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:
Oct. 14, 1997
Filed:
Mar. 31, 1995
Leonid Strakovsky, Rumson, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A circuit for maintaining the magnitude of a radio frequency (RF) signal at least one predetermined level employs a detection circuit coupled to an RF signal generator by a four port coupling device. In one embodiment of the present invention, an impedance inverter in series with a diode is connected between the load termination of the coupling device and ground. The series combination of the impedance inverter and diode approximates a short circuit as the output signal power approaches a predetermined low amplitude threshold and approximates an open circuit as the output signal power approaches a predetermined upper amplitude threshold so that gain is provided to signals received by the detection circuit below a first amplitude level and attenuation is provided to signals received by the detection circuit above a second amplitude level. The transmit level detection circuit of the present invention requires substantially less power than conventional circuits, so that only 1%-2% or less of the output of the amplifier need be diverted for reliable operation, even for RF output power levels on the order of a fraction of a milliwatt.