Common-mode rejection ratio is given by
The correct answers are:
If Av(d) = 3500 and ACM = 0.35, then CMRR is :
Expressed in dB
= 80 dB
The correct answers are: 10000, 80 dB
If a certain Op-Amp has a closed loop gain of 20 and an upper critical frequency of 10 MHz, the gain bandwidth product is :
GBW= 20 x 10 = 200MHz and gain bandwidth product is also defined as the frequency with unity gain.
The correct answers are: 20 MHz, unity gain frequency
The Op-Amp has the following parameters; Aol = 50000; Zin = 4MΩ and Zout = 50Ω. The values of input impedance, output impedance and close loop voltage gains are :
The feedback attenuation B is
zero for all practical purposes. The closed loop voltage gain is.
The correct answers are: Zout = 980mΩ, Acl(t) = -100
The circuit shown in the figure can be used as a
The given circuit is
It is an integrator and low-pass filter.
The correct answers are: low pass filter, Integrator
The inverting input terminal of an operational amplifier (Op-Amp) is shorted with output terminal apart from being grounded. A voltage signal V1 is applied to the noninverting input terminal of the Op-Amp. Under this configuration the Op-Amp function is as :
The lowest gain can be obtained from a non-inverting amplifier with feedback 1.
When the non-inverting amplifier is configured for unit gain, it is called a voltage follower because the output voltage is equal to and in phase with the input. In other words, in the voltage follower, the output follows the input. To obtain the voltage follower from non-inverting amplifier of figure 1. simply open R1 and short Rf The resulting circuit is shown is figure 2. In this figure, all the output voltages are feedback into the inverting terminal of the Op-Amp ; consequently the gain of the feedback is 1.
The correct answer is: a voltage follower
A differential amplifier.
Any differential amplifier has two inputs and two outputs (one is Vout and other is ground potential) The correct answers are: is a part of an Op-Amp, has two output
The data of Op-Amp shown in figure is.
Zin = 2MΩ, ZOut = 75Ω and AoI = 200000, then the correct matching pairs is.
The attenuation, B, of the feedback circuit is
= [1 + (200000)(0.0435)](2MΩ)
= 17.4 GΩ
The correct answers are: Attenuation of the feedback = +0.0435, Input impedance = +17.4 GΩ
In order to obtain a solution of the differential equation
involving voltage V(t) and V1 an Op-Amp circuit would require at least.
Since, it is a two degree linear differential equation, hence, two integrators are required, also one adder to calculate the sum of outputs.
The correct answers are: two Op-Amp integrator , one Op-Amp adder
A certain Op-Amp has an open loop voltage gain of 1,00,000 and a common mode gain of 0.2. The CMRR is :
Aol = 100000
Acm = 0.2
Expressed in decibels
The correct answers are: 500000, 114 dB