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8185067 |
Modulation method and apparatus
A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty...
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8019310 |
Local oscillator buffer and mixer having adjustable size
Selectable sizes for a local oscillator (LO) buffer and mixer are disclosed. In an embodiment, LO buffer and/or mixer size may be increased when a receiver operates in a high gain mode, while LO...
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7929929 |
Method and apparatus for spur reduction in a frequency synthesizer
A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that...
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7925232 |
Reduced cost mobile satellite antenna system using a plurality of satellite transponders
A system for utilizing circular polarized signals to perform satellite communication to mobile users. The satellite includes transponders, each transponder providing linearly polarized signals and...
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7904036 |
Modulation method and apparatus
A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty...
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7894778 |
LO generator to reject unwanted sideband
According to an example embodiment, an apparatus is provided in a wireless transceiver. The apparatus may include a circuit configured to generate a first frequency signal (e.g., a VCO signal). A...
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7877070 |
Method and system for tuning an antenna using injection
Certain aspects of a method and system for tuning an antenna using injection may include mixing a received DVB-H signal with a reference oscillator signal to generate an added DVB-H signal. A mixed...
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7805123 |
RF transceiver using hopping frequency synthesizer
A technique of frequency hopping communication capable of high-speed switching of a plurality of signals having ultra-wide band 528 MHz bandwidth at high-speed and setting and switching a band...
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7801505 |
Multipulse/multitone mixing receiver
An apparatus adapted for measuring the properties of periodic signals and a method for making such measurements is disclosed. The apparatus includes a LO signal generator, a mixer, a low pass...
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7796964 |
Intermediate-frequency type radio signal receiver
A radio signal receiver includes an input for receiving an input signal having an input carrier frequency modulated by a payload signal to be detected. A frequency converter changes the carrier...
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RE41583 |
Frequency-stabilized transceiver configuration
A transceiver configuration has an integrated circuit (IC) with an A/D and/or D/A converter, a VCO with a reference oscillator, which provides a sampling clock for the A/D and/or D/A converter, and...
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7756496 |
Oscillation controlling apparatus, recording medium having program recorded thereon, and channel selecting apparatus
An oscillation controlling apparatus for controlling an oscillation frequency of an oscillation circuit to be a target frequency comprises a variable range dividing unit configured to dividing a...
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7702052 |
Radio-frequency receiver and integrated circuit employed for the receiver
Radio-frequency receiver contains a plurality of oscillation circuits that generates an oscillation frequency higher than that of digital broadcasting signals, selective switching circuit that...
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7639821 |
System and method for improved detection of AM signals
A software defined radio detects an amplitude modulated (AM) signal contained within a received signal. This detection involves first receiving a radio frequency (RF) signal that contains the AM...
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7634242 |
Systems and methods for filter center frequency location
A system for implementing a tuner comprising a Radio Frequency (RF) circuit, a filter disposed in a signal path in said RF circuit, a first negative resistance unit in communication with said...
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7605838 |
Broadcast signal receiving apparatus and method of filtering noise signals
Broadcast signal-receiving apparatus and a method filtering noise signals. The broadcast signal-receiving apparatus includes a tuner to convert an RF signal to a lower frequency signal to output an...
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7580390 |
Reducing handover frequency error
Frequency estimation information obtained when a wireless communication device (WCD) is in one wireless communication system, such as frequency error or offset information, may be translated to a...
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7577417 |
Mobile terminal
There is provided a cellular phone taking into consideration enhancement in processing speed and reduction in current consumption, and the cellular phone comprises a processing unit capable of...
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7567786 |
High-dynamic-range ultra wide band transceiver
An UWB Transceiver for Multi-Band OFDM communication including an antenna switch (342), a receive front end and down-converter (303), an up-converter and power amplifier (305), and a frequency...
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7558548 |
Method and apparatus for receiving and/or down converting high frequency signals in multi mode/ multi band applications, using mixer and sampler
A method and apparatus to receive and down convert high frequency radio signals to low frequency or base band frequency is disclosed. A mixer used with a sampler produces a multi mode/multi band...
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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...
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7418248 |
Signal reception device, signal transmission device, radio communication system, and signal reception method
A signal reception device is disclosed that is able to improve interference cancellation capabilities even when signals having different center frequencies exist on the same frequency band. The...
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7406301 |
Modulation-demodulation apparatus and wireless communication apparatus
A modulation-demodulation apparatus of a relatively simple arrangement is able to prevent a bad influence caused due to interference between two local oscillators and a portable wireless...
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7379722 |
Frequency allocation using a single VCO
An apparatus and method to use a single voltage controlled oscillator (VCO) to generate frequencies to cover multiple frequency bands. The single VCO generates local oscillator signals for more...
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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...
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7263339 |
Tuner comprising a voltage converter
The invention relates to a tuner for converting a radio frequency signal into an intermediate frequency signal, said tuner comprising a voltage converter supplying a control signal, a mixer...
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7251298 |
Receiver architecture eliminating static and dynamic DC offset errors
The present invention provides a receiver frontend that eliminates static and dynamic DC errors and has improved second order intermodulation distortion (IMD2) performance. The receiver frontend...
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7242259 |
Active backscatter transponder, communication system comprising the same and method for transmitting data by way of such an active backscatter transponder
The invention relates to a device, especially an active backscatter transponder, for generating an oscillator signal based on a base signal. It comprises an oscillator for actively constructing the...
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7203475 |
Multiple rate local oscillation generator and applications thereof
A local oscillation generator includes a clock circuit, a first divide module, a first mixing module, a second divide module, and a second mixing module. The clock circuit is operably coupled to...
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7155183 |
Method and apparatus for adjusting reference oscillator frequency in a mobile wireless device
A method and apparatus for using a conventional oscillator in a cellular telephone transceiver as a source of a reference signal for a GPS receiver. In one embodiment, the method comprises using a...
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7123892 |
Architecture for an AM/FM digital intermediate frequency radio
An AM/FM DIF radio has an IF to audio converter that provides an audio signal from an IF signal responsive to a clock signal. During the processing of the IF signal, a spurious signal is...
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7046960 |
Relay apparatus
While a spectrum waveform of an output signal from a subtracter (207) is visibly monitored, an operator controls a variable phases shifter (208) based upon a second control signal (CL2) so that a...
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7043211 |
Universal modulator
A modulator generates a combined signal consisting of audio and video signals and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and...
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7019790 |
Integrated tuner circuit and television tuner using an integrated tuner circuit
An integrated tuner circuit includes a first terminal to which a UHF TV signal is input via a UHF amplifier. The amplifier is switched to an operating state when a UHF TV signal is received. A...
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7003273 |
Temperature compensating circuit, electronic apparatus and radio unit having temperature compensating function
A temperature compensating circuit is provided in a radio unit, an ambient temperature is detected by a temperature sensor of the temperature compensating circuit, the detected temperature value is...
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6950639 |
Local oscillator for generating an HF signal for direct mixing by using avalanche photodiodes
A local oscillator for use in an optoelectronic distance measurement system for generating a narrow-band HF signal for direct signal mixing with a reception signal generated by an avalanche...
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6920316 |
High performance integrated circuit regulator with substrate transient suppression
A regulation circuit, incorporated in a single integrated circuit with a first circuit load, which as an input coupled to a power supply which produces a source voltage, and a first output coupled...
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6901248 |
Frequency converter and radio frequency tuner
A single conversion frequency converter comprises an image reject mixer and a local oscillator. The local oscillator comprises a variable frequency oscillator and a variable divider. The variable...
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6885254 |
Calibration device and method for generating a clock in an integrated circuit
To generate an accurate frequency standard in an integrated circuit, it is proposed to activate a reference oscillator at certain time intervals and to calibrate the local oscillator. For this...
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6847812 |
Frequency-stabilized transceiver configuration
A transceiver configuration has an integrated circuit (IC) with an A/D and/or D/A converter, a VCO with a reference oscillator, which provides a sampling clock for the A/D and/or D/A converter, and...
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6757527 |
Method and apparatus for synchronizing a local reference frequency in a communication systems
A method for synchronizing a local reference frequency in a mobile station includes measuring a current ambient condition of the mobile station and using stored data indicating variance of the...
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6735425 |
Telephone with a demodulator circuit with an improved local oscillator
To address the problem of aging and drift of a local oscillator in a mobile telephone the frequency Fi of the local oscillator is shifted upwards so that base station logging-on FCH signals are...
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6728523 |
Method and apparatus for stabilizing frequency of output signal of relay station in radio communication system
A method of stabilizing frequency of an output signal of a data-relay apparatus provided in a radio communication system that includes a relay station and a radio terminal device, wherein the...
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6566953 |
High-frequency amplifier circuit for UHF television tuner having less distortion
A high-frequency amplifier circuit for a UHF television tuner includes an FET having a first gate for inputting a UHF band television signal and a second gate for applying an AGC voltage which...
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6483552 |
Television tuner
This television tuner comprises a mixer 1c for frequency converting each of a television signal and an FM broadcasting signal into an intermediate signal, a local oscillator for outputting a local...
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6477182 |
Data transmission method and apparatus
A method and apparatus for modulating a plurality of information signals onto respective unique intermediate frequency (IF) carrier signals, summing the respective IF carrier signals to provide a...
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6463266 |
Radio frequency control for communications systems
The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with...
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6445908 |
Dynamic temperature compensation and stage selection in pilot signal acquisition
A method and apparatus for dynamic temperature compensation and pilot stage searcher selection in a mobile unit of a CDMA wireless communication link. Temperature values and measured pilot...
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6370368 |
Global tuner
A tuner including an oscillator, a divider means for dividing the oscillator signal and a mixer, suitable for global tuner applications, i.e. U.S.A./Europe/Japan without any hardware change, the...
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6359940 |
Method and apparatus for downconverting signals transmitted using a plurality of modulation formats to a common intermediate frequency range
A receiver that downconverts input signals modulated using first, second, third and fourth modulation formats to a common intermediate frequency range. The first and second modulation formats are...
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