Performance of improved tangent type FM demodulator using digital signal processing

Masafumi Hagiwara, Masao Nakagawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

FM demodulators using DSP techniques include the DPLL type, the quadrature type, the tangent type, etc. Compared to their analog counterparts, they are more useful with respect to stability, reliability and convenience of adjustment. However, since the detection characteristics for DPLL or quadrature‐type demodulators are sinusoidal, the introduction of distortion cannot be avoided. In particular, if the input signal is wideband FM, there is a marked deterioration in the characteristics caused by distortion. This paper investigates the tangent‐type FM demodulator whose circuit construction only has in the past been shown and whose characteristics have not been studied at all. It is made clear that the parameter‐setting condition is strictly limited. Next, the detection condition is described and an improved tangent‐type FM demodulator, whose detection characteristics are largely elevated, is represented and its better characteristics are shown. Moreover, comparison is made between this and other types of demodulators by means of simulation, and the effectiveness of this type is shown.

Original languageEnglish
Pages (from-to)66-74
Number of pages9
JournalElectronics and Communications in Japan (Part I: Communications)
Volume67
Issue number10
DOIs
Publication statusPublished - 1984

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Performance of improved tangent type FM demodulator using digital signal processing'. Together they form a unique fingerprint.

Cite this