Multilevel FSK modulator having phase locked loop with controlle

Details Multilevel FSK modulator having phase locked loop with controlle Multilevel FSK modulator having phase locked loop with controlle

1993-06-16

1994-07-12

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

332127, 375 48, 375 62, 375 66, H04L 2712

Patent

active

053292588

ABSTRACT:
A multilevel frequency-shift keying (FSK) modulator is disclosed in which the transient response for frequency transition can be easily set. The modulator is of a type in which a frequency generated by a voltage-controlled oscillator (VCO) is changed in accordance with multilevel code and is phase-locked by a phase-locked loop (PLL). The modulator is provided with a phase-lock feedback circuit that, combined with a VCO, makes up a PLL, and includes first and second VCOs and a filter having a desired transient response characteristic. At a transient time of frequency transition due to a change of the multilevel code, the first VCO and feedback circuit makes up the PLL, and a first control voltage for the first VCO produced in the PLL is inputted as a second control voltage to the second VCO through the filter. Accordingly, the FSK signal delivered from the second VCO has a transient response characteristic depending on the characteristic of the filter, and as a result, the transient response characteristic of the FSK modulator can be set to a desired characteristic by modifying the characteristic of the filter without changing the other circuit parameters.

REFERENCES:
patent: 4068198 (1978-01-01), Otto
patent: 5111162 (1992-05-01), Hietala et al.
patent: 5130676 (1992-07-01), Mutz
European Telecommunications Standards Institute, "Paging Systems; European Radio Message System (ERMES), Part 6: Base Station Conformance Specification", Oct. 1991.

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