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US 8,552,894 B2Granted
Sigma-delta modulator having a feed-forward path and a hybrid portion
AssigneeMediatek Inc.
InventorsSheng-Jui Huang, Chen-Yen Ho
Life of this patent
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Abstract
A sigma-delta modulator includes a front portion and a hybrid portion to form a loop filter. The front portion includes integrator(s) and feed-forward path(s), and is arranged to provide a front signal by combining signals of the integrator(s) and feed-forward path(s). The hybrid portion is coupled to the front portion, and arranged to provide a filtered signal by combining an integration of the front signal and a weighting of the front signal. The filtered signal is quantized, converted from digital to analog, and fed back to the loop filter.
Claims20
A sigma-delta modulator comprising:
- a front portion comprising:
- a front integrator arranged to provide a first integrated signal according to an integration of an internal signal;
- a feed-forward path arranged to provide a feed-forward signal by weighting the internal signal, wherein the front portion is arranged to provide a summing signal in response to the first integrated signal, and to provide a front signal in response to a combination of the summing signal and the feed-forward signal;
- and
- a hybrid portion coupled to the front portion, and arranged to provide a weighted signal, a second integrated signal and a filtered signal respectively by weighting the front signal, integrating the front signal and combining the weighted signal and the second integrated signal.
2 more elements
A sigma-delta modulator comprising:
- an integration path comprising a plurality of orderly internal ports and a predetermined number of front integrators, each front integrator arranged to direct from one of the internal ports to another internal port of an adjacent stepped-up order;
- a feed-forward path for directing from one of the internal ports to another internal port of a higher order with the predetermined number of front integrators bypassed;
- and
- a hybrid portion comprising an input port coupled to one of the internal ports, an output port, a rear integrator for directing from the input port to the output port, and a weighting path for directing from the input port to the output port with the rear integrator bypassed.
1 more element
Dependencies are inferred from the claim text.