An amplifying system is provided for use as a high sensitivity receive booster or replacement for a low noise amplifier in a receive chain of a communication device. The amplifying system includes an amplifying circuit configured to receive an input signal having a first frequency and generate an oscillation based on the input signal, a sampling circuit coupled to the amplifying circuit and configured to terminate the oscillation based on a predetermined threshold to periodically clamp and restart the oscillation to generate a series of pulses modulated by the oscillation and by the input signal, and one or more resonant circuits coupled with the amplifying circuit and configured to establish a frequency of operation and to generate an output signal having a second frequency, the second frequency being substantially the same as the first frequency.
H03F 3/193 - Amplificateurs à haute fréquence, p. ex. amplificateurs radiofréquence comportant uniquement des dispositifs à semi-conducteurs comportant des dispositifs à effet de champ
H03F 1/56 - Modifications des impédances d'entrée ou de sortie, non prévues ailleurs
H03F 3/195 - Amplificateurs à haute fréquence, p. ex. amplificateurs radiofréquence comportant uniquement des dispositifs à semi-conducteurs dans des circuits intégrés
H04B 1/22 - Circuits pour récepteurs ne comportant pas la génération d'une onde locale
H03L 7/06 - Commande automatique de fréquence ou de phaseSynchronisation utilisant un signal de référence qui est appliqué à une boucle verrouillée en fréquence ou en phase
H03F 1/38 - Circuits à réaction sans contre-réaction
H03F 3/72 - Amplificateurs commandés, c.-à-d. amplificateurs mis en service ou hors service au moyen d'un signal de commande
2.
Amplifier system for use as high sensitivity selective receiver without frequency conversion
An amplifying system is provided for use as a high sensitivity receive booster or replacement for a low noise amplifier in a receive chain of a communication device. The amplifying system includes an amplifying circuit configured to receive an input signal having a first frequency and generate an oscillation based on the input signal, a sampling circuit coupled to the amplifying circuit and configured to terminate the oscillation based on a predetermined threshold to periodically clamp and restart the oscillation to generate a series of pulses modulated by the oscillation and by the input signal, and one or more resonant circuits coupled with the amplifying circuit and configured to establish a frequency of operation and to generate an output signal having a second frequency, the second frequency being substantially the same as the first frequency.
H03F 3/193 - Amplificateurs à haute fréquence, p. ex. amplificateurs radiofréquence comportant uniquement des dispositifs à semi-conducteurs comportant des dispositifs à effet de champ
H03F 1/56 - Modifications des impédances d'entrée ou de sortie, non prévues ailleurs
H03F 3/195 - Amplificateurs à haute fréquence, p. ex. amplificateurs radiofréquence comportant uniquement des dispositifs à semi-conducteurs dans des circuits intégrés
H04B 1/22 - Circuits pour récepteurs ne comportant pas la génération d'une onde locale
H03L 7/06 - Commande automatique de fréquence ou de phaseSynchronisation utilisant un signal de référence qui est appliqué à une boucle verrouillée en fréquence ou en phase
H03F 1/38 - Circuits à réaction sans contre-réaction
H03F 3/72 - Amplificateurs commandés, c.-à-d. amplificateurs mis en service ou hors service au moyen d'un signal de commande
3.
SMALL FORM FACTOR CPL ANTENNA WITH BALANCED FED DIPOLE ELECTRIC FIELD RADIATOR
An antenna is disclosed with a magnetic loop, a dipole electric field radiator inside the magnetic loop, and with symmetric geometry about the feed. This symmetry allows for realization of image theory and significant size reduction, whereby half of the antenna is removed and replaced by the image induced in a connected ground plane.
H01Q 9/00 - Antennes électriquement courtes dont les dimensions ne sont pas supérieures à deux fois la longueur d'onde et constituées par des éléments rayonnants conducteurs actifs
H01Q 9/16 - Antennes résonnantes avec alimentation intermédiaire entre les extrémités de l'antenne, p. ex. dipôle alimenté par le centre
H01Q 9/30 - Antennes résonnantes avec alimentation à l'extrémité d'un élément actif allongé, p. ex. unipôle
H01Q 7/00 - Cadres ayant une distribution du courant sensiblement uniforme et un diagramme de rayonnement directif perpendiculaire au plan du cadre
4.
COMPOUND LOOP ANTENNA SYSTEM WITH ISOLATION FREQUENCY AGILITY
An antenna system is provided, including a first antenna, a second antenna, a ground plane, and a resonant isolator located proximate to the first antenna and the second antenna. The resonant isolator is coupled to the ground plane at or proximate to one current null point created by a first antenna and at or proximate to a second current null point created by a second antenna, and is configured to isolate the first antenna from the second antenna at a resonance. In some cases, the resonant isolator may include at least two conductive portions that may be substantially parallel to one another. The resonant isolator may also include an active tuning element that may change the resonance at which the resonant isolator de-couples the two antennas. In some cases, each of the antennas may be a capacitively-coupled compound loop antenna.
A method is provided for communicating signals at a low power level in an electromagnetic interference (EMI) environment. A first device transmits a modulated signal having a first carrier frequency, including the encoded information via a hardwire transmission medium. In one aspect, the power level of the modulated signal can be adjusted to minimize power consumption or reduce the generation of EMI. The modulated signal may be in one of the following formats: frequency modulation (FM) or phase modulation (PM) to name a few examples. A second device including a logarithmic detector amplifier (LDA) demodulator circuit receives the signal, which may be mixed with EMI. The LDA demodulator circuit amplifies the modulated signal, without amplifying the EMI, to supply a demodulated baseband signal, which may be an n-ary digital signal, or an audio signal. A low-power, noise insensitive communication channel is also provided.
A method is provided for communicating signals at a low power level in an electromagnetic interference (EMI) environment. A first device transmits a modulated signal having a first carrier frequency, including the encoded information via a hardwire transmission medium. In one aspect, the power level of the modulated signal can be adjusted to minimize power consumption or reduce the generation of EMI. The modulated signal may be in one of the following formats: frequency modulation (FM) or phase modulation (PM) to name a few examples. A second device including a logarithmic detector amplifier (LDA) demodulator circuit receives the signal, which may be mixed with EMI. The LDA demodulator circuit amplifies the modulated signal, without amplifying the EMI, to supply a demodulated baseband signal, which may be an n-ary digital signal, or an audio signal. A low-power, noise insensitive communication channel is also provided.
H04B 14/04 - Systèmes de transmission non caractérisés par le milieu utilisé pour la transmission caractérisés par l'utilisation de la modulation par impulsions utilisant la modulation par impulsions codées
7.
ADAPTIVE LINE EQUALIZER FOR IMPROVING DATA COMMUNICATION OVER LESS THAN PERFECT POWER LINES OR TRANSMISSION LINES
Systems and methods for improving data communication over less than perfect power lines or transmission lines are described. The systems and methods allow for pushing out electrically any null within a frequency range of interest and/or for lossless transmission by providing impedance matching between communication devices and the transmission line. This is achieved by implementing line equalizing modules within the transceivers, at the transmitter side and/or the receiver side, or by plugging, as a stand-alone module, into an electrical outlet within a building. The line equalizing module includes multiple inductor-capacitor cells coupled in cascade where multiple switches allow for selective and concurrent connection between the inductor-capacitor cells. In another embodiment, the line equalizing module includes variable inductor-capacitor cells. The line equalizing module provides a variable propagation delay that allows for stretching electrically the transmission line. Further improvement may achieve by adjusting the operational frequency using an up-conversion or down-conversion operation.
A method is provided for communicating signals at a low power level in an electromagnetic interference (EMI) environment. A first device transmits a modulated signal having a first carrier frequency, including the encoded information via a hardwire transmission medium. In one aspect, the power level of the modulated signal can be adjusted to minimize power consumption or reduce the generation of EMI. The modulated signal may be in one of the following formats: frequency modulation (FM) or phase modulation (PM) to name a few examples. A second device including a logarithmic detector amplifier (LDA) demodulator circuit receives the signal, which may be mixed with EMI. The LDA demodulator circuit amplifies the modulated signal, without amplifying the EMI, to supply a demodulated baseband signal, which may be an n-ary digital signal, or an audio signal. A low-power, noise insensitive communication channel is also provided.
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