Re: Oscillator

Helmut Sennewald · 2003-06-14T16:27:46-07:00

Hello Al, I modified your oscillator circuit and added also some comments. It is very important to have well defined settings for the simulator. Accidentally by far not all paramaters can be

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Re: Oscillator

Helmut Sennewald All Messages By This Member #880 --- In LTspice@..., "Al Williams" <alw@a...> wrote: I put the ASC file in the Files section. The simulation time is quite long, but it seemed to stablize around 30uS or so. Hello Al, I modified your oscillator circuit and added also some comments. It is very important to have well defined settings for the simulator. Accidentally by far not all paramaters can be controlled from the schematic or the netlist. This is a very bad drawback of LTSPICE. I would appreciate to have commands for all simulator settings. Setup the Simulator: The points 1 to 4 are the most important actions. 1. Control Panel->Spice->Reset to Default 2. Control Panel->Hacks->Reset to Default 3. Control Panel Hacks->Supply a min. inductor damping->click off 4. Don't use integration method Gear. It tends to let die the oscillation of this crystal oscillator. 5. Start your simulations with a lower Q of the crystal to reduce turnaround time during development of your circuit. Later you can increase Q and simulation time. My new schematic file is in the Files->Examples->Educational Menu too. By the way, this is not the best type of one transistor oscillator for 12Mhz. There are better suited circuits. Best Regards Helmut Pierce_12Mhz_r.asc: You have to repair the two broken long lines with a text editor. .TEXT 728 324 ..... .TEXT 728 524 ..... You can find this file in the Files->Examples->Educational folder too. Version 4 SHEET 1 2020 1396 WIRE 1248 752 1280 752 WIRE 1344 752 1376 752 WIRE 1136 656 1136 752 WIRE 1328 1040 1136 1040 WIRE 1136 752 1136 1040 WIRE 1392 992 1392 960 WIRE 1392 960 1472 960 WIRE 1920 1232 1920 1344 WIRE 1920 1344 1568 1344 WIRE 1408 1344 1408 1376 WIRE 1440 1200 1440 1232 WIRE 1440 1344 1408 1344 WIRE 1344 1344 1408 1344 WIRE 1440 1136 1440 1104 WIRE 1440 1104 1392 1104 WIRE 1392 1104 1392 1088 WIRE 1344 1344 1136 1344 WIRE 800 960 800 1088 WIRE 640 1344 800 1344 WIRE 800 1344 944 1344 WIRE 944 960 800 960 WIRE 688 960 640 960 WIRE 640 960 640 1056 WIRE 800 1152 800 1344 WIRE 640 1136 640 1344 WIRE 944 1056 944 960 WIRE 944 1344 944 1248 WIRE 944 1136 944 1152 WIRE 1136 1040 1136 1136 WIRE 944 1152 944 1168 WIRE 1344 1216 1344 1344 WIRE 1344 1136 1344 1104 WIRE 1344 1104 1392 1104 WIRE 1232 656 1136 656 WIRE 1472 656 1296 656 WIRE 1136 752 1168 752 WIRE 1456 752 1472 752 WIRE 1472 752 1472 656 WIRE 800 960 768 960 WIRE 1232 960 944 960 WIRE 1312 960 1392 960 WIRE 1344 1056 1328 1056 WIRE 1328 1056 1328 1040 WIRE 1568 992 1568 960 WIRE 1568 960 1472 960 WIRE 1568 1056 1568 1104 WIRE 1568 1344 1440 1344 WIRE 1568 1216 1568 1344 WIRE 1568 1104 1568 1152 WIRE 1920 1104 1568 1104 WIRE 1920 1104 1920 1152 WIRE 1136 1200 1136 1344 WIRE 1136 1344 944 1344 WIRE 992 1152 992 1040 WIRE 992 1152 944 1152 WIRE 992 1040 1136 1040 WIRE 1472 960 1472 752 WIRE 1440 1312 1440 1344 FLAG 1408 1376 GND FLAG 1920 1104 Output SYMBOL voltage 640 1040 R0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL res 784 944 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 100 SYMBOL res 960 1152 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL res 960 1264 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL cap 784 1088 R0 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL cap 1120 1136 R0 WINDOW 3 25 60 Left 0 SYMATTR InstName C2 SYMATTR Value 33p SYMBOL res 1904 1136 R0 SYMATTR InstName R4 SYMATTR Value 50 SYMBOL ind 1264 736 R90 WINDOW 0 5 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName L0 SYMATTR Value {L0} SYMBOL cap 1344 736 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C0 SYMATTR Value {C0} SYMBOL cap 1296 640 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName Cp SYMATTR Value 5p SYMBOL res 1472 736 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R0 SYMATTR Value {R0} SYMBOL cap 1424 1136 R0 SYMATTR InstName C7 SYMATTR Value 10n SYMBOL res 1328 1120 R0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL res 1216 976 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R7 SYMATTR Value 1k SYMBOL cap 1552 992 R0 SYMATTR InstName C9 SYMATTR Value 33p SYMBOL cap 1552 1152 R0 SYMATTR InstName C10 SYMATTR Value 2.2n SYMBOL res 1424 1216 R0 SYMATTR InstName R8 SYMATTR Value 1 SYMBOL npn 1328 992 R0 SYMATTR InstName Q1 SYMATTR Value 2N2369 TEXT 736 736 Left 0 !.tran 0 3m 0 0.005u TEXT 736 768 Left 0 !.IC I(L0)=1e-24 TEXT 728 384 Left 0 ;Setup the Simulator:\n1. Control Panel->Spice- Reset to Default\n2. Control Panel->Hacks->Reset to Default\n3. Control Panel Hacks->Supply a min. inductor damping->click off\n4. Don't use integartion method Gear. It tends to let die the oscillation.\n5. Start your simulations with a lower Q of the crystal to reduce startup simulation time. TEXT 728 584 Left 0 !.PARAM f0=12e6\n.PARAM Q=50000\n.PARAM R0=60 \n.PARAM L0={QR0/(2pif0)}\n.PARAM C0={1/(2pif0Q*R0)}

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Re: Oscillator