[NCARC] Meeting Saturday

Sat Mar 16 23:34:41 EDT 2013

 Hi Kevin,

Interesting -- thanks for that info!

My interest in I = C*V*F and P = C*V^2*F is for sizing pulser power supplies, and yours is in IC power consumption based on clocks -- both using pulse or rectangular waveforms.

You're in an interesting business, with power densities approaching that of a nuclear reactor... :-)

Speaking of old times, I designed with the Motorola MC6809 (NMOS) when it first came out, then with the Hitachi HD63B09 (CMOS), and now with a 6309 core inside an FPGA. Fun stuff!

73,

Bob

-----Original Message-----
From: Kevin <wm0f69 at comcast.net>
To: scomind <scomind at aol.com>
Sent: Sat, Mar 16, 2013 7:45 pm
Subject: RE: [NCARC] Meeting Saturday

Bob,
   C*V^2*F where F is in hertz is what we normally used to compute dynamic
power in IC designs.  I designed in both NMOS and CMOS and managed designers
for 35 years.   As IC processes evolved, dynamic power (which is consumed as
logic switches) became just part of total power.  In the last 10 years,
leakage power, which does not correlate strongly to Freq, has become a major
component of total power.  The projects I worked on were micro-processor
designs.  Total power was less important than performance back in the 70's
and 80's.  In the 90's we hit the power wall, and performance per watt
became our primary measure of design success.  That is true today and will
be for the foreseeable future.

73, Kevin WM0F

(feel free to forward this to ncarc if you want)

-----Original Message-----
From: ncarc-bounces at mailman.qth.net [mailto:ncarc-bounces at mailman.qth.net]
On Behalf Of scomind at aol.com
Sent: Saturday, March 16, 2013 7:24 PM
To: ncarc at mailman.qth.net
Subject: Re: [NCARC] Meeting Saturday

 Thanks to everybody who attended! It was fun to show off my "day job" work,
and I hope other club members will continue to make presentations based on
their home projects, work projects, or whatever might be of interest to the
group.

Steve had commented on the "capacitor formula" I = C x V x F, indicating F
should be in radians, not hertz, so I looked it up in The Source Of All
Knowledge (the Internet). Radians are used when calculating current and
power involving AC sinusoids because Xc = 1/(w C) = 1/(2 pi F C). The
pulse-oriented publications show CVF currents with F in hertz, and you'll
mostly find those references in IC and A/D literature because of MOSFET
currents. If anyone else has info on this topic, I'd like to hear about it.

73,

Bob, WA9FBO

-----Original Message-----
From: John at <kb0ne.ars at gmail.com>
Cc: scomind <scomind at aol.com>; ncarc <ncarc at mailman.qth.net>
Sent: Sat, Mar 16, 2013 11:39 am
Subject: Re: [NCARC] Meeting Saturday

Looks like the tent might have been a good idea!    Good crowd.  Good
presentation.

On Fri, Mar 15, 2013 at 5:12 PM, Tim Annable <tim at timannable.com> wrote:

The manager at the golden coral just told me I am not allowed to set
up a tent tonight to ensure a good seat tomorrow.  Just an FYI in case
anyone else was planning on camping out to secure a seat for Bob's
presentation.

Sent from my Verizon Wireless 4G LTE Smartphone

-------- Original message --------
From: scomind at aol.com
Date: 03/15/2013  16:50  (GMT-07:00)
To: ncarc at mailman.qth.net
Subject: [NCARC] Meeting Saturday

 All,

The NCARC breakfast meeting is tomorrow, and -- fair warning! -- I'll
be giving the presentation. Crowds of biblical proportions will
attend, no doubt, so get there early to reserve a seat.

It's called "Capacitance, Inductance, and Exaggeration" because we'll
examine the behavior of itty-bitty amounts of capacitance and
inductance under unusual and highly stressful conditions.

A couple of interesting props will be shown. Since we won't actually
fire anything up, no electrons will be harmed in the production of
this presentation.

See you there!

73,

Bob, WA9FBO

______________________________________________________________
NCARC mailing list
Home: http://mailman.qth.net/mailman/listinfo/ncarc
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:NCARC at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
NCARC mailing list
Home: http://mailman.qth.net/mailman/listinfo/ncarc
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:NCARC at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

-- 
John at KB0NE, amateur radio station

If PRO is the opposite of CON  then PROGRESS must be the opposite of
CONGRESS. 
      ARRRRRRGHHHHH!
This message be sent by me I-Patch.
This e-mail is rife with virus, Trojans, worms and icky stuff.
If you are reading this, then it is too late!
I just can't believe people don't get it........

______________________________________________________________
NCARC mailing list
Home: http://mailman.qth.net/mailman/listinfo/ncarc
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:NCARC at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html