JM posted a version of the 1kHz sinewave oscillator using G1 and A1 blocks as sample/hold.
I decided to attempt a practical design of the sample/hold.
One way to get a nice short sample pulse is to use a ringing circuit which only turns the sample gate on during the first ring.
Before commenting/laughing please be sure you understand that this is just an idea, nothing more.
It can no doubt be improved and it may be best to throw it out completely and do it some other way. A cheaper pulse transformer than the one shown can likely be found. In a real circuit R16 would need to be adjustable to accommodate FET gate threshold tolerances.
If anyone reading this thinks I'm expecting flattery for designing this then I'm happy to tell them in advance that I think they are nuts.
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InstName R2 SYMATTR Value 16K SYMBOL res -352 -112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 16K SYMBOL cap -592 -112 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 10n SYMBOL cap -224 -112 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL res -736 -368 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 10K SYMBOL res -736 -208 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R5 SYMATTR Value 1.8Meg SYMBOL cap -1392 512 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 1u SYMBOL res -1232 736 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R10 SYMATTR Value 330K SYMBOL res -1152 -112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 10k SYMBOL res -1408 624 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R6 SYMATTR Value 47k SYMBOL cap -1440 592 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 10u SYMBOL OpAmps\\LT1679 -1408 736 M0 SYMATTR InstName U3 SYMBOL res -2144 848 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R23 SYMATTR Value 1k SYMBOL npn -2144 640 M0 SYMATTR InstName Q4 SYMATTR Value 2N3904 SYMBOL res -2144 1072 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R24 SYMATTR Value 540K SYMBOL current -2208 1152 M0 SYMATTR InstName I1 SYMATTR Value 1m SYMBOL res -2032 960 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R26 SYMATTR Value 540K SYMBOL current -2560 1152 R0 SYMATTR InstName I2 SYMATTR Value 1m SYMBOL res -2368 416 M0 SYMATTR InstName R27 SYMATTR Value 300 SYMBOL res -1968 432 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R30 SYMATTR Value 15K SYMBOL current -2144 -256 M0 SYMATTR InstName I3 SYMATTR Value 650u SYMBOL current -2624 -256 M0 SYMATTR InstName I4 SYMATTR Value 650u SYMBOL res -1776 240 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R31 SYMATTR Value 1k SYMBOL res -1776 -240 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R34 SYMATTR Value 1k SYMBOL cap -1792 304 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C13 SYMATTR Value 33p SYMBOL npn -2080 224 M0 SYMATTR InstName Q2B SYMATTR Value {BN} SYMBOL npn -2432 224 M0 SYMATTR InstName Q2A SYMATTR Value {BN} SYMBOL npn -2336 224 R0 WINDOW 3 55 69 Left 2 SYMATTR Value {BN} SYMATTR InstName Q1B SYMBOL npn -2688 224 R0 WINDOW 3 53 71 Left 2 SYMATTR Value {BN} SYMATTR InstName Q1A SYMBOL res -2624 848 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R35 SYMATTR Value 1k SYMBOL npn -2624 640 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL cap -1792 -352 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C14 SYMATTR Value 33p SYMBOL voltage -1504 -608 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 15 SYMBOL voltage -1504 -464 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 15 SYMBOL res -1904 704 R0 SYMATTR InstName R17 SYMATTR Value 10k SYMBOL res -1904 560 R0 SYMATTR InstName R20 SYMATTR Value 5k SYMBOL cap -1792 720 R0 SYMATTR InstName C10 SYMATTR Value 10n SYMBOL res -1360 -80 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R21 SYMATTR Value 4K7 SYMBOL res -1568 -80 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R22 SYMATTR Value 1k SYMBOL res -1568 112 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R25 SYMATTR Value 1k SYMBOL res -1504 112 M0 SYMATTR InstName R28 SYMATTR Value 4k7 SYMBOL OpAmps\\LT1679 -2704 688 M180 WINDOW 3 18 51 Left 2 SYMATTR InstName U10 SYMBOL OpAmps\\LT1679 -2064 688 R180 WINDOW 3 16 46 Left 2 SYMATTR InstName U7 SYMBOL schottky -1456 400 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value BAT54 SYMATTR Description Diode SYMATTR Type diode SYMBOL diode -1232 736 R0 SYMATTR InstName D3 SYMATTR Value 1N914 SYMBOL res -1728 432 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R7 SYMATTR Value 15K SYMBOL res -1040 560 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 110k SYMBOL g -432 624 M0 WINDOW 3 -255 133 Left 2 SYMATTR Value table(-2m,0,2m,1) SYMATTR InstName G1 SYMBOL cap -512 656 M0 SYMATTR InstName C6 SYMATTR Value 2p SYMBOL res -592 624 M0 SYMATTR InstName R13 SYMATTR Value 1 SYMBOL SpecialFunctions\\sample -768 560 M0 SYMATTR InstName A1 SYMBOL e -768 288 M0 SYMATTR InstName E1 SYMATTR Value -1 SYMBOL cap -1936 432 R0 SYMATTR InstName C5 SYMATTR Value 1u5 SYMBOL OpAmps\\opamp -1056 -32 R0 SYMATTR InstName U5 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL OpAmps\\opamp -624 -32 R0 SYMATTR InstName U6 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL OpAmps\\opamp -256 -32 R0 SYMATTR InstName U8 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL OpAmps\\opamp -1424 -32 R0 SYMATTR InstName U2 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL OpAmps\\opamp -1824 -160 R0 SYMATTR InstName U4 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL OpAmps\\opamp -1824 160 M180 SYMATTR InstName U9 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL ind2 304 112 R0 WINDOW 0 -43 36 Left 2 WINDOW 3 -46 73 Left 2 SYMATTR InstName L1 SYMATTR Value 1m SYMATTR Type ind SYMATTR SpiceLine Rser=1 SYMBOL ind2 432 224 R180 WINDOW 0 -29 74 Left 2 WINDOW 3 -38 43 Left 2 SYMATTR InstName L2 SYMATTR Value 1m SYMATTR Type ind SYMATTR SpiceLine Rser=1 SYMBOL res 304 -192 R0 SYMATTR InstName R11 SYMATTR Value 33 SYMBOL npn 160 464 R0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL diode 32 640 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D2 SYMATTR Value 1N914 SYMBOL cap 176 128 R0 SYMATTR InstName C7 SYMATTR Value 47n SYMBOL res 768 112 R0 SYMATTR InstName R16 SYMATTR Value 150 SYMBOL nmos 1008 -224 M270 WINDOW 0 19 -9 VLeft 2 WINDOW 3 75 84 VLeft 2 SYMATTR InstName M1 SYMATTR Value 2N7002 SYMBOL nmos 608 -224 R270 WINDOW 0 19 -9 VLeft 2 WINDOW 3 75 84 VLeft 2 SYMATTR InstName M2 SYMATTR Value 2N7002 SYMBOL res 0 240 R0 SYMATTR InstName R18 SYMATTR Value 22k SYMBOL cap 192 -64 R0 SYMATTR InstName C11 SYMATTR Value 1000n SYMBOL cap 480 128 R0 SYMATTR InstName C12 SYMATTR Value 47n SYMBOL npn 256 560 R0 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL res 640 80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 1.5k SYMBOL diode 720 208 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D4 SYMATTR Value 1N914 SYMBOL cap 1072 -192 R0 SYMATTR InstName C9 SYMATTR Value 10n SYMBOL OpAmps\\opamp 1216 -352 R0 SYMATTR InstName U1 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL OpAmps\\opamp 464 -336 R0 SYMATTR InstName U11 SYMATTR SpiceLine Aol=5Meg SYMATTR SpiceLine2 GBW=60Meg SYMBOL res 0 368 R0 SYMATTR InstName R8 SYMATTR Value 22k SYMBOL cap -80 368 R0 SYMATTR InstName C8 SYMATTR Value 2.2n TEXT -2080 -600 Left 2 !.tran 0 5 0 1u uic TEXT -2080 -632 Left 2 !.options plotwinsize=0 numdgt=15 TEXT -3208 -592 Left 2 !.MODEL BCM847BS NPN IS = 1.822E-14 NF = 0.9932 ISE= 2.894E-16 NE = 1.4 \n+ BF = 324.4 IKF = 0.109 VAF = 82 NR = 0.9931 ISC = 9.982E-12 NC = 1.763 \n+ BR = 8.29 IKR = 0.09 VAR = 17.9 RB = 10 IRB = 5E-06 RBM = 5 RE = 0.649 \n+ RC = 0.7014 CJE = 1.244E-11 VJE = 0.7579 MJE = 0.3656 TF = 4.908E-10 \n+ XTF = 9.51 VTF = 2.927 ITF = 0.3131 PTF = 0 CJC = 3.347E-12 VJC =
0.5463 \n+ MJC = 0.391 XCJC = 0.6193 TR = 9E-08 CJS = 0 VJS = 0.75 MJS = 0.333 \n+ XTB = 0 XTI = 3 EG = 1.11 FC = 0.979 TEXT -2088 -456 Left 2 !.param BN=847 TEXT -2088 -488 Left 2 !.model 847 ako:BCM847BS TEXT -2080 -552 Left 2 !.lib opamp.sub TEXT 424 256 Top 2 !K1 L1 L2 0.98 TEXT 344 64 Left 2 ;PMT9085.011NLT