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US 2004/0169596 A1Published application
Higher order sigma-delta analog-to-digital converter based on finite impulse response filter
AssigneeTexas Instruments Incorporated
InventorJinseok Koh
Life of this patent
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Abstract
A sigma-delta ADC includes a higher order infinite impulse response (IIR) filter based on a finite impulse response (FIR) filter and possesses the same functionality as a conventional sigma-delta ADC in terms of noise and swings at the output of the analog integrators. The higher order sigma-delta ADC requires only one analog amplifier however, even though it has a higher order analog integration function.
Claims10
A sigma-delta analog-to-digital converter (ADC) comprising:
- an infinite impulse response (IIR) filter having no more than one analog amplifier and further having an order greater than one and operational to generate a plurality of output signals;
- a digital filter operational to filter out up-converted frequency quantization noise associated with at least one IIR filter output signal and generate a low frequency feedback signal therefrom;
- and
- no more than one summing node, wherein the single summing node operates to sum the plurality of output signals and the low frequency feedback signal.
1 more element
A method of analog-to-digital conversion, the method comprising the steps of:
- providing a sigma-delta analog-to-digital converter (ADC) having no less than a second order infinite impulse response (IIR) filter and possessing no more than one analog amplifier;
- and
- converting an analog input signal to a digital signal to achieve a level of functionality substantially identical to a conventional sigma-delta ADC having more than one analog amplifier in terms of noise and swings at the output of the associated analog integrators.
Dependencies are inferred from the claim text.