE2B (3 decks)

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