What are the necessary functions for a good signal generator?
1. Signal modulation function
Signal modulation means that in a modulated signal, the amplitude, phase, or frequency is changed so that low-frequency information is embedded in a high-frequency carrier signal, and the resulting signal can transmit anything from speech, data, video. Signal modulation can be divided into analog modulation and digital modulation. Of these, analog modulations such as amplitude modulation (AM) and frequency modulation (FM) are most commonly used in broadcast communications, while digital modulation is based on two states, allowing the signal to represent binary data.
2. Frequency scan function
Measuring the frequency characteristics of electronic equipment requires "sweeping" a sine wave, which changes frequency over a period of time. Generally divided into linear (Lin) frequency sweep and logarithmic (Log) frequency sweep; advanced signal generator supports frequency sweep function, you can choose the start frequency, hold frequency, stop frequency and correlation time. In addition, some signal generators also provide swept-synchronized trigger signals.
3. TTL synchronization output function
The TTL synchronization signal output by the general signal source is converted into a square wave through a triode circuit, and the level is 0 (low) and 3.6~5V (high). It is mainly used to synchronize other signal sources or other types of instruments to ensure trigger synchronization, which shows the importance of this function.
4. Reference clock output function
TTL sync output only guarantees trigger sync. If the sources are fully synchronized, the clocks must be synchronized. The reference clock output is designed to synchronize the clocks of the two signal sources. Usually, the reference clock outputs a square wave signal with a relatively stable frequency.
5. Burst function
This function is similar to the OneShot function. Inputting a TTL signal can cause the signal source to generate a signal output cycle. The design method is to ground the output when there is no signal input.
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