Receiver apparatus
AssigneeHitachi, Ltd.
InventorsHiroshi Hatashita, Toshio Nagashima, Tomomi Matsumoto
Life of this patent
Estimating the term…
Abstract
A receiver apparatus having a mixer circuit, an oscillator circuit and a tuner circuit is provided with a trap circuit, interposed between the tuner circuit and the mixer circuit, for removing disturbing mutual modulation waves generated by receiving two or more RF signals. Further, the mixer circuit employs a double balanced mixer structure to offset two or more disturbing mutual modulation waves.
Claims4
A receiver apparatus having at least a tuner circuit, a mixer circuit, and an oscillator circuit in which the mixer circuit is connected to the tuner circuit at an input side in the receiver and the oscillator circuit;
- wherein a trap filter circuit for attenuating a mutual modulation wave or a higher harmonic wave generated by said tuner circuit which receives a plurality of bands is provided between said mixer circuit and said tuner circuit and disposed in a stage prior to said mixer circuit;
- wherein said mixer circuit comprises means for offsetting a first spurious signal generated by converting two or more received RF signals to an IF band by said mixer circuit with a second spurious signal generated by converting mutual modulation waves generated by mutually modulating said two or more received RF signals by said tuner circuit to the IF band by said mixer circuit.
Dependencies are inferred from the claim text.