Single point modulator having a PLL circuit

Details Single point modulator having a PLL circuit Single point modulator having a PLL circuit

2004-08-12

2008-11-18

Mis, David (Department: 2817)

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

C331S016000

Reexamination Certificate

active

07453325

ABSTRACT:
A single-point modulator (1) has a PLL circuit (2) and a programmable frequency divider (7) whose control connection is connected to a circuit branch for injecting a digital modulation signal (15) which is arranged in the feedback path of the PLL circuit (2). The circuit branch contains a sigma-delta modulator (9) which, in turn, has a digital filter (24) having a transfer function H(z). The noise transfer function NTF(z) of the sigma-delta modulator (9) is given by the function NTF(z)=1−H(z).

REFERENCES:
patent: 5629701 (1997-05-01), Ritoniemi et al.
patent: 5959562 (1999-09-01), Wiesbauer
patent: 5986512 (1999-11-01), Eriksson
patent: 6236703 (2001-05-01), Riley
patent: 199 29 167 (2000-12-01), None
patent: 0 940 922 (1998-03-01), None
J.C. Candy; “A Use of Double Integration in Sigma Delta Modulation”; IEEE Transactions on Communications, vol. COM-33, No. 3, pp. 249-258, Mar. 1985.
M. Perrott et al.; “A 27-mW CMOS Fractional-N Synthesizer Using Digital compensation for 2.5-Mb/s GFSK Modulation”; IEEE Journal of Solid-State Circuits, vol. 32, Edition 12, pp. 2048-20060, 1997.
U. Tietze et al.; “Halbleiter-Schaltungstechnik”; Springer-Verlag, 11 edition; pp. 1140-1144, 1999.

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