WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

H03C　MODULATION (measuring, testing G01R; masers, lasers H01S; modulators specially adapted for use in the amplifiers H03F 3/38; modulating pulses H03K 7/00; so-called modulators capable only of a switching between predetermined states of amplitude, frequency or phase H03K 17/00, H04L; coding, decoding or code conversion, in general H03M; synchronous modulators specially adapted for colour television H04N 9/65)

H03C 1/00 Amplitude modulation (H03C 5/00, H03C 7/00 take precedence)

H03C 1/02 ・Details

H03C 1/04 ・・Means in or combined with modulating stage for reducing angle modulation

H03C 1/06 ・・Modification of modulator to reduce distorsion, e.g. by feedback, and clearly applicable to more than one type of modulator

H03C 1/08 ・by means of variable impedance element (H03C 1/28 to H03C 1/34, H03C 1/46 to H03C 1/52, H03C 1/62 take precedence)

H03C 1/10 ・・the element being a current-dependent inductor

H03C 1/12 ・・the element being a voltage-dependent capacitor

H03C 1/14 ・・the element being a diode

H03C 1/16 ・by means of discharge device having at least three electrodes (H03C 1/28 to H03C 1/34, H03C 1/50, H03C 1/52, H03C 1/62 take precedence)

H03C 1/18 ・・carrier applied to control grid

H03C 1/20 ・・・modulating signal applied to anode

H03C 1/22 ・・・modulating signal applied to same grid

H03C 1/24 ・・・modulating signal applied to different grid

H03C 1/26 ・・・modulating signal applied to cathode

H03C 1/28 ・by means of transit-time tube

H03C 1/30 ・・by means of a magnetron

H03C 1/32 ・by deflection of electron beam in discharge tube

H03C 1/34 ・by means of light-sensitive element

H03C 1/36 ・by means of semiconductor device having at least three electrodes (H03C 1/34, H03C 1/50, H03C 1/52, H03C 1/62 take precedence)

H03C 1/46 ・Modulators with mechanically or acoustically driven parts

H03C 1/48 ・by means of Hall-effect devices

H03C 1/50 ・by converting angle modulation to amplitude modulation (H03C 1/28 to H03C 1/34, H03C 1/46, H03C 1/48 take precedence)

H03C 1/52 ・Modulators in which carrier or one side-band are wholly or partially suppressed (H03C 1/28 to H03C 1/34, H03C 1/46, H03C 1/48 take precedence)

H03C 1/54 ・・Balanced modulators, e.g. bridge type, ring type, double balanced type

H03C 1/542 ・・・{comprising semiconductor devices with at least three electrodes}

H03C 1/545 ・・・・{using bipolar transistors}

H03C 1/547 ・・・・{using field-effect transistors}

H03C 1/56 ・・・comprising variable two-pole elements only

H03C 1/58 ・・・・comprising diodes

H03C 1/60 ・・with one sideband wholly or partially suppressed

H03C 1/62 ・Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present (H03C 1/28 to H03C 1/34, H03C 1/46, H03C 1/48 take precedence)

H03C 3/00 Angle modulation (H03C 5/00, H03C 7/00 take precedence)

H03C 3/005 ・{Circuits for asymmetric modulation}

H03C 3/02 ・Details

H03C 3/04 ・・Means in or combined with modulating stage for reducing amplitude modulation

H03C 3/06 ・・Means for changing frequency deviation {for demodulation H03D 3/003, H03D 3/242}

H03C 3/08 ・・Modification of modulator to linearise modulation, e.g. by feedback, and clearly applicable to more than one type of modulator

H03C 3/09 ・・Modifications of modulator for regulating the mean frequency

H03C 3/0908 ・・・{using a phase locked loop}

H03C 3/0916 ・・・・{with frequency divider or counter in the loop}

H03C 3/0925 ・・・・・{applying frequency modulation at the divider in the feedback loop}

H03C 3/0933 ・・・・・{using fractional frequency division in the feedback loop of the phase locked loop}

H03C 3/0941 ・・・・{applying frequency modulation at more than one point in the loop}

H03C 3/095 ・・・・{applying frequency modulation to the loop in front of the voltage controlled oscillator}

H03C 3/0958 ・・・・{applying frequency modulation by varying the characteristics of the voltage controlled oscillator}

H03C 3/0966 ・・・・{modulating the reference clock}

H03C 3/0975 ・・・・{applying frequency modulation in the phase locked loop at components other than the divider, the voltage controlled oscillator or the reference clock}

H03C 3/0983 ・・・・{containing in the loop a mixer other than for phase detection}

H03C 3/0991 ・・・・{including calibration means or calibration methods}

H03C 3/10 ・by means of variable impedance (H03C 3/30 to H03C 3/38 take precedence)

H03C 3/12 ・・by means of a variable reactive element

H03C 3/14 ・・・simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit

H03C 3/145 ・・・・{by using semiconductor elements}

H03C 3/16 ・・・・in which the active element simultaneously serves as the active element of an oscillator

H03C 3/18 ・・・the element being a current-dependent inductor

H03C 3/20 ・・・the element being a voltage-dependent capacitor

H03C 3/22 ・・・the element being a semiconductor diode, e.g. varicap diode

H03C 3/222 ・・・・{using bipolar transistors (H03C 3/227 takes precedence)}

H03C 3/225 ・・・・{using field effect transistors (H03C 3/227 takes precedence)}

H03C 3/227 ・・・・{using a combination of bipolar transistors and field effect transistors}

H03C 3/24 ・・by means of a variable resistive element, e.g. tube

H03C 3/245 ・・・{by using semiconductor elements}

H03C 3/26 ・・・comprising two elements controlled in push-pull by modulating signal

H03C 3/28 ・・using variable impedance driven mechanically or acoustically

H03C 3/30 ・by means of transit-time tube

H03C 3/32 ・・the tube being a magnetron

H03C 3/34 ・by deflection of electron beam in discharge tube

H03C 3/36 ・by means of light-sensitive element

H03C 3/38 ・by converting amplitude modulation to angle modulation

H03C 3/40 ・・using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated

H03C 3/403 ・・・{using two quadrature frequency conversion stages in cascade}

H03C 3/406 ・・・{using a feedback loop containing mixers or demodulators}

H03C 3/42 ・by means of electromechanical devices (H03C 3/28 takes precedence)

H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal (H03C 7/00 takes precedence)

H03C 5/02 ・by means of transit-time tube

H03C 5/04 ・・the tube being a magnetron

H03C 5/06 ・by deflection of electron beam in discharge tube

H03C 7/00 Modulating electromagnetic waves (modulating light G02F 1/00; for generating oscillations H03B, H03K)

H03C 7/02 ・in transmission line, waveguide, cavity resonator, or radiation field of aerial

H03C 7/022 ・・{using ferromagnetic devices, e.g. ferrites}

H03C 7/025 ・・{using semiconductor devices}

H03C 7/027 ・・・{using diodes}

H03C 7/04 ・・Polarisation of transmitted wave being modulated {H03C 7/022 takes precedence}

H03C 99/00 Subject matter not provided for in other groups of this subclass

H03C 2200/00 Indexing scheme relating to details of modulators or modulation methods covered by H03C

H03C 2200/0004 ・Circuit elements of modulators

H03C 2200/0008 ・・Variable capacitors, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor

H03C 2200/0012 ・・Emitter or source coupled transistor pairs or long tail pairs

H03C 2200/0016 ・・Pre-emphasis or de-emphasis circuits

H03C 2200/002 ・・Filters with particular characteristics

H03C 2200/0025 ・・Gilbert multipliers

H03C 2200/0029 ・・Memory circuits, e.g. ROMs, RAMs, EPROMs, latches, shift registers

H03C 2200/0033 ・・Transmission lines, e.g. striplines, microstrips or coplanar lines

H03C 2200/0037 ・Functional aspects of modulators

H03C 2200/0041 ・・Calibration of modulators

H03C 2200/0045 ・・Pulse width, duty cycle or on/off ratio

H03C 2200/005 ・・Modulation sensitivity

H03C 2200/0054 ・・・Filtering of the input modulating signal for obtaining a constant sensitivity of frequency modulation

H03C 2200/0058 ・・Quadrature arrangements

H03C 2200/0062 ・・Lowering the supply voltage and saving power

H03C 2200/0066 ・・Reduction of carrier leakage or the suppression of the carrier

H03C 2200/007 ・・with one sideband wholly or partially suppressed

H03C 2200/0075 ・・FM modulation down to DC

H03C 2200/0079 ・・Measures to linearise modulation or reduce distortion of modulation characteristics

H03C 2200/0083 ・・・Predistortion of input modulating signal to obtain a linear modulation characteristic

H03C 2200/0087 ・・Measures to address temperature induced variations of modulation

H03C 2200/0091 ・・・by stabilising the temperature

H03C 2200/0095 ・・・by compensating temperature induced variations