Shanghai Jianrong domestic function signal generator converted into sine wave . The principle is:
According to the Fourier transformation, the triangle wave is expanded into Fourier series. It can be seen that it contains fundamental wave and odd harmonics such as 3rd and 5th times. Therefore, the fundamental wave is taken out through low-pass filter , filter out high harmonic , and convert the triangle wave into sine wave. This method is suitable for situations where fixed frequency or frequency variation range is small. The waveform of the input voltage and the output voltage, the frequency of uO is equal to the frequency of the fundamental wave of uI.
Domestic function signal generator http://www.jetyoo.com/jetyoo-Products-37027277/
Power characteristics of the domestic function signal generator:
1) Maximum output power
can provide the maximum power to the rated load impedance.
2) Output power range
is within the adjustable power range that can be obtained in a given frequency band.
3) Power Accuracy
error provided by the output signal to the rated load impedance actual power deviation indicating value within the specified power range.
4) Power Flatness
Under a certain power output condition, the output signal is provided to the rated load impedance relative fluctuation of the actual power output with the output frequency.
5) Source voltage standing wave ratio (source standing wave)
The ratio of the maximum standing wave voltage value and the minimum standing wave voltage value of the RF output port caused by changes in external load characteristics, which reflects the degree of the output impedance of the microwave signal generator deviating from the nominal impedance .
Domestic function signal generators are divided into four categories according to their signal waveform:
1, random signal generator
is usually divided into two categories: noise signal generator and pseudo-random signal generator. The main purpose of the noise signal generator is: to introduce a random signal into the system to simulate the noise in actual working conditions and measure the system performance; to compare a known noise signal with the internal noise of the system to measure the noise coefficient; to replace the sinusoidal or pulse signal with a random signal to measure the dynamic characteristics of the system, etc. When using a noise signal to measure the correlation function, if the average measurement time is not long enough, statistical errors will occur, which can be solved by pseudo-random signals.
2 and sine signal generator
are mainly used to measure the frequency characteristics, nonlinear distortion, gain and sensitivity of circuits and systems. According to its different performance and uses, it can also be subdivided into low-frequency (20 Hz to 10 MHz) signal generator , high-frequency (100 kilohert to 300 MHz) signal generator, microwave signal generator, sweep and program-controlled signal generator, frequency synthetic signal generator, etc.
3, pulse signal generator
can generate rectangular pulses with adjustable width, amplitude and repetition frequency. It can be used to test the transient response of linear systems, or as an analog signal to test the performance of radar , multiple communications and other pulse digital systems.
4, function (waveform) signal generator
can generate certain specific periodic time function waveforms (sine wave, square wave , triangle wave, sawtooth wave and pulse wave, etc.), and the frequency range can range from several microHz to tens of megahertz. In addition to being used for testing communications, instrumentation and automatic control systems, it is also widely used in other non-electrical measurement fields.
