| EESchema Schematic File Version 4 |
| EELAYER 30 0 |
| EELAYER END |
| $Descr A4 11693 8268 |
| encoding utf-8 |
| Sheet 5 7 |
| Title "icE1usb - E1 interface bias generation" |
| Date "2020-08-26" |
| Rev "1.0" |
| Comp "" |
| Comment1 "CERN-OHL-S" |
| Comment2 "(C) 2020 Sylvain Munaut" |
| Comment3 "" |
| Comment4 "" |
| $EndDescr |
| Text HLabel 2000 3500 0 50 Input ~ 0 |
| bias0 |
| Text HLabel 2000 4500 0 50 Input ~ 0 |
| bias1 |
| Text HLabel 5500 2500 2 50 Output ~ 0 |
| bias_a_p |
| Text HLabel 5500 3500 2 50 Output ~ 0 |
| bias_a_n |
| Text HLabel 5500 4500 2 50 Output ~ 0 |
| bias_b_p |
| Text HLabel 5500 5500 2 50 Output ~ 0 |
| bias_b_n |
| $Comp |
| L Device:R_Small R20 |
| U 1 1 5F4D7D0D |
| P 4700 2500 |
| F 0 "R20" V 4504 2500 50 0000 C CNN |
| F 1 "0R" V 4595 2500 50 0000 C CNN |
| F 2 "Resistor_SMD:R_0603_1608Metric" H 4700 2500 50 0001 C CNN |
| F 3 "~" H 4700 2500 50 0001 C CNN |
| 1 4700 2500 |
| 0 1 1 0 |
| $EndComp |
| $Comp |
| L Device:C_Small C27 |
| U 1 1 5F4D81DA |
| P 3000 3700 |
| F 0 "C27" H 3092 3746 50 0000 L CNN |
| F 1 "1u" H 3092 3655 50 0000 L CNN |
| F 2 "Capacitor_SMD:C_0603_1608Metric" H 3000 3700 50 0001 C CNN |
| F 3 "~" H 3000 3700 50 0001 C CNN |
| 1 3000 3700 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L Device:C_Small C28 |
| U 1 1 5F4D8409 |
| P 3000 4700 |
| F 0 "C28" H 3092 4746 50 0000 L CNN |
| F 1 "1u" H 3092 4655 50 0000 L CNN |
| F 2 "Capacitor_SMD:C_0603_1608Metric" H 3000 4700 50 0001 C CNN |
| F 3 "~" H 3000 4700 50 0001 C CNN |
| 1 3000 4700 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L power:GND #PWR057 |
| U 1 1 5F4D8911 |
| P 3000 3900 |
| F 0 "#PWR057" H 3000 3650 50 0001 C CNN |
| F 1 "GND" H 3005 3727 50 0000 C CNN |
| F 2 "" H 3000 3900 50 0001 C CNN |
| F 3 "" H 3000 3900 50 0001 C CNN |
| 1 3000 3900 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L power:GND #PWR058 |
| U 1 1 5F4D8C18 |
| P 3000 4900 |
| F 0 "#PWR058" H 3000 4650 50 0001 C CNN |
| F 1 "GND" H 3005 4727 50 0000 C CNN |
| F 2 "" H 3000 4900 50 0001 C CNN |
| F 3 "" H 3000 4900 50 0001 C CNN |
| 1 3000 4900 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 3000 4800 3000 4900 |
| Wire Wire Line |
| 2700 4500 3000 4500 |
| Wire Wire Line |
| 3000 4500 3000 4600 |
| Wire Wire Line |
| 2500 4500 2000 4500 |
| Wire Wire Line |
| 2000 3500 2500 3500 |
| Wire Wire Line |
| 2700 3500 3000 3500 |
| Wire Wire Line |
| 3000 3500 3000 3600 |
| Wire Wire Line |
| 3000 3800 3000 3900 |
| $Comp |
| L Device:C_Small C26 |
| U 1 1 5F4DA17F |
| P 3000 2700 |
| F 0 "C26" H 3092 2746 50 0000 L CNN |
| F 1 "1u" H 3092 2655 50 0000 L CNN |
| F 2 "Capacitor_SMD:C_0603_1608Metric" H 3000 2700 50 0001 C CNN |
| F 3 "~" H 3000 2700 50 0001 C CNN |
| 1 3000 2700 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L s47-passive:R_Pack04_Split RN7 |
| U 1 1 5F4DCADF |
| P 2600 2500 |
| F 0 "RN7" V 2404 2500 50 0000 C CNN |
| F 1 "10k" V 2495 2500 50 0000 C CNN |
| F 2 "Resistor_SMD:R_Array_Convex_4x0603" H 2600 2500 60 0001 C CNN |
| F 3 "" H 2600 2500 60 0000 C CNN |
| 1 2600 2500 |
| 0 1 1 0 |
| $EndComp |
| $Comp |
| L s47-passive:R_Pack04_Split RN7 |
| U 2 1 5F4DCF84 |
| P 2800 2700 |
| F 0 "RN7" H 2741 2746 50 0000 R CNN |
| F 1 "10k" H 2741 2655 50 0000 R CNN |
| F 2 "Resistor_SMD:R_Array_Convex_4x0603" H 2800 2700 60 0001 C CNN |
| F 3 "" H 2800 2700 60 0000 C CNN |
| 2 2800 2700 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L s47-passive:R_Pack04_Split RN7 |
| U 4 1 5F4DD23C |
| P 2600 4500 |
| F 0 "RN7" V 2404 4500 50 0000 C CNN |
| F 1 "10k" V 2495 4500 50 0000 C CNN |
| F 2 "Resistor_SMD:R_Array_Convex_4x0603" H 2600 4500 60 0001 C CNN |
| F 3 "" H 2600 4500 60 0000 C CNN |
| 4 2600 4500 |
| 0 1 1 0 |
| $EndComp |
| $Comp |
| L s47-passive:R_Pack04_Split RN7 |
| U 3 1 5F4DD9E1 |
| P 2600 3500 |
| F 0 "RN7" V 2404 3500 50 0000 C CNN |
| F 1 "10k" V 2495 3500 50 0000 C CNN |
| F 2 "Resistor_SMD:R_Array_Convex_4x0603" H 2600 3500 60 0001 C CNN |
| F 3 "" H 2600 3500 60 0000 C CNN |
| 3 2600 3500 |
| 0 1 1 0 |
| $EndComp |
| Wire Wire Line |
| 2700 2500 2800 2500 |
| Wire Wire Line |
| 3000 2500 3000 2600 |
| Wire Wire Line |
| 2800 2500 2800 2600 |
| Connection ~ 2800 2500 |
| Wire Wire Line |
| 2800 2500 3000 2500 |
| $Comp |
| L power:GND #PWR056 |
| U 1 1 5F4DFC15 |
| P 3000 2900 |
| F 0 "#PWR056" H 3000 2650 50 0001 C CNN |
| F 1 "GND" H 3005 2727 50 0000 C CNN |
| F 2 "" H 3000 2900 50 0001 C CNN |
| F 3 "" H 3000 2900 50 0001 C CNN |
| 1 3000 2900 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L power:GND #PWR055 |
| U 1 1 5F4DFEE3 |
| P 2800 2900 |
| F 0 "#PWR055" H 2800 2650 50 0001 C CNN |
| F 1 "GND" H 2805 2727 50 0000 C CNN |
| F 2 "" H 2800 2900 50 0001 C CNN |
| F 3 "" H 2800 2900 50 0001 C CNN |
| 1 2800 2900 |
| 1 0 0 -1 |
| $EndComp |
| $Comp |
| L power:+3V3 #PWR054 |
| U 1 1 5F4E01FD |
| P 2400 2400 |
| F 0 "#PWR054" H 2400 2250 50 0001 C CNN |
| F 1 "+3V3" H 2415 2573 50 0000 C CNN |
| F 2 "" H 2400 2400 50 0001 C CNN |
| F 3 "" H 2400 2400 50 0001 C CNN |
| 1 2400 2400 |
| 1 0 0 -1 |
| $EndComp |
| Wire Wire Line |
| 2400 2400 2400 2500 |
| Wire Wire Line |
| 2400 2500 2500 2500 |
| Wire Wire Line |
| 2800 2800 2800 2900 |
| Wire Wire Line |
| 3000 2800 3000 2900 |
| $Comp |
| L Device:R_Small R21 |
| U 1 1 5F4E23E9 |
| P 4700 2700 |
| F 0 "R21" V 4804 2700 50 0000 C CNN |
| F 1 "0R" V 4895 2700 50 0000 C CNN |
| F 2 "Resistor_SMD:R_0603_1608Metric" H 4700 2700 50 0001 C CNN |
| F 3 "~" H 4700 2700 50 0001 C CNN |
| F 4 "DNP" V 4986 2700 50 0000 C CNN "DNP" |
| 1 4700 2700 |
| 0 1 1 0 |
| $EndComp |
| Text Notes 7600 2700 0 50 ~ 0 |
| A+ |
| Text Notes 8100 2700 0 50 ~ 0 |
| A- |
| Text Notes 8600 2700 0 50 ~ 0 |
| B+ |
| Text Notes 9100 2700 0 50 ~ 0 |
| B- |
| Text Notes 6600 3000 0 50 ~ 0 |
| Single Sensitivity\nDual Rail bias adjust |
| Text Notes 6600 3400 0 50 ~ 0 |
| Dual Sensitivity\nSingle Rail bias adjust |
| Text Notes 7600 3300 0 50 ~ 0 |
| Fixed |
| Text Notes 8600 3300 0 50 ~ 0 |
| Fixed |
| Text Notes 8100 3300 0 50 ~ 0 |
| Bias 0 |
| Text Notes 9100 3300 0 50 ~ 0 |
| Bias 1 |
| Text Notes 9100 2900 0 50 ~ 0 |
| Bias 1 |
| Text Notes 8600 2900 0 50 ~ 0 |
| Bias 0 |
| Text Notes 7600 2900 0 50 ~ 0 |
| Bias 0 |
| Text Notes 8100 2900 0 50 ~ 0 |
| Bias 1 |
| Wire Notes Line |
| 6500 2800 9500 2800 |
| Wire Notes Line |
| 7500 2600 7500 3500 |
| Wire Wire Line |
| 3000 4500 3500 4500 |
| Connection ~ 3000 4500 |
| Wire Wire Line |
| 3000 3500 3500 3500 |
| Connection ~ 3000 3500 |
| Wire Wire Line |
| 3000 2500 3500 2500 |
| Connection ~ 3000 2500 |
| Text Label 3500 2500 2 50 ~ 0 |
| bias_fixed |
| Text Label 3500 3500 2 50 ~ 0 |
| bias_0 |
| Wire Wire Line |
| 5500 5500 4000 5500 |
| Text Label 4000 5500 0 50 ~ 0 |
| bias_1 |
| Wire Wire Line |
| 5300 4500 5500 4500 |
| Wire Wire Line |
| 4800 2700 5000 2700 |
| Wire Wire Line |
| 5000 2700 5000 2500 |
| Connection ~ 5000 2500 |
| Wire Wire Line |
| 5000 2500 4800 2500 |
| Wire Wire Line |
| 4600 2500 4000 2500 |
| Wire Wire Line |
| 4600 2700 4000 2700 |
| Wire Wire Line |
| 5000 2500 5300 2500 |
| Wire Wire Line |
| 5300 2500 5300 4500 |
| Connection ~ 5300 2500 |
| Wire Wire Line |
| 5300 2500 5500 2500 |
| $Comp |
| L Device:R_Small R22 |
| U 1 1 5F50BC9B |
| P 4700 3500 |
| F 0 "R22" V 4504 3500 50 0000 C CNN |
| F 1 "0R" V 4595 3500 50 0000 C CNN |
| F 2 "Resistor_SMD:R_0603_1608Metric" H 4700 3500 50 0001 C CNN |
| F 3 "~" H 4700 3500 50 0001 C CNN |
| 1 4700 3500 |
| 0 1 1 0 |
| $EndComp |
| Wire Wire Line |
| 4600 3500 4000 3500 |
| Wire Wire Line |
| 4600 3700 4000 3700 |
| Wire Wire Line |
| 4800 3500 5000 3500 |
| Wire Wire Line |
| 4800 3700 5000 3700 |
| Wire Wire Line |
| 5000 3700 5000 3500 |
| Connection ~ 5000 3500 |
| Wire Wire Line |
| 5000 3500 5500 3500 |
| Text Label 4000 2500 0 50 ~ 0 |
| bias_fixed |
| Text Label 4000 2700 0 50 ~ 0 |
| bias_0 |
| Text Label 4000 3500 0 50 ~ 0 |
| bias_0 |
| Text Label 3500 4500 2 50 ~ 0 |
| bias_1 |
| Text Label 4000 3700 0 50 ~ 0 |
| bias_1 |
| $Comp |
| L Device:R_Small R23 |
| U 1 1 5F50BF56 |
| P 4700 3700 |
| F 0 "R23" V 4804 3700 50 0000 C CNN |
| F 1 "0R" V 4895 3700 50 0000 C CNN |
| F 2 "Resistor_SMD:R_0603_1608Metric" H 4700 3700 50 0001 C CNN |
| F 3 "~" H 4700 3700 50 0001 C CNN |
| F 4 "DNP" V 4986 3700 50 0000 C CNN "DNP" |
| 1 4700 3700 |
| 0 1 1 0 |
| $EndComp |
| Text Notes 2100 5400 0 50 ~ 0 |
| f_c = 16 Hz for single pole RC |
| $EndSCHEMATC |