A new PLL-FM modulator with rapid acquisition time

Author

Kajiwara, Akihiro ; Nakagawa, Masao

Author_Institution

Dept. of Electr. Eng., Keio Univ., Yokohama, Japan

fYear

1990

fDate

1-3 May 1990

Firstpage

2917

Abstract

A phase locked loop (PLL) FM modulator which has a frequency acquisition speed faster than 60 μs and a lower cutoff modulation frequency below a few Hz is presented. The PLL-FM modulator is composed of digital signal processing components for a voltage-controlled oscillator (VCO). The phase error signal at the phase comparator is derived by the subtraction between a reference phase component and a feedback phase component. Therefore, it is able to have about 10³ times faster acquisition speed than conventional PLL-FM modulators because the low-pass filter used in those is not needed

Keywords

comparators (circuits); frequency modulation; modulators; phase-locked loops; variable-frequency oscillators; PLL-FM modulator; digital signal processing components; feedback phase component; frequency acquisition speed; lower cutoff modulation frequency; phase comparator; phase error signal; phase locked loop; rapid acquisition time; reference phase component; voltage-controlled oscillator; Communication switching; Communication system control; Cutoff frequency; Digital signal processing; Error correction; Fluctuations; Frequency locked loops; Frequency modulation; Phase modulation; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1990., IEEE International Symposium on

Conference_Location

New Orleans, LA

Type

conf

DOI

10.1109/ISCAS.1990.112621

Filename

112621