GHz transistor array IC needed

[neazoi]

I have a small two stage BFR91A based preamplifier, and I would like to replace this with a transistor array of similar performance as far as concern Ft and gain.
Any suggestions which array IC to use?

 

[betwixt]

I very much doubt that any array would exist. The mechanical demands of an array would make the performance unattainable and even if one did exist, packaging microwave transistors in a confined space would make a PCB virtually impossible to design.

Why do you need such a device?

Brian.

 

[neazoi]

I very much doubt that any array would exist. The mechanical demands of an array would make the performance unattainable and even if one did exist, packaging microwave transistors in a confined space would make a PCB virtually impossible to design.

Why do you need such a device?

Brian.

For a discrete fun like me, using an array seems odd indeed. The reason are copy reasons. I want to build something but I do not want to be easy to be coppied. An array with deleted markings makes this more difficult.

 

[BigBoss]

What is the frequency of operation ?

 

[neazoi]

What is the frequency of operation ?

It is for HF. Using these GHz transistors provides a flat gain even to 30MHz and my application is gain marginal, so loss cannot be afforded.

 

[BigBoss]

I guess what you're looking for.

Transistor Arrays

Renesas' portfolio of transistor arrays include NPN, PNP and NPN-PNP combination transistor arrays based on our complementary UHF-1 SOI process.

www.renesas.com

If you don't like, use an "Integrated RF Amplifier" from Minicircuits, Texas Insturments etc.

RF gain block amplifiers product selection | TI.com

Select from TI's RF gain block amplifiers family of devices. RF gain block amplifiers parameters, data sheets, and design resources.

www.ti.com

 

[neazoi]

I guess what you're looking for.

Transistor Arrays

Renesas' portfolio of transistor arrays include NPN, PNP and NPN-PNP combination transistor arrays based on our complementary UHF-1 SOI process.

www.renesas.com

If you don't like, use an "Integrated RF Amplifier" from Minicircuits, Texas Insturments etc.

RF gain block amplifiers product selection | TI.com

Select from TI's RF gain block amplifiers family of devices. RF gain block amplifiers parameters, data sheets, and design resources.

www.ti.com

Exactly, these seem just right. Super expensive though...

 

[FvM]

E.g. HFA3127

--- Updated Dec 2, 2023 ---

You'll use arrays for a reason, e.g. building differentail amplifiers or other circuits that take advantage of temperature and parameter matching. Unlikely for a trivial two-stage amplifier.

 

[gerhard_dk4xp]

These are some of the very last RF PNPs.

Remember them if you need a folded cascode!

 

[D.A.(Tony)Stewart]

https://www.win-source.net/products/detail/vishay/bfr91a.html

 

[dick_freebird]

UHF-1 is old, maybe obsolete, may account for pricing (let the die
last by jacking up the unit price).

It was a big deal in the early '90s. 8GHz NPN, 4GHz PNP , silicon on
insulator. I don't think there were any new products made on it after
the Intersil IPO. You can't do high band PAs when your fT is less than
2X the carrier and the market moved faster (way) than their process
development group did. They had the first WiFi modem chip set
but got left in the dust (the majority of the chip set was outsourced
for foundry even then). But the WiFi story propelled the IPO.

THAT Corp makes higher voltage transistor arrays with NPN fT in
the 700MHz range, PNP around 300MHz, >30V BVceo. Similar idea
to the UHF-1 arrays, couple of flavors. Could be adequate for 30MHz
depending on gain-per-stage. Either Digi-Key or Mouser, forget which.