METHODS AND APPARATUS FOR INCREASING ANGLE MODULATION INDEX Russian patent published in 2013 - IPC H03C3/38 

FIELD: radio engineering, communication.

SUBSTANCE: first method of increasing angle modulation index is meant for increasing modulation index values in output frequency-modulated signals at the first harmonic of carrier frequency and is characterised by that it includes generating quadrature oscillation with respect to carrier frequency oscillation, generating cosine and sine components of the modulating voltage, performing in-phase and quadrature multiplication of high-frequency and low-frequency and first linear summation of results of first multiplications, obtaining a first frequency-modulated oscillation with a given modulation index value, further generating quadrature oscillation with respect to the first frequency-modulated oscillation, performing second similar pairwise multiplication and second linear algebraic summation of results of second multiplications.

EFFECT: generating virtually undistorted phase-modulated signals without limitation of modulation index values at the first, second, third and subsequent oscillation harmonics of carrier frequency.

8 cl, 25 dwg