RF Frequency: 1 to 18 GHz
Gain @ 20K: 35dB ± 2dB
Noise temperature @ 20 K: <8K at 1 to 20 GHz
Noise figure @ 20 K: < 0.13 dB
Noise figure @ 300K <1.5 dB
IRL (-20log | S11 |) > 0 dB (stablem all frequencies)
>10 dB at 9 to 22 GHz
ORL (-20log | S22 |) > 10 dB at 1 to 18 GHz
Operating temperature: 4.2 K- 320 K
DC power @300K 1.5V, 34mA, 51mW
DC power @ 20 K: 1.2V, 27mA, 33 mW
Output power for -3 dBm
1 dB compression
Safe input power level < 0 dBm
The CIT118 is a GaAs HEMT cryogenic, low noise, broadband amplifier. The amplifier requires one drain voltage in the 0.6V to 1.5V range and one gate voltage in the -3 V to +1 V range through terminals Vg1 and Vg2, each with 11K DC input resistance. See the table on p. 4 of the PFD for performance vs bias voltages. If desired the gate supply can be eliminated (open circuit pins Vg1 and Vg2) at slightly less than optimum performance.
The amplifier may be operated at room temperature to give a noise figure < 1,70 dB and gain < 33dB from 0.5 to 22 GHz. Note that a more negative gate supply voltage, typically -1.5V is required at room temperature. However the amplifier is not damaged if the gate voltage for cryogenic operation, typically 0V, is applied at room temperature (though the gain will be low). Input and output return loss change very little from 300K to 4K. For more information and complete specs, please download the pdf data sheet on the left.