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US 8,947,285 B2Granted
ADC with noise-shaping SAR
AssigneeInfineon Technologies AG
InventorJose Luis Ceballos
Life of this patent
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Abstract
Representative implementations of devices and techniques provide analog to digital conversion of analog inputs. A multistage comparator using a feed-forward technique can provide noise shaping of conversion errors. For example, the comparator may feed a conversion error forward from a first stage to a next stage of the multistage comparator.
Claims25
An apparatus, comprising:
- a first stage arranged to receive an analog input and to perform a first conversion based on the analog input;
- a delay component arranged to receive and delay a conversion error of the first conversion, based on a predetermined delay;
- a combiner arranged to receive an output of the first stage and to combine the output with the error to form an input of a next stage;
- and
- a next stage arranged to receive the output of the first stage combined with the error, and to perform a conversion based on the output of the first stage and the error, an output of the next stage resulting in a digital approximation of the analog input.
2 more elements
A system, comprising:
- a quantizer arranged to convert an analog input signal to a digital approximation, the quantizer including:
- a multistage comparator arranged to acquire an analog to digital conversion error at a first conversion cycle of a first stage and to feed the error forward, combining the error with an output of the first stage during a subsequent conversion cycle to form an input to a next stage, the digital approximation based on the subsequent conversion cycle at the next stage;
- and
- a digital to analog converter arranged to convert the digital approximation to an analog value.
1 more element
A method, comprising:
- acquiring an analog to digital conversion error from a first conversion cycle of a first stage of an analog to digital converter (ADC) comparator;
- combining the error with an output of the first stage during a subsequent conversion cycle to form an input to a next stage of the ADC comparator;
- and
- outputting a digital output value based on a conversion of the input at the next stage.
1 more element
Dependencies are inferred from the claim text.