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Mini-Circuits Coaxial Amplifiers Supply Voltage? - RF Cafe Forums

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Post subject: Mini-Circuits Coaxial Amplifiers Supply Voltage? Posted: Fri Jul 17, 2009 5:46 pm


Joined: Fri Jul 17, 2009 5:42 pm
Posts: 2
How critical is the supply voltage (15VDC or 24VDC) on Mini-circuits 50 Ohm Coaxial amplifiers?

say -

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?

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Post subject: Re: Mini-Circuits Coaxial Amplifiers Supply Voltage?Posted: Sun Jul 19, 2009 2:52 pm

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany

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.

A good 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 operation.

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 and impedance.

Best regards,

- IR


Post subject: Re: Mini-Circuits Coaxial Amplifiers Supply Voltage?Posted: Wed Aug 05, 2009 11:35 pm


Joined: Wed Aug 05, 2009 11:33 pm
Posts: 1
Thanks for sharing this useful information. It's great.

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Post subject: Re: Mini-Circuits Coaxial Amplifiers Supply Voltage?Posted: Wed Aug 12, 2009 11:28 am


Joined: Fri Jul 17, 2009 5:42 pm
Posts: 2

Thanks for the reply and for the information, it was very helpful.


Posted  11/12/2012
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