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7082294 |
Self-adaptive frequency band-pass filtering device in microwave signal transceiver
The present invention relates to a self-adaptive band-pass filtering device in a microwave signal transmitter and/or receiver, the receiver being connected to a microwave signal receiving antenna...
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7075345 |
Frequency converter having low supply voltage
A frequency converter converts a first current signal having a first frequency into a second current signal having a second frequency different fro the first frequency. The frequency converter...
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7076229 |
Circuits with improved power supply rejection
Circuit comprising a noise suppressing circuitry ( 40 ) having an input ( 42 ) for a first voltage (VDD) and an output ( 43 ) for providing a supply voltage (VDDfiltered). The circuit further...
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7076231 |
Receiver apparatus controlling the power consumption according to the reception signal level
A receiver apparatus is provided with a receiver section including an amplifying stage for amplifying a high frequency signal received by an antenna, a frequency converting stage for converting a...
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7062247 |
Active double-balanced mixer
The present invention describes active double-balanced mixers. The mixers use an isolation and matching section that provides RF section input matching and superior isolation between the LO and RF...
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7058379 |
Orthogonal frequency division multiplexing transceiver and method of operating the same
For use in an orthogonal frequency division multiplexing (OFDM) transceiver, a multimode local oscillator circuit and a method of operating the same. In one embodiment, the circuit includes: ( 1 )...
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7054609 |
Linearity improvement of Gilbert mixers
Method and system are disclosed for providing an improved linearity Gilbert mixer. The Gilbert mixer of the present invention includes a conventional mixer core coupled to a high linearity,...
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7054608 |
Multilayer electronic component and communication apparatus and method
A multilayer electronic component has a multilayered product laminating a plurality of dielectric sheets as one piece,
a plurality of grounded electrodes provided among the dielectric sheets...
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7050779 |
Semiconductor integrated circuit device
The thermal interference due to the self heating of transistors constituting a gilbert cell circuit is reduced, thereby largely improving the receiving sensitivity to signals. A mixer circuit...
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7046980 |
Method and apparatus for up-and down-conversion of radio frequency (RF) signals
This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters and receivers. To solve this problem a virtual LO™ signal is...
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7042272 |
Transconductance amplifier with substantially constant resistance and mixer using same
A transconductance amplifier ( 620 ) includes four transistors each operating in saturation and strong inversion. A first transistor ( 622 ) has a first current electrode and a control electrode...
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7043220 |
Image-rejection mixer having high linearity and high gain
An integrated semiconductor image-rejection mixer having high linearity and high gain. In addition to the components of a classic image-rejection architecture, the present mixer has a...
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7039375 |
Up/down converter
The invention provides an up/down converter with low phase noise. Signals from a first local oscillator are fed through a power splitter to first and second mixers. Signals from a second local...
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7039129 |
Demodulator structure utilizing DC switches
The present invention relates to an I/Q demodulator ( 21 ) comprising a n-port structure ( 1,16 ) is provided, wherein n is an integer value of 4,5 or 6. The demodulator ( 21 ) is supplied at a...
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7035614 |
System and method for discovering frequency related spurs in a multi-conversion tuner
The present invention is directed to a system and method of reducing frequency interference in a circuit when the harmonics of at least two frequencies could cause interference when such harmonics...
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7035617 |
High power block upconverter
A system and method for high power block upconversion having a stand-alone and surface-mountable component is provided. The HP-BUC system of the invention provides a “drop-in” component capable...
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7035616 |
Two-stage variable-gain mixer employing shunt feedback
A demodulator which includes an active balun circuit and at least one mixer driven by the active balun circuit. The active balun circuit includes a negative shunt feedback arrangement.
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7031688 |
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...
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7030667 |
Frequency conversion circuit arrangement and mobile radio comprising said circuit arrangement
A frequency conversion circuit arrangement is disclosed providing a complex output signal at its output. The circuit comprises two frequency mixers that are driven, on the one hand, by an input...
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7031689 |
Differential radio
A cellphone handset may be excited in a completely differential mode. The antenna, e.g. a simple dipole or a minimal Yagi-Uda with a reflector, may be printed into the printed circuit board. A...
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7031668 |
Adaptive radio transceiver with a local oscillator
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7027794 |
Radio receiver and radio communication system
The cutoff frequency is set high in order to prevent suppression of low-frequency components so that high-quality reception control of a radio signal can be realized. A radio signal amplifier unit...
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7027833 |
Dual band superheterodyne receiver
A MMIC based superheterodyne receiver for converting at RF energy in an upper and a lower frequency band includes at least one attenuator for the RF energy input, a mixer for mixing the lower band...
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7024172 |
Direct conversion receiver using a dithered local oscillator to mitigate adjacent channel coherent interference
A direct conversion quadrature receiver and method are provided according to the invention. The receiver according to one embodiment includes a primary local oscillator (LO) that down-converts a...
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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 baseband...
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7016663 |
Applications of universal frequency translation
Frequency translation and applications of same are described herein. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal...
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7016664 |
Mixer circuit arrangement and an image-reject mixer circuit arrangement
A mixer circuit arrangement 30 comprises a complementary transconductor circuit 31 and a mixer stage 32 . The complementary transconductor circuit 31 includes two paths in parallel between a...
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7016662 |
Method and apparatus for up-conversion of radio frequency (RF) signals
This patent describes a method and system which overcomes the LO-leakage problem of direct conversion and similar RF transmitters. To solve this problem a virtual LO™ signal is generated within...
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7013122 |
Ultra high isolation mixer
A double balanced mixer for mixing an RF input signal with a local oscillator signal to provide at an output an intermediate frequency signal with high isolation over a wide frequency range. The...
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7010287 |
Quadrature signal generator with feedback type frequency doubler
Disclosed is a quadrature signal generator for generating an in-phase signal and a quadrature-phase signal, which is capable of generating a quadrature signal having the same frequency as a...
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7006814 |
Direct conversion receiver and transceiver
A receiver of the direct conversion system by which problems arising from interference between a reception signal and a local signal used by a quadrature demodulator on the reception side are...
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7006812 |
Intermediate frequency stage and signal processor used in digital portable telephone apparatus
A signal processing circuit in a digital portable telephone apparatus having a GPS function has a phase shifter for making an I signal and a Q signal obtained by demodulating a BPSK modulated...
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7006813 |
Efficient charge transfer using a switched capacitor resistor
The application of a non-zero voltage offset to rotating capacitors 1111 and 1112 permit the use of a single positive voltage supply. However, the precharging of the rotating capacitors 1111 ...
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7003271 |
Direct conversion receiver having a gain-setting dependent filter parameter
In a direct conversion radio frequency receiver, an automatic gain control is implemented that allows changing the operation mode of a filter unit in the baseband section of the receiver such that...
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7003275 |
Agile frequency converter for multichannel systems using IF-RF level exhange and tunable filters
Agile frequency converter and method, IF-RF level exchange process, and notch filtering techniques. System noise and spurious levels generated by channel frequency conversion is reduced in...
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7003276 |
Subsampling communication receiver architecture with gain control and RSSI generation
A first periodic voltage waveform ( 20 ) is downconverted into a second periodic voltage waveform ( 35, 36 ). A plurality of temporally distinct samples (SA 1 , SA 2 , . . . ) respectively...
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6999744 |
Measurement of local oscillation leakage in a radio frequency integrated circuit
The measuring of local oscillation leakage in radio frequency integrated circuits (RFICs) begins by concurrently enabling a transmitter portion and a receiver portion of a radio frequency...
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6999746 |
Image rejection mixer
An image rejection mixer of reduced power dissipation includes a signal distributor supplied with local signals having a phase difference to distribute the local signals, a first and a second...
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6999745 |
Mixer with a variable gain current-to-voltage converter
A receiver comprising an input for receiving a first signal, said receiver further comprising a local oscillator for generating a periodical signal. The receiver further comprises a mixer for...
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6993311 |
Radio receiver having an adaptive equalizer and method therefor
A radio receiver ( 100 ) has an equalizer ( 500 ) that operates in the time domain to remove residual interference that is not removed by an IF filter ( 200 ) operating in the frequency domain that...
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6993312 |
Double balanced diode mixer with high output third order intercept point
A double balanced mixer consisting of an RF balun, a local oscillator balun and a diode “quad” bridge circuit connected between the two baluns and where the IF output is taken at the center tap...
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6990326 |
Image suppression filter circuit
An image suppression filter circuit comprises a first phase shifter outputting a first output signal and a second output signal substantially orthogonal thereto, a second phase shifter outputting a...
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6987966 |
Adaptive radio transceiver with polyphase calibration
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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6987434 |
Non-radiative dielectric waveguide modulator having waveguide type hybrid coupler
A non-radiative dielectric (NRD) waveguide modulator is provided having a waveguide type hybrid coupler, in which by forming a waveguide type 180° hybrid coupler and waveguide as a single body,...
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6985710 |
Image rejection mixer for broadband signal reception
An image rejection mixer includes an input terminal for receiving an input radio frequency (RF) signal, a mode selector coupled to the input terminal generating an output signal for either high...
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6985706 |
Feed forward amplifier system employing self-generating alignment lists and adaptive controller
A method and apparatus for rapid alignment of adaptive feed forward power amplifiers are disclosed. Successful alignment settings are correlated with the operating conditions that affect the gain...
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6980779 |
RF transmitter using digital-to-RF conversion
An RF transmitter having two digital to RF-conversion devices that combine the D/A conversion function and the upconversion function by a RF-carrier or IF-signal. The device comprises a plurality...
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6975838 |
Adaptive radio transceiver with noise suppression
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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6970687 |
Mixer
The invention provides a mixer comprising a multiplier circuit having a first and a second mixer, a generator for generating two first and two second control signals for controlling the first and...
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6970688 |
Local oscillator signal divider and low-noise converter employing the same
A rat race circuit has an annular transmission line formed on a microstrip dielectric substrate. A terminal for port 1 is formed at any given position of the annular transmission line. Respective...
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