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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 8442472 | Technique to generate divide by two and 25% duty cycle A frequency divider with a twenty-five percent duty cycle is disclosed. A frequency divider may include an input configured to receive a clock signal, each cycle of the clock signal including a first phase and a second phase, a plurality of latches, and a plurality ... | 05/14/2013 |
| 8346201 | Asynchronous first in first out interface, method thereof and integrated receiver An asynchronous FIFO interface having a readout clock asynchronous with a write clock is provided. The asynchronous FIFO interface includes a FIFO buffer, a clock controller, a reference source and a signal source. The FIFO buffer receives a digital signal from an A... | 01/01/2013 |
| 8340619 | Phase synchronization of phased array or multiple receiver/transmitter systems In one embodiment, a local oscillator (LO) is configured to generate an LO signal. A transmission line receives the LO signal from the local oscillator and transmits the LO signal. A first set of taps and a second set of taps tap the transmission line to receive the... | 12/25/2012 |
| 8285241 | Receiver apparatus having filters implemented using frequency translation techniques A method and apparatus is disclosed to effectively frequency translate a filter characterized as a low quality factor (Q) filter corresponding to a baseband frequency of approximately zero Hertz or to an intermediate frequency (IF) to a filter characterized as a hig... | 10/09/2012 |
| 8131248 | Mixer with local oscillator feed-forward and method of mixing signals with local oscillator feed-forward A feed-forward device is provided for a mixer including a diplexer having a radio frequency port, an intermediate frequency port, and a common port; and a mixing circuit receiving an in-phase local oscillator signal and an out-of-phase local oscillator signal and ha... | 03/06/2012 |
| 8107919 | RF receiver A radio frequency (RF) receiver includes an oscillator for outputting an oscillation signal from an output port thereof, a limiter for dividing the oscillation signal output from the oscillator into a branch signal at a predetermined dividing ratio outputting the br... | 01/31/2012 |
| 8064869 | Electronic mixer The present invention discloses a mixer comprising with an input stage (100) for receiving and amplifying input signals (VINP, VINN) and an output stage (300) for outputting output signals (Voutp, Voutn). A switching stage (200) is coupled betwe... | 11/22/2011 |
| 8045951 | Dual-LO mixer and radio A dual-LO mixer is disclosed. The dual-LO mixer receives an input signal, a first reference signal of a first reference frequency, and a second reference signal of a second reference frequency, and performs a frequency translation to convert the input signal into an... | 10/25/2011 |
| 8010075 | High order harmonics generator A high-order harmonics generator includes a plurality of high-pass filters to block out DC signals. In one embodiment, high-pass filters are coupled to the output signals from an envelope detector and a power detector. A high-pass filter can also be coupled to the o... | 08/30/2011 |
| 7672658 | Frequency-converting circuit and down converter with the same A frequency-converting circuit and a down converter with the frequency-converting circuit are disclosed. The above-mentioned frequency-converting circuit is used for converting an RF signal into a first baseband signal according to a poly-phase LO signal. The freque... | 03/02/2010 |
| 7657246 | Techniques for passive subharmonic mixing Particular embodiments of mixer designs permit greater integration on standard chips with an improvement in power and linearity to enable low-power, high-performance reception. Some embodiments feature a method of frequency conversion using at least two stages of sw... | 02/02/2010 |
| 7536164 | Controlling the frequency of an oscillator A technique includes selectively coupling impedances to an oscillator to establish a first frequency of operation of the oscillator. The technique includes repeating the selective coupling in a feedback loop to cause the first frequency to be near a second frequency... | 05/19/2009 |
| 7483687 | Quadrature sub-harmonic frequency down-converter A method and apparatus for frequency down-converting a radio frequency (RF) signal to baseband in two steps using the two quadrature components of a single local oscillator. In the first stage, the RF signal is mixed with both components of the local oscillator sign... | 01/27/2009 |
| 7460850 | High frequency receiving circuit provided with controller for turning on and off power supply to local oscillator A receiving circuit for receiving a high frequency signal is provided which includes a mixer, a local oscillator, a switch circuit, and a controller. The switch circuit switches over between first and second cases. The controller controls in the first case to turn o... | 12/02/2008 |
| 7460849 | Direct conversion with variable amplitude LO signals Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is... | 12/02/2008 |
| 7421263 | Circuit for reducing second order intermodulation A circuit for calibrating a second order intercept point (IP2) and for reducing second order intermodulation (IM2) includes a common mode feedback circuit and a load impedance operatively connected between first and second output terminals of a mixer in a direct con... | 09/02/2008 |
| 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 |
| 7409190 | Radio-frequency circuit module and radio communication apparatus An integrated-circuit element and passive components are mounted on a front face of a multilayer substrate. A capacitor constituting a crystal-oscillator circuit is disposed inside the multilayer substrate. A cavity is provided in a rear face of the multilayer subst... | 08/05/2008 |
| 7409198 | Wideband variable gain amplifier in an ultra wideband receiver A method (700, 1100) and apparatus (300) are provided in a receiver for applying a variable gain to a received signal including a transmitted codeword in accordance with an Ultra Wideband (UWB) protocol. A first signal is generated and input to a selec... | 08/05/2008 |
| 7398074 | Integrated transceiver circuit with low interference production and sensitivity An integrated transceiver circuit has a reception path, which in turn has a mixer unit for demodulation of a received signal. An analog/digital converter unit is connected in the reception path downstream from the mixer unit. A first frequency divider is connected b... | 07/08/2008 |
| 7386292 | 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 EM signal and recursively operating on approximate half cycles of the carrier signal. The recursive operations c... | 06/10/2008 |
| 7379723 | Local oscillator and mixer for transceiver In one embodiment, a local oscillator and mixer architecture may include a frequency divider having I and Q channel master storage elements formed of devices of a first size, and I and Q channel slave storage elements formed of devices of a second size, where the se... | 05/27/2008 |
| 7376410 | Methods and systems for down-converting a signal using a complementary transistor structure Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing ra... | 05/20/2008 |
| 7373113 | Frequency generation apparatus and method for data transmission A reference frequency generation method and apparatus for communication systems that transmit and receive data by use of an ultra wide band of at least two frequency groups having at least two reference frequencies. The method and apparatus generate the reference fr... | 05/13/2008 |
| 7369834 | Impedance-matched IQ network for an image rejection circuit An impedance-matched IQ network includes a phase shift circuit and a back termination. The phase shift circuit includes an in-phase mixer port for receiving the in-phase signal, a quadrature-phase mixer port for receiving the quadrature phase signal, a termination p... | 05/06/2008 |
| 7369835 | Image rejection mixer providing precision image rejection An image rejection mixer includes a first mixer, a second mixer, a first output adjust circuit, and a second output adjust circuit. The first mixer is coupled to receive an input RF signal and a local oscillator signal and includes a first mixer stage and a first ou... | 05/06/2008 |
| 7366486 | System and method for coarse/fine PLL adjustment An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circu... | 04/29/2008 |
| 7366297 | Method and system for converting alternating current to ethernet in-line power According to one embodiment, a method for converting alternating current voltage signals to Ethernet in-line power includes converting an alternating current voltage signal to an approximate direct current voltage signal, adding at least one odd harmonic of the appr... | 04/29/2008 |
| 7366485 | Multimode wireless transmitter and a portable wireless device using the same The circuits of a multimode wireless transmitter are complex and large, and thus difficult to incorporate in a portable wireless device. This problem is solved for a multimode wireless transmitter by enabling the first frequency mode circuit and the second frequency... | 04/29/2008 |
| 7363018 | High speed electrical interconnect using an optically distributed carrier signal Described are a method and a device for high speed transmission of a data signal across an electrical interconnect in an integrated circuit. An optical carrier is modulated with a local oscillator signal at a modulation frequency substantially greater than the data ... | 04/22/2008 |
| 7356324 | Mobile radio receiver device The invention is directed to a receiver arrangement, for example, in a mobile radio, which allows the use of slowly locking phase locked loops for a point-to-point connection between two transceivers, even in the case of a heterodyne receiver structure. The need to ... | 04/08/2008 |
| 7356318 | Quadrature subharmonic mixer A quadrature subharmonic mixer comprises a polyphase filter configured to generate quadrature components of a local oscillator (LO) reference signal, a summing and scaling element configured to create additional components of the LO reference signal, and a plurality... | 04/08/2008 |
| 7349680 | Method and system for using PSK sync word for fine tuning frequency adjustment In RF transceivers, a method and system for using phase shift key (PSK) sync word for fine tuning frequency adjustment are provided. One aspect of the invention provides for adjusting a local oscillator frequency in a radio frequency (RF) receiver when a residual DC... | 03/25/2008 |
| 7343164 | Cellular communications system employing wireless optical links The invention relates to a cellular communication system based on a central main unit, a primary-cell communication unit connected to the central main unit, and a number of secondary-cell communication units. Each secondary-cell unit is connected to the primary-cell... | 03/11/2008 |
| 7343144 | Frequency synthesizer using PLL architecture for wireless frequency allocation An apparatus method to provide a frequency synthesizer using a phase locked loop in a communication device to provide a particular frequency allocation to generate an output from the PLL. The synthesizer includes a phase locked loop (PLL) circuit that has a feedback... | 03/11/2008 |
| 7340233 | Integrated circuit and methods for third sub harmonic up conversion and down conversion of signals An integrated circuit may include a receiver and/or a transmitter that performs third order sub-harmonic conversion. The integrated circuit may include a Gilbert cell active mixer with three or more serially-connected transistors in each of the mixer's four branches... | 03/04/2008 |
| 7336940 | Frequency conversion techniques using antiphase mixing A frequency upconverter using mixers operating on one or more signals and inverted versions thereof and a subtractor, such as a balun, for subtractively combining the mixer outputs to produce an upconverted signal. ... | 02/26/2008 |
| 7332940 | Voltage hold circuit and clock synchronization circuit A voltage hold circuit which holds an input signal voltage includes a voltage comparator unit configured to output a result of comparison between a voltage of an externally inputted control signal and a voltage of an outputted analog hold signal, a digital value hol... | 02/19/2008 |
| 7323948 | Vertical LC tank device An LC tank structure. The structure, including a set of wiring levels on top of a semiconductor substrate, the wiring levels stacked on top of each other from a lowest wiring level nearest the substrate to a highest wiring level furthest from the substrate; an induc... | 01/29/2008 |
| 7324796 | Low temperature co-fired ceramic sub-harmonic mixer A sub harmonic mixer has improved electrical performance in a small package size. The mixer has a low temperature co-fired ceramic substrate. Coupled lines are located within the substrate and connected to an LO port, an RF port and an intermediate frequency port. T... | 01/29/2008 |
