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:
Mar. 15, 1994
Filed:
Apr. 13, 1992
Roger A Levinson, San Francisco, CA (US);
John M Caruso, Fremont, CA (US);
Ali Tasdighi, San Jose, CA (US);
Micro Power Systems, Inc., San Jose, CA (US);
Abstract
A digital to analog converter employs an operational amplifier as an active summing device for summing a first analog voltage corresponding to most significant bits of a digital value and a second analog voltage corresponding to least significant bits of the digital value. In a multi-channel application, a single MSB DAC can be shared by all channels through first MUXs in each channel with each channel having an independent LSB DAC. Alternatively, a single LSB DAC can be shared by all channels through second MUXs in each channel. Gain of the voltage summing operational amplifier in each channel is determined by values of a resistor connecting the output of the LSB DAC to the inverting negative input of the operational amplifier and of a feedback resistor connecting the amplifier output to the inverting negative input.