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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Bill Sloman Newsgroups: sci.electronics.design Subject: The emitter-coupled monostable as slow differential amplifer Date: Sat, 20 Jul 2024 15:29:58 +1000 Organization: A noiseless patient Spider Lines: 155 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sat, 20 Jul 2024 07:30:14 +0200 (CEST) Injection-Info: dont-email.me; posting-host="595e830362a1d1863190fb3120b06901"; logging-data="3587044"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18JwTXF0+j5HsolNCtyQtq2nTuKQWWdxyI=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:6GZ3dMTLDby9qEULfZYY5dbFYh4= X-Antivirus-Status: Clean Content-Language: en-US X-Antivirus: Norton (VPS 240719-10, 20/7/2024), Outbound message Bytes: 5167 About a month ago John Larkin dismissed the emitter coupled monostable with "It's really a slow diffamp, not a one-shot." If you feed a really slow pulse into it, it can look that way. The 3.3pf capacitor at C1 doesn't feed through much current if you drive the input with a slow edge The simulation below demonstrates it working exactly that way. No sensible circuit designer would deliberately drive it with a very slowly rising and falling pulse - if you want it to work as a monostable pulse stretcher, you have to drive it with a pulse that is narrower than the one you want to get out. Integrated circuit monostables don't have that limitation, but they are more complicated, and slower. There was an ECL monostable that went down to 10nsec, but the emitter-coupled monostable lets you get down to 1nsec, if you use it right. Version 4 SHEET 1 3104 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 2 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 2 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 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value PULSE(0 0.2 1n 100n 100n 100p 500n 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 1k5 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 1u 0 -- Bill Sloman, Sydney -- This email has been checked for viruses by Norton antivirus software. www.norton.com