Newish pHEMTs for 12 and 20 GHz...

[Phil Hobbs]

(Forked from the debouncer thread)

On 2020-08-13 16:26, John Larkin wrote:

On Thu, 13 Aug 2020 12:43:51 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 12:06, jlarkin@highlandsniptechnology.com wrote:
On Thu, 13 Aug 2020 11:24:05 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 06:24, Don Y wrote:
On 8/13/2020 2:43 AM, Pimpom wrote:
On 8/13/2020 12:18 PM, Don Y wrote:
On 8/12/2020 11:22 PM, Pimpom wrote:
On 8/12/2020 9:13 PM, jlarkin@highlandsniptechnology.com
wrote:
Why do you need to debounce?

Nothing specific at the moment. I just want to have a stock
standalone solution for future applications.

So, you\'re going to FIX the cost and capabilities of that
\"solution\" without concern for the needs of those \"future
applications\"???

shakes head

I don\'t understand the head shaking. Anyone who designs
circuits regularly will have their favourite solution for a
common task. I\'ve used various debouncing techniques but they
all require passive components, a particular type of switch,
and in some cases another active device to complement the main
active devices.

If there\'s an inexpensive standalone part that needs no
external parts and can replace those techniques in most
applications, what\'s wrong with using that as a stock
solution? A 2N3904/BC547 transistor can be used at the heart of
a wide range of low frequency low power applications. Why hunt
for a suitable type every time?

What do you do when you need a greater Icc? Do you have your
\"favorite FET\"?

I sure do. Besides the late lamented BF862 (of which I have
several reels), there\'s the CPH3910 and my new fave, the Mini
Circuits SAV-551+, which (with a bit of circuit magic) makes the
world\'s finest bootstraps.


SAV-551 is a great switch to ground too. 2 ohms, half a pF. Good for
steering current, discharging ramps, changing gain, or switching
caps in and out. It only needs a half volt or so of gate swing, but
you can drive it from bigger stuff with just a series gate resistor.

Have you tried the new 18-GHz Renesas pHEMT parts as switches? They
wouldn\'t have much chance to oscillate in that service.

I didn\'t know about them. Got a part number that you like?

I haven\'t used them yet, but I\'ll get some to try.

There are several nice ones here, and DK has zillions of them.

https://www.digikey.com/short/zrqbt3

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[John Larkin]

On Thu, 13 Aug 2020 18:24:32 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

(Forked from the debouncer thread)

On 2020-08-13 16:26, John Larkin wrote:
On Thu, 13 Aug 2020 12:43:51 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 12:06, jlarkin@highlandsniptechnology.com wrote:
On Thu, 13 Aug 2020 11:24:05 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 06:24, Don Y wrote:
On 8/13/2020 2:43 AM, Pimpom wrote:
On 8/13/2020 12:18 PM, Don Y wrote:
On 8/12/2020 11:22 PM, Pimpom wrote:
On 8/12/2020 9:13 PM, jlarkin@highlandsniptechnology.com
wrote:
Why do you need to debounce?

Nothing specific at the moment. I just want to have a stock
standalone solution for future applications.

So, you\'re going to FIX the cost and capabilities of that
\"solution\" without concern for the needs of those \"future
applications\"???

shakes head

I don\'t understand the head shaking. Anyone who designs
circuits regularly will have their favourite solution for a
common task. I\'ve used various debouncing techniques but they
all require passive components, a particular type of switch,
and in some cases another active device to complement the main
active devices.

If there\'s an inexpensive standalone part that needs no
external parts and can replace those techniques in most
applications, what\'s wrong with using that as a stock
solution? A 2N3904/BC547 transistor can be used at the heart of
a wide range of low frequency low power applications. Why hunt
for a suitable type every time?

What do you do when you need a greater Icc? Do you have your
\"favorite FET\"?

I sure do. Besides the late lamented BF862 (of which I have
several reels), there\'s the CPH3910 and my new fave, the Mini
Circuits SAV-551+, which (with a bit of circuit magic) makes the
world\'s finest bootstraps.


SAV-551 is a great switch to ground too. 2 ohms, half a pF. Good for
steering current, discharging ramps, changing gain, or switching
caps in and out. It only needs a half volt or so of gate swing, but
you can drive it from bigger stuff with just a series gate resistor.

Have you tried the new 18-GHz Renesas pHEMT parts as switches? They
wouldn\'t have much chance to oscillate in that service.

I didn\'t know about them. Got a part number that you like?

I haven\'t used them yet, but I\'ll get some to try.

There are several nice ones here, and DK has zillions of them.

https://www.digikey.com/short/zrqbt3

Cheers

Phil Hobbs

Here\'s a thing I did as the NEC parts went EOL.

https://www.dropbox.com/s/81lyion9ozh6pqj/Phemts_Jan_2017.jpg?raw=1

Most every possible permutation! I should add the MiniCircuits parts.

What are good Renesas part numbers?

John

 

[Phil Hobbs]

On 2020-08-13 18:50, John Larkin wrote:

On Thu, 13 Aug 2020 18:24:32 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

(Forked from the debouncer thread)

On 2020-08-13 16:26, John Larkin wrote:
On Thu, 13 Aug 2020 12:43:51 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 12:06, jlarkin@highlandsniptechnology.com wrote:
On Thu, 13 Aug 2020 11:24:05 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 06:24, Don Y wrote:
On 8/13/2020 2:43 AM, Pimpom wrote:
On 8/13/2020 12:18 PM, Don Y wrote:
On 8/12/2020 11:22 PM, Pimpom wrote:
On 8/12/2020 9:13 PM, jlarkin@highlandsniptechnology.com
wrote:
Why do you need to debounce?

Nothing specific at the moment. I just want to have a stock
standalone solution for future applications.

So, you\'re going to FIX the cost and capabilities of that
\"solution\" without concern for the needs of those \"future
applications\"???

shakes head

I don\'t understand the head shaking. Anyone who designs
circuits regularly will have their favourite solution for a
common task. I\'ve used various debouncing techniques but they
all require passive components, a particular type of switch,
and in some cases another active device to complement the main
active devices.

If there\'s an inexpensive standalone part that needs no
external parts and can replace those techniques in most
applications, what\'s wrong with using that as a stock
solution? A 2N3904/BC547 transistor can be used at the heart of
a wide range of low frequency low power applications. Why hunt
for a suitable type every time?

What do you do when you need a greater Icc? Do you have your
\"favorite FET\"?

I sure do. Besides the late lamented BF862 (of which I have
several reels), there\'s the CPH3910 and my new fave, the Mini
Circuits SAV-551+, which (with a bit of circuit magic) makes the
world\'s finest bootstraps.


SAV-551 is a great switch to ground too. 2 ohms, half a pF. Good for
steering current, discharging ramps, changing gain, or switching
caps in and out. It only needs a half volt or so of gate swing, but
you can drive it from bigger stuff with just a series gate resistor.

Have you tried the new 18-GHz Renesas pHEMT parts as switches? They
wouldn\'t have much chance to oscillate in that service.

I didn\'t know about them. Got a part number that you like?

I haven\'t used them yet, but I\'ll get some to try.

There are several nice ones here, and DK has zillions of them.

https://www.digikey.com/short/zrqbt3

Cheers

Phil Hobbs


Here\'s a thing I did as the NEC parts went EOL.

https://www.dropbox.com/s/81lyion9ozh6pqj/Phemts_Jan_2017.jpg?raw=1

Most every possible permutation! I should add the MiniCircuits parts.

What are good Renesas part numbers?

John

Check out the link--it\'s a search containing all the CEL/Renesas parts.
(I\'ve never quite understood the relationship between CEL and NEC/Renesas.)

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[John Larkin]

On Thu, 13 Aug 2020 18:56:06 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 18:50, John Larkin wrote:
On Thu, 13 Aug 2020 18:24:32 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

(Forked from the debouncer thread)

On 2020-08-13 16:26, John Larkin wrote:
On Thu, 13 Aug 2020 12:43:51 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 12:06, jlarkin@highlandsniptechnology.com wrote:
On Thu, 13 Aug 2020 11:24:05 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-08-13 06:24, Don Y wrote:
On 8/13/2020 2:43 AM, Pimpom wrote:
On 8/13/2020 12:18 PM, Don Y wrote:
On 8/12/2020 11:22 PM, Pimpom wrote:
On 8/12/2020 9:13 PM, jlarkin@highlandsniptechnology.com
wrote:
Why do you need to debounce?

Nothing specific at the moment. I just want to have a stock
standalone solution for future applications.

So, you\'re going to FIX the cost and capabilities of that
\"solution\" without concern for the needs of those \"future
applications\"???

shakes head

I don\'t understand the head shaking. Anyone who designs
circuits regularly will have their favourite solution for a
common task. I\'ve used various debouncing techniques but they
all require passive components, a particular type of switch,
and in some cases another active device to complement the main
active devices.

If there\'s an inexpensive standalone part that needs no
external parts and can replace those techniques in most
applications, what\'s wrong with using that as a stock
solution? A 2N3904/BC547 transistor can be used at the heart of
a wide range of low frequency low power applications. Why hunt
for a suitable type every time?

What do you do when you need a greater Icc? Do you have your
\"favorite FET\"?

I sure do. Besides the late lamented BF862 (of which I have
several reels), there\'s the CPH3910 and my new fave, the Mini
Circuits SAV-551+, which (with a bit of circuit magic) makes the
world\'s finest bootstraps.


SAV-551 is a great switch to ground too. 2 ohms, half a pF. Good for
steering current, discharging ramps, changing gain, or switching
caps in and out. It only needs a half volt or so of gate swing, but
you can drive it from bigger stuff with just a series gate resistor.

Have you tried the new 18-GHz Renesas pHEMT parts as switches? They
wouldn\'t have much chance to oscillate in that service.

I didn\'t know about them. Got a part number that you like?

I haven\'t used them yet, but I\'ll get some to try.

There are several nice ones here, and DK has zillions of them.

https://www.digikey.com/short/zrqbt3

Cheers

Phil Hobbs


Here\'s a thing I did as the NEC parts went EOL.

https://www.dropbox.com/s/81lyion9ozh6pqj/Phemts_Jan_2017.jpg?raw=1

Most every possible permutation! I should add the MiniCircuits parts.

What are good Renesas part numbers?

John

Check out the link--it\'s a search containing all the CEL/Renesas parts.
(I\'ve never quite understood the relationship between CEL and NEC/Renesas.)

Cheers

Phil Hobbs

Oh, the CEL parts are really Renesas?

We use the CE3514.

Does MiniCircuits make (or have fabbed) the SAV parts, or are they
rebrands?