What is the significance of high Q-value circuits ?

Explanation

As is known, the Q factor of Quality factor of an electronic circuit defines sharpness of turning at reasonance. It is given by `Q = (1)/(R ) sqrt((L)/(C ))`
Q is only a numbe having no dimensions. It represents voltages amplification factor of the circuit At the receiving station, many radio signals are oftern present over a range of frequencies. In order to eliminate unwanted signals, we need to design high Q value circuit. Higher the value of Q, narrower and sharper is the resonance. Thus the electronic circuits with high Q values would respond to a very narrow range of frequencies. The value of Q usually vary from 10 to 100. The electronic circuits dealing with very high frequencies may have `Q = 200`.