Analog to digital converter (ADC) with extended dynamic input range
AssigneeBroadcom Corporation
InventorsBruce J. Currivan, Thomas J. Kolze, Lin He, Loke Tan, Ramon Gomez, Francesco Gatta
Life of this patent
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Abstract
A method and apparatus is disclosed to extend a dynamic input range of an analog to digital converter (ADC). A composite ADC may include one or more ADCs. The one or more ADCs compare a signal metric of an analog input signal to quantization levels to produce intermediate digital output signals using one or more non-clipping input values. The composite ADC may select among the one or more intermediate digital output signals based on the signal metric of the analog input signal to produce a final digital output.
Claims19
A composite analog to digital converter (ADC) to convert an analog input to a digital output signal, comprising:
- a first ADC, corresponding to a first non-clipping input value at which the first ADC saturates or clips, configured to convert the analog input to a first intermediate digital signal;
- a second ADC, corresponding to a second non-clipping input value at which the second ADC saturates or clips, configured to convert the analog input to a second intermediate digital signal, the second non-clipping input value being greater than the first non-clipping input value;
- and
- a combining logic module configured to select the first intermediate digital signal or the second intermediate digital signal based on a signal metric of the analog input to produce the digital output signal.
A composite analog to digital converter (ADC) to convert an analog input to a digital output signal, comprising:
- a first scaling module to divide the analog input by a first scaling factor to produce a first scaled analog input;
- a first ADC corresponding to a non-clipping input value configured to convert the first scaled analog input to produce a first scaled digital output signal;
- a second scaling module to multiply the first scaled digital output signal by the first scaling factor to produce a first intermediate digital signal;
- a third scaling module to divide the analog input by a second scaling factor to produce a second scaled analog input;
- a second ADC corresponding to the non-clipping input value configured to convert the second scaled analog input to produce a second scaled digital output signal;
- a fourth scaling module to multiply the second scaled digital output signal by the second scaling factor to produce a second intermediate digital signal;
- and
- a combining logic module configured to select the first intermediate digital signal or the second intermediate digital signal based on a signal metric of the analog input to produce the digital output signal.
A composite analog to digital converter (ADC) to convert an analog input to a digital output signal, comprising:
- a first scaling module to divide the analog input by a first scaling factor to produce a first scaled analog input;
- a second scaling module to divide the analog input by a second scaling factor to produce a second scaled analog input;
- a first combining logic module configured to select the first scaled analog input or the second scaled analog input based on a signal metric of the analog input to produce a final scaled analog input;
- an ADC including a non-clipping input value configured to convert the final scaled analog input to produce a composite digital output signal;
- a third scaling module to multiply the composite digital output signal by the first scaling factor to produce a first intermediate digital signal;
- a fourth scaling module to multiply composite digital output signal by the second scaling factor to produce a second intermediate digital signal;
- and
- a combining logic module configured to select the first intermediate digital signal or the second intermediate digital signal based on the signal metric of the analog input to produce the digital output signal.
Dependencies are inferred from the claim text.