System and apparatus for reducing the effects of circuit mismatch in analog-to-digital converters
AssigneeFreescale Semiconductor, Inc.
InventorMichael J. McGowan
Life of this patent
Estimating the term…
Abstract
A system and apparatus for reducing the effects of circuit mismatch in analog-to-digital converters is disclosed. In one form, an analog-to-digital converter (ADC) includes a switching network operable to couple an analog input received by a sample and hold module to a folding amplifier operable to process the analog input. The ADC further includes an averaging resistive network coupled to the folding amplifier and operable to provide an output representative of a portion of the analog input received by the folding amplifier to produce a digital representation of the analog input.
Claims21
An apparatus comprising:
- a switching network operable to couple an analog input to a folding amplifier operable to process the analog input;
- and
- an averaging resistive network coupled to the folding amplifier and operable to provide an output representative of a portion of the analog input received by the folding amplifier to produce a digital representation of the analog input.
A system comprising:
- a first folding amplifier stage coupled to a switching network, the switching network operable to receive an analog input from a sample and hold module in response to a sample rate associated with the sample and hold module and at least one voltage level from a reference voltage module;
- and
- a second folding amplifier stage coupled to an averaging resistive network of the first folding amplifier stage, the second folding amplifier stage operable to provide an output representing a portion of the analog input.
A system for converting an analog voltage to a digital output comprising:
- a switching network operable to couple an analog input received by a sample and hold module to a folding amplifier operable to process the analog input;
- an averaging resistive network coupled to the folding amplifier and operable to provide an output representative of a portion of the analog input received by the folding amplifier to produce the digital output;
- a first state operably associated with enabling and disabling one or more transistor switches coupled to an input of the folding amplifier, the first state operable to directly couple the analog input to a pair of input terminals of the folding amplifier;
- and
- a second state operably associated with enabling and disabling the one or more transistor switches coupled to the pair of input terminals, the second state operable to switch the analog input between the pair of input terminals of the folding amplifier.
A method for converting an analog signal to a digital output comprising:
- receiving an analog input from a sample and hold circuit, the sample and hold circuit including a sample rate;
- coupling the analog input to a folding amplifier based on a state of a switching network coupled between the sample and hold circuit and the folding amplifier;
- switching the analog input between a first terminal associated with a differential pair of the folding amplifier to a second terminal associated with the differential pair;
- and
- outputting a current to an averaging resistive network coupled to the folding amplifier, the averaging resistive network operable to provide an interpolated value as an input to a second folding amplifier coupled to the averaging resistive network.
Dependencies are inferred from the claim text.