Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7505751 | Wireless mesh architecture A wireless mesh network architecture includes a plurality of wireless nodes, with each wireless node in the network is connected to every other wireless node in the network. Each pair of wireless nodes is coupled by a link dedicated to exchange of data by the pair o... | 03/17/2009 |
| 7415262 | Wireless access point power control An access point in a wireless network receives link margin values from associated access points. The access point determines sensitivity values for the associated access points and determines a lower access point output power value from the sensitivity values. Beaco... | 08/19/2008 |
| 7411931 | Inter-frequency measurements with MIMO terminals The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20′ in accordance with the invention includes at least one radio transceiver including P radio receivers and at least one transmitter (16 | 08/12/2008 |
| 7339427 | Analogue power control in a saturated amplifier A circuit is disclosed having a first series circuit path including a first switching transistor, a cascode transistor disposed in cascode arrangement with the first switching transistor, a transformer, and a fourth switching transistor. The circuit also has a secon... | 03/04/2008 |
| 7327775 | CDMA receiver A signal reception method including method and apparatus for receiving a signal, down converting the received signal through multi-tone down conversion to form an intermediate signal, and decoding the intermediate signal to extract data. In an embodiment, the receiv... | 02/05/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7200633 | Information delivery system and information delivery method An information delivery system and information delivery method can provide information delivery services that utilize network resources efficiently. A push server 3 transmits data associated with summary content 15 (summary of detailed content 23 | 04/03/2007 |
| 7187934 | Method and apparatus for steering idle mobile stations Load redistribution and other benefits may be achieved by dynamically distributing or “steering” idle mobile stations to a particular cell or area. For example, idle mobile stations may be steered from a loaded cell to less loaded cells by changing one or more c... | 03/06/2007 |
| 7177619 | Dual gate FinFET radio frequency switch and mixer A method modifies dual gate transistor into a radio frequency switch. The method attaches a first signal input to a first gate of the transistor, attaches a second signal input to the source or drain of the transistor, attaches a common gate contact to the first gat... | 02/13/2007 |
| 7177620 | Mixer constant linear range biasing apparatus and method A Gilbert cell mixer for a wireless transceiver includes a first stage that performs voltage to current conversions and that includes first and second transistors that are operated in a saturation region and third and fourth transistors that are operated in a triode... | 02/13/2007 |
| 7110444 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 09/19/2006 |
| 7110435 | Spread spectrum applications of universal frequency translation Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an... | 09/19/2006 |
| 7082171 | Phase shifting applications of universal frequency translation A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT modul... | 07/25/2006 |
| 7072390 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 07/04/2006 |
| 7054296 | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ... | 05/30/2006 |
| 7039372 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 05/02/2006 |
| 7035234 | Optimized sleep mode operation The invention relates to operations in TDD (time division duplex) mode in third generation cellular telecommunication systems. According to the invention, the power level of midamble of the burst sent in the slot of the PICH channel has a predefined relation to the ... | 04/25/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7010286 | Apparatus, system, and method for down-converting and up-converting electromagnetic signals Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive o... | 03/07/2006 |
| 7006805 | Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service A receiver having multi-mode and multi-band functionality and capabilities is described herein. The receiver is capable of selectively operating over a plurality of bands and channels. The receiver operates in a plurality of modes, including but not limited to a sin... | 02/28/2006 |
| 6778132 | Microwave sensor A microwave sensor is described, with a self-mixing oscillator (1), with a transmitting and receiving antenna (2), with an impedance (3) which is connected between the current or voltage supply (4) and the oscillator (2), and with ... | 08/17/2004 |
| 6741587 | Inter-frequency measurements with MIMO terminals The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20′ in accordance with the invention includes at least one radio transceiver including P radio receivers and at least one transmitter (16 | 05/25/2004 |
| 6437659 | Push-pull arrangement A cost-effective push-pull arrangement for distributing the power output of the signal from the mixing/local oscillator, so that the transistors are able to be modulated with the same power and with 180° phase shift, and so that, in spite of manufacturin... | 08/20/2002 |
| 6138000 | Low voltage temperature and Vcc compensated RF mixer An RF mixer utilizing frequency and bias compensation for improved performance characteristics. The RF mixer receives bias signals that are dependent on VCC levels to internally balance the local oscillation received and mix the perfectly bias ... | 10/24/2000 |
| 6029054 | MMIC receiver A receiver, especially useful for MMIC semiconductor communications circuits, in which plural mixers replace LRC filter networks to produce notched bandwidth filters. In a preferred embodiment, the input signal and a the output of a variable oscillator ar... | 02/22/2000 |
| 5661424 | Frequency hopping synthesizer using dual gate amplifiers A frequency hopping synthesizer is constructed from two FET-based multiplier circuits each responsive to a carrier input signal and a modulation signal to produce respective output signals which are in-phase combined to provide a frequency-shifted signal.... | 08/26/1997 |
| 5506869 | Methods and apparatus for estimating carrier-to-interference ratios at cellular radio base stations In methods and apparatus for estimating carrier-to-interference ratios of signals transmitted between cellular radio base stations and mobile units, a SAT signal is transmitted from a base station to a mobile unit served by that base station. The mobile u... | 04/09/1996 |
| 5465418 | Self-oscillating mixer circuits and methods therefor Self-oscillating mixer circuits for use in communications systems. The circuits comprise a push-pull amplifier for amplifying a signal having a first frequency to produce an amplified signal, a feedback loop coupled to the push-pull amplifier for phase sh... | 11/07/1995 |
| 5214397 | Modulator using low-pass filter as delay element A push-pull modulator stage 70 has two possible transmission paths, an electrically short path (7) and a phase delay path (6) with a phase delay element providing a phase shift of approximately 180°. The phase delay element has the form of a low pass fil... | 05/25/1993 |
| 5153536 | Suppressed carrier modulator formed from two partial modulators each including a phase delay path A modulator suitable for 16 quadrature amplitude modulation (QAM) is designed as a double modulator (1), wherein a 16 QAM modulator (39) consists of two double modulators (1). One double modulator (1) has two partial modulators (1',1") forming a bridge. E... | 10/06/1992 |
| 5060299 | Radio frequency mixer circuit utilizing interface transformers and switching diodes A diode mixer characterized by low levels of intermodulation distortion. The mixer circuit includes a center-tapped input transformer for coupling the circuit to local oscillator and radio frequency signal sources and a center-tapped output transformer fo... | 10/22/1991 |
| 5003620 | Tuner circuit and receiving band change-over circuit with a push-pull amplifier Plural circuits for generating intermediate frequency signals such as UHF, VHF, HYPER intermediates frequency signals, etc. are provided in parallel. Each of the plural circuits includes an intermediate frequency amplifier, whose output impedance varies b... | 03/26/1991 |
| 4994755 | Active balun A double balun circuit is provided by connecting two pairs of circut types. The first circuit, a distributed divider circuit, includes first and second pluralities of field effect transistors, a common input transmission line, and a first and second outpu... | 02/19/1991 |
| 4727596 | High dynamic range mixer A high performance, double-balanced mixer comprising a novel transformer and a pair of variable conductance semiconductor devices connected thereto which provides an output signal being the product of two input signals. Two transformer windings each inclu... | 02/23/1988 |
| 4704738 | Transistor amplifier and mixer input stage for a radio receiver The input stage of a radio receiver incudes a differential amplifier circuit, whose gain is adjusted by a voltage generated by an AGC circuit, and a mixer circuit. An attenuator stage with a predetermined attenuation coefficient is coupled between the inp... | 11/03/1987 |
| 4677691 | Microwave receiver A microwave oscillator provides two outputs, of opposite phase, which are directly connected to provide the local oscillator inputs to a balanced mixer. Since no balun is used, very wide-band performance can be obtained.... | 06/30/1987 |
| 4675911 | Monolithic microwave integrated circuit broadband mixer A monolithic microwave integrated circuit broadband mixer in which the distributed amplifier concept is used to develop a broadband mixer circuit.... | 06/23/1987 |
| 4661999 | Microwave push-pull frequency converter In a microwave push-pull frequency converter having the form of a waveguide for effecting frequency conversion of a broadband microwave signal, which converter includes a converter module composed of a waveguide section and a pair of semiconductor mixer e... | 04/28/1987 |
