Matches 351 - 400 out of 532 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
6539215 Down converter and demodulator using a three port junction  
A down converter for RF signals comprises one three port junction ( 7 ) having one input port six for modulated digital RF signals and two output ports ( 8, 9 ). The output ports ( 8, 9 ) are...
6529719 Image reject mixer  
To overcome problems in an image reject mixer in a radio frequency receiver when there is a degradation in image rejection due to process variations, such as variations in the values of components,...
6529721 Low-noise mixer and method  
A mixer circuit for downconverting a radio frequency signal to a lower (intermediate) frequency signal or upconverting an intermediate frequency signal to a radio frequency signal. The mixer...
6510314 Mixer circuit with output stage for implementation on integrated circuit  
An output stage of a double balanced mixer having a first intermediate port and a second intermediate port includes an operational amplifier, an impedance and first and second current source...
6510313 Wireless communication device  
A low cost wireless multi-band communications device automatically adapts itself to a signal received from a particular system. On the basis of a bandwidth determination of the received signal, a...
6477360 Frequency converter  
A frequency converter includes a multiplying circuit, a load circuit, and an output buffer circuit. The multiplying circuit is arranged to multiply an RF signal and an LO signal and output a...
6466770 BALUN circuit for combining differential power amplifier outputs  
A BALUN circuit comprising a lead network coupled to the positive phase output of a differential power amplifier, a negative phase output coupled to the negative phase output of the differential...
6438364 Radio frequency device with fast charging of an input capacitance  
A radio frequency device has an input transistor from which a capacitance is seen, and a fast charging circuit for charging the capacitance. The input transistor receives a radio frequency signal....
6438365 Balanced mixer with feedback pre-amplifier  
An improved balanced mixer is provided for use in radio communication devices. The improved balanced mixer comprises a known Gilbert type mixer, a transconductance amplifier, a signal splitter, and...
6433630 Phase shifter, and demodulator employing it  
In a demodulator, a local oscillator 7 feeds a local oscillation signal having a frequency of f/n to a phase shifter 8 . In the phase shifter 8 , all-pass filters 9 and 10 produce two...
6433647 Low noise I-Q mixer  
A low-noise quadrature phase I-Q modulator having a pair of Gilbert cell input stages driven by a feed voltage line and receiving in input respective square wave command signals coming from a local...
6424074 Method and apparatus for upconverting and filtering an information signal utilizing a vibrating micromechanical device  
Several MEMS-based architectures which utilize vibrating micromechanical resonators in circuits to implement filtering, mixing, frequency reference and amplifying functions are provided. A method...
6397044 Transceiver  
A transceiver for a portable radio communication apparatus comprising a receiver for receiving a signal at a received frequency and including a local oscillator, a transmitter being operable to...
6392592 Hand held car locator  
A car locator system includes a hand held locator which receives information with regard to the location of a vehicle and then stores that information for display on the hand held locator. The hand...
6393266 Preprocessor and related frequency translator  
A direct conversion receiver comprising a preprocessor coupled to a frequency translator which, in one implementation, is a modified Gilbert mixer. In one embodiment, the preprocessor imparts...
6393260 Method for attenuating spurious signals and receiver  
The invention relates to a method and radio receiver for attenuating spurious signals when receiving ( 6 to 12 ) radio signals, when radio signals are mixed ( 10 ) to a second frequency, which...
6381449 Frequency converter  
A frequency converter including a mixer circuit which inputs a local oscillation signal and a radio-frequency input signal modulated for communication of information, and performs frequency...
6373345 Modulator structure for a transmitter and a mobile station  
A modulator having a high signal-to-noise ratio. The modulator comprises a switching arrangement and a driver arrangement coupled to the switching arrangement, said driver arrangement comprising...
6373883 Radio receiver and a radio transmitter  
A radio receiver is adapted to receive radio signals in at least two frequency bands, in which the radio signals are modulated by information signals. The radio receiver includes a device for...
6370371 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...
6370372 Subharmonic mixer circuit and method  
A subharmonic mixer that has two switching stages is used to improved mixer gain in a direct downconversion receiver. The first switching stage mixes a received RF signal to an intermediate...
6356746 Direct converting receiver  
Signal levels of received signals are detected within a plurality of different frequency bands by a first electric field strength detecting means 15 and a second electric field strength detecting...
6356748 Spectrum control for direct conversion radio frequency reception  
A method and apparatus for passband communication using direct conversion avoids 1/f and DC-offset noises by shaping the spectrum of the signal so that it has little energy near zero frequency....
6337976 Selective-calling radio receiver using direct conversion method  
A selective-calling radio receiver using the direct conversion method is provided, which commonly uses a VCO and its neighboring component for different frequency bands. This receiver is comprised...
6321076 90° phase shifter and image rejection mixer  
A phase shift circuit includes a first phase shifter, second phase shifter, and adder. The first phase shifter receives an input signal and obtains first and second intermediate phase shift signals...
6308058 Image reject mixer  
Circuit 200 comprises an input amplifier stage 290, phase-splitters 292, 293 and mixer cores 294, 295. An input signal is applied to terminal 220, a local oscillator signal applied to terminals...
6298227 Method and apparatus for frequency conversion for a receiver with a limited-accuracy oscillator  
A frequency converter that converts a signal at a radio frequency to an intermediate frequency using a limited-accuracy local oscillator. The frequency converter is configured to receive an analog...
6282413 Multistaged frequency conversion with single local oscillator  
A frequency conversion circuit has a first frequency conversion stage with a first mixer, a second conversion stage with a second mixer, an oscillator, a first frequency divider, and a second...
6282414 Wireless selective call receiving apparatus which can reduce current consumption and wireless selective call receiving method  
A wireless selective call receiving apparatus includes a mixer section, a detecting section and a control section. The mixer section converts a frequency of a received signal. The detecting section...
6275689 Double-balanced mixer  
The double-balanced mixer includes a diode ring (D1, D2, D3, D4) with respective balancing circuit portions for a local oscillator signal (LO) and a high frequency signal (RF) and a...
6275687 Apparatus and method for implementing a low-noise amplifier and mixer  
Disclosed is an apparatus for modifying a radio frequency signal. In one embodiment, the apparatus includes a mixer, an amplifier module and an interface circuit. The mixer is configured to receive...
6252472 Modulator having little parasitic coupling  
The present invention relates to a modulator comprising an oscillator which has an oscillation frequency, and a mixer intended to supply a modulated signal with a given output frequency. According...
6236690 Direct-conversion receiver for digital-modulation signal  
A direct-conversion receiver includes a local oscillator for generating a local oscillator signal, a converter circuit for converting a received radio signal into a pair of a baseband I signal and...
6233444 Radio receiving method and radio receiving apparatus  
A radio receiving apparatus has a receiving section for receiving a radio signal, a local oscillating section for generating a first local oscillation signal and a second local oscillation signal,...
6230000 Product detector and method therefor  
A product detector for converting a signal to baseband includes a commutating switch which serves to sample an RF waveform four times per period at the RF frequency. The samples are integrated over...
6219536 Mixer circuit  
To provide an analog mixer circuit operating with low power consumption and without needing any BEF for isolating two input signals, an LO signal and an IF signal are supplied to bases of a first...
6219535 Semiconductor amplifier and frequency converter  
A semiconductor circuit includes at least first and second field effect transistors. A source electrode of the first field effect transistor is connected to a drain electrode of the second field...
6212369 Merged variable gain mixers  
The present invention teaches parallel coupling what are herein termed a "switching stage" and a "steering stage," thereby arranging the mixer and variable gain amplifier circuitry as a single...
6205325 Active radio frequency mixer circuit with feedback  
An active mixer circuit, and an associated method, includes a feedback element which increases the linearity of the mixer circuit so that the mixer circuit is operable over a wider dynamic range...
6205324 Broadband double-balanced frequency mixer  
The invention provides a broadband double-balanced mixer capable of operating across a range of frequencies from millimeter to microwave. The mixer includes a Wilkinson type splitter.
6195539 Method and apparatus for rejecting image signals in a receiver  
In one embodiment, an apparatus comprising a mixing network coupled to a summing stage is presented. The mixing network is operative to receive a signal and process the received signal along a...
6178319 Microwave mixing circuit and down-converter  
A microwave mixing circuitry has a plurality of microwave signal input terminals, a local oscillator for outputting a local oscillation signal for the purpose of generating an intermediate...
6175728 Direct conversion receiver capable of canceling DC offset voltages  
A direct conversion receiver comprising mixers for mixing a received radio frequency signal and a local oscillation signal in frequency, a signal processing unit for converting the output signal of...
6163689 Negative self-bias circuit for FET mixers  
An improved mixing circuit includes a MESFET having an LO signal coupled to its gate through a charging capacitor and an RF signal coupled to its drain through a first bandpass filter. Electrons...
6160425 Frequency converter  
A frequency converter has both an up-conversion and a down-conversion circuit in a compact circuit design. The converter is operated as an upconverter by activating a first control FET, and is...
6157822 Tuned low power/low noise mixer  
A tuned low noise mixer (200) for use in radio frequency (RF) communications includes a transconductance amplifier (203) for amplifying an RF input signal (201). An impedance matching network (207)...
6154641 Wideband multiple channel frequency converter  
A wideband multiple channel frequency converter includes a mixer, a frequency generator for generating a local oscillator signal, a power divider for receiving the local oscillator signal and...
6144846 Frequency translation circuit and method of translating  
A frequency translation circuit (10) translates an incoming reference signal (RF IN ) to a lower frequency using a compound mixer circuit (42). The compound mixer circuit (42) has a first mixer...
6133795 Oscillator circuit  
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a...
6127962 Image rejection mixer  
There is provided an image rejection mixer for downconversion of an incoming signal to a lower intermediate frequency signal, using the absolute difference of frequencies between the incoming...
Matches 351 - 400 out of 532 < 1 2 3 4 5 6 7 8 9 10 11 >