RF vs IF. This page describes difference between RF(Radio Frequency) and IF(Intermediate Frequency).It also explains how one frequency is converted to the other and viceversa. Both the terms are used in wireless system, IF to RF and RF to IF conversion can be done using a device called mixer. The same conversion can be achieved by way of single conversion or dual conversion.
In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception. The intermediate frequency is created by mixing the carrier signal with a local oscillator signal in a process called heterodyning, resulting in a signal at the difference or beat frequency.
Put another way, RF stands for “radio frequency” which is a general term and could mean any high frequency signal; say greater than a few MHz. IF stands for “intermediate frequency” and is the frequency of a specific signal in a receiver.. The IF signal is obtained by multiplying the RF signal with an internal signal, one generated by the receiver.
A narrow IF filter bandwidth allows the signal analyzer to maximize IF gain by only allowing a portion of the RF signal to be present at the IF stage at any given time (Fig. 3). When the IF filter ...
are the radio frequency (RF) input, the local oscillator (LO) input, and the intermediate frequency (IF) output. Figure 4.3: The Mixing Process A mixer takes an RF input signal at a frequency fRF, mixes it with a LO signal at a frequency fLO, and produces an IF output signal that consists of the sum and difference frequencies, fRF ± fLO.
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around twenty thousand times per second (20 kHz) to around three hundred billion times per second (300 GHz).
Understanding RF Signals. An RF signal is an electromagnetic wave that communications systems use to transport information through air from one point to another. RF signals have been in use for many years. They provide the means for carrying music to FM radios and video to televisions. In fact, RF signals are the most common means for carrying ...
RF signal is coming from an antenna. So it contains electromagnetic waves. But when the signal is processed using electronics circuits, the range of frequency may not be sufficient.
RF parts are trickier to make and use, and the circuitry more beset with problems of stray capacitance, inductance, noise, ground loops and interference. More so the higher the frequency. But we must have an RF front end because the signal at the antenna connection is just too weak to do anything with but amplify it.
RF remotes use specific radio frequencies, typically a license-free 2.4 GHz bandwidth, to transmit a signal to a receiving device. The signals are able to be sent through objects like walls and furniture, extending the remote’s range. Conversely, the radio frequency bandwidth is very crowded.