Angle modulation

HELECTRICITY H03Electronic circuits H03CMODULATION

H03C3/00Angle modulation

H03C3/005Circuits for asymmetric modulation H03C3/02Details H03C3/04Means in or combined with modulating stage for reducing amplitude modulation H03C3/06Means for changing frequency deviation H03C3/08Modification of modulator to linearise modulation H03C3/09Modifications of modulator for regulating the mean frequency H03C3/0908using a phase locked loop H03C3/0916with frequency divider or counter in the loop H03C3/0925applying frequency modulation at the divider in the feedback loop H03C3/0933using fractional frequency division in the feedback loop of the phase locked loop H03C3/0941applying frequency modulation at more than one point in the loop H03C3/095applying frequency modulation to the loop in front of the voltage controlled oscillator H03C3/0958applying frequency modulation by varying the characteristics of the voltage controlled oscillator H03C3/0966modulating the reference clock H03C3/0975applying frequency modulation in the phase locked loop at components other than the divider, the voltage controlled oscillator or the reference clock H03C3/0983containing in the loop a mixer other than for phase detection H03C3/0991including calibration means or calibration methods H03C3/10by means of variable impedance H03C3/12by means of a variable reactive element H03C3/14simulated by circuit comprising active element with at least three electrodes H03C3/145by using semiconductor elements H03C3/16in which the active element simultaneously serves as the active element of an oscillator H03C3/18the element being a current-dependent inductor H03C3/20the element being a voltage-dependent capacitor H03C3/22the element being a semiconductor diode H03C3/222using bipolar transistors H03C3/225using field effect transistors H03C3/227using a combination of bipolar transistors and field effect transistors H03C3/24by means of a variable resistive element H03C3/245by using semiconductor elements H03C3/26comprising two elements controlled in push-pull by modulating signal H03C3/28using variable impedance driven mechanically or acoustically H03C3/30by means of transit-time tube H03C3/32the tube being a magnetron H03C3/34by deflection of electron beam in discharge tube H03C3/36by means of light-sensitive element H03C3/38by converting amplitude modulation to angle modulation H03C3/40using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated H03C3/403using two quadrature frequency conversion stages in cascade H03C3/406using a feedback loop containing mixers or demodulators H03C3/42by means of electromechanical devices