FREQUENCY CONVERTER Russian patent published in 2006 - IPC H03D7/14 

FIELD: radio engineering and measurement technology; frequency conversion in transceiving equipment.

SUBSTANCE: proposed frequency converter that incorporates provision for input-signal frequency conversion at double frequency of heterodyne signal and at conversion coefficient higher than unity has resonance-tuned amplifier stage with local negative feedback placed around its split load, its percentage being dependent on differential resistance of field-effect transistors connected in parallel in passive mode; transistor gates are controlled in phase opposition causing variations in feedback resistance twice within heterodyne signal period. High degree of isolation between input-signal and heterodyne-signal voltage circuits is afforded due to mutual compensation for antiphase currents at heterodyne signal frequency in load of bridge circuit formed by gate-drain stray capacitors of MOS field-effect transistors and paraphase balancing transformer windings, as well as due to low gate-drain transfer capacitance of second and third field-effect transistors.

EFFECT: enhanced isolation between input-signal and heterodyne-signal circuits.

1 cl, 1 dwg