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:
Mar. 31, 1992
Filed:
Sep. 18, 1989
Jae-Ik Jung, Daegu-city, KR;
SamSung Electronics Co., Ltd., Kyung Ki-Do, KR;
Abstract
Disclosed is a circuit being capable of controlling RF-power levels without application of an additional controller to a booster module when trying to utilizing an hand-held radio telephone as a mobile radiophone for use in a vehicle. The circuit selects a correct level of RF-power output suitably corresponding to a desired mode of the mobile radiophone, in accordance with generating a plurality of bits of logic control signal. The circuit comprises a first voltage source of logic high level, second voltage source of logic low level, a switching circuit for selectively outputting the first or second voltage source through each bit of output port switched according to the first or second logic control signal, and apparatus for producing the radio-frequency power control voltage to control said radio-frequency power, by combination of resistors each having a given value according to the first and second voltage sources.