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. 09, 1988
Filed:
Dec. 15, 1986
Karl-Heinz Matthies, Hamburg, DE;
Gert F Bierkarre, Escheburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
The invention relates to a modulator comprising a first differential amplifier (6) which receives an input signal and a correction signal for adjusting the quiescent currents on the first and second output. The first differential amplifier (6) is coupled to a second differential amplifier (19) and a third differential amplifier (22), which receive the carrier signal and which supply the modulated signal. A difference signal proportional to the difference between the current of the first output and the current of the second output of the first differential amplifier (40) is applied to a low-pass filter (25), whose output signal is applied to a control amplifier (40). The control amplifier (40) supplies the correction signal to the second input of the first differential amplifier (6) via a storage device (50).