Hi guys, I need a little digital pulse stretcher. I've got pulses that are 5ns to 25ns in width, and I'd like to bump them all up to all be at least 10ns. I've got a few spare 74HC14 inverters. I was thinking of just feeding one through a diode followed by an R/C to ground. Any other ways? There might be an extra AND gate too. (not my circuit so I'm not quite sure.) Thanks George H. (and who ordered the second t in stretcher)
Simple pulse stretcher
Started by ●March 7, 2013
Reply by ●March 7, 20132013-03-07
On Thu, 7 Mar 2013 10:21:33 -0800 (PST), George Herold <gherold@teachspin.com> wrote:>Hi guys, I need a little digital pulse stretcher. I've got pulses >that are 5ns to 25ns in width, and I'd like to bump them all up to all >be at least 10ns. I've got a few spare 74HC14 inverters. I was >thinking of just feeding one through a diode followed by an R/C to >ground. Any other ways? There might be an extra AND gate too. >(not my circuit so I'm not quite sure.) > >Thanks > >George H. >(and who ordered the second t in stretcher)Isn't 10ns width just a wee-bit tight for 74HC parts? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●March 7, 20132013-03-07
George Herold wrote:> Hi guys, I need a little digital pulse stretcher. I've got pulses > that are 5ns to 25ns in width, and I'd like to bump them all up to all > be at least 10ns. I've got a few spare 74HC14 inverters. I was > thinking of just feeding one through a diode followed by an R/C to > ground. Any other ways? There might be an extra AND gate too. > (not my circuit so I'm not quite sure.) >The diode thing is what I usually do. But 10nsec through a 74HC14? Now that's a strrrrretch. -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●March 7, 20132013-03-07
On Mar 7, 1:33=A0pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My- Web-Site.com> wrote:> On Thu, 7 Mar 2013 10:21:33 -0800 (PST), George Herold > > <gher...@teachspin.com> wrote: > >Hi guys, =A0I need a little digital pulse stretcher. =A0I've got pulses > >that are 5ns to 25ns in width, and I'd like to bump them all up to all > >be at least 10ns. =A0 I've got a few spare 74HC14 inverters. =A0I was > >thinking of just feeding one through a diode followed by an R/C to > >ground. =A0Any other ways? =A0There might be an extra AND gate too. > >(not my circuit so I'm not quite sure.) > > >Thanks > > >George H. > >(and who ordered the second t in stretcher) > > Isn't 10ns width just a wee-bit tight for 74HC parts? > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ==A0 =A0 ...Jim Thompson> -- > | James E.Thompson =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ==A0 =A0 =A0 | =A0 =A0mens =A0 =A0 |> | Analog Innovations =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ==A0 =A0 | =A0 =A0 et =A0 =A0 =A0|> | Analog/Mixed-Signal ASIC's and Discrete Systems =A0| =A0 =A0manus =A0 ==A0|> | Phoenix, Arizona =A085048 =A0 =A0Skype: Contacts Only =A0| =A0 =A0 =A0 ==A0 =A0 =A0 |> | Voice:(480)460-2350 =A0Fax: Available upon request | =A0Brass Rat =A0| > | E-mail Icon athttp://www.analog-innovations.com| =A0 =A01962 =A0 =A0 | > > I love to cook with wine. =A0 =A0 Sometimes I even put it in the food.OK, maybe I should stretch to 20 ns. George H.
Reply by ●March 7, 20132013-03-07
On Mar 7, 1:34=A0pm, Joerg <inva...@invalid.invalid> wrote:> George Herold wrote: > > Hi guys, =A0I need a little digital pulse stretcher. =A0I've got pulses > > that are 5ns to 25ns in width, and I'd like to bump them all up to all > > be at least 10ns. =A0 I've got a few spare 74HC14 inverters. =A0I was > > thinking of just feeding one through a diode followed by an R/C to > > ground. =A0Any other ways? =A0There might be an extra AND gate too. > > (not my circuit so I'm not quite sure.) > > The diode thing is what I usually do. But 10nsec through a 74HC14? Now > that's a strrrrretch. > > -- > Regards, Joerg > > http://www.analogconsultants.com/OK thanks, I'll do 20ns then. George H.
Reply by ●March 7, 20132013-03-07
George Herold wrote:> On Mar 7, 1:34 pm, Joerg <inva...@invalid.invalid> wrote: >> George Herold wrote: >>> Hi guys, I need a little digital pulse stretcher. I've got pulses >>> that are 5ns to 25ns in width, and I'd like to bump them all up to all >>> be at least 10ns. I've got a few spare 74HC14 inverters. I was >>> thinking of just feeding one through a diode followed by an R/C to >>> ground. Any other ways? There might be an extra AND gate too. >>> (not my circuit so I'm not quite sure.) >> The diode thing is what I usually do. But 10nsec through a 74HC14? Now >> that's a strrrrretch. >> >> -- >> Regards, Joerg >> >> http://www.analogconsultants.com/ > > OK thanks, I'll do 20ns then. >Still a bit of a stretch but if you need pulses this short there are faster versions of the HC14. -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●March 7, 20132013-03-07
On Thu, 7 Mar 2013 10:21:33 -0800 (PST), George Herold <gherold@teachspin.com> wrote:>Hi guys, I need a little digital pulse stretcher. I've got pulses >that are 5ns to 25ns in width, and I'd like to bump them all up to all >be at least 10ns. I've got a few spare 74HC14 inverters. I was >thinking of just feeding one through a diode followed by an R/C to >ground. Any other ways? There might be an extra AND gate too. >(not my circuit so I'm not quite sure.) > >Thanks > >George H. >(and who ordered the second t in stretcher)Why not use a one-shot? HC123 or the faster Tiny version of same, SN74LVC1G123. The other way is to set a D-flop that resets itself. That can be a lot faster. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●March 7, 20132013-03-07
On Thu, 7 Mar 2013 11:01:25 -0800 (PST), George Herold <gherold@teachspin.com> wrote:>On Mar 7, 1:33�pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My- >Web-Site.com> wrote: >> On Thu, 7 Mar 2013 10:21:33 -0800 (PST), George Herold >> >> <gher...@teachspin.com> wrote: >> >Hi guys, �I need a little digital pulse stretcher. �I've got pulses >> >that are 5ns to 25ns in width, and I'd like to bump them all up to all >> >be at least 10ns. � I've got a few spare 74HC14 inverters. �I was >> >thinking of just feeding one through a diode followed by an R/C to >> >ground. �Any other ways? �There might be an extra AND gate too. >> >(not my circuit so I'm not quite sure.) >> >> >Thanks >> >> >George H. >> >(and who ordered the second t in stretcher) >> >> Isn't 10ns width just a wee-bit tight for 74HC parts? >> >> � � � � � � � � � � � � � � � � � � � � ...Jim Thompson >> -- >> | James E.Thompson � � � � � � � � � � � � � � � � | � �mens � � | >> | Analog Innovations � � � � � � � � � � � � � � � | � � et � � �| >> | Analog/Mixed-Signal ASIC's and Discrete Systems �| � �manus � �| >> | Phoenix, Arizona �85048 � �Skype: Contacts Only �| � � � � � � | >> | Voice:(480)460-2350 �Fax: Available upon request | �Brass Rat �| >> | E-mail Icon athttp://www.analog-innovations.com| � �1962 � � | >> >> I love to cook with wine. � � Sometimes I even put it in the food. > >OK, maybe I should stretch to 20 ns. > >George H....Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●March 7, 20132013-03-07
On Thu, 7 Mar 2013 11:01:25 -0800 (PST), George Herold <gherold@teachspin.com> wrote:>On Mar 7, 1:33�pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My- >Web-Site.com> wrote: >> On Thu, 7 Mar 2013 10:21:33 -0800 (PST), George Herold >> >> <gher...@teachspin.com> wrote: >> >Hi guys, �I need a little digital pulse stretcher. �I've got pulses >> >that are 5ns to 25ns in width, and I'd like to bump them all up to all >> >be at least 10ns. � I've got a few spare 74HC14 inverters. �I was >> >thinking of just feeding one through a diode followed by an R/C to >> >ground. �Any other ways? �There might be an extra AND gate too. >> >(not my circuit so I'm not quite sure.) >> >> >Thanks >> >> >George H. >> >(and who ordered the second t in stretcher) >> >> Isn't 10ns width just a wee-bit tight for 74HC parts? >> >> � � � � � � � � � � � � � � � � � � � � ...Jim Thompson >> -- >> | James E.Thompson � � � � � � � � � � � � � � � � | � �mens � � | >> | Analog Innovations � � � � � � � � � � � � � � � | � � et � � �| >> | Analog/Mixed-Signal ASIC's and Discrete Systems �| � �manus � �| >> | Phoenix, Arizona �85048 � �Skype: Contacts Only �| � � � � � � | >> | Voice:(480)460-2350 �Fax: Available upon request | �Brass Rat �| >> | E-mail Icon athttp://www.analog-innovations.com| � �1962 � � | >> >> I love to cook with wine. � � Sometimes I even put it in the food. > >OK, maybe I should stretch to 20 ns. > >George H.What I was driving at was how can the 74HC do the stretch in the first place... reliably. Though I think I possibly see a way. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●March 7, 20132013-03-07
On 3/7/2013 12:21 PM, George Herold wrote:> Hi guys, I need a little digital pulse stretcher. I've got pulses > that are 5ns to 25ns in width, and I'd like to bump them all up to all > be at least 10ns. I've got a few spare 74HC14 inverters. I was > thinking of just feeding one through a diode followed by an R/C to > ground. Any other ways? There might be an extra AND gate too. > (not my circuit so I'm not quite sure.) > > Thanks > > George H. > (and who ordered the second t in stretcher) >Something like this: http://www.abvolt.com/misc/pulse_stretch.jpg You got the idea. /* Placeholder for banal comments */ Vladimir Vassilevsky DSP and Mixed Signal Designs www.abvolt.com
