Two state phase modulator with minimum amplitude modulation

Details Two state phase modulator with minimum amplitude modulation Two state phase modulator with minimum amplitude modulation

H - Electricity

03

C

H03C 3/04 (2006.01) G01S 13/28 (2006.01) H03C 3/00 (2006.01)

Patent

CA 2048763

TWO STATE PHASE MODULATOR WITH MINIMUM AMPLITUDE MODULATION ABSTRACT OF THE DISCLOSURE The invention relates to a two state phase modulator with minimum amplitude modulation. The modulator assumes two phase states differing by .THETA. where .THETA. is a sub-multiple of 180° which permits a phase variation of 180° for phase coded transmissions when the frequency of the phase modulated carrier wave is multiplied by the reciprocal of the sub-multiple. Three equal components are derived in the phase modula- tor: an in-phase, an out of phase, and a quadrature phase component. The out of phase component is delayed in relation to the in-phase component by .THETA./2, while the quadrature phase component is delayed .THETA./4. The in- phase and out of phase components are then reduced by a factor (2 sin .THETA./2) selected such that when added to the quadrature component, the resultants have a magnitude equal to that of the quadrature component and differ in phase from the quadrature component by ?.THETA./2. The modulator output is formed of the resultants supplied in alternation with the quadrature component at zero phase being supplied during the transitions. Amplitude variation during the phase modulation process is reduced to a fraction of a decibel.

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