1000 Threads found on edaboard.com: Schmitt Trigger Oscillator
For the oscillator circuit to work it must be an inverting schmitt trigger. The 7414 family qualifies.
Electronic Elementary Questions :: 12-31-2011 01:40 :: BradtheRad :: Replies: 5 :: Views: 1427
I have a question about self-oscillation schmitt trigger frequency? Can I get 10 MHz square wave from self-oscillation schmitt trigger. I build up schematic that is given below. Also, I must use LM158. Anyone can give me an idea if it is possible to
Electronic Elementary Questions :: 08-17-2011 03:38 :: OsmanH :: Replies: 4 :: Views: 1189
This doesn't work so what am I doing wrong here? I am getting -2kV or something similarly utterly
Analog Circuit Design :: 08-07-2012 23:58 :: boylesg :: Replies: 22 :: Views: 2223
I tried implementing a schmitt trigger oscillator using orcad 9.
But it does not show the any waveform.just a dc of supply voltage at output
Why is that???
This is my circuit diagram
Hello, all right
I did the same circuit using Orcad 16.6
Electronic Elementary Questions :: 11-20-2014 08:35 :: eletmoraes :: Replies: 3 :: Views: 301
I have a 6MHz noise sine wave signal from an oscillator which I would like to rectify. What would be a suitable schmitt trigger? Can they use analog input signals at this frequency? If so, can someone suggest a part number please.
Analog Circuit Design :: 05-11-2006 07:11 :: svensl :: Replies: 2 :: Views: 1050
i have made a schmitt trigger using CMOS(conventional circuit with 2PMOS and 2NMOS, 1PMOS and 1NMOS in source follwer configuration) with VUTP(Upper Threshold point)=4V and VLTP=2V, with 5V power supply.
It is working vry fine
But wen i tried oscillator using this schmitt trigger(with (...)
Analog Circuit Design :: 09-21-2006 03:28 :: harry_madaan :: Replies: 4 :: Views: 1658
We can see some application material of xstal oscillator that they use
a schmitt trigger to follow the oscillator. What's the reason behind it?
For better noise? better interference immunity?
Analog Circuit Design :: 03-11-2008 10:21 :: OMEsystem :: Replies: 6 :: Views: 3733
I have a CMOS oscillator based on schmitt trigger and a chain of inverters. A capacitor is being charged by a current source. The output of the last inverter is fed to the gate of a NMOS which discharges a capacitor. The output of the last inverter is a series of thin pulses at 720kHz which is fed to the D flip flop to generate a (...)
Analog IC Design and Layout :: 02-17-2011 18:35 :: cmos_ajay :: Replies: 12 :: Views: 1592
RB0 is a TTL input when used as a general purpose IO. Thus, the levels are 0.8V max for LO. 2.0V min for HI.
When you configure it as an interrupt input, it becomes a schmitt trigger input. That is, it has two definite thresholds at which the actual output switching occurs, with a fairly large hysteresis. A schmitt (...)
Microcontrollers :: 10-07-2005 13:24 :: VVV :: Replies: 3 :: Views: 2767
my teacher gave me this
CMOS schmitt trigger DC analysis
Vdd 5 0 dc 5VVin 1 0 dc 1V
m5 2 1 0 0 mn l=1u w=1um4 3 1 2 0 mn l=1u w=2.5um6 5 3 2 0 mn l=1u w=3um1 4 1 5 5 mp l=1u w=1um2 3 1 4 5 mp l=1u w=2.5um3 0 3 4 5 mp l=1u w=3u
,model mn nmos vto=1 gamma=0.4 kp=2.5e-5,model mp pmos vto=-1 gamma
Electronic Elementary Questions :: 11-07-2005 02:06 :: david90 :: Replies: 2 :: Views: 1505
I am using Phillips LPC760 emulator(5V power supply) for schmitt based sine detection.
There are two problems:
1) The schmitt trigger output should follow the following rule as per the LPC760 datasheet:
Vil(Negative going threshold) = -0.5V to 1.5V
Vhl(Positive going threshold) = 3.5V to 5.5V.
However the (...)
Microcontrollers :: 11-22-2005 22:07 :: john2020 :: Replies: 0 :: Views: 611
in a book page 358 ,introduce design of the schmitt trigger,
?A general design rule for selecting the size of M2, that is β2,is to requre that β2≥5β1 and 5β3, since M2 is used as a swith,we requre that it be larger than M1 or M3.?
I donn't understand this completely .Can anyone explain it better?
Analog Circuit Design :: 11-30-2005 08:28 :: holddreams :: Replies: 0 :: Views: 863
anyone know what is function of CA3130 and 40106 schmitt trigger(NOT gate) in the circuit??
if CA3130 is comparatot, then how it compare the digital ouput from ADC with the reference voltage???
can state the condition???
Analog Circuit Design :: 04-18-2006 07:18 :: ahcheong :: Replies: 1 :: Views: 1175
In the following website you will find schmitt triggers build around transistors, gates and opams ..
Choose whichever you like or need ..
Analog Circuit Design :: 07-07-2006 02:53 :: IanP :: Replies: 3 :: Views: 2049
schmitt trigger is for TTL signal:
Vin > 2.0V => logic '1'
Vin < 0.8V => logic '0'
So, schmitt triger is not what you need. Look for something else like voltage comparators w/ hysteresis.
Analog Circuit Design :: 07-14-2006 01:53 :: tlihu :: Replies: 6 :: Views: 1404
schmitt input has different high input threshold and low input voltage
threshold, this will help eliminate some noise at near threshold and
avoid output oscilating.
I would like to know what is schmitt trigger?
How is it differ from a TTL buffer?
For example the microcon
Electronic Elementary Questions :: 09-08-2006 23:32 :: funster :: Replies: 8 :: Views: 6080
Can you guys help me on the following question
What is the relation between a postive feedback resistor and the schmitt trigger bandwidth ? why ?
Analog Circuit Design :: 10-30-2006 01:01 :: ajaykumar988 :: Replies: 0 :: Views: 819
Can you guys help me on the following question
What is the relation between a postive feedback resistor and the schmitt trigger bandwidth ? why ?
Electronic Elementary Questions :: 10-31-2006 01:21 :: ajaykumar988 :: Replies: 1 :: Views: 676
You can actually look in to Digital Integrated Circuits by Rabaey. There you will get a couple of circuits for schmitt triggers and design equations too.
Analog Circuit Design :: 05-16-2007 08:10 :: konqueror :: Replies: 10 :: Views: 1651
I have a question regarding the schmitt trigger . It seems like schmitt trigger is often used in integrated circuit to obtain a steep signal
But a simple inverter can also do this job, to make the output signal have a steep transition
I want to know more about schmitt trigger (...)
Analog IC Design and Layout :: 09-26-2007 13:20 :: JackyH :: Replies: 6 :: Views: 2478
does anyone have a verilogA model for a schmitt trigger.
Analog Circuit Design :: 04-29-2008 22:20 :: nijMcnij :: Replies: 0 :: Views: 924
How to reduce the current for the following schmitt trigger without changing the VLH and
Analog Circuit Design :: 05-12-2008 00:12 :: rampat :: Replies: 3 :: Views: 957
I need a 10ms delay time.
Is it possible to design a delay circuit by using schmitt trigger?
Analog Circuit Design :: 07-19-2008 08:25 :: shaq :: Replies: 5 :: Views: 3618
It is the same. Unless - A schmitt trigger could be designed otherwise too.
ASIC Design Methodologies and Tools (Digital) :: 09-16-2009 16:19 :: Prototyp_V1.0 :: Replies: 6 :: Views: 6296
The various schmitt trigger buffers and inverters that are available have fixed hysteresis. The schmitt trigger is a comparator that has positive feedback to provide its hysteresis (difference between the high and low reference levels). You can build a schmitt trigger from a (...)
Electronic Elementary Questions :: 11-02-2009 11:39 :: Kral :: Replies: 5 :: Views: 2998
I built up a schmitt trigger circuit (attached). I placed an o-scope on the output pin (#3) and saw that my high transitions are clipped whereas my low transitions are not clipped (see 2nd attachment).
My resistor values suggest that a negative transition occurs when a voltage of 4.921V or greater is at +Vin (pin #2).
My resistor values sugge
Analog Circuit Design :: 11-30-2009 13:01 :: robismyname :: Replies: 6 :: Views: 4081
You should consider LPF followed by schmitt trigger ..
Optocoupler only helps when you face problems with ground loops, spikes etc. etc. and you need to provide a barrier ..
Microcontrollers :: 01-24-2010 21:14 :: IanP :: Replies: 1 :: Views: 1747
Gates with schmitt trigger input does switch/compare with some hysterese. These do eliminate some uncertain switchings/spikes in noisy environments...
Added after 2 minutes:
Analog Circuit Design :: 02-14-2010 09:54 :: karesz :: Replies: 1 :: Views: 2180
I was trying to derive the equations for threshold values of a schmitt trigger from the CMOS circuit design and layout book by Jacob Baker.
However, on page 525,
ASIC Design Methodologies and Tools (Digital) :: 03-04-2010 14:07 :: infinitee00 :: Replies: 2 :: Views: 1266
Are there any schmitt triggers which have a dynamic upper and lower threshold voltage???? I want to use a schmitt trigger for an exponentially decreasing ampitude with decreasing frequency signal. The frequency of the signal varies and the amplitude of the signal decreases with lower frequencies... Is there any (...)
Analog Circuit Design :: 03-31-2010 04:52 :: Kinshoro :: Replies: 1 :: Views: 580
Mentioned in most text, the circuit shown below is not suitable for low-voltage applications.
If I am not mistaken, this mean it is not suitable if VDD is low. correct?
How do I calculate the minimum VDD required for this schmitt trigger?
Analog Circuit Design :: 04-20-2010 06:02 :: invent :: Replies: 3 :: Views: 1148
Lab 10: schmitt trigger using the 741 op amp
Analog IC Design and Layout :: 05-11-2010 20:59 :: IanP :: Replies: 1 :: Views: 1977
The o/p of a schmitt trigger will be the clock of a 4017 Decade counter.
But I'm worried that this may affect my calculations of R (in the schmitt trigger) and how to keep the High/Low voltage compatible! Does a simple voltage divider work, a buffer, ..?
Don’t worry, opamp's output is like a voltage source and (...)
Electronic Elementary Questions :: 05-12-2010 22:09 :: IanP :: Replies: 7 :: Views: 2247
what a schmitt trigger? you have a noninverting amplifier with programmable gain factor depending on R2/R1 ratio. if you want use it in nonlinear region the TF threshold voltages completely depend on the opamp upper/lower saturation voltages.
Sorry, but that's wrong!
A schmitt trigger is NOT an amplifier with a gain de
Analog Circuit Design :: 10-10-2010 10:04 :: LvW :: Replies: 6 :: Views: 818
Hi, does anyone know what are the advantages and disadvanatages of schmitt trigger in inverting/non-inverting configuration?
Electronic Elementary Questions :: 05-08-2011 08:48 :: Manchested :: Replies: 2 :: Views: 1679
The switching points of a simple schmitt trigger depend on supply, Vth and transistor ratios: what topology are you using? what are the available Vth's for PMOS and NMOS?
Analog IC Design and Layout :: 05-12-2011 00:47 :: dgnani :: Replies: 4 :: Views: 1512
Does anyone know how to set the initial state of the schmitt trigger?
Analog Circuit Design :: 05-10-2011 19:14 :: Manchested :: Replies: 2 :: Views: 1365
LM358 is a dual OP. It can be operated as a schmitt trigger, but the thresholds depend on the involved resistor values and the supply voltage. You have to refer to specific circuit.
Electronic Elementary Questions :: 05-30-2011 05:01 :: FvM :: Replies: 1 :: Views: 1246
Can we use schmitt trigger inverter to control the pulse width?
Analog Circuit Design :: 06-10-2011 10:01 :: rosaeidi :: Replies: 1 :: Views: 571
- Avoid cross postings
- Why don't you refer first to internet resources known to answer elementary questions? e.g. schmitt trigger - Wikipedia, the free encyclopedia
Electronic Elementary Questions :: 07-13-2011 05:26 :: FvM :: Replies: 1 :: Views: 423
Two comparators and a 555 for a schmitt trigger? You cannot be serious? All you need is a single comparator. schmitt trigger
Digital Signal Processing :: 08-02-2011 03:06 :: keith1200rs :: Replies: 7 :: Views: 1234
For a visualization of the schmitt trigger operation s. this link.
Thank you but the link does not explain the operation of the circuit I have posted.
Could somebody point me to a source where the circuit which I have posted is explained? or could somebody
Analog IC Design and Layout :: 12-15-2011 22:31 :: kokabanga :: Replies: 8 :: Views: 1848
Can anyone please help in designing cmos schmitt trigger circuit using h spice ...
what modification i can do in normal cmos sctmitt trigger ckt to enhance its performance ??
plezz find the attachment of the cmos schmitt trigger for which i want help ..
help me asap ..
Analog Circuit Design :: 05-10-2012 11:52 :: vaibhav mishra :: Replies: 0 :: Views: 571
I am Sudarshan. I amm new to Eagle software.
I need to use PTVS3V3S1UTR (Zenor diode - package - SOD 123W) and 74LVC2G14GW (pacakage - SOT -363). unfortunately I couldnt find them in the eagle library. So is there any way ?
Can I use another devices with same foot print/package ?. For example, my schmitt trigger foot print is SOT 363. I
PCB Routing Schematic Layout software and Simulation :: 06-01-2012 10:32 :: sudarshanliu440 :: Replies: 2 :: Views: 1899
please refer me some good i.c. for making schmitt trigger like circuits for analog to digital convertion etc ?
Hobby Circuits and Small Projects Problems :: 04-11-2013 07:38 :: rajaram04 :: Replies: 4 :: Views: 355
I want to design a schmitt trigger using LM358 with UTP=12V, LTO=10V
This is the diagram given in LM358 datasheet.How will I set the Vref.
Can someone give me the verified design with resistor values.
Vref can be obtained by two voltage divider resistors through (...)
Electronic Elementary Questions :: 05-02-2013 22:13 :: goldsmith :: Replies: 4 :: Views: 1181
i am designing a ir transceiver and i need a schmitt trigger inverter to invert my rx and tx signal which goes to ir emitter and comes from phottransistor.
i found some ic's which are doing this job, but the problem is i need additional transistors to drive emitter and photodiode because the output current is 25mA and i need 100mA,
Analog Circuit Design :: 07-23-2013 16:27 :: adnan_merter :: Replies: 1 :: Views: 235
I have designed a schmitt trigger with bjt, the utp=3.5v and ltp= 1.5V and o/p of schmitt trigger has levels 3.5V and 2.5V. This voltage is to be shifted to 3V and 0.7V respectively, can you plz tell how i can do this.
Electronic Elementary Questions :: 07-29-2013 02:11 :: dveena_das :: Replies: 2 :: Views: 1265
Metastability is caused by violating setup- and hold times, in so far a schmitt trigger can't avoid it.
Hyteresis is the difference between Vth+ and vth-. It may be programmable, but isn't with Cyclone FPGA.
PLD, SPLD, GAL, CPLD, FPGA Design :: 10-23-2013 10:18 :: FvM :: Replies: 3 :: Views: 336
I want to design a non-inverting schmitt trigger circuit with VTL= -8V, VTH=0V and VOH=5V, VOL=0V.
checked in net, the formula given is VTH = R1/R2 * Vsat. But I need VTH to be zero. And im quite confused with the design concept here.
Can somebody pour some light? :) Please explain your approach.
Analog Circuit Design :: 10-31-2013 15:12 :: Pradeepbp :: Replies: 7 :: Views: 595