Loop filter for a continuous time sigma delta analog to digital converter
AssigneeInfineon Technologies AG
InventorsAndreas Wiesbauer, Martin Clara, Antonio Di Giandomenico, Luis Hernandez, Susana Paton
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Abstract
A loop filter for a continuous time sigma delta analog to digital converter which converts an analog input signal into a digital output signal, said loop filter comprising an active analog filter which includes active devices for providing a power gain, wherein the number of active devices is lower than the filter order of said active analog filter.
Claims20
A loop filter for a continuous time sigma delta analog to digital converter which converts an analog input signal into a digital output signal, the loop filter comprising:
- an input having an input signal, the input signal at least in part representative of the digital output signal of the sigma delta analog to digital converter;
- an active analog filter operably coupled to the input, the active analog filter including a first number of active devices for providing a power gain, the active analog filter being of an Nth order, wherein N exceeds the first number of active devices.
A sigma delta analog-digital-converter which converts an analog input signal to a digital output signal,
- comprising:
- a loop filter which comprises an active analog filter, the active analog filter that includes a first number of active devices providing a power gain, the first number of active devices lower than a filter order of said active analog filter;
- and
- a quantizer which quantizes a loop filter output signal of said active loop filter to generate said digital output signal.
Dependencies are inferred from the claim text.