Multistep flash analog to digital converter with voltage estimat

Details Multistep flash analog to digital converter with voltage estimat Multistep flash analog to digital converter with voltage estimat

1989-02-13

1990-04-17

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, H03M 136

Patent

active

049184490

ABSTRACT:
A novel multistep flash analog to digital converter is taught, including a voltage estimator which quickly provides a rough estimate of the analog input signal. This rough estimate is used to select appropriate reference voltage tap points for use in the first flash conversion. This first flash conversion, together with the voltage estimate, provides the most significant bits of the digital output word. A digital to analog converter is used to provide a residual voltage which is then converted by a second operation of the flash converter, thereby providing the least significant bits of the digital output word. In one embodiment, the voltage estimate is performed at the same time that the analog input signal is sampled by the flash converter in preparation for the first flash conversion. Therefore, speed of operation is not degraded by the addition of the voltage estimator.

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