RF receiver
In an RF receiver, an incoming RF signal is first passed through an RF bandpass filter to remove signal components outside of the frequency range of the desired signal. The resulting filtered signal is then usually amplified by a low noise amplifier. A radio frequency receiver includes a frequency converter for converting a received radio frequency signal to an intermediate frequency (IF) signal. An IF filter is coupled to the frequency converter for limiting the IF signal to the bandwidth of a communication channel. The band -limited signal is applied to a demodulator where the signal is processed to recover the original baseband frequency signal. A low power RF receiver circuit comprises a low noise preamplifier and double-balanced mixer, using novel monolithic microstrip inductors and transformers for radio frequency IC (integrated circuit) applications using submicron bipolar CMOS process technology. RF receivers normally include a means for preventing tracking error, which is the deviation between a tuning frequency of an RF tuning circuit and a frequency of an RF signal to be converted to a desired IF signal at a mixer circuit. A direct-conversion receiver in a radio communication system is configured to have a varying gain in order to track the varying signal strength of the received RF signal. Radio frequency (RF) receivers for cellular phone base stations must provide high degrees of both selectivity and sensitivity. An important measure of a receiver's performance is its sensitivity and one means for measuring this sensitivity is to compare the measured bit error rate (BER) of a received signal with the signal to noise ratio. Antennas are provided as accessories of RF receivers in order to provide the receivers with the capability of receiving RF signals that are transmitted over the air.
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