A while back I got a box of random rf parts and in it there were 3 of these Phillip's PA chips. The only thing I know about them is they are 75ohm and and the power pins take 20vdc. I'm thinking about selling them or finally using them but the exact parts I have are custom stamped with in house part #s so in order to do anything with them i need to characterize them first....

How can I safely test these things with the VNA? All my flat wideband (DC-7ghz) attenuators are only rated at a watt. I have no idea how much these things will output at what frequency, there pretty chunky with an aluminum heat dissapator built in to the IC so I'm guessing they are over 5 watts.. I just have no idea, here is a picture of a Phillip's amp with the same module package, to get a feel for there power level

https://www.ebay.com/i/123866819151?rt=nc&_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20161006002618%26meid%3Dbef1aae21fcb48e8a3a1f45c5fcf6689%26pid%3D100694%26rk%3D3%26rkt%3D30%26mehot%3Dnone%26sd%3D402283623938%26itm%3D123866819151%26pmt%3D1%26noa%3D1%26pg%3D2386202%26algv%3DDefaultOrganic%26brand%3DUnbranded

Robert,
That general style of amplifier is mainly used in cable TV systems (hence the 75 ohm impedance).  Typical frequency is up to 1GHz or so,  maximum power levels are on the order of 0.5W.  Your attenuators are probably safe for at least short-time use.  If you are worried you can make a low frequency attenuator out of some carbon-composition resistors and see what sort of saturated power level it generates at, say 100MHz.
--John Gord

On Tue, Sep 22, 2020 at 10:22 AM, Robert Gast wrote:

>
> A while back I got a box of random rf parts and in it there were 3 of
> these Phillip's PA chips. The only thing I know about them is they are
> 75ohm and and the power pins take 20vdc. I'm thinking about selling them
> or finally using them but the exact parts I have are custom stamped with
> in house part #s so in order to do anything with them i need to
> characterize them first....
>
> How can I safely test these things with the VNA? All my flat wideband
> (DC-7ghz) attenuators are only rated at a watt. I have no idea how much
> these things will output at what frequency, there pretty chunky with an
> aluminum heat dissapator built in to the IC so I'm guessing they are over
> 5 watts.. I just have no idea, here is a picture of a Phillip's amp with
> the same module package, to get a feel for there power level
>
> https://www.ebay.com/i/123866819151?rt=nc&_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20161006002618%26meid%3Dbef1aae21fcb48e8a3a1f45c5fcf6689%26pid%3D100694%26rk%3D3%26rkt%3D30%26mehot%3Dnone%26sd%3D402283623938%26itm%3D123866819151%26pmt%3D1%26noa%3D1%26pg%3D2386202%26algv%3DDefaultOrganic%26brand%3DUnbranded
>

Really?! Only a half a watt, that seems pretty lame based on there package
style!

On Tue, Sep 22, 2020, 11:48 AM John Gord via groups.io <johngord=
verizon.net@groups.io> wrote:

> Robert,
> That general style of amplifier is mainly used in cable TV systems (hence
> the 75 ohm impedance). Typical frequency is up to 1GHz or so, maximum
> power levels are on the order of 0.5W. Your attenuators are probably safe
> for at least short-time use. If you are worried you can make a low
> frequency attenuator out of some carbon-composition resistors and see what
> sort of saturated power level it generates at, say 100MHz.
> --John Gord
>
> On Tue, Sep 22, 2020 at 10:22 AM, Robert Gast wrote:
>
> A while back I got a box of random rf parts and in it there were 3 of
> these Phillip's PA chips. The only thing I know about them is they are
> 75ohm and and the power pins take 20vdc. I'm thinking about selling them or
> finally using them but the exact parts I have are custom stamped with in
> house part #s so in order to do anything with them i need to characterize
> them first....
>
> How can I safely test these things with the VNA? All my flat wideband
> (DC-7ghz) attenuators are only rated at a watt. I have no idea how much
> these things will output at what frequency, there pretty chunky with an
> aluminum heat dissapator built in to the IC so I'm guessing they are over 5
> watts.. I just have no idea, here is a picture of a Phillip's amp with the
> same module package, to get a feel for there power level
>
>
> https://www.ebay.com/i/123866819151?rt=nc&_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20161006002618%26meid%3Dbef1aae21fcb48e8a3a1f45c5fcf6689%26pid%3D100694%26rk%3D3%26rkt%3D30%26mehot%3Dnone%26sd%3D402283623938%26itm%3D123866819151%26pmt%3D1%26noa%3D1%26pg%3D2386202%26algv%3DDefaultOrganic%26brand%3DUnbranded
>
>
>

Robert,
For the CATV application, with its multiple (!) carriers, the emphasis is on low distortion, not efficiency.  They are usually push-pull amplifiers to reduce second order distortion, but the bias is power-hungry class A to keep all the distortion products low.
--John Gord

On Tue, Sep 22, 2020 at 11:53 AM, Robert Gast wrote:

>
> Really?! Only a half a watt, that seems pretty lame based on there package
> style!
>
> On Tue, Sep 22, 2020, 11:48 AM John Gord via groups.io ( http://groups.io )
> <johngord= verizon.net@groups.io > wrote:
>
>> Robert,
>> That general style of amplifier is mainly used in cable TV systems (hence
>> the 75 ohm impedance).  Typical frequency is up to 1GHz or so,  maximum
>> power levels are on the order of 0.5W.  Your attenuators are probably safe
>> for at least short-time use.  If you are worried you can make a low
>> frequency attenuator out of some carbon-composition resistors and see what
>> sort of saturated power level it generates at, say 100MHz.
>> --John Gord
>>
>> On Tue, Sep 22, 2020 at 10:22 AM, Robert Gast wrote:
>>
>>> A while back I got a box of random rf parts and in it there were 3 of
>>> these Phillip's PA chips. The only thing I know about them is they are
>>> 75ohm and and the power pins take 20vdc. I'm thinking about selling them
>>> or finally using them but the exact parts I have are custom stamped with
>>> in house part #s so in order to do anything with them i need to
>>> characterize them first....
>>>
>>> How can I safely test these things with the VNA? All my flat wideband
>>> (DC-7ghz) attenuators are only rated at a watt. I have no idea how much
>>> these things will output at what frequency, there pretty chunky with an
>>> aluminum heat dissapator built in to the IC so I'm guessing they are over
>>> 5 watts.. I just have no idea, here is a picture of a Phillip's amp with
>>> the same module package, to get a feel for there power level
>>>
>>> https://www.ebay.com/i/123866819151?rt=nc&_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20161006002618%26meid%3Dbef1aae21fcb48e8a3a1f45c5fcf6689%26pid%3D100694%26rk%3D3%26rkt%3D30%26mehot%3Dnone%26sd%3D402283623938%26itm%3D123866819151%26pmt%3D1%26noa%3D1%26pg%3D2386202%26algv%3DDefaultOrganic%26brand%3DUnbranded
>>>
>>
>>
>
>
>

Robert, spec sheet here BGY588 Datasheet pdf - CATV amplifier module - Philips 


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BGY588 Datasheet pdf - CATV amplifier module - Philips

BGY588 datasheet, BGY588 pdf, BGY588 data sheet, datasheet, data sheet, pdf, Philips, CATV amplifier module
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and attached.
Regards, John Wilkinson



On Wednesday, 23 September 2020, 5:22:27 am NZST, Robert Gast <robert.w.gast@gmail.com> wrote:

A while back I got a box of random rf parts and in it there were 3 of these Phillip's PA chips. The only thing I know about them is they are 75ohm and and the power pins take 20vdc. I'm thinking about selling them or finally using them but the exact parts I have are custom stamped with in house part #s so in order to do anything with them i need to characterize them first.... 

How can I safely test these things with the VNA? All my flat wideband (DC-7ghz) attenuators are only rated at a watt. I have no idea how much these things will output at what frequency, there pretty chunky with an aluminum heat dissapator built in to the IC so I'm guessing they are over 5 watts.. I just have no idea, here is a picture of a Phillip's amp with the same module package, to get a feel for there power level

https://www.ebay.com/i/123866819151?rt=nc&_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20161006002618%26meid%3Dbef1aae21fcb48e8a3a1f45c5fcf6689%26pid%3D100694%26rk%3D3%26rkt%3D30%26mehot%3Dnone%26sd%3D402283623938%26itm%3D123866819151%26pmt%3D1%26noa%3D1%26pg%3D2386202%26algv%3DDefaultOrganic%26brand%3DUnbranded