Inventors:
Gilberto J. Hernandez - Miami FL
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H03H 701
Abstract:
A tunable filter (400) provides dual injection mode operation over a continuously tunable frequency range (500). A combination of mirrored series resonant circuits (432, 446) tuned through varactors (434, 448) allows the frequency response to shift. The use of a series capacitor and shunted inductor (430, 428), (444, 442) mirrored onto each series resonator (432, 446) provides both high-side and low-side injection protection.