Flash analog-to-digital converter

Details Flash analog-to-digital converter Flash analog-to-digital converter

1987-07-20

1988-08-09

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 136

Patent

active

047631066

ABSTRACT:
This flash analog-to-digital converter (ADC) offers the fastest possible high resolution conversion as the quantization level of the input signal is determined in a straightforward structure, whereby no feedback exists. For instance, a 16-bit flash ADC employs approximately 555 rather than 65,535 comparators normally required. In another embodiment only approximately 150 comparators are required. One or two noninverting amplifiers are used.
In the preferred embodiment, the ADC input signal is applied to a resistor network coupled between the ADC input and a reference current source. A plurality of comparators is coupled to the resistor network for comparing comparison signals deriving therefrom against ground, and producing a first code. In response thereto, a multiplexer selects one of the comparison signals which is amplified and then converted in an ADC unit into a second code. The successively produced first and second codes are converted in an encoder into corresponding binary codes which are added in an adder for providing the output code of the ADC.

REFERENCES:
patent: 3932865 (1976-01-01), Sagara

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