Television – Special applications – With endoscope
Patent
1994-08-08
1996-03-12
Kostak, Victor R.
Television
Special applications
With endoscope
334 11, 4551881, H03J 502
Patent
active
054990564
ABSTRACT:
A band switchable double tuned circuit having a balanced secondary is presented. A primary tunable tank circuit with a plurality of first inductances is tuned to a first frequency by a first capacitor coupled in parallel with the first inductances. A secondary tank circuit with a plurality of second inductances inductively coupled to ones of the first inductances has a second capacitor coupled in parallel with the second inductances for tuning the secondary to the first frequency. The DC reference potential for the secondary circuit is coupled to a nodal junction of the plurality of second inductances with the secondary tank circuit providing a balanced signal output. At least one of the plurality of first inductances and the second inductances are switchable for bandswitching the tuning of the primary and secondary tank circuits to a second frequency. The output signal from the balanced secondary is coupled to the input of a balanced mixer via constant bandwidth inductances without a mixer input balance transformer.
REFERENCES:
patent: 5020146 (1991-05-01), Pugel
patent: 5285179 (1994-07-01), Wignot et al.
Emanuel Peter M.
Flynn Nathan J.
Kostak Victor R.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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