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. 14, 1989
Filed:
Feb. 01, 1988
James Woo, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
An f.sub.T quadrupler amplifier improves the frequency response beyond that which is possible with an f.sub.T doubler, yet retains precise nonlinearity correction. Voltage to current conversion is achieved by two parallel differential transconductance signal amplifiers. Two of the inputs of the signal amplifiers are coupled together to form one main differential input, whereas the other two inputs are coupled together and to ground or to a reference voltage. The outputs of the signal amplifiers are cross coupled to form a main differential current output. A parallel differential transconductance error amplifier is provided which senses an error voltage generated by the main signal amplifiers. A corresponding error correction current is generated by the parallel error amplifier and returned to the parallel signal amplifiers. This error correction current substantially reduces nonlinearities in the output current of the signal amplifiers.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile