Wireless RF transmitter and controller
A transmitter controller, radio frequency technology, applied in the direction of FM carrier system, etc., can solve the problems of timidity, mixer or phase-locked loop expensive special analog radio frequency integrated circuit, increased possibility, etc.
Inactive Publication Date: 2006-11-15
HOLTEK SEMICON
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As shown in the figure, it selects the low-frequency digital information to be transmitted, digital logic "0" and "1", through the frequency switching selection circuit 31 to select different frequency outputs, and then transmits it through the RF power amplifier 32 and the LC transmitting antenna 33 , which increases the possibility of integrating the overall structure on a single integrated circuit. However, it needs to use at least two or more different high-frequency oscillation signal sources for supply. The mutual interference and dependence between the two high-frequency signal sources increases its application design. the complexity of
[0008] Considering the overall system cost, mixers or phase-locked loops require more expensive special analog radio frequency integrated circuits, or require some special discrete components and application-specific considerations, which are often daunting
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[0054] see Figure 4 , which is a structural diagram of a FSK modulation circuit in a preferred embodiment of the present invention, the FSK modulation circuit includes a crystal oscillator 41, an N-type metal oxide semiconductor transistor 42, a modulation capacitor Cx, and a radio frequency power amplifier 44 , and an LC transmitting antenna 45 . As shown in the figure, the present invention utilizes a traditional crystal oscillator 41 to cooperate with an inverting circuit INV, a feedback resistor R, and voltage stabilizing capacitors C1 and C2 to provide a stable first oscillation frequency output. If the capacitance of C2 is changed, the output of the first oscillation frequency will be changed directly. Therefore, the present invention utilizes the N-type metal-oxide-semiconductor transistor 42 of CMOS process to connect the modulation capacitor Cx to the output terminal OSC2 of the crystal oscillator 41. The connection point with the input terminal of the RF power ampl...
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The invention provides a wireless radio frequency transmitting device and controller. And the wireless radio frequency transmitter comprises an oscillator (OSC) for providing a stable oscillation frequency; a modulation capacitor, connected in series with output or input end of the oscillator to modulate the oscillation frequency; a transistor, connected between the modulation capacitor and a ground end to be switched on or off under the control of a digital data; and a radio frequency power amplifier, connected to the oscillator to receive the oscillation frequency and generate an energy according to the set transmission power requirement; and a transmitting aerial, connected to the radio frequency power amplifier to receive the energy and transmit a modulation carrier signal. And it not only provides a simple and easy wireless radio frequency FSK transmitting device and controller, able to largely reduce complexity of FSK digital modulation system and largely reduce the whole cost.
Description
technical field [0001] The invention relates to a wireless radio frequency transmitting device and a controller, in particular to a wireless radio frequency frequency shift button method transmitting device and a controller. Background technique [0002] The frequency modulation method of the known communication system, either uses the analog frequency modulation (frequency modulation, FM) mode, or the frequency-shift keying method (frequency-shift keying, FSK) mode, its principle is to use the output frequency of modulation change as information In the way of transmission, the audio signal is modulated to a high-frequency carrier and transmitted through the antenna. [0003] The known FSK communication modulation method still uses the traditional analog frequency modulation (FM) communication transmission architecture, which only changes the input analog audio signal into digital logic data, and its modulation transmitter still uses the traditional analog FM communication t...
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IPC IPC(8): H04L27/12
Inventor 许绩贺
Owner HOLTEK SEMICON