METHOD AND DEVICE FOR FILTER-FREE FREQUENCY CONVERSION Russian patent published in 2011 - IPC H02M5/16 

FIELD: radio engineering.

SUBSTANCE: by means of 4 similar balance (double balance) mixers there formed in parallel are 4 products of quadratures of input and heterodyne signals: (cos_inp·cos_het); (sin_inp·sin_het); (sin_inp·cos_het); (cos_inp·sin_het). Both input signal and heterodyne signal is pre-split into quadrature components - cosine (advanced) and sine (retarded); each component of input signal is multiplied by each component of heterodyne and in compliance with trigonometry formulae for cosine and sine of sum and difference of two angles thee formed are cosine and sine quadrature signal components of intermediate frequency. Essence of the device consists in the fact that phase splitters of input signal and heterodyne signal into quadrature projections, cosine and sine ones, are introduced to it; four multipliers - balance mixers are used as mixer, which are loaded onto the first (R_H1) and the second (R_H2) load resistors and connections between them.

EFFECT: improving interference immunity and simplifying frequency division of GLONASS signals.

2 cl, 3 dwg