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:
May. 10, 2016
Filed:
Sep. 28, 2015
Nishant Dhawan, Santa Barbara, CA (US);
Kenton Veeder, Santa Barbara, CA (US);
Nishant Dhawan, Santa Barbara, CA (US);
Kenton Veeder, Santa Barbara, CA (US);
Senseeker Engineering Inc., Goleta, CA (US);
Abstract
Methods and Systems for calibrating a Single Ramp Multiple Slope Analog to Digital Converter (SRMS ADC), the ADC including a counter and a plurality N of charge and discharge elements of different time constant i.e. slope, wherein the relationships between slopes is defined as a function of the shallowest slope Ssuch that S=K·S, S=K·S, . . . S=K·Swhere the K values are integers, and the code count for conversion is C=K·C+K·C+ . . . K·C+Cwhere each Crepresents an observed counts per each slope for a conversion, including; sampling for a first calibration pass a voltage with the ADC, discharging the voltage on the steepest slope for a number of counter counts C, charging and discharging on the remaining slopes up to Kto Kfor a number of counts per slope, Ce.g. Cto C, discharging the remaining voltage residue on the shallowest slope and note the count, C, sampling the same voltage on the ADC for a second calibration pass, discharging the voltage on the steepest slope for a modified number of counter counts C=C+/−X, modifying the number of charge/discharge counts time Cfor the slopes Kto Kto adjust for the change expected from the modified steep slope discharge to reach the shallowest slope with the same expected residue as for the first calibration pass, discharging the remaining voltage residue on the shallowest slope and note the actual count, C, adjusting Kto Kbased on the difference between Cand C, and; using C=K·C+K·C+ . . . K·C+Cas the count code for conversion.