Accession Number : ADD001767
Title : Amplitude Modulator Having a Transistor Controlled Bias Current.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Lisle,Thomas K , Jr ; Romanchak,Joseph
Report Date : 11 Feb 1975
Pagination or Media Count : 4
Abstract : The patent describes an amplitude modulator capable of 100% modulation with low modulation distortion, adaptable to all practical amplitude modulation requirements from D.C. to 120 MHz. The circuit has a differential amplifier with an R.F. input and a bias current from an ultra-linear, voltage-tuned constant current source which is transistor controlled. The differential amplifier provides full limiting of the R.F. input and is biased with a current source comprised of an operational amplifier with its feedback connected to include the bias current controlling transistor.
Descriptors : *Modulators, *Patents, Amplitude modulation, Transistors, Current regulators, Operational amplifiers, Limiters
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE