Page 225 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits
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Rin 1
Vin_1
Vout
Rin 2
Vin 2 Rout
Rfeedback
Rin 1
Vin 1
Rin 2
Vin 2 Vout
1
FIGURE 14-1 Examples of summing circuits.
= -[ i -----+ 1 _2 ----]
Mixing circuits, however, are nonlinear in nature. When two signals are combined
into a mixer circuit, either by modulation and/or by nonlinearities of the mixer
circuit, signals at the output of the mixer contain distortion products related to
harmonics and intermodulation of the two signals (Figure 14-2).
