An RF Transmitter is a communication system that processes signals (e.g. filtering, amplifying, routing) in each sub-system and transmits it over the radio channel. A transmitter consists of several components such as antennas, power amplifiers (PAs), filters, couplers, modulators, switches, etc. RF transmitters may also contain multiple channels containing such components, and depending on the application requirements, the desired number of channels may be used.
RF transmitters are used in various applications such as wireless communication systems, radars, military (electronic warfare), RFID, Wi-Fi, Bluetooth, and others.
Since different designs of RF transmitters exist in the market, choosing the right kind of transmitters is important to fulfill the requirements of the application. The following parameters are useful in determining the right RF transmitter design.
Key Parameters to be Considered for RF Transmitter
Operating frequency: This is the frequency range over which the RF transmitter transmits the signal over the radio channel.
Data rate: It is the number of bits or symbols that the transmitter transmits per unit of time (measured as bits or symbols/second).
Modulation Type: Transmitters utilize different types of signal modulation schemes, which include QPSK, FSK, GMSK, GFSK, QAM etc.
Output power: This is the amount of power transmitted over the channel by the transmitter system.
Gain: It is defined as the ratio of the amount of power transmitted by the transmitter antenna to the amount of power that would be delivered by an isotropic antenna.
Supply voltage: It is the amount of power supply required for proper operation. The power supply is usually of DC type.
Package: RF transmitters come in a variety of package configurations. They include surface-mount, chip package, module with connectors, rack-mount etc.
Interfaces: RF transmitters can be controlled and/or powered by a variety of built-in interfaces such as RS-232, Ethernet, USB, GPIO etc.
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