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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: another fast one-shot
Date: Sat, 22 Jun 2024 17:01:16 +1000
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On 22/06/2024 3:20 pm, john larkin wrote:
> On Sat, 22 Jun 2024 13:13:44 +1000, Bill Sloman <bill.sloman@ieee.org>
> wrote:
> 
>> On 14/06/2024 1:31 am, john larkin wrote:
>>> On Thu, 13 Jun 2024 16:03:04 +1000, Bill Sloman <bill.sloman@ieee.org>
>>> wrote:
>>>
>>>> On 13/06/2024 4:11 am, john larkin wrote:
>>>>> On Wed, 12 Jun 2024 17:22:49 -0000 (UTC), Cursitor Doom
>>>>> <cd999666@notformail.com> wrote:
>>>>>
>>>>>> On Wed, 12 Jun 2024 09:33:17 -0700, john larkin wrote:
>>>>>>
>>>>>>> Here's another idea for a fast one-shot. This is the just-apply-money
>>>>>>> version and should get close to 1 ns pulse width and should easily
>>>>>>> trigger at 150 MHz.
>>>>>>>
>>>>>>> https://www.dropbox.com/scl/fi/1okfo8964bw5m53mjmxs6/
>>>>>> Pecl_One_Shot_1.jpg?rlkey=dwus6qjyqsynl2rv6uje2xxtj&raw=1
>>>>>>>
>>>>>>> I can use the other half of the dual comparator elsewhere. This one has
>>>>>>> programmable hysteresis too.
>>>>>>
>>>>>> Exposing my contemptworthy ignorance here no doubt, but what exactly is it
>>>>>> that is fast about this design, John? And what would its application be?
>>>>>
>>>>> It would have a leading-edge prop delay of 350 ps, a minimum pulse
>>>>> width just over 1 ns, and would easily trigger at 150 MHz. Integrated
>>>>> one-shots, xxx123 types, are always terrible, even the obsolete ECL
>>>>> ones.
>>>>>
>>>>> It would be a programmable delay in a number of possible products,
>>>>> including some optical modulators. Just playing right now.
>>>>>
>>>>> More dollars could certainly do something faster, but as long as
>>>>> customers connect boxes with cables, faster isn't worth a lot. Light
>>>>> just moves too slow.
>>>>>
>>>>> Any suggestions for a faster one-shot?
>>>>
>>>> Version 4
>>>> SHEET 1 2924 1040
>>>> WIRE -592 -720 -768 -720
>>>> WIRE 128 -720 -592 -720
>>>> WIRE 304 -720 128 -720
>>>> WIRE 768 -720 304 -720
>>>> WIRE 976 -720 768 -720
>>>> WIRE 1488 -576 1488 -720
>>>> WIRE 128 -560 128 -720
>>>> WIRE 304 -560 304 -720
>>>> WIRE 768 -560 768 -720
>>>> WIRE -592 -384 -592 -720
>>>> WIRE 1072 -368 1072 -400
>>>> WIRE 768 -320 768 -480
>>>> WIRE 960 -320 768 -320
>>>> WIRE 1008 -320 960 -320
>>>> WIRE 128 -288 128 -480
>>>> WIRE 176 -288 128 -288
>>>> WIRE 576 -288 240 -288
>>>> WIRE 768 -208 768 -320
>>>> WIRE 304 -160 304 -480
>>>> WIRE 400 -160 304 -160
>>>> WIRE 576 -160 576 -288
>>>> WIRE 576 -160 480 -160
>>>> WIRE 640 -160 576 -160
>>>> WIRE 704 -160 640 -160
>>>> WIRE -768 -64 -768 -720
>>>> WIRE 128 48 128 -288
>>>> WIRE -272 96 -432 96
>>>> WIRE 64 96 -192 96
>>>> WIRE 640 128 640 -160
>>>> WIRE 304 160 304 -160
>>>> WIRE -432 240 -432 96
>>>> WIRE -768 416 -768 16
>>>> WIRE -768 416 -880 416
>>>> WIRE -736 416 -768 416
>>>> WIRE -592 416 -592 -320
>>>> WIRE -592 416 -736 416
>>>> WIRE -496 416 -592 416
>>>> WIRE -432 416 -432 320
>>>> WIRE -432 416 -496 416
>>>> WIRE 640 416 640 208
>>>> WIRE 640 416 -432 416
>>>> WIRE 1072 416 640 416
>>>> WIRE 128 464 128 144
>>>> WIRE 768 464 768 -112
>>>> WIRE 768 464 128 464
>>>> WIRE -880 496 -880 416
>>>> WIRE 768 496 768 464
>>>> WIRE -736 640 -736 416
>>>> WIRE -496 640 -496 416
>>>> WIRE -736 656 -736 640
>>>> WIRE -736 944 -736 720
>>>> WIRE -496 944 -496 704
>>>> WIRE -496 944 -736 944
>>>> WIRE 304 944 304 240
>>>> WIRE 304 944 -496 944
>>>> WIRE 768 944 768 576
>>>> WIRE 768 944 304 944
>>>> WIRE 1760 944 768 944
>>>> FLAG -880 496 0
>>>> FLAG 960 -320 out
>>>> SYMBOL npn 64 48 R0
>>>> SYMATTR InstName Q1
>>>> SYMATTR Value BFR92A
>>>> SYMBOL npn 704 -208 R0
>>>> SYMATTR InstName Q2
>>>> SYMATTR Value BFR92A
>>>> SYMBOL voltage -768 -80 R0
>>>> WINDOW 123 0 0 Left 0
>>>> WINDOW 39 24 44 Left 2
>>>> SYMATTR SpiceLine Rser=0.1
>>>> SYMATTR InstName V1
>>>> SYMATTR Value 5.0
>>>> SYMBOL voltage -736 624 R0
>>>> WINDOW 123 0 0 Left 0
>>>> WINDOW 39 24 44 Left 2
>>>> SYMATTR SpiceLine Rser=0.1
>>>> SYMATTR InstName V2
>>>> SYMATTR Value 4.5
>>>> SYMBOL voltage -432 224 R0
>>>> WINDOW 123 0 0 Left 0
>>>> WINDOW 39 0 0 Left 0
>>>> SYMATTR InstName V3
>>>> SYMATTR Value PULSE(0 0.2 1n 300p 300p 100p 200n 2)
>>>> SYMBOL res -176 80 R90
>>>> WINDOW 0 0 56 VBottom 2
>>>> WINDOW 3 32 56 VTop 2
>>>> SYMATTR InstName R1
>>>> SYMATTR Value 22
>>>> SYMBOL res 752 480 R0
>>>> SYMATTR InstName R3
>>>> SYMATTR Value 360
>>>> SYMBOL res 112 -576 R0
>>>> SYMATTR InstName R4
>>>> SYMATTR Value 180
>>>> SYMBOL res 624 112 R0
>>>> SYMATTR InstName R5
>>>> SYMATTR Value 43
>>>> SYMBOL res 752 -576 R0
>>>> SYMATTR InstName R6
>>>> SYMATTR Value 180
>>>> SYMBOL res 288 -576 R0
>>>> SYMATTR InstName R2
>>>> SYMATTR Value 1k
>>>> SYMBOL cap 240 -304 R90
>>>> WINDOW 0 0 32 VBottom 2
>>>> WINDOW 3 32 32 VTop 2
>>>> SYMATTR InstName C1
>>>> SYMATTR Value 3.3p
>>>> SYMBOL res 288 144 R0
>>>> SYMATTR InstName R7
>>>> SYMATTR Value 1k2
>>>> SYMBOL res 496 -176 R90
>>>> WINDOW 0 0 56 VBottom 2
>>>> WINDOW 3 32 56 VTop 2
>>>> SYMATTR InstName R13
>>>> SYMATTR Value 43
>>>> SYMBOL cap -608 -384 R0
>>>> SYMATTR InstName C3
>>>> SYMATTR Value 10n
>>>> SYMBOL cap -512 640 R0
>>>> SYMATTR InstName C4
>>>> SYMATTR Value 10n
>>>> TEXT -272 1000 Left 2 !.model BFR92A NPN(IS=0.1213E-15 VAF=30 BF=94.73
>>>> IKF=0.46227  XTB=0 BR=10.729 CJC=946.47E-15 CJE=10.416E-15 TR=1.2744E-9
>>>> TF=26.796E-12  ITF=0.0044601 VTF=0.32861  XTF=0.3817 RB=14.998
>>>> RC=0.13793 RE=0.29088 Vceo=15 Icrating=4m mfg=Infineon)
>>>> TEXT -904 1024 Left 2 !.tran 0 500n 0
>>>>
>>>> It's just a two transistor emitter-coupled monostable, but with the two
>>>> transistors as BFR92's run at 10mA,  it produces 1nsec pulse without fuss.
>>>>
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