Digital module RF section

Details Digital module RF section Digital module RF section

1998-08-17

2000-10-17

Hunter, Daniel S.

Telecommunications

Receiver or analog modulated signal frequency converter

455130, 455131, 455339, 375316, 375318, H04B 126, H04B 116, H03K 900, H04L 2506

Patent

active

061344257

ABSTRACT:
A miniature RF receiver in the UHF frequency band. This receiver design is specific to the implementation of a digital module, as it contains no downconversion elements, and provides the capability of defining the operational frequency with cascaded tunable filter stages. The tunable filters are combline filters with tuning varactor diodes terminating each printed resonator. The 1 dB bandwidth of the filter is 7 Mhz, and for resonator length of 31 degrees (at the center frequency), the filter bandwidth remains nearly constant across the tunable frequency range. The capacitance of a varactor diode is a function of applied voltage. By controlling the voltage to each varactor, the filter response can be tuned across the operational frequency range of 50 Mhz.

REFERENCES:
patent: 4893316 (1990-01-01), Janc et al.
patent: 5375146 (1994-12-01), Chalmers

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