Single Ended BJT Mixer(Nonlinear)
A single ended BJT mixer is shown in Figure 1.
In active region the BJT is modeled as .
From the Figure 1,
If , then
Typically . So is given by
Substituting in Eq(1),
In Eq.(4), except term all other terms are near to LO frequency or higher than LO frequency. Therefore they can be filtered out by output filter.
Votlage conversion gain is,
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