RF Term
Frequency Converter
Frequency Converter is a concept in RF and microwave engineering. This term is commonly encountered in the design, analysis, and testing of radio frequency systems and components. A comprehensive technical definition with formulas, comparison tables, and FAQs will be added in a future update.
Key Equations
Mixer conversion loss:
CL = PIF/PRF (passive mixer)
CG = PIF/PRF (active mixer, gain)
Frequency plan:
fIF = |fRF−fLO| (down-convert)
fRF = fLO+fIF (up-convert)
Image frequency:
fimage = fLO±fIF (unwanted)
CL = PIF/PRF (passive mixer)
CG = PIF/PRF (active mixer, gain)
Frequency plan:
fIF = |fRF−fLO| (down-convert)
fRF = fLO+fIF (up-convert)
Image frequency:
fimage = fLO±fIF (unwanted)
Comparison
| Architecture | CL/CG | IIP3 | NF | Application |
|---|---|---|---|---|
| Passive diode mixer | 6–9 dB CL | >+15 dBm | CL+1 dB | General |
| Active Gilbert cell | 0–15 dB CG | +5–15 dBm | 8–15 dB | IC integration |
| Image-reject mixer | 7–10 dB CL | >+10 dBm | CL+1 dB | No image filter |
| Subharmonic mixer | 10–15 dB CL | +5–10 dBm | CL+2 dB | mmW (fLO/2) |
| I/Q demodulator | 0–10 dB CG | Variable | 8–12 dB | Direct conversion |
Overview
Frequency Converter plays a role in modern RF and microwave system design. Understanding this concept is important for engineers working with radio frequency circuits, antennas, signal processing, and electromagnetic compatibility. This page will be expanded with detailed technical content, engineering equations, comparative reference tables, and frequently asked questions.
See Also