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:
Jul. 11, 2000
Filed:
Sep. 03, 1998
Brian Baskin, Cupertino, CA (US);
Other;
Abstract
The present invention encompasses an amplifier system comprising: an input signal port for providing an input signal; a modulating signal source for providing a modulating signal; a first feed forward loop coupled to the input signal port and the modulating signal source, the first feed forward loop modulating the input signal with the modulating signal, amplifying a first modulated input signal, outputting a first amplified modulated signal including distortion signals, and outputting a first difference signal; a first synchronous detection circuit coupled to the first feed forward loop and the modulating signal source, the first synchronous detection circuit outputting a first control signal in response to the first difference signal and the modulating signal, wherein the first control signal controls modulation of the input signal by the modulating signal such that the first difference signal consists of only distortion signals; a second feed forward loop coupled to the first feed forward loop, the second feed forward loop modulating the first difference signal, amplifying a second modulated input signal, and outputting a second amplified modulated signal; a second synchronous detection circuit coupled to the second feed forward loop and the modulating signal source, the second synchronous detection circuit outputting a second control signal in response to a second difference signal which represents a difference between the first amplified modulated signal and the second amplified modulated signal, wherein the second control signal controls modulation of the first difference signal in order to cancel the distortion signals in the first amplified modulated signal by the second amplified modulated signal; and an output signal port coupled to the first feed forward loop and the second feed forward loop, the output signal port outputting an output signal that is a function of the first amplified modulated signal and the second amplified modulated signal.