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:
Feb. 17, 2009
Filed:
Apr. 30, 2007
Kenneth D. Poulton, Palo Alto, CA (US);
Kenneth D. Poulton, Palo Alto, CA (US);
Agilent Technologies, Inc., Santa Clara, CA (US);
Abstract
In an analog-to-digital converter, an analog-to-digital conversion stage comprising a comparator and an analog residual signal generator. The comparator is operable to compare an analog input signal or a sample of the analog input signal with a threshold to generate a bit signal. The analog residual signal generator is operable to generate an analog residual signal from signals comprising the sample of the analog input signal and the bit signal such that, at a level of the analog input signal equal to the threshold of the comparator, the analog residual signal has a level independent of the state of the bit signal. The analog residual signal generator comprises a summing element, a selective inverter and an amplifier in series. The summing element is operable to sum a signal input to it with a reference signal. The selective inverter precedes the summing element, and is operable in response to a first state of the bit signal to pass a signal input to it, and is operable in response to a second state of the bit signal to invert the signal input to it.