Modulators – Pulse or interrupted continuous wave modulator – Including stabilization or alternatively distortion – noise...
Patent
1998-02-05
1999-06-01
Mis, David
Modulators
Pulse or interrupted continuous wave modulator
Including stabilization or alternatively distortion, noise...
332109, 332123, 332162, 330 10, 455126, H03C 106, H03C 308, H03F 338
Patent
active
059091533
ABSTRACT:
A modulator loop designed to operate in a frequency range of interest is described. The loop includes a loop output terminal and a switching stage, the output of which is coupled to the loop output terminal. The switching stage has a first delay associated therewith. The output of a modulator stage is coupled to the input of the switching stage. A first feedback path is coupled between the loop output terminal and the feedback input of the modulator stage. A feedback filter is coupled between the output of the modulator stage and the feedback input of the modulator stage which compensates for the first delay. The feedback filter is operable to transmit frequencies outside the frequency range of interest and attenuate frequencies in the frequency range of interest.
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H. Ballan, et al., "12V .SIGMA.-.increment. Class-D Amplifier in 5V CMOS Technology, " 1995, Switzerland, IEEE CICC, pp. 559-562.
T. Ritoniemi, et al., "Design of Stable High Order 1-Bit Sigma-Delta Modulators," May 1990, Finland, IEEE Proc., pp. 127-130.
Delano Cary L.
Tripathi Adya S.
Mis David
Tripath Technology Inc.
Villeneuve Joseph M.
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