WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

H03D　DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K 9/00; transforming types of pulse modulation H03K 11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B 7/14; demodulators adapted for ac systems of digital information transmission H04L 27/00; synchronous demodulators adapted for colour television H04N 9/66)

H03D 1/00 Demodulation of amplitude-modulated oscillations (H03D 5/00, H03D 9/00, H03D 11/00 take precedence)

H03D 1/02 ・Details

H03D 1/04 ・・Modifications of demodulators to reduce interference by undesired signals

H03D 1/06 ・・Modifications of demodulators to reduce distortion, e.g. by negative feedback

H03D 1/08 ・by means of non-linear two-pole elements (H03D 1/22, H03D 1/26, H03D 1/28 take precedence)

H03D 1/10 ・・of diodes

H03D 1/12 ・・・with provision for equalising ac and dc loads

H03D 1/14 ・by means of non-linear elements having more than two poles (H03D 1/22, H03D 1/26, H03D 1/28 take precedence)

H03D 1/16 ・・of discharge tubes

H03D 1/18 ・・of semiconductor devices

H03D 1/20 ・・with provision for preventing undesired type of demodulation, e.g. preventing anode detection in a grid detection circuit

H03D 1/22 ・Homodyne or synchrodyne circuits {(receiver circuits H04B 1/30)}

H03D 1/2209 ・・{Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders}

H03D 1/2218 ・・・{using diodes for the decoding}

H03D 1/2227 ・・・{using switches for the decoding (diodes used as switches H03D 1/2218)}

H03D 1/2236 ・・・{using a phase locked loop}

H03D 1/2245 ・・{using two quadrature channels (H03D 1/2209 takes precedence)}

H03D 1/2254 ・・・{and a phase locked loop}

H03D 1/2272 ・・{using FET`s (H03D 1/2209, H03D 1/2245 and H03D 1/2281 take precedence)}

H03D 1/2281 ・・{using a phase locked loop (H03D 1/2236 and H03D 1/2254 take precedence)}

H03D 1/229 ・・{using at least a two emittor-coupled differential pair of transistors (H03D 1/2209 to H03D 1/2281 take precedence)}

H03D 1/24 ・・for demodulation of signals wherein one sideband or the carrier has been wholly or partially suppressed {(receiver circuits H04B 1/302)}

H03D 1/26 ・by means of transit-time tubes

H03D 1/28 ・by deflecting an electron beam in a discharge tube (H03D 1/26 takes precedence)

H03D 3/00 Demodulation of angle-, {frequency- or phase-} modulated oscillations (H03D 5/00, H03D 9/00, H03D 11/00 take precedence)

H03D 3/001 ・{Details of arrangements applicable to more than one type of frequency demodulator (H03D 3/28 takes precedence)}

H03D 3/002 ・・{Modifications of demodulators to reduce interference by undesired signals (H03D 3/248 takes precedence)}

H03D 3/003 ・・{Arrangements for reducing frequency deviation, e.g. by negative frequency feedback (combined with a phase locked loop demodulator H03D 3/242; changing frequency deviation for modulators H03C 3/06)}

H03D 3/004 ・・・{wherein the demodulated signal is used for controlling an oscillator, e.g. the local oscillator}

H03D 3/005 ・・・{wherein the demodulated signal is used for controlling a bandpass filter (automatic bandwidth control H03G; automatic frequency control H03J 7/02)}

H03D 3/006 ・{by sampling the oscillations and further processing the samples, e.g. by computing techniques (H03D 3/007 takes precedence)}

H03D 3/007 ・{by converting the oscillations into two quadrature related signals (H03D 3/245 takes precedence)}

H03D 3/008 ・・{Compensating DC offsets}

H03D 3/009 ・・{Compensating quadrature phase or amplitude imbalances}

H03D 3/02 ・by detecting phase difference between two signals obtained from input signal (H03D 3/28 to H03D 3/32 take precedence; {muting in frequency-modulation receivers H03G 3/28}; limiting arrangements H03G 11/00)

H03D 3/04 ・・by counting or integrating cycles of oscillations {arrangements for measuring frequencies G01R 23/10}

H03D 3/06 ・・by combining signals additively or in product demodulators

H03D 3/08 ・・・by means of diodes, e.g. Foster-Seeley discriminator

H03D 3/10 ・・・・in which the diodes are simultaneously conducting during the same half period of the signal, e.g. radio detector

H03D 3/12 ・・・by means of discharge tubes having more than two electrodes

H03D 3/14 ・・・by means of semiconductor devices having more than two electrodes

H03D 3/16 ・・・by means of electromechanical resonators

H03D 3/18 ・・by means of synchronous gating arrangements

H03D 3/20 ・・・producing pulses whose amplitude or duration depends on phase difference

H03D 3/22 ・・by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector

H03D 3/24 ・・Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits

H03D 3/241 ・・・{the oscillator being part of a phase locked loop}

H03D 3/242 ・・・・{combined with means for controlling the frequency of a further oscillator, e.g. for negative frequency feedback or AFC}

H03D 3/244 ・・・・{combined with means for obtaining automatic gain control}

H03D 3/245 ・・・・{using at least twophase detectors in the loop (H03D 3/244 takes precedence; in general H03L 7/087)}

H03D 3/247 ・・・・{using a controlled phase shifter (in general H03L 7/081)}

H03D 3/248 ・・・・{with means for eliminating interfering signals, e.g. by multiple phase locked loops (multiple loops in general H03L 7/07, H03L 7/22)}

H03D 3/26 ・by means of sloping amplitude/frequency characteristic of tuned or reactive circuit (H03D 3/28 to H03D 3/32 takes precedence)

H03D 3/28 ・Modifications of demodulators to reduce effects of temperature variations ({automatic frequency regulation in receivers H03J}; automatic frequency control H03L)

H03D 3/30 ・by means of transit-time tubes

H03D 3/32 ・by deflecting an electron beam in a discharge tube (H03D 3/30 takes precedence)

H03D 3/34 ・by means of electromechanical devices (H03D 3/16 takes precedence)

H03D 5/00 Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will (H03D 9/00, H03D 11/00 take precedence)

H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing (H03D 9/00, H03D 11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F)

H03D 7/005 ・{by means of superconductive devices}

H03D 7/02 ・by means of diodes (H03D 7/14 to H03D 7/22 take precedence)

H03D 7/04 ・・having {a partially} negative resistance characteristic, e.g. tunnel diode

H03D 7/06 ・by means of discharge tubes having more than two electrodes (H03D 7/14 to H03D 7/22 take precedence)

H03D 7/08 ・・the signals to be mixed being applied between the same two electrodes

H03D 7/10 ・・the signals to be mixed being applied between different pairs of electrodes

H03D 7/12 ・by means of semiconductor devices having more than two electrodes (H03D 7/14 to H03D 7/22 take precedence)

H03D 7/125 ・・{with field effect transistors}

H03D 7/14 ・Balanced arrangements

H03D 7/1408 ・・{with diodes}

H03D 7/1416 ・・{with discharge tubes having more than two electrodes}

H03D 7/1425 ・・{with transistors}

H03D 7/1433 ・・・{using bipolar transistors (H03D 7/145 takes precedence)}

H03D 7/1441 ・・・{using field-effect transistors (H03D 7/145 takes precedence)}

H03D 7/145 ・・・{using a combination of bipolar transistors and field-effect transistors}

H03D 7/1458 ・・・{Double balanced arrangements, i.e. where both input signals are differential}

H03D 7/1466 ・・・{Passive mixer arrangements}

H03D 7/1475 ・・・{Subharmonic mixer arrangements}

H03D 7/1483 ・・・{comprising components for selecting a particular frequency component of the output}

H03D 7/1491 ・・・{Arrangements to linearise a transconductance stage of a mixer arrangement}

H03D 7/16 ・Multiple-frequency-changing

H03D 7/161 ・・{all the frequency changers being connected in cascade}

H03D 7/163 ・・・{the local oscillations of at least two of the frequency changers being derived from a single oscillator}

H03D 7/165 ・・{at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature (combined with amplitude demodulation H03D 1/2245, combined with angle demodulation H03D 3/007; N-path filters H03H 19/002)}

H03D 7/166 ・・・{using two or more quadrature frequency translation stages}

H03D 7/168 ・・・・{using a feedback loop containing mixers or demodulators}

H03D 7/18 ・Modifications of frequency-changers for eliminating image frequencies {(H03D 7/16 takes precedence)}

H03D 7/20 ・by means of transit-time tubes

H03D 7/22 ・by deflecting an electron beam in a discharge tube (H03D 7/20 takes precedence)

H03D 9/00 Demodulation or transference of modulation of modulated electromagnetic waves (demodulating light, transferring modulation in light waves G02F 2/00)

H03D 9/02 ・Demodulation using distributed inductance and capacitance, e.g. in feeder lines

H03D 9/04 ・・for angle-modulated oscillations

H03D 9/06 ・Transference of modulation using distributed inductance and capacitance

H03D 9/0608 ・・{by means of diodes}

H03D 9/0616 ・・・{mounted in a hollow waveguide (H03D 9/0641 takes precedence)}

H03D 9/0625 ・・・{mounted in a coaxial resonator structure}

H03D 9/0633 ・・・{mounted on a stripline circuit}

H03D 9/0641 ・・・・{located in a hollow waveguide}

H03D 9/065 ・・{by means of discharge tubes having more than two electrodes}

H03D 9/0658 ・・{by means of semiconductor devices having more than two electrodes}

H03D 9/0666 ・・・{using bipolar transistors (H03D 9/0683 takes precedence)}

H03D 9/0675 ・・・{using field effect transistors (H03D 9/0683 takes precedence)}

H03D 9/0683 ・・・{using a combination of bipolar transistors and field effect transistors}

H03D 11/00 Super-regenerative demodulator circuits {applications in responders G01S}

H03D 11/02 ・for amplitude-modulated oscillations

H03D 11/04 ・・by means of semiconductor devices having more than two electrodes

H03D 11/06 ・for angle-modulated oscillations

H03D 11/08 ・・by means of semiconductor devices having more than two electrodes

H03D 13/00 Circuits for comparing the phase or frequency of two mutually-independant oscillations {(measuring phase G01R 25/00; phase-discriminators with yes/no output G01R 25/005)}

H03D 13/001 ・{in which a pulse counter is used followed by a conversion into an analog signal}

H03D 13/002 ・・{the counter being an up-down counter}

H03D 13/003 ・{in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means}

H03D 13/004 ・・{the logic means delivering pulses at more than one terminal, e.g. up and down pulses}

H03D 13/005 ・{in which one of the oscillations is, or is converted into, a signal having a special waveform, e.g. triangular}

H03D 13/006 ・・{and by sampling this signal by narrow pulses obtained from the second oscillation}

H03D 13/007 ・{by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations}

H03D 13/008 ・・{using transistors}

H03D 13/009 ・・{using diodes}

H03D 99/00 Subject matter not provided for in other groups of this subclass

H03D 2001/00 Demodulation of amplitude-modulated oscillations (H03D 5/00, H03D 9/00, H03D 11/00 take precedence)

H03D 2001/22 ・Homodyne or synchrodyne circuits {(receiver circuits H04B 1/30)}

H03D 2001/2245 ・・{using two quadrature channels (H03D 1/2209 takes precedence)}

H03D 2001/2254 ・・・{and a phase locked loop}

H03D 2001/2263 ・・・・including a counter or a divider in the PLL

H03D 2009/00 Demodulation or transference of modulation of modulated electromagnetic waves (demodulating light, transferring modulation in light waves G02F 2/00)

H03D 2009/06 ・Transference of modulation using distributed inductance and capacitance

H03D 2009/0691 ・・by means of superconductive devices

H03D 2200/00 Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D

H03D 2200/0001 ・Circuit elements of demodulators

H03D 2200/0003 ・・Rat race couplers

H03D 2200/0005 ・・Wilkinson power dividers or combiners

H03D 2200/0007 ・・Dual gate field effect transistors

H03D 2200/0009 ・・Emitter or source coupled transistor pairs or long tail pairs

H03D 2200/0011 ・・Diodes

H03D 2200/0013 ・・・Diodes connected in a ring configuration

H03D 2200/0015 ・・・Diodes connected in a star configuration

H03D 2200/0017 ・・Intermediate frequency filter

H03D 2200/0019 ・・Gilbert multipliers

H03D 2200/0021 ・・Frequency multipliers

H03D 2200/0023 ・・Balun circuits

H03D 2200/0025 ・・Gain control circuits

H03D 2200/0027 ・・・including arrangements for assuring the same gain in two paths

H03D 2200/0029 ・・Loop circuits with controlled phase shift

H03D 2200/0031 ・・PLL circuits with quadrature locking, e.g. a Costas loop

H03D 2200/0033 ・・Current mirrors

H03D 2200/0035 ・・Digital multipliers and adders used for detection

H03D 2200/0037 ・・Diplexers

H03D 2200/0039 ・・Exclusive OR logic circuits

H03D 2200/0041 ・Functional aspects of demodulators

H03D 2200/0043 ・・Bias and operating point

H03D 2200/0045 ・・Calibration of demodulators

H03D 2200/0047 ・・Offset of DC voltage or frequency

H03D 2200/0049 ・・Analog multiplication for detection

H03D 2200/005 ・・Analog to digital conversion

H03D 2200/0052 ・・Digital to analog conversion

H03D 2200/0054 ・・Digital filters

H03D 2200/0056 ・・・including a digital decimation filter

H03D 2200/0058 ・・・using a digital filter with interpolation

H03D 2200/006 ・・Signal sampling

H03D 2200/0062 ・・・Computation of input samples, e.g. successive samples

H03D 2200/0064 ・・Detection of passages through null of a signal

H03D 2200/0066 ・・Mixing

H03D 2200/0068 ・・・by computation

H03D 2200/007 ・・・by using a logic circuit, e.g. flipflop, XOR

H03D 2200/0072 ・・・by complex multiplication

H03D 2200/0074 ・・・using a resistive mixer or a passive mixer

H03D 2200/0076 ・・・using a distributed mixer

H03D 2200/0078 ・・・using a switched phase shifter or delay line

H03D 2200/008 ・・Hilbert type transformation

H03D 2200/0082 ・・Quadrature arrangements

H03D 2200/0084 ・・Lowering the supply voltage and saving power

H03D 2200/0086 ・・Reduction or prevention of harmonic frequencies

H03D 2200/0088 ・・Reduction of intermodulation, nonlinearities, adjacent channel interference; intercept points of harmonics or intermodulation products

H03D 2200/009 ・・Reduction of local oscillator or RF leakage

H03D 2200/0092 ・・Detection or reduction of fading in multipath transmission arrangements

H03D 2200/0094 ・・Measures to address temperature induced variations of demodulation

H03D 2200/0096 ・・・by stabilising the temperature

H03D 2200/0098 ・・・by compensating temperature induced variations