Patent · US Expired

Controllable RF broadband and amplifier with a constant input impedance

US7286017B2 · kind B2 · utility

0Cited by

3References

16Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Heinrich Schemmann · Villingen-Schwenningen, DE
Mehmet Ipek · Villingen-Schwenningen, DE
Sabine Roth · Berlin, DE

Key dates

Filing date	Dec 5, 2003
Grant date	Oct 23, 2007
Priority date	—
Expiry date	Apr 11, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2203/7227
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A variable-gain RF amplifier arrangement whose input impedance is essentially independent of the selected gain is proposed, which has a large number of selectable elementary amplifiers, with an input signal being scaled and the input impedance being set to be the same by means of switchable current limiting elements upstream of the elementary amplifiers, which are associated with the elementary amplifiers. The circuit also has a low noise level, which is largely independent of the selected gain, and good linearity. A broadcast radio receiver as well as a receiver for receiving data signals using an amplifier according to the invention are also proposed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.