Sign in
Search Sci.Electronics.Design
design by Keywords
8051 | Amplifier | AVR | CMOS | Converter | DAC | Diode | FPGA | GPS | I2C | IDE | Laser | LCD | MOSFET | Op-amp | Oscillator | Oscilloscope | PID | PLL | PSU | PWM | RFID | RS232 | RS485 | SMPS | Spice | Transformer | Transistor | TTL | USB | VCO
Ads
See Also
CMOS
Sci.Electronics.Design is a worldwide Usenet news group that is used to discuss various aspects of Electronic Circuit Design.
We found 467 threads matching "cmos"
You are looking at page 1 of 12.
The most relevant threads are listed first
inverted cmos?
Jon Slaughter - 2008-04-15 06:30:00
I need to use cmos + invert the signal. I tried to put the nch mosfet on top
and the pch on bottom. This does work except the output does not swing rail
to rail. I assume this has to do with the finite resistances in the mosfets?
I think it will work for my app because I have a few volts to s...
Re: ON TOPIC... Circuit Design
Joel Koltner - 2010-01-13 11:40:00
Did that design make it through fab, Jim, or did the company start imploding
first?
I thought that combined bipolar/CMOS ("BiFET?") processes were generally
considered too exotic/unnecessary-due-to-performance-improvements-in-CMOS
these days? Not so?
---Joel
...CMOS OpAmp Design
2008-12-16 02:29:00
Hi,
I was looking for a CMOS OpAmp circuit which doesnt need need any
special Common Mode Feedback circuit for stabilizing the bias point.
Anybody has come across a circuit like that ?
Please let me know
regards
Jean
...Query about designing a linear amplifier using CMOS inverter
Mandar - 2008-01-05 11:50:00
Hi everyone,
Here I have a problem in using CMOS inverter as an amplifier.
What should be the consideration while choosing the resistance value
of the feedback resistor?
I very well know that, it should be of order of few megaohms, but how
many megaohms? Please help.
Thank you.
...CMOS for driving MOSFETS?
Jon Slaughter - 2008-04-13 00:56:00
Why not use smaller mosfets to drive larger mosfet gates? One could put them
in the same package so that logic level signals could be used to drive large
mosfets? I'm thinking of implementing that idea discretely but maybe there
is a reason for it? (although its going to cost me about 2x the #...Re: diode temperature model
Phil Hobbs - 2009-12-22 14:55:00
On 8/29/2009 10:42 AM, Jim Thompson wrote:
> > > > > > > "Michael Robinson" wrote in message
Since we're on voltage references, I notice that LTC has a really nice
CMOS bandgap--the LTC6655--with ...Silicon CMOS oscillator at 430 GHz
Jan Panteltje - 2008-02-07 06:59:00
Silicon CMOS oscillator at 430 GHz
http://www.sys-con.com/read/497124.htm
...Re: MAx232 unused inputs
Rich Webb - 2010-01-06 08:18:00
On Wed, 6 Jan 2010 04:54:29 -0800 (PST), lighthouseman
wrote:
> Here's a nice simple one for you....
> If my design has 5 CMOS serial ports, and I use something like 3 x
> MAX232, which have 2 drivers/receivers on each chip, then what should
> I do with the unused inputs/outputs on the 3rd...cmos 74hc debounce pull up resistors
usao - 2008-02-26 14:49:00
I am looking to use a SPDT switch (center GND) with the NO and NC
contacts wired to the inputs of a 74HC00 CMOS NAND gates.
Is it necessary to tie both (NO and NC) inputs to power through a pull-
up resistor? I have seen this done on TTL circuits, but I thought that
the inputs on the CMOS had su...Using CMOS logic for amplifying small signals
Mr. B - 2008-01-04 11:48:00
Something has occurred to me, and I was wondering if anyone knew more about
this. Could a CMOS logic inverter, like a 4049, be used as a very high
gain amplifier if it were properly biased? I figured that the DC offset
should be set at just about half the supply voltage, so that the gate was
a...TLC556 (CMOS 555 Timer) Question.
RFI-EMI-GUY - 2008-09-08 16:56:00
I am building a prototype using a CMOS 556 (dual 555 timer)and intend to
leave off the parts for the second timer at this time. (I will add them
later after some more breadboarding.) For the time being, what pins do I
have to jumper to make sure the timer doesn't oscillate or draw too much
c...Re: Audio Design
MooseFET - 2009-09-03 09:58:00
On Sep 2, 6:15=A0pm, "m...@sushi.com" wrote:
[....]
> I don't have a problem with money spent of advertising, but seriously,
> these marketing departments are often total bloat.
Often "marketing" does damage beyond just wasted money. Do you
remember that one company had an ad with the p...Meaning of "dynamic clock"?
Tim Williams - 2009-01-03 04:03:00
What does it mean when a processor has a dynamic clock? 8086 for instance.
I notice, also, that many chips are (or were) available in HMOS and CMOS,
and the CMOS versions were static (could be clocked arbitrarily slowly).
Why the difference?
Also, what happens when you clock something too...Re: reg + reference
krw@att.bizzzzzzzzzzzz - 2010-04-01 18:52:00
On Thu, 01 Apr 2010 09:27:59 -0400, Phil Hobbs
wrote:
> On 3/31/2010 11:53 PM, krw@att.bizzzzzzzzzzzz wrote:
> > On Wed, 31 Mar 2010 22:14:16 -0500, "Tim Williams"
> > wrote:
> >
> > > "John Larkin" wrote in message
> > > news:2vt7r5p5qcrd78neuabj8b9gu837pecbt2@4ax.com...
> > ...Re: effect of xray on fpga electronic circuits
krw - 2008-01-17 21:14:00
In article , sci.electronics.design,
kurtulmehtap@gmail.com says...
> Dear All,
> As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affec...Mixed-Signal, Bipolar vs CMOS
Jim Thompson - 2010-01-19 13:01:00
Mixed-Signal, Bipolar vs CMOS....
http://electronicdesign.com/tabid/57/default.aspx?topic=three_industry_leaders_track_analog_chip_trends&catpath=&fltrTitle=&fltrSummary=&fltrPublication=?nl=1
...Jim Thompson
--
| James E.Thompson, CTO ...Re: Blue LED at 3.3V
John Larkin - 2010-05-29 01:06:00
On Fri, 28 May 2010 19:56:36 -0400, Bitrex
wrote:
>
> > Bitrex's circuit likes an asymmetric duty cycle, which is maybe why he
> > has the thresholds where they are. The asymmetry struck me
> > immediately, because an HC gate oscillator would be nearly symmetric.
> >
>
> I'm stil...Re: Feedback resistor in CMOS Xtal oscillator.
John Larkin - 2010-04-15 10:16:00
On Wed, 14 Apr 2010 22:45:04 -0700, Robert Baer
wrote:
> pimpom wrote:
> > I'm experimenting with a 32.768kHz oscillator using a watch
> > crystal (no specs) and a CMOS inverter. The current limiting
> > resistor is 330k and the caps are both 15pF. It oscillates with
> > 4.7-10Meg ...Anyone know a good semi-custom transistor array vendor?
Frank Raffaeli - 2008-03-09 12:20:00
I'm looking for a product - similar to the semi-custom transistor
arrays Cherry Semiconductor (now ON) or GEC/Plessey used to have back
in the early 90's: an array with hundreds of transistors, with some
larger devices around the periphery. They had some cross-unders and
some resistors too. I'd ...High to Low voltage shifter
2009-05-26 22:48:00
I am designing a CMOS Schematic in which there are both 3.3 V and 1.2
V power(0.13 um process). So when the data or clock is transferred
from the 3.3V circuit to the 1.2 V circuit, I need to scale down the
maximum Voltage of the data from 3.3 V to 1.2 V.
Since 1.2V is not too low, I decided to...Re: Blue LED at 3.3V
John Larkin - 2010-05-30 20:43:00
On Sun, 30 May 2010 19:14:34 -0500, John Fields
wrote:
> On Fri, 28 May 2010 22:06:53 -0700, John Larkin
> wrote:
>
> > On Fri, 28 May 2010 19:56:36 -0400, Bitrex
> > wrote:
> >
> > >
> > > > Bitrex's circuit likes an asymmetric duty cycle, which is maybe why he
> > > > has...Are TS555's really supposed to suck this much?
Tim Williams - 2010-01-20 23:22:00
I was trying to blink LEDs from a TS555IN today, and discovered the
awful truth that its output stage stinks. Somehow it's rated for 10mA
source, 50mA sink (at 12V, 2V max. Vds(sat)). The datasheet happens
to overlook the fact that internal voltages change when the output is
loaded. Specifica...Re: Looking for Analog Switch with single supply
Nico Coesel - 2009-10-16 13:38:00
"Joey.G" wrote:
> On Oct 16, 2:06=A0pm, Spehro Pefhany
> wrote:
> > On Thu, 15 Oct 2009 19:32:53 -0700 (PDT), "Joey.G"
> >
> > wrote:
> > > Hi All,
> >
> > > What can you suggest. I'm looking an analog switch with Vin to +-4v
> > > input =A0on a single supply 5V to 12V.
>...Re: Audio VCO design
Rich Grise - 2009-11-23 17:38:00
On Fri, 20 Nov 2009 14:14:56 -0800, whit3rd wrote:
> On Nov 20, 1:39 am, David Chapman wrote:
> > As part of a larger system, I need to design and build an audio VCO
> > which will produce tones ranging from around 50Hz to 4KHz or so when the
> > applied DC input voltage changes from...Re: Anyone Seen This XP Quirk?
Jim Thompson - 2008-05-21 10:34:00
On Tue, 20 May 2008 20:38:30 -0700 (PDT), mpm
wrote:
[snip non-existent being]
>
> And now you have shown us yet another shortcoming in your
> understanding of modern electronics:
> Integrated circuit GEMOETRY dictates voltage and speed, not your
> imaginary notion that it takes longer ...Re: OT: The Truth About Predator Drones
glen herrmannsfeldt - 2009-12-19 15:10:00
In comp.dsp Archimedes' Lever wrote:
(snip)
> Today's modern CPUs put out less heat per cycle
Right units. I believe it is true compared to NMOS processors,
maybe not to early CMOS processors. NMOS uses a pull-up resistor
and dissipates power independent of clocking. CMOS pretty mu...Re: Parrot Clip Test Probes
John Fields - 2010-07-29 05:52:00
On Wed, 28 Jul 2010 14:22:47 -0700, "CIC" wrote:
> Thank you Joel for your kindness,
>
> Depends if you are in US or not... and how fast you want them... freedom of
> choice. Just letting some of the the guys know about them... Besides
> answering and helping some of the guys with their...Re: Buffered FET logic, Direct coupled FET logic tutorial
Tim Williams - 2010-08-11 15:37:00
"John Larkin" wrote in
message news:gcq566pvub8jtqbtirn8oiu6s0rbt5ge1s@4ax.com...
> Like GaAs DCFL, the GigaLogic stuff? That was depletion load, I think,
> like old-old NMOS stuff. Power hog.
Yuck, GaAs logic. It sounds like a good idea, until your signal has to
change back.
Silic...Re: HP 5316A opinion
2009-09-25 16:08:00
A used Jupiter GPS + a 6$ VCXO from ebay + some CMOS as a PLL= WOW.
I did buy a used Rb fo 65$ a while back.
So if the counter has a external REF in ar 5 or 10 Mhz, buy it....
Steve
...Re: Switching of crystals in crystal oscillator using a 74HC4316 ??
Robert Baer - 2009-03-12 03:11:00
sparks wrote:
> Hi,
> Ive got a radio that has rotary switch selection of crystals for the
> 1st local oscillator.
> I want to have electronic selection, where I can change the crystal
> selected by use of control lines.
> Can I use something like the 74HC4316 to do this without stuffing...About CMOS Sensors SNR estimation
kyori - 2008-05-07 07:52:00
Hi,
I wonder how to calculate the Signal-to-Noise Ratio with the datasheet
of a CMOS sensor?
I calculate the total excited photons (Signal_N) from the irradiance,
conversion gain and quantum efficiency.
But, I am confused with the noise estimation.
The datasheet gives,
Parameter ...Re: EMI prevention / protection?
George Herold - 2009-10-30 13:06:00
On Oct 30, 11:50=A0am, "dave.harper" wrote:
> It's a MCP601, which is a CMOS op amp. =A0Would going to a J-FET op amp
> be a big improvement over a CMOS?
>
> On Oct 30, 10:14=A0am, George Herold wrote:
>
>
>
> > Dave, Are you using an opamp for the Wein oscillator? =A0Does it ...Testing a TTL chip
2009-02-15 16:39:00
I am trying to figure out if a TTL chip of mine (for my science fair -
see "Vacuum Tube Calculator Schematic" for more) to see if I burned it
out. It's a 7474, and I've connected the ~PRESET inputs directly to
+5V because I do not want to be setting it (only reseting it). Did I
do something wron...Re: Top ten analog engineers
Jim Thompson - 2009-12-23 21:13:00
On Wed, 23 Dec 2009 12:56:10 -0500, Phil Hobbs
wrote:
> Tim Williams wrote:
> > "Jim Thompson"
> > wrote in message news:bft2j5dkctqm7mb0c21cqs2uqdc6v0va2f@4ax.com...
> > > > > It might be amusing to suggest a class (SED lurkers) problem... design
> > > > > (at the CMOS transistor...Re: Audio Design
John Larkin - 2009-09-04 10:29:00
On Fri, 4 Sep 2009 06:54:31 -0700 (PDT), MooseFET
wrote:
> On Sep 3, 9:23 am, John Larkin
> wrote:
> > On Thu, 3 Sep 2009 06:58:32 -0700 (PDT), MooseFET
> > wrote:
> >
> > > On Sep 2, 6:15 pm, "m...@sushi.com" wrote:
> > > [....]
> > > > I don't have a problem with mone...Parasitic charge current into lithium coin cell
2009-03-24 08:13:00
Hi,
Our product uses a CR2032 lithium coin cell as a CMOS battery for an
embedded PC. The cell is OR'ed with a 3.3V supply which becomes
available when the product is powered on, the intention was to extend
the cell life. I think desktop PCs do a similar thing using the standby
power.
...BNL Job: X-Ray Detector Development (Engineering Focus)
Jianming bai - 2007-12-21 19:02:00
X-Ray Detector Development (Engineering Focus)
As part of a project to develop advanced x-ray detectors for x-ray
spectroscopy applications, we are seeking applicants for a two-year
postdoctoral fellowship in low-noise analog integrated circuit
design. The successful candidate will have a Ph.D...Re: 1-wire specification
Mark Zenier - 2010-01-14 15:08:00
In article ,
WangoTango wrote:
> In article , mzenier@eskimo.com says...
> > In article ,
> > WangoTango wrote:
> > ...
> > > I still remember the convoluted spec on the NMOS MC68705P3S port A.
> > > I went something like this :
> > >
> > > "The PORT A pull up option...Re: Cascading two 74LS90's doesn't work (needs deglitching)
Arie - 2008-04-26 07:52:00
"Rocky" wrote in message
news:68d837c4-9528-4982-872f-2d90a7943691@h1g2000prh.googlegroups.com...
> So now I need to alleviate reflections causing the multiple triggers.
> Do people have suggestions as to how I do that ?
ALWAYS use buffers and terminators to drive cables (or "electrical...D82C55AC-2
aleksa - 2008-05-20 15:09:00
I've bought 10 pcs of "82C55" through mail, and received D82C55AC-2.
The problem is that the output high voltage of any pin is not 5V, but
3.8V.
Nothing is connected to the port pins, VCC is 4.85V.
Am I wrong thinking that CMOS chips should have far more than 3.8V on
output pins?
Thank...