Matches 1 - 10 out of 10
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EP1057252B1 DIRECT DIGITAL SYNTHESIS OF PRECISE, STABLE ANGLE MODULATED RF SIGNAL  
7136626 Radio frequency modulator  
A transmitter architecture ( 200 ) provides for a stable and low noise modulator where the modulation bandwidth is uncorrelated to the TX loop bandwidth. The output signal ( 228 ) of the TX loop is...
7107030 Transmitter and a modulator therefor  
A transmitter for a portable radio communication apparatus comprising a modulator having first port for inputting a baseband signal and a second port for inputting a local oscillator signal, and...
5952895 Direct digital synthesis of precise, stable angle modulated RF signal  
The present invention, generally speaking, provides an RF modulator that allows precise, stable phase shifts to be obtained. The modulator uses a PLL structure including an auxiliary feedforward...
4947454 Radio with digitally controlled audio processor  
A mobile radio is disclosed which includes an integrated circuit audio processor which operates under the control of at least one microprocessor. The audio processor provides basic transmit/receive...
4905305 Method and apparatus for controlling the frequency of operation and at least one further variable operating parameter of a radio communications device  
The operating frequency of a radio transceiver and at least one further variable operating parameter of the radio transceiver are controlled in accordance with pre-stored information. Transmit...
4870699 Method and apparatus for controlling the frequency of operation and at least one further variable operating parameter of a radio communications device  
The operating frequency of a radio transceiver and at least one further variable operating parameter of the radio transceiver are controlled in accordance with pre-stored information. Transmit...
4610030 Frequency modulated transmitter applicable to MF broadcasting  
The invention concerns a frequency modulation broadcasting transmitter in which the output oscillator at the transmission frequency is modulated not directly by the audiofrequency signal but...
4573026 FM Modulator phase-locked loop with FM calibration  
Apparatus to provide calibrated frequency modulation (FM) of frequencies generated in a phase-locked loop is disclosed. A phase-locked loop (PLL) includes a voltage-controlled oscillator (VCO)...
4554517 Device for the automatic linearization of the control signal-frequency characteristic of a frequency-modulated variable frequency oscillator  
A phase lock loop having an instruction input to which is applied the output signal of the frequency-modulated variable frequency oscillator. The pass band of the loop is regulated in order to...
Matches 1 - 10 out of 10