Noise Amplifier. DEM1420ULNA Datasheet
Ultra Low Noise Amplifier
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DEM 1420ULNA - 1420 MHz. Ultra Low Noise Amplifier
>6dB @ design frequency
>10dB DC - 3 GHz.
+7 - +16 VDC
The DEM1420ULNA is one of a series of Ultra Low Noise Amplifiers that shares a common
design produced by Down East Microwave Inc. from 900 MHz. through 1700 MHz. Each model is
optimized for it’s own specified frequency. The ULNAs utilizes the latest in PHEMT technology and
is designed for receive systems such as EME stations and weak signal satellite reception requiring
the lowest noise figure as possible. All of the ULNAs are receive only and do not provide any RF
bypass switching circuitry. Standard gains of our ULNAs range from15 - 18 dB. All noise figures for
this series of ULNAs are below 0.4dB. The ULNAs are adjusted on an individual basis for the best
performance possible. This is accomplished with an internal negative voltage power supply that is
separate from the RF circuit and providesDpaotwaSehreseut4pUp.lcyoimsolation for the FET.
Our ULNA design incorporates
a low loss series inductor input circuit
and a resistive loaded output circuit.
During testing, the input circuit is
optimized for gain and noise figure.
The resistive loaded output circuit, is
adjusted to control the gain and is
tested for a constant wide bandwidth
output impedance. This resistive load
impedance absorbs products caused
by reflections from band pass filters or
high Q receiver front ends. We do
not use tuned output circuits or
baluns in our ULNA designs. Tuned
output circuits and baluns do not offer
constant output impedances over wide bandwidths and may cause out of band instabilities from
reflected signals. Tuned circuits may also require returning if a cable length or the tuning of a filter
that is connected to the output of a tuned circuit LNA is changed.
This ULNA design is provided with type “N” connectors that are mounted on a weather
aluminum enclosure that measures 3.75” L
standard die cast enclosure if desired. Both
x 2.5” W x 1.375”
of these enclosures
H. It is also
DataSheet4 U .com
insusceptibility and protects against stray external EMI. DC power is either applied through a Pi-
circuit feed through filter connector which is a simple solder connection that attenuates frequencies
through 18 GHz. It also may be applied through the coax. Specify preference at the time of
order. A higher gain model at all design frequencies is also available. Please consult DEMI with
your requirements. The ULNA design is not offered in kit form.
ULNAs with operating frequencies, configurations, gains and noise figures not found on our
price list or product descriptions can be designed by Down East Microwave Inc. and produced
with relatively short delivery times. Please contact us with your specifications and/or requirements.
Schematic Diagram of 33, 23, 1420 ,1500, and 1691ULNA Design:
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|Features||Datasheet pdf www.DataSheet4U.com DEM 1420ULNA - 1420 MHz. Ultra Low Noise Amplifier Specifi cations: Gain: Noise Figure: P1dB: Inpu t VSWR: Output VSWR: Voltage: 17dB nom inal <.4dB +5dBm output >6dB @ design f requency >10dB DC - 3 GHz. +7 - +16 VDC Product Description: The DEM1420ULNA is one of a series of Ultra Low Noise A mplifiers that shares a common design p roduced by Down East Microwave Inc. fro m 900 MHz. through 1700 MHz. Each model is optimized for it’s own specified frequency. The ULNAs utilizes the lates t in PHEMT technology and is designed f or receive systems such as EME stations and weak signal satellite reception re quiring the lowest noise figure as poss ible. All of the ULNAs are receive only and do not provide any RF bypass switc hing circuitry. Standard gains of our U LNAs range from15 - 18 dB. All noise fi gures for this series of ULNAs are belo w 0.4dB. The ULNAs are adjusted on an i ndividual basis for the best performanc e possible. This is accomplished with an internal negative voltag.|
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