Version 4.1 SHEET 1 5632 2544 WIRE 1936 1744 1888 1744 WIRE 1984 1744 1936 1744 WIRE 2144 1744 2064 1744 WIRE 2880 1744 2832 1744 WIRE 3040 1744 2944 1744 WIRE 1888 1760 1888 1744 WIRE 2144 1824 2144 1744 WIRE 2832 1840 2832 1744 WIRE 2864 1840 2832 1840 WIRE 3008 1840 2944 1840 WIRE 3040 1840 3040 1744 WIRE 3040 1840 3008 1840 WIRE 1888 1856 1888 1840 WIRE 2976 1904 2928 1904 WIRE 3008 1904 2976 1904 WIRE 2928 1920 2928 1904 WIRE 2144 1936 2144 1888 WIRE 2208 1936 2144 1936 WIRE 2336 1936 2208 1936 WIRE 2464 1936 2336 1936 WIRE 2752 1936 2464 1936 WIRE 2832 1936 2832 1840 WIRE 2832 1936 2816 1936 WIRE 2896 1936 2832 1936 WIRE 3040 1952 3040 1840 WIRE 3040 1952 2960 1952 WIRE 2896 1968 2848 1968 WIRE 1872 1984 1824 1984 WIRE 2144 1984 2144 1936 WIRE 2144 1984 1952 1984 WIRE 2848 2000 2848 1968 WIRE 2928 2000 2928 1984 WIRE 2144 2016 2144 1984 WIRE 2336 2032 2336 1936 WIRE 2464 2032 2464 1936 WIRE 1824 2096 1824 1984 WIRE 1872 2096 1824 2096 WIRE 2000 2096 1952 2096 WIRE 2048 2096 2000 2096 WIRE 2096 2096 2048 2096 WIRE 2848 2096 2848 2080 WIRE 1824 2112 1824 2096 WIRE 2000 2112 2000 2096 WIRE 2144 2128 2144 2112 WIRE 2336 2144 2336 2112 WIRE 2464 2144 2464 2112 WIRE 1824 2208 1824 2176 WIRE 2000 2208 2000 2176 WIRE 2144 2224 2144 2208 FLAG 2208 1936 MFO FLAG 2144 2224 0 FLAG 2048 2096 GM2 FLAG 1936 1744 VC FLAG 1824 2208 0 FLAG 2336 2144 0 FLAG 1888 1856 0 FLAG 2464 2144 0 FLAG 2000 2208 0 FLAG 2928 2000 0 FLAG 2976 1904 VC FLAG 2848 2096 0 FLAG 3008 1840 OTA SYMBOL cap 1840 2176 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C12 SYMATTR Value 82p SYMBOL nmos 2096 2016 R0 SYMATTR InstName M2 SYMATTR Value RK7002BM SYMBOL res 1968 2000 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R17 SYMATTR Value 33k SYMBOL res 2080 1760 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R18 SYMATTR Value 1 SYMBOL diode 1824 1888 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D5 SYMATTR Value BAS16HY SYMBOL current 2336 2112 M180 WINDOW 0 24 80 Left 2 WINDOW 3 24 0 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value 100µ SYMBOL voltage 1888 1744 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL current 2464 2112 M180 WINDOW 0 24 80 Left 2 WINDOW 3 24 0 Left 2 WINDOW 123 24 -28 Left 2 WINDOW 39 0 0 Left 0 SYMATTR InstName I2 SYMATTR Value SINE(0 1u 58000 0 0 0 55) SYMATTR Value2 AC 1u SYMBOL res 1968 2112 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 68k SYMBOL cap 2016 2176 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C1 SYMATTR Value 39p SYMBOL res 2128 2112 R0 SYMATTR InstName R3 SYMATTR Value 1K SYMBOL OpAmps\\UniversalOpAmp3 2928 1952 R0 SYMATTR InstName U1 SYMATTR Value2 Avol=1Meg GBW=90Meg Slew=120Meg SYMBOL res 2960 1856 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R4 SYMATTR Value 270K SYMBOL cap 2752 1952 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C2 SYMATTR Value 680p SYMBOL voltage 2848 1984 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 2.5 SYMBOL diode 2160 1888 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D1 SYMATTR Value RF05VAM1S SYMBOL cap 2880 1728 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 0.2p TEXT 2176 1744 Left 2 ;.tran 0 2m 0 10n TEXT 2184 1776 Left 2 !.ac oct 100 10 500k TEXT 1824 1688 Left 2 ;Active High Pass load for IR Diode with OTA buffer TEXT 2184 1808 Left 2 !.STEP I1 10u 100u 20u TEXT 2248 2248 Left 2 ;M2 needs quite low C bypass feedback, as OTA lowers Zout \nC2 moves peak to ~38kHz\n1uA pk gives 1.05Vp-p out, moderate Q ~ 3 cycles ringing\nM2 dual RC 56k 68pF gives \nPeak = -2.43dB 100Hz = -72.667dB 10Hz = -92.646dB\nM2 dual RC 33k/130p/56k/60p gives 1.90Vpp ~ 4 cycles ring\nPeak .036dB 100Hz = -75.059dB 10Hz = -95.075783dB\nChange OpAmp to faster one (90MHz 120V/us)\nM2 dual RC 33k/82p/68k/39p/680p/270k/0.2p gives -2.5dB at 57.8kHz\nMFO = -58dB to peak of -39dB, notch 280kHz, OTA 100Hz -74dB 10Hz -94dB\n1uA peak gives 1.48Vp-p out, moderate Q appx 3 cycles decay TEXT 1680 2272 Left 2 ;M2 = lowest C stray FET, lowest gate charge\nR3 lowers residual ripple gain\nIt should be as high as DC/sunlight allows\nIn order to reduce peak-shift with DC TEXT 2232 2192 Left 2 ;MFO ~ -68dB at 1kHz and peaks at -38dB at 37.71kHz, has notch at 84.8Khz TEXT 2432 1632 Left 1 ;RUNIC_RS8761PXF_C50201997_OpAmp_2v7-5v5_RRIO_6nV_120Mhz_180Vus_100mA_8p3mA_3pA_t1mV_SOT25_10c.pdf\nJiangsu-RUNIC-Tech-RS8751XF_C236995_OpAmp_2v5-5v5_250Mhz_180Vus_1pA_1p5mV_SOT23_15c\nGTIC-GT8051S5_C22356876_OpAmp_Single_RRO_250Mhz_180Vus_1p5mV_100mA_5v5_SOT25_12p5c\nGainsil-GS8092-MR_C605422_opAmp_350MHz_RRO_5v5_1pA_119Vus_120mA_4p3nV_SO8_21c