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EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A 11000 8500
encoding utf-8
Sheet 5 17
Title "RFIDr_Open_PA_BIAS_CTRL"
Date "2020-05-21"
Rev "A"
Comp "Superlative Semiconductor LLC"
Comment1 "Copyright 2021 Superlative Semiconductor LLC."
Comment2 "Licensed under CERN-OHL-P v2 or later."
Comment3 "This source provided WITHOUT ANY EXPRESS OR IMPLIED WARRANTY."
Comment4 "Author: E. Keehr"
$EndDescr
Text Label 8800 2650 2 60 ~ 0
VDD_OPA_PA
$Comp
L power:GND #PWR0129
U 1 1 5E2C3591
P 9425 3725
F 0 "#PWR0129" H 9425 3475 50 0001 C CNN
F 1 "GND" V 9425 3525 50 0000 C CNN
F 2 "" H 9425 3725 60 0000 C CNN
F 3 "" H 9425 3725 60 0000 C CNN
1 9425 3725
0 -1 -1 0
$EndComp
$Comp
L power:GND #PWR0130
U 1 1 5E2C3597
P 9425 3600
F 0 "#PWR0130" H 9425 3350 50 0001 C CNN
F 1 "GND" V 9425 3400 50 0000 C CNN
F 2 "" H 9425 3600 60 0000 C CNN
F 3 "" H 9425 3600 60 0000 C CNN
1 9425 3600
0 -1 -1 0
$EndComp
$Comp
L power:GND #PWR0131
U 1 1 5E2C359D
P 9025 4375
F 0 "#PWR0131" H 9025 4125 50 0001 C CNN
F 1 "GND" V 9025 4175 50 0000 C CNN
F 2 "" H 9025 4375 60 0000 C CNN
F 3 "" H 9025 4375 60 0000 C CNN
1 9025 4375
0 -1 -1 0
$EndComp
$Comp
L Device:C_Small C1
U 1 1 5E2C35A3
P 8000 3600
F 0 "C1" V 7950 3675 50 0000 L CNN
F 1 "100n" V 8050 3375 50 0000 L CNN
F 2 "Capacitors_SMD:C_0402" V 8125 3550 30 0000 C CNN
F 3 "" H 8000 3600 60 0000 C CNN
1 8000 3600
-1 0 0 1
$EndComp
$Comp
L power:GND #PWR0133
U 1 1 5E2C35AA
P 8000 3775
F 0 "#PWR0133" H 8000 3525 50 0001 C CNN
F 1 "GND" V 8000 3575 50 0000 C CNN
F 2 "" H 8000 3775 60 0000 C CNN
F 3 "" H 8000 3775 60 0000 C CNN
1 8000 3775
1 0 0 -1
$EndComp
$Comp
L power:VDD #PWR0135
U 1 1 5E2C35B7
P 8000 3025
F 0 "#PWR0135" H 8000 2875 50 0001 C CNN
F 1 "VDD" H 8025 3175 50 0000 C CNN
F 2 "" H 8000 3025 60 0000 C CNN
F 3 "" H 8000 3025 60 0000 C CNN
1 8000 3025
1 0 0 -1
$EndComp
NoConn ~ 8700 4150
Wire Wire Line
8800 4375 8900 4375
Connection ~ 8900 4375
Wire Wire Line
8800 2650 8800 3150
Wire Wire Line
8900 4150 8900 4375
Wire Wire Line
8800 4375 8800 4150
Wire Wire Line
9350 3600 9425 3600
Wire Wire Line
8000 3125 8250 3125
Wire Wire Line
8700 3125 8700 3150
Wire Wire Line
8250 3125 8250 3600
Connection ~ 8250 3600
Wire Wire Line
8000 3700 8000 3775
Wire Wire Line
8000 3025 8000 3125
Wire Wire Line
9425 3725 9375 3725
Wire Wire Line
9375 3725 9375 3700
Wire Wire Line
9375 3700 9350 3700
Text Label 8950 2650 0 60 ~ 0
OPA_SPDT1_CTL
Wire Wire Line
8900 3150 8900 2650
Wire Wire Line
8900 2650 9650 2650
Wire Wire Line
5350 2650 5350 3475
Wire Wire Line
5600 3300 5600 3075
Wire Wire Line
4725 3775 5475 3775
Wire Wire Line
2175 3675 3725 3675
Connection ~ 3475 3475
Wire Wire Line
3475 3350 3475 3475
Connection ~ 6825 3575
Wire Wire Line
6825 3425 6825 3575
Wire Wire Line
3625 3775 3625 4000
Wire Wire Line
2750 3575 3725 3575
Wire Wire Line
3100 3475 3475 3475
Wire Wire Line
4725 3575 6825 3575
Wire Wire Line
7400 3675 4725 3675
Wire Wire Line
5350 3475 4725 3475
Wire Wire Line
2175 4025 2175 4125
Wire Wire Line
2175 3625 2175 3675
Wire Wire Line
6075 5450 6075 5550
Wire Wire Line
6075 5050 6075 5100
Connection ~ 6075 5100
Connection ~ 2175 3675
Text Label 6075 4100 3 60 ~ 0
VDD_OPA_PA
$Comp
L power:GND #PWR0136
U 1 1 5E2C3D0E
P 6075 5550
F 0 "#PWR0136" H 6075 5300 50 0001 C CNN
F 1 "GND" H 6075 5400 50 0000 C CNN
F 2 "" H 6075 5550 60 0000 C CNN
F 3 "" H 6075 5550 60 0000 C CNN
1 6075 5550
1 0 0 -1
$EndComp
$Comp
L Device:R R26
U 1 1 5E2C3D14
P 6075 5300
F 0 "R26" V 6125 5100 50 0000 C CNN
F 1 "100k" V 6075 5300 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 6200 5225 30 0000 C CNN
F 3 "" H 6075 5300 30 0000 C CNN
1 6075 5300
1 0 0 -1
$EndComp
$Comp
L Device:R R25
U 1 1 5E2C3D1B
P 6075 4900
F 0 "R25" V 6025 4700 50 0000 C CNN
F 1 "12k" V 6075 4900 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 5950 4825 30 0000 C CNN
F 3 "" H 6075 4900 30 0000 C CNN
1 6075 4900
-1 0 0 1
$EndComp
$Comp
L power:GND #PWR0137
U 1 1 5E2C3D22
P 2175 4125
F 0 "#PWR0137" H 2175 3875 50 0001 C CNN
F 1 "GND" H 2175 3975 50 0000 C CNN
F 2 "" H 2175 4125 60 0000 C CNN
F 3 "" H 2175 4125 60 0000 C CNN
1 2175 4125
1 0 0 -1
$EndComp
$Comp
L Device:R R24
U 1 1 5E2C3D28
P 2175 3875
F 0 "R24" V 2275 3875 50 0000 C CNN
F 1 "100k" V 2175 3875 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 2050 3800 30 0000 C CNN
F 3 "" H 2175 3875 30 0000 C CNN
1 2175 3875
1 0 0 -1
$EndComp
$Comp
L Device:R R23
U 1 1 5E2C3D2F
P 2175 3475
F 0 "R23" V 2075 3475 50 0000 C CNN
F 1 "12k" V 2175 3475 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 2300 3350 30 0000 C CNN
F 3 "" H 2175 3475 30 0000 C CNN
1 2175 3475
-1 0 0 1
$EndComp
$Comp
L power:GND #PWR0138
U 1 1 5E2C3D36
P 5600 3300
F 0 "#PWR0138" H 5600 3050 50 0001 C CNN
F 1 "GND" H 5600 3150 50 0000 C CNN
F 2 "" H 5600 3300 60 0000 C CNN
F 3 "" H 5600 3300 60 0000 C CNN
1 5600 3300
1 0 0 -1
$EndComp
$Comp
L Device:C_Small C41
U 1 1 5E2C3D3C
P 5600 2975
F 0 "C41" V 5650 3050 50 0000 L CNN
F 1 "100n" V 5650 2750 50 0000 L CNN
F 2 "Capacitors_SMD:C_0402" V 5725 2875 30 0000 C CNN
F 3 "" H 5600 2975 60 0000 C CNN
1 5600 2975
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR0139
U 1 1 5E2C3D43
P 3625 4000
F 0 "#PWR0139" H 3625 3750 50 0001 C CNN
F 1 "GND" H 3625 3850 50 0000 C CNN
F 2 "" H 3625 4000 60 0000 C CNN
F 3 "" H 3625 4000 60 0000 C CNN
1 3625 4000
1 0 0 -1
$EndComp
Text Label 5325 3675 2 60 ~ 0
DAC_OA1_FB
Text Label 3675 3575 2 60 ~ 0
DAC_OA0_FB
Text Label 5350 3775 2 60 ~ 0
DAC_OA1
Text Label 3325 3675 0 60 ~ 0
DAC_OA0
Text HLabel 3475 3350 1 60 Output ~ 0
RFPA_VCA
Text HLabel 6825 3425 1 60 Output ~ 0
RFPA_VCB
$Comp
L Device:R R22
U 1 1 5E2C3D4F
P 2750 3100
F 0 "R22" V 2800 2900 50 0000 C CNN
F 1 "DNP" V 2750 3100 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 2675 3075 30 0000 C CNN
F 3 "" H 2750 3100 30 0000 C CNN
1 2750 3100
-1 0 0 1
$EndComp
$Comp
L Device:R R21
U 1 1 5E2C3D56
P 2950 3475
F 0 "R21" V 3100 3450 50 0000 C CNN
F 1 "0" V 2950 3475 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 3025 3300 30 0000 C CNN
F 3 "" H 2950 3475 30 0000 C CNN
1 2950 3475
0 -1 -1 0
$EndComp
$Comp
L Device:R R36
U 1 1 5E2C3D5D
P 7125 3575
F 0 "R36" V 7050 3550 50 0000 C CNN
F 1 "0" V 7125 3575 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 7200 3450 30 0000 C CNN
F 3 "" H 7125 3575 30 0000 C CNN
1 7125 3575
0 1 1 0
$EndComp
$Comp
L Device:R R37
U 1 1 5E2C3D64
P 7400 3300
F 0 "R37" V 7325 3300 50 0000 C CNN
F 1 "DNP" V 7400 3300 50 0000 C CNN
F 2 "Resistors_SMD:R_0402" V 7500 3175 30 0000 C CNN
F 3 "" H 7400 3300 30 0000 C CNN
1 7400 3300
-1 0 0 1
$EndComp
Text Label 5275 3475 2 60 ~ 0
VDD_OPA_PA
$Comp
L RFIDr_Open_Lib:TSV358 U11
U 1 1 5E2C3D6C
P 3925 3275
F 0 "U11" H 4025 3225 60 0000 C CNN
F 1 "TSV358" H 4125 3325 60 0000 C CNN
F 2 "Housings_SSOP:TSSOP-8_4.4x3mm_Pitch0.65mm" H 4200 2625 30 0000 C CNN
F 3 "" H 3925 3275 60 0000 C CNN
1 3925 3275
1 0 0 -1
$EndComp
Wire Wire Line
2750 3475 2800 3475
Text HLabel 9650 2650 2 60 Input ~ 0
OPA_SPDT1_CTL
$Comp
L power:GND #PWR0142
U 1 1 5E281D7E
P 7400 3000
F 0 "#PWR0142" H 7400 2750 50 0001 C CNN
F 1 "GND" H 7400 2850 50 0000 C CNN
F 2 "" H 7400 3000 60 0000 C CNN
F 3 "" H 7400 3000 60 0000 C CNN
1 7400 3000
-1 0 0 1
$EndComp
Wire Wire Line
7400 3150 7400 3000
Wire Wire Line
2750 3250 2750 3475
Connection ~ 2750 3475
Wire Wire Line
3725 3775 3625 3775
Wire Wire Line
2175 2650 2175 3325
Text Label 2175 2750 3 60 ~ 0
VDD_OPA_PA
Wire Wire Line
7400 3450 7400 3575
Connection ~ 7400 3575
Wire Wire Line
7275 3575 7400 3575
Wire Wire Line
5600 2650 5600 2875
Wire Wire Line
5475 5100 6075 5100
Wire Wire Line
5475 3775 5475 5100
Wire Wire Line
6075 4000 6075 4750
Connection ~ 5350 2650
Wire Wire Line
7700 4000 6075 4000
Wire Wire Line
7700 2650 7700 4000
$Comp
L power:GND #PWR0143
U 1 1 5E283E42
P 2750 2875
F 0 "#PWR0143" H 2750 2625 50 0001 C CNN
F 1 "GND" H 2750 2725 50 0000 C CNN
F 2 "" H 2750 2875 60 0000 C CNN
F 3 "" H 2750 2875 60 0000 C CNN
1 2750 2875
-1 0 0 1
$EndComp
Wire Wire Line
2750 2875 2750 2950
Connection ~ 7700 2650
Wire Wire Line
2175 2650 5350 2650
$Comp
L RFIDr_Open_Lib:NLAS5223B U3
U 1 1 5E2C35B0
P 8450 2950
F 0 "U3" H 9050 2600 60 0000 C CNN
F 1 "NLAS5223B" H 9250 2700 60 0000 C CNN
F 2 "RFIDr_Open:WQFN-10" H 9375 2575 30 0000 C CNN
F 3 "" H 8450 2950 60 0000 C CNN
1 8450 2950
1 0 0 -1
$EndComp
Connection ~ 8000 3125
Connection ~ 8250 3125
Connection ~ 5600 2650
Wire Wire Line
8900 4375 9025 4375
Wire Wire Line
8250 3600 8250 3700
Wire Wire Line
3475 3475 3725 3475
Wire Wire Line
6825 3575 6975 3575
Wire Wire Line
6075 5100 6075 5150
Wire Wire Line
2175 3675 2175 3725
Wire Wire Line
2750 3475 2750 3575
Wire Wire Line
7400 3575 7400 3675
Wire Wire Line
5350 2650 5600 2650
Wire Wire Line
7700 2650 8800 2650
Wire Wire Line
8000 3125 8000 3500
Wire Wire Line
8250 3125 8700 3125
Wire Wire Line
5600 2650 7700 2650
Text Notes 1850 1850 0 100 ~ 0
Schematic Summary: PA BIAS Control\nIn this schematic, bias voltages for the PA are generated via resistor strings and unity-gain biased opamps. \nIt was intended in the future that the PA bias be made adjustable on-the-fly, but \nthis was a way it could be made easily adjustable by changing a resistor divider.\nThe resistive dividers could use capacitive decouping to ground at the output\nvoltage node, but tests have shown this makes no difference to reader performance.
Text Notes 8400 4825 0 100 ~ 0
Dual Solid-State\nSPDT Switches
Text Notes 3750 4150 0 100 ~ 0
Dual Opamps
Text Notes 6400 5250 0 100 ~ 0
Resistive Divider sets\nPA bias at about 2.7V.
Text Notes 1325 4750 0 100 ~ 0
Resistive Divider sets\nPA bias at about 2.7V.
Wire Notes Line
1775 850 1775 1925
Wire Notes Line
1775 1925 10425 1925
Wire Notes Line
10425 1925 10425 850
Wire Notes Line
10425 850 1775 850
$EndSCHEMATC
6d3b04536This file is pinned to the selected release. Download the original to open it in your design tool.