Investigation Of A Turner Circuit Essay Example | Topics and Well Written Essays - 1750 words

Investigation Of A Turner Circuit - Essay Example The lab report is detailed on the testing as well the design used in the construction of a tuner circuit. Being that students are supposed to actively take part in the practical in terms of setting frequencies before checking output waveforms, they become better at understanding the operation of the tuner circuit. In this report, therefore, emphasis is on assessing a tuner circuit in order to understand its features better. A circuit allowing an output only at a given frequency forms a tuner circuit. The use of a turner circuit is mainly in the communications industry for selecting of channels. Besides, it plays the role of a sub-system in that it concerts selected carrier frequency as well as its bandwidth into a fixed frequency that is in turn proper in processing from the received radio frequencies (RF). The AM/FM broadcast transmissions then feed the demodulator with the intermediate frequency (IF) and the demodulator in turn converts the radio signal into audio-frequency signals that enable driving a loudspeaker. Applications of wider frequency bandwidth are in transmissions that are more complicated such as DVB-S/DVB-T/DVB-D in digital TV, PAL/NTSC in TV and DAB for digital radio. Frequency bandwidths are equally transmitted as IFs with the use of several sub-carriers in the receiver. If the whole bandwidth undergoes sampling with A/D at a faster rate, the sub-carrier processing takes place (Learn about Electronics.com, 2011). The expected rate is at least twice the IF frequency.