US Patent 7310505 Attenuation control for tuners

Patent 7310505 was granted and assigned to Zenith Electronics on December, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Zenith Electronics

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

73105050

Patent Inventor Names

Pierre Dobrovolny0

Date of Patent

December 18, 2007

Patent Application Number

106584780

Date Filed

September 9, 2003

Patent Primary Examiner

‌

Pablo N Tran

Patent abstract

A tuner includes an RF input with a signal level controller such as an attenuator that is provided to attenuate a signal from the RF input. A tunable RF filter provides RF band limiting and determines simultaneously the AGC bandwidth. An amplifier with resistive feedback provides first and second outputs which, together, represent the incident power of the attenuated signal delivered by the amplifier, thus eliminating the need for a directional coupler and rendering this part of the tuner compatible with integration. A feedback circuit responds to the incident power of the attenuated signal by controlling the attenuation (AGC) provided by the signal level controller.