Comparison of MAR-7SM and ERA-1SM
The ERA-1SM Amplifier which is specified up to 8 GHz has a much flatter gain over a given frequency range than the MAR-7SM, which is specified only up to 2 GHz. Typical flatness of the ERA-1SM up to 2 GHz is -0.5 dB and the MAR-7SM is -2.5 dB. Above 2 GHz, the gain for the MAR-7SM drops sharply while ERA-1SM's gain stays reasonably flat. The ERA-1SM at 30 mA has a closer resemblance to the MAR-7SM than the ERA-1SM is gain at 40 mA, which is the rated current in the catalog. The output power and IP3 are slightly higher for ERA-1SM at 30 mA than for MAR-7SM at 22 mA. The input VSWR for the MAR-7SM is better than the ERA-1SM and output VSWR is the same for both.
In summary, when operated at 30 mA the ERA-1SM offers a much larger frequency range, much better
gain flatness, a better 1-dB compression point, and a better IP3 than the MAR-7SM.
|
Features |
MAR-7SM
@ 22mA |
ERA-1SM
@ 30 mA |
ERA-1SM
@ 40mA |
| Frequency Range | DC-2 GHz | DC-8 GHz | DC-8 GHz |
| Typ Gain @ 100 MHz | 13.5 dB | 12.3 dB | 12.3 dB |
| Typ Gain @ 1GHz | 12.5 dB | 12.1 dB | 12.1 dB |
| Typ Gain@ 2 GHz | 11.0 dB | 11.8 dB | 11.8 dB |
| Typ Gain@ 4 GHz | 5.2 dB | 10.3 dB | 10.8 dB |
| Typ Gain @ 6 GHz | 2.5 dB | 8.9 dB | 10.0 dB |
| Min Gain @ 2 GHz | 8.5 dB | 9.0 dB | 9.0 dB |
| Typ 1dB Output @ 1 GHz | 5.0 dBm | 5.4 dBm | 11.0 dBm |
| Typ 1dB Output @ 2 GHz | 4.0 dBm | 5.6 dBm | 11.0 dBm |
| Typ IP3 @ 2 GHz | 18 dBm | 20 dBm | 26 dBm |
| Typ VSWR In | 1.2:1 | 1.6:1 | 1.6:1 |
| Typ VSWR Out | 1.5:1 | 1.5:1 | 1.5:1 |
| Typ Device Voltage | 4.0 V | 3.5 V | 3.6 V |
| Typ Noise Figure | 5.0 dB | 5.5 dB | 5.5 dB |