mmw Amplifiers Specification Selection Guide
(Gp, Ga, |S21|2, GCR)
- The amount of power amplification provided by the gain block in dB.
- Most gain blocks are intended to be used without additional matching. For these amplifiers the power gain (Gp) is also equal to |S21|2 (The unmatched gain in a 50 ohm system). Some ICs are intended to be used with additional matching and the gain specified may be a tuned gain depending on this matching. If the matching provides an optimal noise match to the input and a conjugate (optimal gain) match to the output, then the gain is called associated gain (Ga).
- The input power Pin (in dBm) is equal to Pout (in dBm) - Gp (in dB). Gain decreases with frequency and increases with bias.
- Needs to fit application. More gain means less stages but too much gain can lead to stability problems or saturation. In general more is better.
- 6 - 25 dB