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RF (Radio Frequency) Circuits

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Circuits that require the use of radio frequencies use RF circuits. RF circuits may use various types of components in order to take the transmitted signal and transfer the signal to the required circuits for processing to obtain the desired affect. If everything works correctly, the final result will be a signal that can be heard and understand by someone or can be interpreted by a machine that is designed to respond to the signals. Such basic components that are used in RF circuits include:

o RF receivers – RF receivers take radio signals received from the antenna and separate the radio and audio portions and send those signals to the tuning and finally the audio stages for processing and finalizing. Detectors and demodulators (frequency converters) take the signal that comes from the antenna, extracts the information that was placed there at the transmitter. RF receivers are designed differently, depending on what that of signal they are supposed to receive and accept.
o RF filters – RF filters are used to pass or reject signals or certain frequencies. That’s basically all they do. RF filters will pass certain frequencies that they are created to pass, but will reject signals that they are made to reject. The components in the filter circuit are what provide the filter with its ability. Some RF filters may have more than one capacitor, coil, and/or resistor connected together to form the filter. It really depends on the need of the filter. The type of filter design will determine how much signal is block and filtered.
o RF transistors – RF transistors are specially made transistors that can handle high frequencies. They are made for high-power radio circuits. These transistors are made so as to take the high frequency signal and amplify it. Some applications for these transistors include stereo amplifiers, radio transmitters, and other high-power circuits.
o RF transmitters – RF transmitters are created to produce radio frequencies that are picked up by local receivers. RF transmitters use oscillators to create the frequency which contains the audio and video signals that need to be sent. The RF transmitter has a powerful antenna that can send the signal into the atmosphere up to a distance of many miles.

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