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8699985 Frequency generator including direct digital synthesizer and signal processor including the same  
A signal processor includes a frequency generator that employs a direct digital synthesizer (DDS) to generate a first local oscillator (LO) signal with a variable first LO frequency. The signal...
8688067 Sampling circuit and receiver using same  
A sampling circuit and a receiver are provided having a high flexibility of filter design and excellent characteristics for removing an interfering wave. Provided also are a sampling circuit and a...
8594607 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. Such methods, systems, and apparatuses operate by receiving an...
8581112 Coupler apparatus  
According to one embodiment, a coupler apparatus includes a coupling element and a ground plane. The coupling element comprises a conductive material and configured to be subjected to power...
8570100 Direct sampling circuit and receiver  
A sampling circuit and a receiver, with relatively simple configurations, and clocks, exhibiting excellent frequency characteristics, are provided. In discrete time circuits, a charging switch is...
8494474 Dual band diode mixer for RF data receiver  
In one preferred embodiment, the data receiver includes an input matching circuit for receiving an input RF data and forming an impedance matched signal and an amplifier circuit responsive to the...
8483628 Multiple-phase frequency translated filter  
A frequency translation filter includes a baseband filter circuit, a clock generator, and a switching circuit. The baseband filter circuit is operable to provide a baseband filter response. The...
8457551 Communication device, communication system, and communication method  
There is provided a communication device including: a high frequency coupler; a band-pass filter; a switching mechanism that switches an electrical length a transmission line between the high...
8351867 Oscillator, frequency generating circuit and wireless communication system using the oscillator  
The present invention provides an oscillator and a communication system using the oscillator, in particular, an LC oscillator adapted to lessen phase noise deterioration due to harmonic...
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...
8315576 Capacitive compensation of cascaded directional couplers  
A cascaded directional couplers circuit having capacitive compensation such that the directivity of a resistively terminated one of the cascaded couplers is not degraded by an inductance of the...
8315586 Signal receiving device and signal receiving method using same, and signal supplying unit and signal supplying method using same  
A signal receiving device is provided which can prevent the imbalance occurring between in-phase and quadrature signals. A polarity of a local oscillator output signal to be outputted from a local...
8190116 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...
8139685 Systems, methods, and apparatus for frequency control  
A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The...
8134421 Voltage control oscillator and quadrature modulator  
A voltage control oscillator includes: first and second field effect transistors, a drain of one of which is connected to a gate of the other and a drain of the other of which is connected to a...
8107914 RF filter with low-IF mixing, tuning and calibration  
Radio-frequency (RF) circuits, methods and systems are implemented according to a variety of embodiments. According to one such embodiment, a radio-frequency (RF) receiver circuit is implemented...
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,...
7937059 Converting an electromagnetic signal via sub-sampling  
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...
7903762 Multi-band TV tuner and method thereof  
A direct conversion multi-band TV tuner includes: a plurality of RF (radio frequency) paths for processing the RF signal and for generating a plurality of processed RF signals, respectively; and a...
7899409 Apparatus for controlling impedance  
A transceiver is described that includes a power amplifier (PA), a low noise amplifier (LNA), and an impedance matching circuit having a first and second differential output node. The first and...
7890076 Mixer circuit and method  
A method of providing an input signal to a mixer circuit comprises coupling an output signal from a low-noise amplifier circuit to a mixer input of the mixer circuit via an AC coupling circuit,...
7853208 Communication system and communication apparatus  
A communication system, including a transmitter having a transmitting circuit unit to generate a data transmission-adaptive RF signal and an electric-field-coupling antenna to send out the RF...
7817966 Switching device with reduced intermodulation distortion  
According to one exemplary embodiment, a switching device with phase selection terminals to select between at least two phase shifting modes to reduce intermodulation distortion in the switching...
7738841 Systems, methods and apparatuses for high power complementary metal oxide semiconductor (CMOS) antenna switches using body switching and external component in multi-stacking structure  
Embodiments of the invention may provide for a CMOS antenna switch, which may be referred to as a CMOS SPDT switch. The CMOS antenna switch may operate at a plurality of frequencies, perhaps...
7711347 Mixer  
Provided is a mixer including: an amplifier amplifying an input signal using at least one amplifier element; a mixing unit mixing the input signal amplified by the amplifier with a local...
7627295 Downconverter and upconverter  
A downconverter and upconverter are provided which can obtain a sufficient image rejection ratio in a low-Intermediate Frequency (IF) scheme while reducing power consumption and can suppress Error...
7623838 Sampling mixer with asynchronous clock and signal domains  
A mixer 1100 with a plurality of signal paths typically requires separate clock generating hardware for each signal path. However, the redundancy of having multiple clock generating hardware...
7603099 Direct-conversion receiver system and method with quadrature balancing and DC offset removal  
A system and method are provided for direct-conversion of a modulated radio-frequency (RF) signal. After receiving an RF signal, the RF signal is mixed with a plurality of oscillator signals with...
7580693 Passive reflection mixer  
In one aspect, a mixer that provides improved isolation between an input oscillator and a mixing cell. In another aspect, a mixer that includes circuitry operative to shape an input signal...
7541966 Apparatus and method for demodulating a modulated signal  
An apparatus for demodulating a modulated signal comprises an analog to digital converter (2, 12) for converting an analog modulated input signal to a digital signal. The analog to digital...
7403751 DC offset calibration system  
A division ratio of a first frequency divider that generates a local signal and a division ratio of a second frequency divider that generates a RF interfering signal are different, and a first...
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...
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...
7254380 Low flicker noise current-folded mixer  
The current-folded mixer of this invention comprises an input stage and a switching stage. The input stage receives a radio frequency input RF and generates a modulated bias current to the...
7206565 Device for generating wide tunable frequency using frequency divider  
The present invention relate to a wideband frequency generating apparatus using a frequency dividing method of dividing a frequency signal of a voltage control oscillator to expand a frequency...
7167698 Balanced sub-harmonic mixer  
A wide band mixer is provided that mitigates local oscillator leakage. A LO signal is provided to a 180 degree splitter that provides a first intermediate LO signal and a second intermediate LO...
7164329 Tunable phase shifer with a control signal generator responsive to DC offset in a mixed signal  
The present invention provides a phase shifting filter and a phase compensating direct downconversion receiver. A DC offset detector detects a DC offset in a received baseband signal and provides...
7146149 High isolation switch buffer for frequency hopping radios  
A local oscillator (LO) circuit is disclosed which provides improved isolation between the unselected LO source and a mixer. The LO circuit includes a first LO source to generate a first periodic...
7130607 Adjusting a programmable mixer  
A method for adjusting a programmable mixer of a local oscillation module to reduce local oscillation leakage begins by determining at least one of: DC offset of an input signal of the...
7107025 High gain, highly linear mixer  
A high gain, highly linear mixer includes an input section, mixing section, at least one tuning component, and at least one stand by current source. The input section is operably coupled to...
7085549 Dynamic power sharing zero intermediate frequency (ZIF) mixer and method of forming same  
A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer (200) includes a low noise amplifier (LNA) (203), a first RF mixer stage (205) for mixing an RF signal from the at least one...
7031748 Radio signal receiving apparatus and demodulating circuit  
The object of this invention is to demodulate received signals having different received signal frequencies with the simple circuit configuration. With the present invention, the fixed frequency...
7020451 Wideband multi-protocol wireless radio transceiver system  
A wideband radio transceiver system that features a wideband RF section and a flexible and scalable baseband signal processing section. The transceiver system architecture has configurable...
6952572 Image rejection mixer with switchable high or low side injection  
An image rejection mixer includes first and second mixers, a phase shift circuit and a summer. The first mixer receives an RF input signal and a first local oscillator (LO) signal and generates a...
6892061 Mixer circuit configuration  
A circuit configuration for mixing a differential desired signal with a differential local oscillator signal includes two difference amplifiers which are controllable on the input side by the...
6871056 Non-radiative dielectric waveguide mixer using a ring hybrid coupler  
Disclosed is a NRD waveguide mixer adopting a ring hybrid coupler applicable to a small-sized and high functional millimeter wave receiving/transmitting device. The NRD waveguide has a housing...
6871059 Passive balun FET mixer  
A FET mixer uses a balun having a primary and secondary, with the primary coupled to an radio frequency signal input. The mixer also includes a pair of field effect transistors (FETs), wherein the...
6836650 Methods and systems for down-converting electromagnetic signals, and applications thereof  
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...
6826393 Mixer circuit having component for frequency conversion  
A mixer circuit according to the present invention includes a first differential transistor pair of two transistors, a second differential transistor pair of two transistors, an impedance element...
6810240 Analog multiplier  
The analog multiplier has a MOS input stage. This makes it possible to increase the linearity range of the multiplier. In a development, a cascode circuit having an additional pair of bipolar...
Matches 1 - 50 out of 169 1 2 3 4 >