Precision Calibrated CW Solid State Noise Sources

Release time：2024-4-25 9:25:35 Add to cart

Precision Calibrated Noise Sources

Features
ENR 12…15 dB typical High stability Good flatness	No high voltage supply required Compact solid state source High reliability, rugged construction
Applications
Measurement and test equipment Mm-wave noise source Calibration Noise figure measurement Сompatible with noise figure meters for all brand names
Description
ELVA-1's calibrated noise source ISSN-XX series delivers a uniform level of noise power spectral density within the whole waveguide frequency range. Sources are available in eight waveguide bands covering 26.4-170 GHz. A Silicon IMPATT diode is employed as a fundamental building block of the source. High stability of the device allows it to be used for test and instrumentation applications in place of gas-tube noise sources. Low DC power requirements eliminate the need for complex high voltage supplies. There are two operation modes: CW mode and pulsed AM mode with modulation frequency up to 1 kHz. Typical value of excess noise ratio (ENR) as a function of frequency is given on the plot below.
Block Diagram of Noise Source
Inputs and Controls:

Notes:

• Power/ Triggering Inversion Switch can be used for manual ON/OFF. “INV” position is ON.
• Microwave power can be switched with TTL-level control voltage.
• If Triggering Inversion Switch is in OFF (Down) position active level is high, otherwise (INV position) – active level is low.
• Each source supplied calibrated relative to liquid nitrogen cooled load. 

Specifications

Model Number	ISSN-28	ISSN-22	ISSN-19	ISSN-15	ISSN-12	ISSN-10	ISSN-08	ISSN-06
Frequency Band	Ka	Q	U	V	E	W	F	D
and Range, GHz	26.5-40	33-50	40-60	50-75	60-90	75-110	90-140	110-170
Input waveguide	WR28	WR22	WR19	WR15	WR12	WR10	WR8	WR6
Wavequide Flange	UG383/U	UG383/U	UG383/U-M	UG385/U	UG-387/U	UG387/U-M	UG387/U-M	UG387/U-M
Bandwidth, GHz	Full	Full	Full	Full	Full	Full	Full	Full
ENR, dB (nom)	15	14	13	13	13	12	12	12
ENR Flatness, dB	±1	±1.5	±1.5	±1.5	±1.5	±1.5	±1.5	±2
Stability, dB/°C	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
Stability/Day, dB	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Biasing Voltage, V	+18…+28
Sizes, mm*	50/75	50/75	50/75	50/75	50/60	50/60	50/60	50/60
* Cylinder diameter/length (without isolator)

Notes:

• Maximum operating temperature is +60°C
• Diode operating current is 50…100 mA.
• A limiting value of modulation frequency is 1 kHz (external triggering).
• Triggering signal amplitude is TTL level.
• Bias voltage is +18 V It is possible to supply the noise source with +28VDC biasing for the compatibility with commonly used noise meters.
• External triggering connector is SMA female
• ENR would be increased for narrower bandwidth. Please contact factory. 
• For higher frequency models please contact factory.

Power supply for input power 220VAC/50Hz, 110VAC/60Hz or 100VAC/50Hz are available optionally.

For the precision control and fast modulation of the output power of the source Voltage Controlled Attenuator VCVA-XX series can be supplied optionally