RF transmitter
RF transmitters are widely used in radio frequency communications systems, such as cellular and satellite mobile phone communications devices. Such wireless communication device includes a built-in radio transceiver or is coupled to an associated radio transceiver. The RF transmitter may be part of an RF transceiver, wherein a duplexer or RF switch is placed between the RF power amplifier and the antenna, so that received communication signals from the antenna may be switched to a receive circuit. An RF transmitter includes a data modulation device, intermediate frequency circuits, and a power amplifier. The modulator modulates an input signal and converts raw data into baseband signals in accordance with the particular wireless communication standard. The intermediate frequency circuits mix the baseband signals with one or more local oscillations to produce RF signals. In order to make it possible to raise the power of the RF signals for transmission, the transmitter is provided with a power amplifier which is coupled to the modulator to amplify the modulated input signal. The radio frequency power amplifier is connected to an antenna that transmits the amplified modulated input signal. Compact RF transmitters are widely employed to transmit radiating signals for use in connection with remote signal communication systems. Compact handheld transmitters are usually battery operated and are generally required to accommodate a compact enclosure and to exhibit efficient power usage.
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