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:
Jan. 05, 1993
Filed:
Feb. 14, 1992
Hiroshi Asazawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A radio frequency amplifier comprises a differential amplifier having a pair of differential first and second transistors and a first and a second load resistor; an emitter grounded amplifier having a third transistor and a third load resistor; and a reference voltage generator having a constant-current source formed by a fourth transistor and a fourth load resistor. The emitter grounded amplifier receives a high frequency input signal and outputs a single signal output. One input node of the differential amplifier receives the output from the emitter grounded amplifier and the other input node receives a reference voltage from the reference voltage generator. The third and fourth transistors form a current-mirror circuit. The DC bias voltages of the two input nodes of the differential amplifier are set to have the same value by an appropriate selection of the ratio between the currents flowing in the third and fourth transistors and also the ratio between the resistance values of the third and fourth load resistors. This arrangement enables to divide a high frequency input signal into a single signal output and differential signal outputs.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile