Topic: Analog Circuits
If two tones $f_{1}$ and $f_{2}$ are amplified by a non-linear amplifier, which frequency components would be present in output?
- A. $f_{1}$, $f_{2}$
- B. $f_{1}, f_{2}, f_{1}+f_{2}, f_{1}-f_{2}$
- C. $f_{1}+f_{2}$, $f_{1}-f_{2}$
- D. $nf_{1}\pm mf_{2}$ where n and m are integers
Answer: D. $nf_{1}\pm mf_{2}$ where n and m are integers
Explanation: When input frequencies $f_1$ and $f_2$ are passed through a non-linear amplifier, intermodulation distortion occurs. The output will contain multiple harmonics and intermodulation products of the form $nf_1 \pm mf_2$, where n and m are integers.