Radio frequency tuner

Details Radio frequency tuner Radio frequency tuner

2006-01-17

2009-10-27

Le, Thanh C (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S318000

Reexamination Certificate

active

07610033

ABSTRACT:
A radio frequency tuner is provided having inputs for receiving signals in common or overlapping frequency ranges from distribution networks. Each input is connected to a respective first converter, for example performing upconversion to a first intermediate frequency above the RF frequency ranges of the incoming signals. The first frequency changers are arranged to be active one at a time. The outputs of the first frequency changers are supplied to a second frequency changer which performs downconversion on the output signal of the active first converter to convert a selected channel from one of the distribution networks to a second intermediate frequency. Sufficient RF isolation may therefore be provided without requiring mechanical switching components such as RF relays.

REFERENCES:
patent: 5280639 (1994-01-01), Kubo
patent: 7027833 (2006-04-01), Goodman
patent: 2284115 (1995-05-01), None
British Search Report for Application No. GB0500825.5, dated Feb. 28, 2005.

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