The functions of frequency converter and frequency mixer are different.
Frequency converter is a device that changes the frequency of a signal to another frequency, but it does not change the shape or amplitude of the signal. This process involves modulation or changing the original frequency. For example, a radio station broadcasts wireless signals on a specific frequency, but your electronic device may not be able to receive this frequency, so a frequency converter is needed to convert the signal to another frequency.
Frequency mixer, on the other hand, is a device that combines two or more signals of different frequencies to generate a new signal. The process involves combining two high-frequency signals and outputting the combined signal as an intermediate frequency signal. Frequency mixers are widely used in high-frequency crystal circuits such as radios and radar instruments. Therefore, the fundamental difference between frequency converter and frequency mixer is that the former changes the frequency of the signal to another frequency, while the latter mixes two or more signals together.
In simpler terms, A frequency converter is an electronic device that can convert an electrical signal of one frequency to another frequency. For example, if we need to convert a 100Hz signal to a 200Hz signal, we can use a frequency converter to accomplish this task.
On the other hand, a frequency mixer is another electronic device that can combine two or more different frequency signals to form a new signal. For instance, if we have a 1000Hz signal and a 2000Hz signal, we can use a frequency mixer to combine them and produce a new signal, such as a 3000Hz signal.