Frequency-adjustable Internet of Things terminal

Abstract

The invention discloses a frequency-adjustable Internet of Things terminal, which comprises a signal receiving module and a frequency modulation buffer module, wherein the signal receiving module is used for receiving an output signal of a signal receiver in the frequency-adjustable Internet of Things terminal; the signal receiving module is connected with an input port of the frequency modulationbuffer module through an operational amplifier AR1; the frequency modulation buffer module uses an inductor L4 to filter out high-frequency signal components, and uses a capacitor C1 and a capacitorC2 to filter out low-frequency components of signals; a triode Q1 plays a role in amplifying the signal current; a source signal is used for replacing a reference signal in the prior art for frequencymodulation; voltage division is carried out by using a resistor R3; a triode Q3 and a capacitor C4 are used to form a time-delay circuit to synchronize frequency modulation circuit output signals; and the frequency modulation circuit output signals are input into a frequency modulation circuit composed of a triode Q4, a triode Q5 and a variable resistor RW1 to modulate the frequency of signals, and an output port of the frequency modulation buffer module is connected with a frequency-adjustable Internet of Things terminal controller. Therefore, the effect of active frequency modulation calibration of output signals of an Internet of Things terminal signal receiver is achieved.

Description

technical field [0001] The invention relates to the technical field of the Internet of Things, in particular to an adjustable-frequency Internet of Things terminal. Background technique [0002] At present, the Internet of Things terminal is a device that connects the sensor network layer and the transmission network layer in the Internet of Things to collect data and send data to the network layer. When receiving data, the Internet of Things terminal needs to modulate the signal frequency to ensure the stability of the signal frequency. In order to achieve the accuracy of data transmission in the Internet of Things, however, the existing frequency modulation circuit only uses the reference signal or PWM signal to fuse and adjust the frequency with the signal to be frequency modulated. Since the reference signal or PWM signal is an external signal, the external signal and the source signal need to be matched. The frequency modulation can be performed in the rear, which belon...

AI Technical Summary

Problems solved by technology

[0002] At present, the Internet of Things terminal is a device that connects the sensor network layer and the transmission network layer in the Internet of Things to collect data and send data to the network layer. When receiving data, the Internet of Things terminal needs to modulate the signal frequency to ensure the stability of the signal frequency. In order to achieve the accuracy of data transmission in the Internet of Things, however, the existing frequency modulation circuit only uses the reference signal or PWM signal to fuse and adjust the frequency with the signal to be frequency modulated. Since the reference signal or PWM signal is an external signal, the external signal and the source signal need to be matched. The frequency modulation can be performed in the rear, which belongs to passive frequency modulation. Once the frequency of the source signal changes greatly and exceeds the matching range, it will result in the inability to perform frequency modulation, which will seriously affect the use effect of the adjustable frequency IoT terminal.

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