QIFMQuadrature Intermediate Frequency Mixer
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The operation of a QIFM can be understood by following the signal voltage vectors.
Another way of looking at the operation of a QIFM is to realize that the two IF outputs are proportional to a sin[Theta] and a cos[Theta], respectively.
Since the phase discriminator essentially is a QIFM, the PFD can be used as a digital phase receiver, as shown in Figure 5.
A schematic diagram of the passive approach for the single-ended mixer used in the QIFM is shown in Figure 2.
Several techniques are commonly used for obtaining quadrature phase shift in a QIFM.