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:
Aug. 07, 2001
Filed:
Mar. 02, 1999
John D. Speake, Cambridge, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
A gain controlled radio receiver for a selective call system, includes a multi-step gain controlled RF amplifier (,) coupled to receive an input signal and a measuring circuit (,) for measuring the level of a wanted frequency down converted signal. The multi-step gain controlled amplifier (,) has an input terminal (RIP, RIN), N gain stages (,A to,E), where N is an integer of at least 2, having outputs coupled to a common output stage (,). A first of the N gain stages (,A) is coupled to the input terminal (RIP, RIN), and an (N−1) stage capacitive ladder attenuator (,) has an input coupled to the input terminal and outputs coupled respectively to an input of each of the second to Nth gain stages (,B to,E). The measuring circuit (,) has a level control output (,) for switching-on a selected one of the gain stages which provides an amplified signal to the common output stage for frequency down conversion and demodulation.