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:
Feb. 19, 2008
Filed:
Dec. 15, 2003
Scott Allan Woodford, Austin, TX (US);
Scott Allan Woodford, Austin, TX (US);
Silicon Laboratories, Austin, TX (US);
Abstract
A low-noise block (LNB) control device within a set-top box is disclosed. The LNB control device is capable of controlling modulation of an alternating waveform on a direct current (DC) voltage from a DC power supply to an LNB amplifier. The LNB control device includes a power supply control module, an LNB signaling module and a switch. In response to a power supply feedback signal received from the DC power supply, the power supply control module sends a control signal to the DC power supply. In addition, the LNB signalling module provides a switch control signal and a modulating waveform to the switch. Under the control of switch control signal, the switch selectively sends the modulating waveform to a summing circuit that is located external to the LNB control device. Within the summing circuit, the modulating waveform is added to the DC voltage from the DC power supply.