H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/27
H04N 7/16 (2006.01) H03D 7/16 (2006.01) H03B 5/12 (2006.01) H03D 7/12 (2006.01) H03D 7/14 (2006.01)
Patent
CA 1174353
Abstract A cable television up-down tuner includes a first frequency up conversion stage in which a first local oscillator, tunable over a wide frequency range, is coupled to a ring diode mixer having individual biasing networks in series with each diode. A combination high pass and low pass filter provides a bandwidth coupling of input signals to the mixer. An intermediate frequency amplifier couples the up converted signal to a second mixes. A fixed tuned second local oscillator down con- verts the intermediate frequency signal to a selected television channel frequency. The first local oscillator includes a printed circuit board transmission line resonator which is tuned by a varactor diode. The two local oscillators are positioned adjacent the corners of a quadrilateral housing and are isolated from each other by three wall-type shields.
398638
Mantha Ramesh
Marks & Clerk
LandOfFree
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