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Consider an inverting amplifier with a nominal gain of 1000 constructed from an op amp with an input offset voltage of 3 mV and with output saturation levels of ±10 V. What is (approximately) the peak sinewave input signal that can be applied without output clipping?
The maximum that can be sent without clipping is 10V – 1000 X 3mV or 7V.
(Q2 & Q.3) Consider an inverting amplifier with a nominal gain of 1000 constructed from an op amp with an input offset voltage of 3 mV and with output saturation levels of ±10 V. If the effect of V_{Os}(input offset voltage) is nulled at room temperature (25_{0}C), how large an input can one now apply if:
Q. The circuit is to operate at a constant temperature?
Explanation: Maximum signal that will not be clipped is 10mV because 10mV X 1000 = 10V.
The circuit is to operate at a temperature in the range 0°C to 75°C and the temperature coefficient of V_{OS} is 10 μV/°C?
Since the effect is nullified at 25_{o}C, the peak that can be sent now is given by 10 – (7525) X 0.1 mV.
One of the DC imperfections of the amplifiers are dc offset voltage which is
DC offset voltage is existence of output signal even when the differential signal is zero.
For the amplifier shown determine the value of the bias current (I_{b}) and input offset current (I_{o}) respectively.
Standard mathematical expressions are used with the given variables.
Consider the circuit shown below which reduces the impact of the input bias current. If I_{B1} = I_{B2} = Input bias current, then determine the value of R_{3} so that the output voltage (v_{0}) is not impacted by the input bias current.
This will be possible when R_{3} has the same value as the net effect of R_{1} and R_{2}.
Consider an inverting amplifier circuit designed using an op amp and two resistors, R_{1} = 10 kΩ and R_{2} = 1 MΩ. If the op amp is specified to have an input bias current of 100 nA and an input offset current of 10 nA, find the output dc offset voltage resulting.
Use the mathematical definition of bias current and offset current.
(Q.8Q.10) Consider a Miller integrator with a time constant of 1ms and an input resistance of 10 kΩ. Let the op amp have VOS (offset voltage) = 2 mV and output saturation voltages of ±12 V.
Q. Assuming that when the power supply is turned on the capacitor voltage is zero, how long does it take for the amplifier to saturate?
Use v_{O} = V_{OS}
(V_{OS}/CR)t.
Select the largest possible value for a feedback resistor RF so that at least ±10 V of output signal swing remains available.
Use v_{O} = V_{OS}
(V_{OS}/CR)t.
What is the corner frequency of the resulting STC network?
The required answer is given by 1/6 Hz.
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