Version: 2024.08
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CPC | COOPERATIVE PATENT CLASSIFICATION | ||||||
| H03C | NOTES
WARNING
|
H03C 1/00 |
H03C 1/02 | . | Details [2013-01] |
H03C 1/04 | . . | Means in or combined with modulating stage for reducing angle modulation [2013-01] |
H03C 1/06 | . . | Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator [2017-08] |
H03C 1/08 | . |
H03C 1/10 | . . | the element being a current-dependent inductor [2013-01] |
H03C 1/12 | . . | the element being a voltage-dependent capacitor [2013-01] |
H03C 1/14 | . . | the element being a diode [2013-01] |
H03C 1/16 | . |
H03C 1/18 | . . | carrier applied to control grid [2013-01] |
H03C 1/20 | . . . | modulating signal applied to anode [2013-01] |
H03C 1/22 | . . . | modulating signal applied to same grid [2013-01] |
H03C 1/24 | . . . | modulating signal applied to different grid [2013-01] |
H03C 1/26 | . . . | modulating signal applied to cathode [2013-01] |
H03C 1/28 | . | by means of transit-time tube [2013-01] |
H03C 1/30 | . . | by means of a magnetron [2013-01] |
H03C 1/32 | . | by deflection of electron beam in discharge tube [2013-01] |
H03C 1/34 | . | by means of light-sensitive element [2013-01] |
H03C 1/36 | . |
H03C 1/46 | . | Modulators with mechanically-driven or acoustically-driven parts [2022-05] |
H03C 1/48 | . | by means of Hall-effect devices [2013-01] |
H03C 1/50 | . |
H03C 1/52 | . |
H03C 1/54 | . . | Balanced modulators, e.g. bridge type, ring type or double balanced type [2022-05] |
H03C 1/542 | . . . | {comprising semiconductor devices with at least three electrodes} [2013-01] |
H03C 1/545 | . . . . | {using bipolar transistors} [2013-01] |
H03C 1/547 | . . . . | {using field-effect transistors} [2013-01] |
H03C 1/56 | . . . | comprising variable two-pole elements only [2013-01] |
H03C 1/58 | . . . . | comprising diodes [2013-01] |
H03C 1/60 | . . | with one sideband wholly or partially suppressed [2013-01] |
H03C 1/62 | . |
H03C 3/00 |
H03C 3/005 | . | {Circuits for asymmetric modulation} [2013-01] |
H03C 3/02 | . | Details [2013-01] |
H03C 3/04 | . . | Means in or combined with modulating stage for reducing amplitude modulation [2013-01] |
H03C 3/06 | . . | Means for changing frequency deviation [2022-05] |
H03C 3/08 | . . | Modifications of modulator to linearise modulation, e.g. by feedback, and clearly applicable to more than one type of modulator [2017-08] |
H03C 3/09 | . . | Modifications of modulator for regulating the mean frequency [2013-01] |
H03C 3/0908 | . . . | {using a phase locked loop} [2013-01] |
H03C 3/0916 | . . . . | {with frequency divider or counter in the loop} [2013-01] |
H03C 3/0925 | . . . . . | {applying frequency modulation at the divider in the feedback loop} [2013-01] |
H03C 3/0933 | . . . . . | {using fractional frequency division in the feedback loop of the phase locked loop} [2013-01] |
H03C 3/0941 | . . . . | {applying frequency modulation at more than one point in the loop} [2013-01] |
H03C 3/095 | . . . . | {applying frequency modulation to the loop in front of the voltage controlled oscillator} [2013-01] |
H03C 3/0958 | . . . . | {applying frequency modulation by varying the characteristics of the voltage controlled oscillator} [2013-01] |
H03C 3/0966 | . . . . | {modulating the reference clock} [2013-01] |
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} [2013-01] |
H03C 3/0983 | . . . . | {containing in the loop a mixer other than for phase detection} [2013-01] |
H03C 3/0991 | . . . . | {including calibration means or calibration methods} [2013-01] |
H03C 3/10 | . |
H03C 3/12 | . . | by means of a variable reactive element [2013-01] |
H03C 3/14 | . . . | simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit [2013-01] |
H03C 3/145 | . . . . | {by using semiconductor elements} [2013-01] |
H03C 3/16 | . . . . | in which the active element simultaneously serves as the active element of an oscillator [2013-01] |
H03C 3/18 | . . . | the element being a current-dependent inductor [2013-01] |
H03C 3/20 | . . . | the element being a voltage-dependent capacitor [2013-01] |
H03C 3/22 | . . . | the element being a semiconductor diode, e.g. varicap diode [2013-01] |
H03C 3/222 | . . . . | {using bipolar transistors (H03C 3/227 takes precedence)} [2013-01] |
H03C 3/225 | . . . . | {using field effect transistors (H03C 3/227 takes precedence)} [2013-01] |
H03C 3/227 | . . . . | {using a combination of bipolar transistors and field effect transistors} [2013-01] |
H03C 3/24 | . . | by means of a variable resistive element, e.g. tube [2013-01] |
H03C 3/245 | . . . | {by using semiconductor elements} [2013-01] |
H03C 3/26 | . . . | comprising two elements controlled in push-pull by modulating signal [2013-01] |
H03C 3/28 | . . | using variable impedance driven mechanically or acoustically [2013-01] |
H03C 3/30 | . | by means of transit-time tube [2013-01] |
H03C 3/32 | . . | the tube being a magnetron [2013-01] |
H03C 3/34 | . | by deflection of electron beam in discharge tube [2013-01] |
H03C 3/36 | . | by means of light-sensitive element [2013-01] |
H03C 3/38 | . | by converting amplitude modulation to angle modulation [2013-01] |
H03C 3/40 | . . | using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated [2013-01] |
H03C 3/42 | . |
H03C 5/00 | Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal (H03C 7/00 takes precedence) [2013-01] |
H03C 5/02 | . | by means of transit-time tube [2013-01] |
H03C 5/04 | . . | the tube being a magnetron [2013-01] |
H03C 5/06 | . | by deflection of electron beam in discharge tube [2013-01] |
H03C 7/00 | Modulating electromagnetic waves (devices or arrangements for the modulation of light G02F 1/00) [2022-05] |
H03C 7/02 | . | in transmission lines, waveguides, cavity resonators or radiation fields of antennas [2022-05] |
H03C 99/00 | Subject matter not provided for in other groups of this subclass [2013-01] |
H03C 2200/00 | Indexing scheme relating to details of modulators or modulation methods covered by H03C [2013-01] |
H03C 2200/0004 | . | Circuit elements of modulators [2013-01] |
H03C 2200/0008 | . . | Variable capacitors, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor [2013-01] |
H03C 2200/0012 | . . | Emitter or source coupled transistor pairs or long tail pairs [2013-01] |
H03C 2200/0016 | . . | Pre-emphasis or de-emphasis circuits [2013-01] |
H03C 2200/002 | . . | Filters with particular characteristics [2013-01] |
H03C 2200/0025 | . . | Gilbert multipliers [2013-01] |
H03C 2200/0029 | . . | Memory circuits, e.g. ROMs, RAMs, EPROMs, latches, shift registers [2013-01] |
H03C 2200/0033 | . . | Transmission lines, e.g. striplines, microstrips or coplanar lines [2013-01] |
H03C 2200/0037 | . | Functional aspects of modulators [2013-01] |
H03C 2200/0041 | . . | Calibration of modulators [2013-01] |
H03C 2200/0045 | . . | Pulse width, duty cycle or on/off ratio [2013-01] |
H03C 2200/005 | . . | Modulation sensitivity [2013-01] |
H03C 2200/0054 | . . . | Filtering of the input modulating signal for obtaining a constant sensitivity of frequency modulation [2013-01] |
H03C 2200/0058 | . . | Quadrature arrangements [2013-01] |
H03C 2200/0062 | . . | Lowering the supply voltage and saving power [2013-01] |
H03C 2200/0066 | . . | Reduction of carrier leakage or the suppression of the carrier [2013-01] |
H03C 2200/007 | . . | with one sideband wholly or partially suppressed [2013-01] |
H03C 2200/0075 | . . | FM modulation down to DC [2013-01] |
H03C 2200/0079 | . . | Measures to linearise modulation or reduce distortion of modulation characteristics [2013-01] |
H03C 2200/0083 | . . . | Predistortion of input modulating signal to obtain a linear modulation characteristic [2013-01] |
H03C 2200/0087 | . . | Measures to address temperature induced variations of modulation [2013-01] |
H03C 2200/0091 | . . . | by stabilising the temperature [2013-01] |
H03C 2200/0095 | . . . | by compensating temperature induced variations [2013-01] |