Design and Implementation of PLL for Frequency Demodulation
MA. Jihan S. Abdaljabar1, HaithamK.Ali2
1MA.Jihan S. Abdaljabar, Communication Department, Sulaimani Polytechnic University, Collage of Engineering, Iraq.
2Ass. Prof. PhD. Haitham K.Ali, Communication Department, Sulaimani Polytechnic University, Collage of Engineering, Iraq.
Manuscript received on March 12, 2016. | Revised Manuscript received on March 27, 2016. | Manuscript published on May 05, 2016. | PP: 13-17| Volume-6 Issue-2, May 2016. | Retrieval Number: F2788015616
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Frequency modulation is widely used in radio transmissions, especially, in the broadcasting of VHF frequencies to provide medium for high quality audio transmissions. Phase locked loop, PLL FM demodulator or detector is a form of FM demodulator that has gained widespread acceptance in recent years. In this paper, PLL FM detectors were designed from the PLL integrated circuits where the frequency demodulation was obtained directly from the PLL circuit by taking the center frequency of the PLL todesign the FM carrier frequency. The PLL was operated as a complete IF strip, limiter, and detector employed in FM receivers. The essential parts of the FM demodulation system, which are (demodulator unit), (RF unit) and (audio unit),were designed by hardware and the designed parts were examined. As a result the output waveform for every part was measured in order to ensure that the design is compatible with the required conditions.
Keywords: FM demodulator, IF strip, PLL, RF unit.