How does frequency affect amplifier?
As such for any electronic circuit, the behavior of amplifiers is affected by the frequency of the signal on their input terminal. This characteristic is known as the frequency response. In the frequency range that amplifiers have been designed for, they must deliver a constant and acceptable level of gain.
What will happen in an amplifier if the input signal is too large?
When the input amplitude becomes too large, the clipping becomes substantial and forces the output waveform signal to exceed the power supply voltage rails with the peak (+ve half) and the trough (-ve half) parts of the waveform signal becoming flattened or “Clipped-off”.
How is the behavior of an amplifier affected?
As such for any electronic circuit, the behavior of amplifiers is affected by the frequency of the signal on their input terminal. This characteristic is known as the frequency response. Frequency response is one of the most important property of amplifiers.
What is the response range of an amplifier?
Figure 7.1 shows the response of amplifier gain with the frequency of input signal. The response range can be divided into low- frequency range, mid-frequency range, and high-frequency range. fL is the low critical frequency where the effect of low frequency begins to be significant.
Is the gain of an amplifier significant at low frequency?
However, owing to the presence of bypass and coupling capacitors in the amplifier circuitry, the effect to the gain of amplifier can be significant at low frequency. Similarly, the effect to the gain can be significant at high frequency too due to presence of internal capacitance of the BJT, JFET or MOSFET devices.
How are the input and output impedances of amplifiers determined?
The input and output impedances values are fully given by the architecture of the amplifiers. We can list some of the architectures that are available in order to modify the input or output impedances : FET input stage : Field Effect Transistors such as the MOSFET can be used to connect the source to the preamplifier.