Analog-to-digital converter employing multiple parallel switchin

Details Analog-to-digital converter employing multiple parallel switchin Analog-to-digital converter employing multiple parallel switchin

1992-12-08

1994-03-29

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341141, 341122, H03M 160, H03M 100

Patent

active

052989020

ABSTRACT:
A multi-channel analog-to-digital converter includes a counter (20) and a plurality of analog-to-digital conversion cells (10), each of which contain incremental discharge means (11-16) that store a charge proportional to the voltage value of an analog input signal and discharge that charge in increments upon the occurrence of the clock signal, also producing an active signal after the charge has been stored and before the incremental discharge is complete. A register (17) receives a count signal from the counter (20) and stores its value when the active signal goes inactive. A multiplexer (18) selects among the outputs of the plurality of analog-to-digital conversion cells (10) and supplies the selected output as a digital output signal. Linearizing means, such as a lookup ROM (30), receive the digital output signal and from it produce a digital value signal that is indicative of the voltage level of the analog input signal associated with the analog-to-digital conversion cell (10) currently selected by the multiplexer (18).

REFERENCES:
patent: 4353057 (1982-10-01), Bernet et al.
patent: 4398179 (1983-08-01), Kaneko
patent: 4598269 (1986-07-01), Penney
patent: 4663610 (1987-05-01), Metz et al.
patent: 4677422 (1987-06-01), Naito
patent: 4774498 (1988-09-01), Traa
patent: 4933676 (1990-06-01), Hauge et al.
patent: 5061926 (1991-10-01), Washiyama
patent: 5202686 (1993-04-01), Rapp et al.

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