Eric Fontaine ericfont
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ericfont
/ circuit-20260701-2351.svg
Last active
July 2, 2026 04:21
good 20kHz reconstruction with promising PWM DSM
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ericfont
/ 2ndorder-DSM-noise-analysis.asc
Created
June 30, 2026 17:19
2ndorder-DSM-noise-analysis.asc
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| Version 4.1 | |
| SHEET 1 968 680 | |
| WIRE 736 -176 352 -176 | |
| WIRE 736 -112 736 -176 | |
| WIRE 736 -112 720 -112 | |
| WIRE 752 -112 736 -112 | |
| WIRE 736 -96 736 -112 | |
| WIRE 352 -32 352 -176 | |
| WIRE 352 -32 320 -32 | |
| WIRE 576 -16 576 -112 |
ericfont
/ circuit-20260630-0152.svg
Created
June 30, 2026 05:50
try to move PWM DSM's noise filter pole up as high as possible, even higher than PWM rate
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ericfont
/ circuit-20260629-1134.svg
Created
June 29, 2026 15:32
PWM dsm try again, with higher 500kHz sampler
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| <cir f="1" ts="5.0000000000000004e-8" ic="124.26481670549957" cb="50" pb="50" vr="5" mts="5e-11"> | |
| <ExtVoltage x="336 80 288 80" f="0" wf="1" fr="40" maxv="5" nm="pin 3"/> | |
| <ExtVoltage x="336 192 288 192" f="0" wf="1" fr="40" maxv="5" nm="pin 9"/> | |
| <LED x="336 80 384 80" f="2" mo="default-led" cr="1" cg="0" cb="0" mbc="0.01"/> | |
| <r x="384 80 432 80" f="0" r="1000"/> | |
| <g x="432 80 448 80" f="0"/> | |
| <r x="336 192 384 192" f="0" r="1000"/> | |
| <LED x="480 176 528 176" f="2" mo="default-led" cr="1" cg="0" cb="0" mbc="0.01"/> | |
| <c x="384 240 384 192" f="2" c="1.0000000000000001e-7" iv="0.001" sr="0" vd="-2.120788941832159"/> | |
| <g x="384 240 384 256" f="0"/> |
ericfont
/ circuit-20260628-1746.svg
Created
June 28, 2026 21:45
encode derivative using DSM then integrate
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