Single-cycle oversampling analog-to-digital converter
AssigneeLinear Technology Dorporation
InventorFlorin A. Oprescu
Life of this patent
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Abstract
An oversampling delta-sigma analog-to-digital converter suitable for single-cycle operation is provide. In a preferred embodiment of the present invention, only one multiply-accumulate processor is present in the digital filtering stage for decimating the output sequence R(I). A system controller produces precisely timed modulator enable (EnM) and digital filter enable (EnF) signals for coordinating activation of certain circuit elements and for managing power consumption of the system.
Claims44
An oversampling analog-to-digital converter circuit comprising:
- a delta-sigma modulator circuit that receives an analog input signal and converts said analog input signal to modulated digital samples, said delta-sigma modulator circuit having an input and an output;
- a filter circuit coupled to said output of said modulator circuit that receives said modulated digital samples from said modulator circuit and converts said modulated digital samples into a digital output word;
- and
- a system controller circuit coupled to said modulator circuit and said filter circuit that selectively enables and disables said modulator circuit and said filter circuit.
A method for converting analog signals to digital signals comprising:
- modulating said analog signals to create modulated digital samples;
- filtering said modulated digital samples with a digital filter to create a digital output word;
- and
- providing control signals that selectively enable and disable the operation of circuitry that modulates and filters.
A method for making single-cycle analog-to-digital conversions comprising:
- directing modulator circuitry to modulate analog input signals to produce modulated digital samples;
- providing control signals that selectively enable and disable the modulator circuitry and that selectively initializes said modulator circuitry.
Dependencies are inferred from the claim text.