Post subject: Mini-Circuits Coaxial Amplifiers Supply
Voltage? Posted: Fri Jul 17, 2009 5:46 pm
Joined: Fri Jul 17, 2009 5:42 pm
is the supply voltage (15VDC or 24VDC) on Mini-circuits 50 Ohm Coaxial
5 to 500MHz
10 to 1000MHz
10 to 2500MHz
Mini-circuits can't give me a spec they just
say - "any well-regulated low-noise power supply". The Project Manager/Scientist
where I work wants me to spec something to power these that has
the same specs as Laboratory bench top grade variable power supplies
with line and load regulation <0.01% of maximum output and ripple
and noise <10mV P-P (constant voltage mode). But I'm not so sure
if they have to be that good?
Post subject: Re: Mini-Circuits Coaxial Amplifiers Supply
Voltage?Posted: Sun Jul 19, 2009 2:52 pm
Joined: Mon Jun 27, 2005 2:02 pm
There is a good applicaiton note provided
by Minicircuits regarding the bias requirements for amplfieirs,
although this document applies to IC's (MMICs), it would also be
relevant for coaxial amps.
In general, for RF amplifiers it is important to provide a low
noise supply voltage, as any noise on the supply voltage can be
easily coupled to the RF signal.
for a 15VDC and above supply <10mVPtP
ripple and noise requirement is not easy to achieve.
design practice is to use:
1. Low-noise LDO with several
bypass capacitors (having different values).
2. RFC (RF Choke)
connected between the RF output of the amp to the supply. Its value
should give several hundreds of ohms at the lowest frequency of
Important: The SRF should be higher than the
highest frequency of operation.
3. You can also use Ferrite
Bead connected between the supply voltage and the bypass capacitors.
It will help to absorb and reduce radiated and conducted noise.
It is important to choose the right one in terms of frequency range
Post subject: Re: Mini-Circuits
Coaxial Amplifiers Supply Voltage?Posted: Wed Aug 05, 2009 11:35
Joined: Wed Aug 05, 2009 11:33 pm
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Post subject: Re: Mini-Circuits Coaxial Amplifiers Supply Voltage?Posted:
Wed Aug 12, 2009 11:28 am
Jul 17, 2009 5:42 pm
Thanks for the reply
and for the information, it was very helpful.