2FSK signal generation and detection circuit
A 2FSK, signal generation technology, applied in the direction of electrical components, digital transmission systems, modulated carrier systems, etc., can solve problems such as complex circuit structures, and achieve the effect of phase stability and smooth waveform transition
Inactive Publication Date: 2017-10-27
SHANGHAI DIANJI UNIV
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Problems solved by technology
[0004] The disadvantage of the frequency modulation method and the switching method is that an external frequency source is required, and the circuit structure is relatively complicated.
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[0018] In order to make the present invention more comprehensible, preferred embodiments are described in detail as follows.
[0019] like figure 1 As shown, it is a 2FSK signal generation and detection circuit provided by the present invention, which includes a modulation part and a demodulation part. The modulation part includes a voltage-frequency conversion circuit and a waveform conversion circuit. The function of the voltage-frequency conversion circuit is to convert the input baseband signal into a dual-frequency triangular wave signal. The voltage-frequency conversion circuit specifically includes an integrating circuit and a hysteresis comparator. After the baseband signal is input into the integrating circuit, a triangular wave is generated. The hysteresis comparator controls the integration time of the integration circuit through the feedback branch, so that the frequency of the output signal changes accordingly, that is, the dual-frequency rectangular wave signa...
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The invention relates to a 2FSK signal generation and detection circuit. The 2FSK signal generation and detection circuit is characterized by comprising a modulation part and a demodulation part, wherein the modulation part comprises a voltage-frequency conversion circuit and a waveform conversion circuit, wherein an input baseband signal is converted into a double-frequency triangular wave signal through the voltage-frequency conversion circuit; triangular wave-sine wave conversion of the double-frequency triangular wave signal is realized through the waveform conversion circuit; therefore, the double-frequency triangular wave signal is converted into a double-frequency sine wave signal, namely a 2FSK signal; and the demodulation part is used for realizing demodulation of the 2FSK signal. According to the 2FSK signal generation and detection circuit disclosed by the invention, the waveform conversion circuit is added into the voltage-frequency conversion circuit; therefore, on the premise that an additional frequency source does not exist, two sine waves in steady frequency are respectively generated corresponding to a baseband signal 1 and a baseband signal 0; the waveform transition is relatively smooth; furthermore, correct detection is realized through a phase-locked loop and a sampling judgment circuit; the phase is steady; and the 2FSK signal generation and detection circuit is relatively simple and practical.
Description
technical field [0001] The invention relates to a circuit for realizing the generation and detection of 2FSK signals. Background technique [0002] With the popularization of electronic computers, digital communication technology has developed rapidly. Digital frequency modulation is a common modulation method in digital communication. The frequency shift keying (FSK) method is simple and easy to implement, and demodulation does not need to restore the local carrier , can be transmitted asynchronously, has strong anti-noise and anti-fading performance, and is widely used in medium and low-speed data transmission. [0003] FSK uses changes in carrier frequency to transmit digital information. 2FSK means that the baseband signal "1" corresponds to the carrier frequency f 1 , the baseband signal "0" corresponds to another carrier frequency f 0 of the modulated waveform, and f 1 and f 0 The change between is done instantaneously. There are two main 2FSK modulation methods....
Claims
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IPC IPC(8): H04L27/12H04L27/16H04L27/14H04L27/152H04L27/156H03B28/00
Inventor 胡之惠宁小霞杨宇陈布雨
Owner SHANGHAI DIANJI UNIV