Answers and Replies. Opamp maintain the close loop gain because it has high open loop gain at low frequency. But as you increase the input frequency, the open loop gain decrease, you need more input differential voltage to produce the same output, this will cause error and the gain start to roll off.

Bandwidth of an amplifier may be increased by lowering the lower cut-off frequency and/or increasing the upper cut-off frequency.

Feedback reduces the overall gain of a system with the degree of reduction being related to the systems open-loop gain. Negative feedback also has effects of reducing distortion, noise, sensitivity to external changes as well as improving system bandwidth and input and output impedances.

You give square wave as an input to op amp, the output will be a square wave. So there is no effect of input on output as op amp does not sustain the original information. So a closed loop op amp is used so that we get the correct output. That is we are reducing the gain of op amp.

Background: Gain-bandwidth product: The forward gain, G is defined as the gain of the op-amp when a signal is fed differentially into the amplifier with no negative feedback applied. This gain is ideally infinite at all frequencies, but in a real op-amp is finite, and depends on the frequency.

The frequency where GCL falls below the ideal gain is called the closed-loop bandwidth fc. CIRCUIT INSIGHT Run a simulation of OP_BANDWIDTH1. CIR. The closed-loop gain for this circuit is GCL = (10k+10k)/10k = 2 V/ V.

The bandwidth of a closed-loop control system is defined as the frequency range where the magnitude of the closed loop gain does not drop below −3 dB as shown in Figure 6.54.

In servo drives, the bandwidth of a control loop is defined as the frequency at which the closed-loop amplitude response reaches -3 dB. At this point, the output gain (ratio of output to input) equals approximately 70.7% of its maximum, and the output power (power delivered to the load) equals 50% of the input power.

Define full power bandwidth. Answer: It is defined as the maximum frequency at which the op-amp will yield an undistorted ac output with the largest possible signal amplitude. The amplitude is dependent on the type of op-amp and the power supplies.

The half-power point or half-power bandwidth is the point at which the output power has dropped to half of its peak value; that is, at a level of approximately -3 dB. In filters, optical filters, electronic amplifiers, the half-power point is a commonly used definition for the cutoff frequency.

Any amplifier should ideally have a bandwidth suited to the range of frequencies it is intended to amplify, too narrow a bandwidth will result in the loss of some signal frequencies, too wide a bandwidth will allow the introduction of unwanted signals, in the case of an audio amplifier for example these would include …

The Bandwidth (BW) of an amplifier is defined as the difference between the frequency limits of the amplifier. Complete step by step answer: The range of frequencies within a band is known as bandwidth. An amplifier also known as an amp is an electronic device that enhances the power of a signal.

As the frequency increases, the capacitive reactance becomes smaller. This cause the signal voltage at the base to decrease, so the amplifier’s voltage gain decreases.

The gain of the transistors falls at higher frequency due to the parasitic capacitance. Why is it so? Join ResearchGate to ask questions, get input, and advance your work.

Why IC 741 is not used for high frequency applications? IC741 has a low slew rate because of the predominance of capacitance present in the circuit at higher frequencies. As frequency increases the output gets distorted due to limited slew rate.

The 741 is a general-purpose basic Opamp. It is not designed for high-frequency applications. It does not have high unity-gain bandwidth. It also does not have high precision.

Answer: The drawback of IC 741 is its low slew rate (0.5v/µs), which limits its use in relatively high frequency applications, especially in oscillators, comparators and filters.

Amplifiers: 741 IC is mostly used to amplify signals of varying frequencies ranging from DC to higher radio frequencies. It is also used in frequency selective amplifiers which filter out signals of unwanted frequencies, E.g. tone control systems in stereo and Hi Fi systems.