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:
Jun. 22, 2004
Filed:
Feb. 11, 2000
Matthias Reinhardt, Winnenden, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
A portable radio transmitter, especially a remote for a motor vehicle, has a voltage generator for generating an alternating voltage signal, a power-regulatable amplifier stage for amplifying the alternating voltage signal, and a power-regulating circuit with an operational amplifier. One input of the operational amplifier is supplied with a power setting voltage and other input is supplied through a rectifier stage with a feedback voltage signal. A transmitting antenna is supplied by the amplified alternating-voltage signal. The voltage signal generator includes an oscillator and the amplifier stage contains at least one bipolar transistor with its base connected to the oscillator, in whose collector-emitter current path a current adjustment element, controlled by the operational output, is wired. The rectifier stage includes a pair of diodes connected in parallel and in opposite directions and a capacitor and a resistor that are connected in parallel with one of the diodes.