RF-input circuit arrangement for a television tuner

Details RF-input circuit arrangement for a television tuner RF-input circuit arrangement for a television tuner

1986-03-11

1988-07-05

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 47, 334 56, 455339, H04B 116, H03J 524

Patent

active

047560240

ABSTRACT:
A circuit arrangement of input stages for a television tuner for the UHF, VHF and hyperband frequency bands in a continuous frequency range having primary bandpass filters for the UHF and VHF bands arranged in parallel, and connected to a signal input aerial (7). The input of the VHF primary bandpass filter is coupled to at least one grounded first inductance (27), series-arranged second and third inductances (29 and 31) between the output and the first inductance (27) and a grounded variable capacitor (33) arranged at the output and a first switch (35) which shunts the second inductance (29) and switches between the BI and the BIII ranges of the VHF band. A hyperband primary bandpass filter is integrated in the VHF primary bandpass filter, having a fourth inductance (53) coupled via a second switch (55) to the output (34) and to the input connection of the first inductance (27), and fifth inductance (51) which is connected to ground from the junction between the fourth inductance (53) and the second switch (55). For hyperband operation the second switch (55) is closed and the first switch (35) is open.

REFERENCES:
patent: 4379269 (1983-04-01), Ijichi
patent: 4555808 (1985-11-01), Fujimoto
patent: 4577171 (1986-03-01), Heigle et al.
patent: 4607391 (1986-08-01), Matsuda

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