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ST-2A PDF预览

ST-2A

更新时间: 2024-12-01 09:03:27
品牌 Logo 应用领域
MICRONETICS 二极管
页数 文件大小 规格书
1页 221K
描述
MINI-NOISE DIODES 10 KHZ TO 3 GHZ

ST-2A 数据手册

  
Return to Noise Source Index  
http://www.micronetics.com/Noise_Diode_SMT/Surface_Mount_NC302L_ST2A.pdf  
ST-2A MINI-NOISE  
DIODES  
10 KHZ TO 3 GH  
Z
D
ESCRIPTION  
Micronetics' ST-2A Diode with  
its small, surface mount SOT-  
23 package are ideally suited  
for medium and high volume  
production circuits. Their  
Gaussian wideband highly  
stable noise characteristics  
make them ideal for several  
applications from built-in  
Microwave receiver calibra-  
tion, to A/D dithering.  
P
INOUT  
MINI -NOISE DIODE SPECIFICATIONS  
Pin 1 - Ground  
Pin 2 - Bias/Noise Output  
Pin 3 - N/C  
MODEL  
FREQUENCY  
RANGE  
OUTPUT (1) FLATNESS (2) TYP BIAS (2)  
TYP DC+  
NUMBER  
ENRdB (min)  
dB (max)  
CURRENT (max) BIAS  
ST-2A  
10 KHz - 1 MHz  
1 MHz – 100 MHz  
100 MHz – 3 GHz  
33  
30  
2.0  
2.0  
2-4 mA  
2-4 mA  
2-4 mA  
5.2v  
5.2v  
5.2v  
See style code Z on our web-  
site for additional outline  
details:  
28  
2.0  
http://www.micronetics.com  
(1) ENR is measured in a 50 ohm system.  
(2) Spectral response varies with bias current. Differing levels of ENR and in-band flatness  
can be realized by adjusting bias current.  
Application Notes:  
Microwave Receiver Calibration: There are two built-in tests commonly performed with  
noise. One is a straightforward noise figure or noise temperature test. The other is a spec-  
tral calibration, which uses the broadband flat frequency output of the noise to test frequen-  
cy response. This test typically requires a higher amplitude noise signal than the noise  
temperature test and may require a gain stage to boost the signal.  
A/D Converter Dithering Circuit: Sensitivity can be increased significantly when summing  
low frequency noise (in the range of 10 KHz - 5 MHz depending on the A/D converter) with  
the IF frequency prior to the input of the A/D Converter. The noise signal amplitude needs  
to be boosted significantly from the output of the noise diode. Designers usually take two  
approaches, one at 50 ohm in which standard radio frequency gain blocks are used and  
the noise is combined with the signal at 50 ohms. The signal +noise is then converted to  
high impedance prior to being fed into the A/D. The second uses op amps to boost the  
noise signal and the noise is summed with the signal all at high impedance and fed directly  
into the A/D.  
Encryption: In this usage, the Gaussian output of the noise is used to generate random  
numbers by sampling the voltage of the noise using an A/D converter. Frequency require-  
ments are usually a function of the system parameters of the random numbers desired. As  
with the dithering circuit, the noise amplitude form the diode needs to be boosted with gain.  
These circuits are typically high impedance.  
MICRONETICS / 26 HAMPSHIRE DRIVE / HUDSON, NH 03051 / TEL: 603-883-2900 / FAX: 603-882-8987  
WEB: WWW.MICRONETICS.COM  

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