The HPDA-5 distribution amplifier exceeds the performance required to distribute state-of-the-art atomic frequency standards. The HPDA-5 offers 126 dB of channel to channel isolation and 135 dB of reverse isolation. The exceptionally low phase-noise -150 dBc/Hz at 1 Hz implies a short term frequency stability of 1 part in 1014 at 1 s. The HPDA-5 exhibits a low temperature coefficient of phase of 3 ps/ºC throughout the operating range. The input and outputs have a low VSWR to minimize environmental effects on frequency distribution through long transmission lines. The HPDA-5 is an enhanced version of the NIST high isolation distribution amplifier.The power supply requirements are +/- (12.5 to 15) VDC and +/-0.25 A. A "loss of signal" monitor line is available on the NIM backplane.
HPDA-5NM Users Manual
Specifications
ParameterConditionsMinTypMaxUnits
Input Power 1 db compression 17 18 - dBm
Bandwidth +/-1 dB 1-20 - - MHz
Gain @5MHz - - +/-0.5 dB
Impedance Input
Output		 -
-		 50
50		 -
-		 Ohms
Return loss Input(S11) 5 MHz
Output (S22) 5 MHz		 -
-		 -35
-25		 -25
-25		 dB
Distortion +13 dBm
+17dBm		 -
-		 -48
-40		 -45
-		 dBc
Isolation Output to output
Output to input		 120
120		 126
135		 -
-		 dB
Phase noise
Phase noise plot available here		 1 Hz
10 Hz
1 kHz
10 kHz		 -
-
-
-		 -150
-160
-171
-172		 -147
-157
-169
-170		 dBc/Hz
Temperature-delay coefficient 0-50 °C
25-35 °C		 -
-		 3
1.5		 5
-		 ps/°C
All tests done at 5 MHz and +13 dBm input unless otherwise specified

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