Brief introduction to the working principle of high frequency signal generator

The high-frequency signal generator is mainly used to supply high-frequency signals of various electronic measuring instruments or other electronic equipment , Such as the bridge 、 Measuring line 、 Resonance circuit 、 The antenna supplies high-frequency signal energy , In order to test its performance . High frequency signal generator generally has large output power , However, the frequency and amplitude of the output signal may have large errors , Its waveform may have large distortion .

High frequency signal , As the name suggests, it is a signal with higher frequency . In electronics and high-speed digital design , There are different judgment criteria . High frequency and low frequency not only depend on the frequency of the signal , It also depends on the rising edge and falling edge time of the signal . Generally, megahertz signal can be regarded as high frequency .

A signal with a lower frequency . To be exact , General RF category 10M Following , In general circuits 1M Following . Low frequency refers to the lowest frequency range applied in a technical field . for example , In the radio band , take 30～300 Frequencies in the kilohertz range are called low frequencies ; In an electronic amplifier circuit , Will approach the audio (20 Hertz ～2 Ten thousand Hertz ) The frequency of is called low frequency . Generally speaking, it means 20HZ-160HZ This frequency . In the sound that can be heard by the whole human ear , Low frequency is the basis of sound , Is the thickness of the sound .

Basic composition principle of high frequency signal generator

(1) Main vibration level high frequency signal generator main vibration level is used to generate high frequency sine wave signal whose frequency can be adjusted within a certain range . Frequency characteristics of signal generator , Such as frequency range 、 Frequency stability and accuracy 、 The spectral purity is mainly determined by the main vibration level . In order to ensure that the signal generator has high frequency stability , Generally, single tube oscillation circuit or double tube push-pull oscillation circuit with inductive feedback or transformer feedback is adopted .

(2) Buffer level - Freeze dryer

　　 Amplify the high-frequency signal output from the main vibration stage ; It acts as an isolation between the main vibration level and subsequent circuits , To improve the stability of oscillation frequency .

(3) Modulation stage

Amplitude modulation of the main vibration signal by external modulation signal or internal modulation signal , Output amplitude modulation signal , To meet the needs of some measurements .

(4) Internal modulation signal generator

　　 The modulation signal used by the high frequency signal generator includes internal modulation signal and external modulation signal . The internal modulation signal is generally composed of RC Oscillator generation , The frequency is generally 400 Hz and 1 000 Hz Two kinds of . The input signal is modulated through the external terminal panel . The conversion between external modulation and internal modulation is controlled by a switch .

(5) Output stage

The function of the output stage circuit in the high frequency signal generator is :① Zoom in 、 Attenuate the output signal of the modulator , Make the output level of the signal generator have enough adjustment range ;② Filter out unwanted frequency components ;③ Ensure that the output terminal has a fixed output impedance (50 SZ). It usually consists of an amplifier 、 Filter and coarse filter 、 Fine attenuator, etc . In order to adapt to different use conditions , It is required that the output level can be attenuated step by step , And can continuously adjust .

Product introduction

SYN5641 RF generator It is an easy to integrate RF microwave signal generation module with high cost performance . The RF generator adopts direct digital synthesis and phase-locked technology , The output frequency is up to 30GHz, Low cost of ownership , Low harmonic , Low phase noise , Wide frequency and fast switching , It is a cost-effective test signal generation solution tailored for users .

The RF generator is widely used in communication 、 metering 、 In national defense and scientific experiments , It is mainly used for all kinds of complete machines 、 Systems and components 、 Testing of components , Provide excitation or analog signal , It's very suitable for 0～30GHz Various RF and microwave segments are developed and used , Include P,L,S,C,X,Ku,K and Ka Equiband .

Advantages and disadvantages ：

The variable reactor in the high frequency signal generator is connected with the resonant circuit of the main vibration stage , Make the main vibration level generate FM signal . Varactor frequency modulation circuit is often used in high frequency signal generator .

The low frequency is 30~300kHz, If frequency is 300~3000kHz, The high frequency is 3~30MHz, The frequency range is 30~300MHz Very high frequency , The frequency range is 300~1000MHz Or higher is UHF . Low frequency signal changes slowly 、 Smooth waveform .

3MHz To X00GHz The frequency range of is called high frequency . The distortion rate of high-frequency signal is small , It has strong recoverability , And the anti-interference rate is strong , Low frequency is easily hindered by objects on the ground and in the air and affects its own properties , Like asking for help at sea , High frequency signals can accurately convey the location of the ship in distress .

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