# What is a frequency response curve of an amplifier?

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## What is a frequency response curve of an amplifier?

frequency response curve: A plot of the gain or attenuation of a device, such as an amplifier or a filter, as a function of frequency. Note: A flat curve indicates a uniform gain or attenuation over the range of frequencies for which the curve is flat.

What is frequency response of RC coupled amplifier?

Frequency Response of RC Coupled Amplifier From the above graph, it is understood that the frequency rolls off or decreases for the frequencies below 50Hz and for the frequencies above 20 KHz. whereas the voltage gain for the range of frequencies between 50Hz and 20 KHz is constant.

### What is direct coupled amplifier draw the circuit diagram and frequency response of direct coupled amplifier?

A DC amplifier (direct coupled amplifier) can be defined as is a kind of amplifier where the one stage output of the amplifier can be connected to the next stage input for allowing the signals without frequency. So this is named as the direct current which passes from input to output.

What is a frequency response curve?

A frequency-response curve of a loudspeaker is defined as the variation in sound pressure or acoustic power as a function of frequency, with some quantity such as voltage or electrical power held constant.

#### What is a good frequency response for an amplifier?

A well designed and built output transformer can reach 50kHz without peaking. So a frequency response of 5Hz-50kHz, within 1dB limits, is common, and 20Hz-20kHz is the narrowest acceptable result. Some amplifiers have flat frequency response over a much wider bandwidth, but this is rare.

Why the cutoff is taken at 3dB down frequency?

to determine the bandwidth of signal, when decrease the voltage from maximum to 0.707Max or decreasing the power from max to half power.

## What is the example of direct coupled amplifier?

Direct-coupled amplifiers are used in TV receivers, computers, regulator circuits and other electronic instruments. It also forms a building block for differential amplifiers and operational amplifiers.

What is the frequency response of a RC coupled amplifier?

The frequency response of a RC coupled amplifier is as shown in the following graph. From the above graph, it is understood that the frequency rolls off or decreases for the frequencies below 50Hz and for the frequencies above 20 KHz. whereas the voltage gain for the range of frequencies between 50Hz and 20 KHz is constant.

### When do you use a direct coupled amplifier?

The other type of coupling amplifier is the direct coupled amplifier, which is especially used to amplify lower frequencies, such as amplifying photo-electric current or thermo-couple current or so. As no coupling devices are used, the coupling of the amplifier stages is done directly and hence called as Direct coupled amplifier.

What are the disadvantages of a RC coupled amplifier?

The following are the disadvantages of RC coupled amplifier. The voltage and power gain are low because of the effective load resistance. They become noisy with age. Due to poor impedance matching, power transfer will be low.

#### Where does the amplified signal go in a coupling amplifier?

When an AC input signal is applied to the base of first transistor, it gets amplified and appears at the collector load R L which is then passed through the coupling capacitor C C to the next stage. This becomes the input of the next stage, whose amplified output again appears across its collector load.