Active filter configured to suppress out-of-band peaking and an analog-to-digital converter using the same
AssigneeIntel Corporation
InventorsMatteo Camponeschi, Lukas Doerrer, Patrick Torta
Life of this patent
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Abstract
An active filter and an analog-to-digital converter (ADC) configured to suppress out-of-band peaking. An active filter may include an active device configured to provide a power gain to an input signal, a feedback network configured to connect an output of the active device to an input of the active device, and an input impedance network configured to couple the input signal to the input of the active device. A combination of the feedback network and the input impedance network is configured to provide frequency response properties of the active filter such that a frequency domain signal transfer function of the active filter has a constant in numerator.
Claims18
An active filter, comprising:
- an active device configured to provide a power gain to an input signal;
- a feedback network configured to couple an output of the active device to an input of the active device;
- and
- an input impedance network configured to couple the input signal to the input of the active device,
- wherein a combination of the feedback network and the input impedance network is configured to provide frequency response properties of the active filter such that a numerator of a frequency domain signal transfer function of the active filter is a constant,
- wherein the input impedance network has a linear s-polynomial in a numerator of an s-domain impedance of the input impedance network.
A sigma delta analog-to-digital converter, comprising:
- a loop filter;
- a quantizer;
- and
- a digital-to-analog converter,
- wherein the loop filter comprises:
- an active device configured to provide a power gain to an input signal;
- a feedback network configured to connect an output of the active device to an input of the active device;
- and
- an input impedance network configured to couple the input signal to the input of the active device,
- wherein a combination of the feedback network and the input impedance network is configured to provide frequency response properties of the loop filter such that a numerator of a frequency domain signal transfer function of the loop filter is a constant,
- wherein the input impedance network has a linear s-polynomial in a numerator of an s-domain impedance of the input impedance network.
Dependencies are inferred from the claim text.