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| Number | Title | Issue Date |
| 7421254 | High linearity, high efficiency power amplifier with DSP assisted linearity optimization A communications transceiver includes a baseband processor, a receiver section, and a transmitter section that includes a power amplifier. The receiver and transmitter sections communicatively couple to the baseband processor. In a calibration operation, the baseban... | 09/02/2008 |
| 7174137 | Wireless transmit-only apparatus and method A wireless transmit-only apparatus (20) can be comprised of a controller (21) that selectively controls which of a plurality of resonant devices (24 and 25) are utilized to influence the transmission carrier frequency of a transmitter ( | 02/06/2007 |
| 7111181 | Apparatus for discovering a powerability condition of a computer network The invention is directed to techniques for discovering a powerability condition of a computer network such as the existence of a remotely powerable device attached to a connecting medium of the computer network. Such detection can then control whether a remote powe... | 09/19/2006 |
| 7095805 | Digital TV receiver A device of digital TV receiver including an A/D converter for converting an analog signal into a digital passband signal, a carrier recovery for converting the digital passband signal into a digital baseband signal, and a symbol clock recovery for calculating the d... | 08/22/2006 |
| 7079571 | Method and circuits for power management in a transceiver A transceiver circuit having 10 mb and 100 mb transmit and receive circuitries using the power saving methods allows for power consumption of the transceiver circuit to be significantly reduced. This is accomplished by providing each defined subcircuit with its own ... | 07/18/2006 |
| 7046957 | Reflecting modulator circuit comprising a negative impedance amplifier A modulator circuit comprises a negative impedance amplifier which is operable such that a signal applied to the amplifier is reflected and amplified. Switching circuitry is provided for switching the impedance of the amplifier between two reflecting states such tha... | 05/16/2006 |
| 7027498 | Data adaptive ramp in a digital filter A system and method for improving the performance of digital filters. The data bandwidth and spectral control are improved by adaptively selecting ramp-up and ramp-down symbols based on the actual filtered data. Thus, the energy in the truncated tail of the filter i... | 04/11/2006 |
| 6938172 | Data transformation for the reduction of power and noise in CMOS structures A data transformation algorithm is selectively applied to each data vector as it enters the pipelined structure. In a selection step, the algorithm compares the bit value of the new data vector with the corresponding bit values of the preceding data vector, and sums... | 08/30/2005 |
| 6842519 | Communication with current detection Apparatuses and methods are disclosed for communications using current detection. According to one embodiment, a transmitter generates a signal on a transmission line by switching between two power sources. According to one embodiment, the transmitted signal is a ba... | 01/11/2005 |
| 6798840 | Fast switchover output protection The invention is a communication system having a series of output modules that provide continuous synchronization output signals. Each output module has a driver assembly has a driver output and a backup selector output that is capable of driving a failed next drive... | 09/28/2004 |
| 6690945 | Method for suppressing transients using a pulse shaping look-up table The pulse-shaping look-up table with transient suppression (530) avoids hard turn-on and turn-off transients by modifying word segments of initial and final digital words during transmission of a digital data sequence. A controller (570) sends a mode sign... | 02/10/2004 |
| 6487264 | RF modem apparatus An RF modem used with a host device for transmitting information to, and receiving information from, other host devices. Prior to a transmission, the information is Manchester encoded and transmitted by On/Off Keying. A superregenerative receiver circuit ... | 11/26/2002 |
| 6434135 | Adaptive RF amplifier prelimiter The invention reduces transient peaks in signals transmitted in CDMA communication systems. A plurality of spread spectrum data signals are combined into a combined signal having fluctuating power level corresponding to the combination of the data signals... | 08/13/2002 |
| 6208694 | Reduced power supervisory message transmission in a wireless alarm system A self testing wireless data communications system suitable for use with an alarm system, the transmitting element of the communications system is capable of transmitting at two different output power levels. If the message is a supervisory message, it is... | 03/27/2001 |
| 6070088 | Mobile telephone set with automatic sound level control In a portable telephone set having an audio-frequency amplifier (12) for amplifying a sound signal from a microphone (11) and a codec (13),for digitizing and coding the sound signal into a digital sound signal which is transmitted therefrom, a level of sa... | 05/30/2000 |
| 6034999 | Burst signal transmitter capable of producing correct transmission output in initial burst signal In a burst signal transmitting apparatus for power-amplifying a burst signal to transmit the power-amplified burst signal, a correct transmission output can be obtained even in an initial burst signal after a power supply is turned ON. In this burst signa... | 03/07/2000 |
| 5960333 | Circuitry and method for power calibration A method and circuitry for improved output power level calibration/compensation/control is disclosed. A single RF detector diode is employed, to which a bias current is applied prior to applying a coupled amount of the transmitted radio frequency signal t... | 09/28/1999 |
| 5825827 | Dynamically compensated linear regulator for pulsed transmitters A system to alter the voltage supplied to the linear regulator of a pulsed transmitter in accordance with the temperature of the regulator, the minimum voltage required for a transmission and the specific aircraft installation requirements so as to reduce... | 10/20/1998 |
| 5822373 | Method and apparatus for optimization of wireless communications A unique wireless transmission signal structure has a preamble at a first data rate and a data portion including the base band signal at a second, higher data rate. The signal is generated in a manner which ensures that the transmitted signal is "on" no m... | 10/13/1998 |
| 5712849 | Information transmission system comprising at least a base station and a satellite station, and station forming part of such a system An information transmission system includes a base station with a base transmitter and a plurality of satellite stations. Each satellite station includes a satellite receiver for receiving a transmission from the base station and a satellite transmitter i... | 01/27/1998 |
| 5675611 | Output power control and envelope shaping for a pulsed transmitter Some mobile station cellular networks use either amplitude modulation or constant envelope modulation depending on the situation. The pulsed transmitter of the mobile station is switched on and off by a first control signal (TXP) and the output power enve... | 10/07/1997 |
| 5621763 | Apparatus and method for generating a transition between the on and off states of a radio frequency transmitter An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409)... | 04/15/1997 |
| 5537418 | Data transmit resynchronization at a node An array of Digital data processing nodes are shown arrayed in at least one node-ring where each node has its own transmission-clock which is approximately the same frequency as the transmission-clock of other nodes in the ring and where data is transferr... | 07/16/1996 |
| 5515011 | Pulsed magnetron circuit with phase locked loop A semiconductor diode is connected across the cathode-to-anode path of a magnetron and through a storage capacitor and collector resistor to a supply voltage for enabling charging of the capacitor. A control pulse causes a switching transistor to conduct ... | 05/07/1996 |
| 5253270 | Apparatus useful in radio communication of digital data using minimal bandwidth Apparatus useful for communicating digital data using a steady stream of pulses which achieve very high ratios of bit rate per occupied bandwidth using digital signal synthesis techniques to produce a stream of constant phase tone pulses having exceptiona... | 10/12/1993 |
| 5196806 | Output level control circuit for use in RF power amplifier An output level control circuit for a high frequency power amplifier for amplifying high frequency signals having the "on" and "off" periods of transmit signals in a fixed recurrent cycle such as in a TDMA radio communication system or a GSM system. The h... | 03/23/1993 |
| 5159283 | Power amplifier The power amplifier in accordance with the invention is responsive to a power level control signal so as to amplify radio frequency signals to define any one of a plurality of amplifier output power envelopes. The power amplifier comprises means for gener... | 10/27/1992 |
| 4980898 | Self-oscillating burst mode transmitter with integral number of periods A self-oscillating burst mode transmitter transmits an integral number of cycles of a carrier signal in each transmission burst. Each burst commences at a peak value of the carrier signal and terminates at a peak value. The transmitter includes an L-C tan... | 12/25/1990 |
| 4882506 | Low voltage and low power detector circuits Low voltage and low power circuits for use in a subscriber power controller includes a low voltage detection circuit for generating a first output signal switching between ECL logic levels and a low power detection circuit for generating a second output s... | 11/21/1989 |
| 4805214 | Digital signal transmitting circuit for telephone network A circuit is disclosed for the transmission of digital signals on a bifilary line, especially a telephone line. The circuit disclosed is a so-called S interface circuit which has to produce digital signals within certain set limits. The proposed circuit u... | 02/14/1989 |
| 4794622 | Low power transmitter frequency stabilization An improved miniature hand-held low power transmitter utilizing a surface acoustic wave (SAW) resonator as the control element to establish the carrier frequency of the oscillator. The SAW resonator stabilizes the frequency of the transmitter to within 0.... | 12/27/1988 |
| 4755773 | Phase modulator apparatus for generating a burst phase-modulated wave A time division communication system tends to develop noise responsive to variations of the output of the voltage supply which occur as the time slot signals switch on or off to thereby vary the load demand placed upon the power supply. The invention elim... | 07/05/1988 |
| 4644293 | RF pulse modulated amplifier having conduction angle control A pulse modulated amplifier is described comprising a power transistor having a grounded base, an emitter for receiving a drive signal to be amplified, and a collector for emitting a high frequency pulse, the power transistor operating over a substantiall... | 02/17/1987 |
| 4631736 | Portable transmitter which conserves transmitter power by storing charges from previous pulses A portable transmitter for transmitting a magnetic signal is disclosed. The transmitter is provided with a transmitting coil for generating a magnetic signal upon receiving an electric current from a dry cell through an intermittently operating electric c... | 12/23/1986 |
| 4630289 | Emergency locator transmitter incident time correlator In an emergency locator transmitter of a type wherein a standard distress signal is transmitted following a distress incident, the distress signal is encoded with data identifying the absolute time of the incident or the amount of time that has elapsed si... | 12/16/1986 |
| 4583073 | Remote monitoring system transmitter and power supply therefor A solid state remote monitoring transmitter which transmits a 40 bit word that contains status information about a transformer via the secondary of a power distribution network to a central receiver associated with the primary (feeder) cable supplying the... | 04/15/1986 |
| 4577166 | Miniature high performance pulsed modulator apparatus A pulsed modulator apparatus having a ground deck clock driver unit to provide pulse stretching and on-off trigger signals for a floating deck transistor switch unit. Voltage isolation is achieved between the ground and floating deck units through the use... | 03/18/1986 |
| 4495649 | Power source device for portable type radio apparatus A power source device for a portable type radio apparatus having a transmitting circuit wherein the transmitting circuit is connected to the power source through a time constant circuit and a tone signal generating circuit is connected to the time constan... | 01/22/1985 |
| 4412141 | Three state loop keyer A transistorized keying circuit is described which provides for both polar and neutral interfacing. The circuit comprises an oscillator, an AND gate, an exclusive OR gate, a transformer, and two similar output circuits each of which is connected to the se... | 10/25/1983 |
| 4356457 | Optic floating deck modulator An optical floating deck modulator to modulate a control element of an electron device, such as the grid of a Klystron tube or traveling wave tube, having two high power MOSFET switching devices connected in series between a high positive and a high negat... | 10/26/1982 |
