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They seem to be getting obsolete. Maybe I can cheat and use a regular
pn diode.
They seem to be getting obsolete.
"Phil Allison" wrote in message
news:acb28799-dea8-4e75-8aa8-a6fae2937117@googlegroups.com...
John Larkin wrote:
They seem to be getting obsolete.
** On which planet ?
The on-line catalogs are full of them.
The world of RF lives on them.
On Wednesday, April 1, 2020 at 12:02:21 PM UTC-7, John Larkin wrote:
They seem to be getting obsolete. Maybe I can cheat and use a regular
pn diode.
I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't
seen it done.
They seem to be getting obsolete. Maybe I can cheat and use a regular
pn diode.
I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't
seen it done.
Standard technique in ASIC design
-- Kevin Aylward
http://www.anasoft.co.uk - SuperSpice
http://www.kevinaylward.co.uk/ee/index.html
On Wednesday, April 1, 2020 at 12:02:21 PM UTC-7, John Larkin wrote:
They seem to be getting obsolete. Maybe I can cheat and use a regular
pn diode.
I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't
seen it done.
John Larkin wrote:
-----------------------
They seem to be getting obsolete.
** On which planet ?
The on-line catalogs are full of them.
The world of RF lives on them.
..... Phil
There are pots of low-pF ones on Digikey. The 1000-pFish ones (MVAM108I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't
seen it done.
Standard technique in ASIC design
-- Kevin Aylward
http://www.anasoft.co.uk - SuperSpice
http://www.kevinaylward.co.uk/ee/index.html
Cool. I should have googled it first, there's a few examples out there.
On Wed, 1 Apr 2020 12:39:39 -0700 (PDT), sea moss
danluster81@gmail.com> wrote:
On Wednesday, April 1, 2020 at 12:02:21 PM UTC-7, John Larkin wrote:
They seem to be getting obsolete. Maybe I can cheat and use a regular
pn diode.
I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't seen it done.
I need a small range, maybe a change of 0.2 pF over 5 volts bias
swing. The c-b junction of some small transistor might work. I think
varicaps have special doping profiles to tune the c-v curve, but I'll
be working at fairly high voltages, 10V maybe, and that looks to be
out of the hyperabrupt zone. I'd like a constant voltage-frequency
curve, but that ain't going to happen.
I'm tuning a 150 MHz LC oscillator a few thousand PPM, part of a
bizarre digital PLL.
Looks like I can get some low-capacitance Skyworks singles in SC79.
On Wednesday, April 1, 2020 at 12:02:21 PM UTC-7, John Larkin wrote:
They seem to be getting obsolete. Maybe I can cheat and use a regular
pn diode.
I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't seen it done.
I need a small range, maybe a change of 0.2 pF over 5 volts bias
swing. The c-b junction of some small transistor might work.
On 2020-04-01 16:20, sea moss wrote:
I wonder if it's practical to use a MOSFET's Coss as a varicap. I haven't
seen it done.
Standard technique in ASIC design
-- Kevin Aylward
http://www.anasoft.co.uk - SuperSpice
http://www.kevinaylward.co.uk/ee/index.html
Cool. I should have googled it first, there's a few examples out there.
There are pots of low-pF ones on Digikey. The 1000-pFish ones (MVAM108
etc.) are long gone, and the tens-to-hundreds range is declining. My
fave MV209 is a distant memory, but BB201s are still in stock.
Cheers
Phil Hobbs
Up to about 30pf they'll likely remain. Skyworks and such. Those with
large capacitances lost their market.
They seem to be getting obsolete.
... Maybe I can cheat and use a regular
pn diode.
Joerg wrote:
-------------
Up to about 30pf they'll likely remain. Skyworks and such. Those with
large capacitances lost their market.
** AM radio has disappeared ??
News to me.
Up to about 30pf they'll likely remain. Skyworks and such. Those with
large capacitances lost their market.
** AM radio has disappeared ??
News to me.
My car doesn't even receive AM,
But no AM radio. think they could do that 100% in software if they wanted to. It's only 1600 kHz max frequency.
Rick C is the Centre of his own Universe wrote:
--
Up to about 30pf they'll likely remain. Skyworks and such. Those with
large capacitances lost their market.
** AM radio has disappeared ??
News to me.
My car doesn't even receive AM,
** So misses out on 4000 or so stations in the US alone.
AM broadcast will never disappear, it's just too damn useful.
Sirius XM and Slacker Internet radio.
** How rediculous.
But no AM radio. think they could do that 100% in software if they wanted to. It's only 1600 kHz max frequency.
** Only a snowflake, code scribbler could think that was smart.
Can only think in 1s and 0s.
** So misses out on 4000 or so stations in the US alone.
AM broadcast will never disappear, it's just too damn useful.