Continued design of entry-afe-characterization

azonenberg · Mar 17, 2020 · 22cc8ac · 22cc8ac
1 parent 181a53b
commit 22cc8ac
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Showing 5 changed files with 76 additions and 56 deletions.
diff --git a/boards/entry-afe-characterization/cm_shift.sch b/boards/entry-afe-characterization/cm_shift.sch
@@ -20,9 +20,11 @@ VGAIN_N
 Text HLabel 3050 2050 0    50   Input ~ 0
 GND
 Text Notes 3650 2500 0    50   ~ 0
-TODO: 8 dB single ended attenuator (0.398 V/V) on each leg
+TODO: single ended LMH6522 with +2 dB fixed gain\nand clipper circuit to keep output below 1.8V on both legs
 Text HLabel 4850 1750 2    50   Output ~ 0
 VOUT_P
 Text HLabel 4850 1850 2    50   Output ~ 0
 VOUT_N
+Text HLabel 3900 1900 0    50   Input ~ 0
+0V9_REF
 $EndSCHEMATC
diff --git a/boards/entry-afe-characterization/entry-afe-characterization.sch b/boards/entry-afe-characterization/entry-afe-characterization.sch
@@ -26,7 +26,7 @@ F0 "DAC" 50
 F1 "dac.sch" 50
 $EndSheet
 Text Notes 6350 3850 0    50   ~ 0
-SYSTEM GAIN CALCULATIONS\n\nHMCAD1520 wants 2V full scale\nIn 12-bit mode: 488 µV/LSB @ 0 dB gain\nIn 8-bit mode: 7.8 mV/LSB @ 0 dB gain\n\nMIN GAIN:\n10V input range, -13 dB system gain (0.2V/V)\n+2 dB gain on VGA\n12 bit mode: 2.4 mV/LSB\n8 bit mode: 39 mV/LSB\n\nMAX GAIN:\n502 mV input range, +12 dB system gain (3.98V/V)\n+26 dB gain on VGA\n12 bit mode: 122.6 µV/LSB\n8 bit mode: 1.95 mV/LSB
+SYSTEM GAIN CALCULATIONS\n\nHMCAD1520 wants 2V full scale\nIn 12-bit mode: 488 µV/LSB @ 0 dB gain\nIn 8-bit mode: 7.8 mV/LSB @ 0 dB gain\n\nMIN GAIN:\n10V input range, -13 dB system gain (0.2V/V)\n-9 dB gain on VGA\n12 bit mode: 2.4 mV/LSB\n8 bit mode: 39 mV/LSB\n\nMAX GAIN:\n159 mV input range, +22 dB system gain (12.59V/V)\n+26 dB gain on VGA\n12 bit mode: 38.7 µV/LSB\n8 bit mode: 619.5 µV/LSB
 $Sheet
 S 3900 5500 650  1750
 U 5E72E351
@@ -79,7 +79,7 @@ F3 "VSHIFTED_P" I L 4500 750 50
 F4 "VSHIFTED_N" I L 4500 850 50 
 F5 "VGAIN_P" O R 5650 750 50 
 F6 "VGAIN_N" O R 5650 850 50 
-F7 "2V25_REF" I L 4500 1150 50 
+F7 "2V5_REF" I L 4500 1150 50 
 $EndSheet
 Wire Wire Line
 	4500 750  3800 750 
@@ -104,26 +104,29 @@ VIN_FILTERED\n± 2.5V range\nNet gain = 0.5 V/V (-6 dB)
 Text Notes 2600 2050 0    50   ~ 0
 VSHIFTED\n0-5V range, 2.5V CM\nNet gain = 0.5V/V (-6 dB)\nVIN_OFFSET is ± 2.5V range
 Text Notes 4500 2050 0    50   ~ 0
-VGAIN\n2.25V CM\nNet gain = 0.177 - 10 V/V\n-15 to +20 dB
+VGAIN\n2.5V CM\nNet gain = 0.177 - 10 V/V\n-15 to +20 dB
 Text Label 4500 1150 2    50   ~ 0
-2V25_REF
+2V5_REF
 $Sheet
 S 6350 650  950  950 
 U 5E75B917
 F0 "Common mode shift" 50
 F1 "cm_shift.sch" 50
 F2 "VGAIN_P" I L 6350 750 50 
 F3 "VGAIN_N" I L 6350 850 50 
-F4 "GND" I L 6350 1050 50 
-F6 "VOUT_P" O R 7300 750 50 
-F7 "VOUT_N" O R 7300 850 50 
+F4 "GND" I L 6350 1150 50 
+F5 "VOUT_P" O R 7300 750 50 
+F6 "VOUT_N" O R 7300 850 50 
+F7 "0V9_REF" I L 6350 1050 50 
 $EndSheet
 Wire Wire Line
 	6350 750  5650 750 
 Wire Wire Line
 	5650 850  6350 850 
-Text Label 6350 1050 2    50   ~ 0
+Text Label 6350 1150 2    50   ~ 0
 GND
 Text Notes 6350 2050 0    50   ~ 0
-VOUT\n895 mV CM\nNet gain = 0.071 - 3.98 V/V\n-23 to +12 dB
+VOUT\n900 mV CM\nNet gain = 0.223 - 12.59 V/V\n-13 to +22 dB
+Text Label 6350 1050 2    50   ~ 0
+0V9_REF
 $EndSCHEMATC
diff --git a/boards/entry-afe-characterization/gainstage.sch b/boards/entry-afe-characterization/gainstage.sch
@@ -18,8 +18,8 @@ L analog-azonenberg:ADL5205 U?
 U 2 1 5E744B89
 P 2800 2700
 AR Path="/5E744B89" Ref="U?"  Part="2" 
-AR Path="/5E743C43/5E744B89" Ref="U?"  Part="2" 
-F 0 "U?" H 3325 3325 50  0000 C CNN
+AR Path="/5E743C43/5E744B89" Ref="U2"  Part="2" 
+F 0 "U2" H 3325 3325 50  0000 C CNN
 F 1 "ADL5205" H 3325 3234 50  0000 C CNN
 F 2 "" H 2800 2750 50  0001 C CNN
 F 3 "" H 2800 2750 50  0001 C CNN
@@ -31,8 +31,8 @@ L analog-azonenberg:ADL5205 U?
 U 3 1 5E744B8F
 P 2800 1850
 AR Path="/5E744B8F" Ref="U?"  Part="3" 
-AR Path="/5E743C43/5E744B8F" Ref="U?"  Part="3" 
-F 0 "U?" H 3325 2475 50  0000 C CNN
+AR Path="/5E743C43/5E744B8F" Ref="U2"  Part="3" 
+F 0 "U2" H 3325 2475 50  0000 C CNN
 F 1 "ADL5205" H 3325 2384 50  0000 C CNN
 F 2 "" H 2800 1900 50  0001 C CNN
 F 3 "" H 2800 1900 50  0001 C CNN
@@ -44,8 +44,8 @@ L analog-azonenberg:ADL5205 U?
 U 1 1 5E748048
 P 9250 6100
 AR Path="/5E748048" Ref="U?"  Part="1" 
-AR Path="/5E743C43/5E748048" Ref="U?"  Part="1" 
-F 0 "U?" H 9825 8125 50  0000 C CNN
+AR Path="/5E743C43/5E748048" Ref="U2"  Part="1" 
+F 0 "U2" H 9825 8125 50  0000 C CNN
 F 1 "ADL5205" H 9825 8034 50  0000 C CNN
 F 2 "" H 9250 6150 50  0001 C CNN
 F 3 "" H 9250 6150 50  0001 C CNN
@@ -67,21 +67,21 @@ Break unused amp channel out to SMAs
 Text Label 2700 2300 2    50   ~ 0
 GAIN_PWRUP
 $Comp
-L Connector:Conn_Coaxial J?
+L Connector:Conn_Coaxial J3
 U 1 1 5E74ED29
 P 1550 2650
-F 0 "J?" H 1400 2600 50  0000 C CNN
+F 0 "J3" H 1400 2600 50  0000 C CNN
 F 1 "SMA" H 1400 2500 50  0000 C CNN
 F 2 "" H 1550 2650 50  0001 C CNN
 F 3 "" H 1550 2650 50  0001 C CNN
 	1    1550 2650
 	-1   0    0    -1  
 $EndComp
 $Comp
-L Connector:Conn_Coaxial J?
+L Connector:Conn_Coaxial J2
 U 1 1 5E750662
 P 1550 2450
-F 0 "J?" H 1400 2400 50  0000 C CNN
+F 0 "J2" H 1400 2400 50  0000 C CNN
 F 1 "SMA" H 1400 2300 50  0000 C CNN
 F 2 "" H 1550 2450 50  0001 C CNN
 F 3 "" H 1550 2450 50  0001 C CNN
@@ -98,15 +98,13 @@ Wire Wire Line
 	1700 2450 1800 2450
 Text Label 2200 2600 0    50   ~ 0
 GIN_N
-Text HLabel 3950 1450 2    50   Input ~ 0
-2V25_REF
 Text Label 3950 2300 0    50   ~ 0
-2V25_REF
+2V5_REF
 $Comp
-L Connector:Conn_Coaxial J?
+L Connector:Conn_Coaxial J4
 U 1 1 5E753967
 P 4750 2450
-F 0 "J?" H 4600 2400 50  0000 C CNN
+F 0 "J4" H 4600 2400 50  0000 C CNN
 F 1 "SMA" H 4600 2300 50  0000 C CNN
 F 2 "" H 4750 2450 50  0001 C CNN
 F 3 "" H 4750 2450 50  0001 C CNN
@@ -128,10 +126,10 @@ Wire Wire Line
 Wire Wire Line
 	1350 2250 1550 2250
 $Comp
-L Connector:Conn_Coaxial J?
+L Connector:Conn_Coaxial J5
 U 1 1 5E7562B4
 P 4750 2650
-F 0 "J?" H 4600 2600 50  0000 C CNN
+F 0 "J5" H 4600 2600 50  0000 C CNN
 F 1 "SMA" H 4600 2500 50  0000 C CNN
 F 2 "" H 4750 2650 50  0001 C CNN
 F 3 "" H 4750 2650 50  0001 C CNN
@@ -162,4 +160,6 @@ Text Label 4050 2500 0    50   ~ 0
 GOUT_P
 Text Label 4050 2600 0    50   ~ 0
 GOUT_N
+Text HLabel 3950 1450 2    50   Input ~ 0
+2V5_REF
 $EndSCHEMATC
diff --git a/boards/entry-afe-characterization/input.sch b/boards/entry-afe-characterization/input.sch
@@ -18,8 +18,8 @@ L Connector:Conn_Coaxial J?
 U 1 1 5E73BA4F
 P 2650 3450
 AR Path="/5E73BA4F" Ref="J?"  Part="1" 
-AR Path="/5E7383DD/5E73BA4F" Ref="J?"  Part="1" 
-F 0 "J?" H 2603 3688 50  0000 C CNN
+AR Path="/5E7383DD/5E73BA4F" Ref="J1"  Part="1" 
+F 0 "J1" H 2603 3688 50  0000 C CNN
 F 1 "SMA" H 2603 3597 50  0000 C CNN
 F 2 "" H 2650 3450 50  0001 C CNN
 F 3 "" H 2650 3450 50  0001 C CNN
@@ -33,8 +33,8 @@ L device:D_TVS D?
 U 1 1 5E73BA57
 P 4750 3600
 AR Path="/5E73BA57" Ref="D?"  Part="1" 
-AR Path="/5E7383DD/5E73BA57" Ref="D?"  Part="1" 
-F 0 "D?" V 4704 3679 50  0000 L CNN
+AR Path="/5E7383DD/5E73BA57" Ref="D1"  Part="1" 
+F 0 "D1" V 4704 3679 50  0000 L CNN
 F 1 "TPD1E05U06DPYR" V 4795 3679 50  0000 L CNN
 F 2 "" H 4750 3600 50  0001 C CNN
 F 3 "https://en.wikipedia.org/wiki/Transient-voltage-suppression_diode" H 4750 3600 50  0001 C CNN
@@ -56,8 +56,8 @@ L device:R R?
 U 1 1 5E73BA63
 P 3450 3600
 AR Path="/5E73BA63" Ref="R?"  Part="1" 
-AR Path="/5E7383DD/5E73BA63" Ref="R?"  Part="1" 
-F 0 "R?" H 3520 3646 50  0000 L CNN
+AR Path="/5E7383DD/5E73BA63" Ref="R1"  Part="1" 
+F 0 "R1" H 3520 3646 50  0000 L CNN
 F 1 "FIXME" H 3520 3555 50  0000 L CNN
 F 2 "" V 3380 3600 50  0001 C CNN
 F 3 "" H 3450 3600 50  0001 C CNN
@@ -69,8 +69,8 @@ L device:R R?
 U 1 1 5E73BA69
 P 4100 3600
 AR Path="/5E73BA69" Ref="R?"  Part="1" 
-AR Path="/5E7383DD/5E73BA69" Ref="R?"  Part="1" 
-F 0 "R?" H 4170 3646 50  0000 L CNN
+AR Path="/5E7383DD/5E73BA69" Ref="R3"  Part="1" 
+F 0 "R3" H 4170 3646 50  0000 L CNN
 F 1 "FIXME" H 4170 3555 50  0000 L CNN
 F 2 "" V 4030 3600 50  0001 C CNN
 F 3 "" H 4100 3600 50  0001 C CNN
@@ -82,8 +82,8 @@ L device:R R?
 U 1 1 5E73BA6F
 P 3850 3450
 AR Path="/5E73BA6F" Ref="R?"  Part="1" 
-AR Path="/5E7383DD/5E73BA6F" Ref="R?"  Part="1" 
-F 0 "R?" V 3643 3450 50  0000 C CNN
+AR Path="/5E7383DD/5E73BA6F" Ref="R2"  Part="1" 
+F 0 "R2" V 3643 3450 50  0000 C CNN
 F 1 "FIXME" V 3734 3450 50  0000 C CNN
 F 2 "" V 3780 3450 50  0001 C CNN
 F 3 "" H 3850 3450 50  0001 C CNN
@@ -102,8 +102,8 @@ L device:C C?
 U 1 1 5E73BA79
 P 7200 3600
 AR Path="/5E73BA79" Ref="C?"  Part="1" 
-AR Path="/5E7383DD/5E73BA79" Ref="C?"  Part="1" 
-F 0 "C?" H 7315 3646 50  0000 L CNN
+AR Path="/5E7383DD/5E73BA79" Ref="C1"  Part="1" 
+F 0 "C1" H 7315 3646 50  0000 L CNN
 F 1 "31.83 pF" H 7315 3555 50  0000 L CNN
 F 2 "" H 7238 3450 50  0001 C CNN
 F 3 "" H 7200 3600 50  0001 C CNN
@@ -115,8 +115,8 @@ L device:C C?
 U 1 1 5E73BA7F
 P 8150 3600
 AR Path="/5E73BA7F" Ref="C?"  Part="1" 
-AR Path="/5E7383DD/5E73BA7F" Ref="C?"  Part="1" 
-F 0 "C?" H 8265 3646 50  0000 L CNN
+AR Path="/5E7383DD/5E73BA7F" Ref="C2"  Part="1" 
+F 0 "C2" H 8265 3646 50  0000 L CNN
 F 1 "31.83 pF" H 8265 3555 50  0000 L CNN
 F 2 "" H 8188 3450 50  0001 C CNN
 F 3 "" H 8150 3600 50  0001 C CNN
@@ -128,8 +128,8 @@ L device:L L?
 U 1 1 5E73BA85
 P 7700 3450
 AR Path="/5E73BA85" Ref="L?"  Part="1" 
-AR Path="/5E7383DD/5E73BA85" Ref="L?"  Part="1" 
-F 0 "L?" V 7519 3450 50  0000 C CNN
+AR Path="/5E7383DD/5E73BA85" Ref="L1"  Part="1" 
+F 0 "L1" V 7519 3450 50  0000 C CNN
 F 1 "159 nH" V 7610 3450 50  0000 C CNN
 F 2 "" H 7700 3450 50  0001 C CNN
 F 3 "" H 7700 3450 50  0001 C CNN

diff --git a/boards/entry-afe-characterization/offset.sch b/boards/entry-afe-characterization/offset.sch
@@ -13,7 +13,7 @@ Comment2 "Andrew D. Zonenberg"
 Comment3 ""
 Comment4 ""
 $EndDescr
-Text HLabel 4450 3400 0    50   Input ~ 0
+Text HLabel 3200 3400 0    50   Input ~ 0
 VIN_FILTERED
 Text Notes 5450 4450 0    50   ~ 0
 ± 2.5V input\n0-5V output, 2.5V common mode\nNet gain = -0.5 (-6 db)\nVoffset is +/- 2.5V range
@@ -26,8 +26,8 @@ L analog-azonenberg:LMH6552 U?
 U 1 1 5E73FCE0
 P 5450 3650
 AR Path="/5E73FCE0" Ref="U?"  Part="1" 
-AR Path="/5E73DF00/5E73FCE0" Ref="U?"  Part="1" 
-F 0 "U?" H 5875 4647 60  0000 C CNN
+AR Path="/5E73DF00/5E73FCE0" Ref="U1"  Part="1" 
+F 0 "U1" H 5875 4647 60  0000 C CNN
 F 1 "LMH6552" H 5875 4541 60  0000 C CNN
 F 2 "" H 4950 3600 60  0000 C CNN
 F 3 "" H 4950 3600 60  0000 C CNN
@@ -39,23 +39,21 @@ L device:R R?
 U 1 1 5E73FCEA
 P 4650 3400
 AR Path="/5E73FCEA" Ref="R?"  Part="1" 
-AR Path="/5E73DF00/5E73FCEA" Ref="R?"  Part="1" 
-F 0 "R?" V 4550 3350 50  0000 C CNN
+AR Path="/5E73DF00/5E73FCEA" Ref="R5"  Part="1" 
+F 0 "R5" V 4550 3350 50  0000 C CNN
 F 1 "200 0.1%" V 4550 3650 50  0000 C CNN
 F 2 "" V 4580 3400 50  0001 C CNN
 F 3 "" H 4650 3400 50  0001 C CNN
 	1    4650 3400
 	0    1    1    0   
 $EndComp
-Wire Wire Line
-	4450 3400 4500 3400
 $Comp
 L device:R R?
 U 1 1 5E73FCF2
 P 4650 3500
 AR Path="/5E73FCF2" Ref="R?"  Part="1" 
-AR Path="/5E73DF00/5E73FCF2" Ref="R?"  Part="1" 
-F 0 "R?" V 4750 3450 50  0000 C CNN
+AR Path="/5E73DF00/5E73FCF2" Ref="R6"  Part="1" 
+F 0 "R6" V 4750 3450 50  0000 C CNN
 F 1 "200 0.1%" V 4750 3750 50  0000 C CNN
 F 2 "" V 4580 3500 50  0001 C CNN
 F 3 "" H 4650 3500 50  0001 C CNN
@@ -71,8 +69,8 @@ L device:R R?
 U 1 1 5E73FCFA
 P 5450 3750
 AR Path="/5E73FCFA" Ref="R?"  Part="1" 
-AR Path="/5E73DF00/5E73FCFA" Ref="R?"  Part="1" 
-F 0 "R?" V 5550 3700 50  0000 C CNN
+AR Path="/5E73DF00/5E73FCFA" Ref="R7"  Part="1" 
+F 0 "R7" V 5550 3700 50  0000 C CNN
 F 1 "200 0.1%" V 5550 4000 50  0000 C CNN
 F 2 "" V 5380 3750 50  0001 C CNN
 F 3 "" H 5450 3750 50  0001 C CNN
@@ -97,8 +95,8 @@ L device:R R?
 U 1 1 5E73FD07
 P 5450 3950
 AR Path="/5E73FD07" Ref="R?"  Part="1" 
-AR Path="/5E73DF00/5E73FD07" Ref="R?"  Part="1" 
-F 0 "R?" V 5550 3900 50  0000 C CNN
+AR Path="/5E73DF00/5E73FD07" Ref="R8"  Part="1" 
+F 0 "R8" V 5550 3900 50  0000 C CNN
 F 1 "200 0.1%" V 5550 4200 50  0000 C CNN
 F 2 "" V 5380 3950 50  0001 C CNN
 F 3 "" H 5450 3950 50  0001 C CNN
@@ -134,4 +132,21 @@ Text HLabel 6500 2900 2    50   Input ~ 0
 GND
 Text HLabel 6500 3000 2    50   Input ~ 0
 2V5_REF
+$Comp
+L device:R R4
+U 1 1 5E75EDF9
+P 3200 3550
+F 0 "R4" H 3270 3596 50  0000 L CNN
+F 1 "50" H 3270 3505 50  0000 L CNN
+F 2 "" V 3130 3550 50  0001 C CNN
+F 3 "" H 3200 3550 50  0001 C CNN
+	1    3200 3550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3200 3400 4500 3400
+Text Label 3050 3700 2    50   ~ 0
+GND
+Wire Wire Line
+	3050 3700 3200 3700
 $EndSCHEMATC