Subranging ADC buffer cascade
AssigneeAnalog Devices, Inc.
InventorAndrew Joseph Thomas
Life of this patent
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Abstract
An analog-to-digital converter (ADC) system, such as a subranging ADC, including a cascade of buffer circuits and signal processing circuitry to measure and cancel the distortion introduced by the buffer circuits. Thus, buffer circuits can be added to the signal path of an input signal without the detrimental effects, such as added distortion, that typically accompany the addition of buffers.
Claims20
A analog-to-digital converter (ADC) system with disturbance reduction, the ADC system comprising:
- a first buffer to receive an input signal and to generate a first buffer output signal;
- a second buffer to receive the first buffer output signal and to generate a second buffer output signal;
- a first ADC component to generate a first digital signal based on the first buffer output signal;
- a second ADC component to generate a second digital signal based on a difference of the second buffer output signal and the first output buffer signal;
- and
- a signal processing circuit to generate a corrected digital output signal based on the first digital signal and the second digital signal.
A analog-to-digital converter (ADC) apparatus with disturbance reduction, the ADC apparatus comprising:
- a first buffer to receive an input signal and to generate a first buffer output signal;
- a first ADC component to receive the first buffer output signal and to generate a first digital signal;
- a digital-to-analog converter (DAC) component to generate a converted first buffer output signal based on the first digital signal;
- a second buffer to receive the converted first buffer output signal and to generate a second buffer output signal;
- a second ADC component to generate a second digital signal based on a difference of the second buffer output signal and the first output buffer signal;
- and
- a signal processing circuit to generate a corrected digital output signal based on the first digital signal and the second digital signal.
A subranging analog-to-digital converter (ADC) system comprising:
- a first buffer to receive an input signal and to generate a first buffer output signal, wherein the first buffer introduces a first error component;
- a second buffer to generate a second buffer output signal, wherein the second buffer introduces a second error component;
- a first ADC component to generate a coarse estimate of the input signal;
- a second ADC component to generate a digital signal based on a difference of the second buffer output signal and the first output buffer signal;
- and
- a signal processing circuit to subtract the second error component from the first error component to generate a corrected digital output signal based on the digital signal and the coarse estimate.
Dependencies are inferred from the claim text.