The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 1980
Filed:
Jul. 26, 1978
Robert L Carbrey, Boulder, CO (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
The disclosed analog to digital converter employs a single signal propagation path thereby necessitating only one holding capacitor (101) per stage (STAGE 1) of coding. The first terminal (B) of each holding capacitor (101) is connected to a reference voltage (L1) such as a resistive divider (106, 116, 126, 136, 146, 150, 151, V.sub.HI) which has binary weighted taps (L1-L5). The other terminal (A) of each holding capacitor (101) is connected to the analog signal input (INPUT). The reference voltage (L1) and the analog sample (V1) are compared and, for a zero decision, the stored analog sample (V1) is directly passed on to the subsequent stage (STAGE 2) by a buffer circuit (102). For a one decision, the aforementioned first terminal (B) of the holding capacitor (101) is switched from the tap of the resistive divider to circuit ground thereby subtracting that binary weight (L1) from the signal (V1) stored on the holding capacitor (101). When the subtraction operation is complete, the remaining signal (V1-L1) is passed through the buffer circuit (102) to the subsequent stage (STAGE 2).