notes on overall gain.

3884fb0b · Anders Wallin · 1ac7319f · 3884fb0b · 3884fb0b
Commit 3884fb0b authored Mar 02, 2018 by Anders Wallin
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Showing with 11 additions and 9 deletions

fda_2017.03.sch fda_2017.03/fda_2017.03.sch +7 -5

output_stage.sch fda_2017.03/output_stage.sch +4 -4

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--- a/fda_2017.03/fda_2017.03.sch
+++ b/fda_2017.03/fda_2017.03.sch
@@ -74,7 +74,7 @@ L R R101
 U 1 1 5654DA6F
 P 2250 2350
 F 0 "R101" V 2330 2350 50  0000 C CNN
-F 1 "49R9" V 2250 2350 50  0000 C CNN
+F 1 "51R" V 2250 2350 50  0000 C CNN
 F 2 "Resistors_SMD:R_0805" V 2180 2350 30  0001 C CNN
 F 3 "" H 2250 2350 30  0000 C CNN
 	1    2250 2350
@@ -248,8 +248,8 @@ F 3 "" H 3150 2350 30  0000 C CNN
 	1    3150 2350
 	-1   0    0    -1  
 $EndComp
-Text Notes 650  3150 0    60   ~ 0
+Text Notes 750  3300 0    60   ~ 0
-+20 dBm input is 6.324Vpp or 100mW\n0805-sized resistor should be OK to 125 mW
+Input Power:\n+20 dBm input is 6.324Vpp or 100mW\n0805-sized resistor should be OK to 125 mW\n\nInput Impedance:\n51R in parallell with 2k010 gives Z_in = 49R7
 Wire Wire Line
 	3150 2550 3900 2550
 Wire Wire Line
@@ -581,8 +581,8 @@ Wire Wire Line
 	2550 5300 2750 5300
 Wire Wire Line
 	2550 5100 2750 5100
-Text Notes 2150 3750 0    60   ~ 0
+Text Notes 750  3750 0    60   ~ 0
-input-stage: LMH6702, \noutput-stage: LMH6609, 
+Op-Amps:\ninput-stage: LMH6702, \noutput-stage: LMH6609, 
 $Sheet
 S 7300 3850 1050 200 
 U 57DA795D
@@ -716,4 +716,6 @@ Wire Notes Line
 	2500 6550 3400 6550
 Text Notes 2550 6900 0    60   ~ 0
 Note: front-edge M3 mounting holes removed\nas of 2018-01 design revision (to make room for THT LEDs)
+Text Notes 9150 3700 0    60   ~ 0
+Overall Gain:\nInput Impedance:  ca 0 dB\nInput divider R102/R103: -0.04 dB\nU101 gain: +6.25 dB\nR201/202 divider: -6.06 dB\nU201 gain: +6.02 dB\noutput impedance: -6.04 dB\n\nTotal +0.12 dB
 $EndSCHEMATC
--- a/fda_2017.03/output_stage.sch
+++ b/fda_2017.03/output_stage.sch
@@ -78,7 +78,7 @@ AR Path="/56587A93/5654CEA7" Ref="R706"  Part="1"
 AR Path="/56587AB2/5654CEA7" Ref="R806"  Part="1" 
 AR Path="/57DA795D/5654CEA7" Ref="R1006"  Part="1" 
 F 0 "R206" V 6230 3300 50  0000 C CNN
-F 1 "51R" V 6150 3300 50  0000 C CNN
+F 1 "49R9" V 6150 3300 50  0000 C CNN
 F 2 "Resistors_SMD:R_0805" V 6080 3300 30  0001 C CNN
 F 3 "" H 6150 3300 30  0000 C CNN
 	1    6150 3300
@@ -638,7 +638,7 @@ AR Path="/56587A93/58B925F2" Ref="R709"  Part="1"
 AR Path="/56587AB2/58B925F2" Ref="R809"  Part="1" 
 AR Path="/57DA795D/58B925F2" Ref="R1009"  Part="1" 
 F 0 "R209" V 6880 3300 50  0000 C CNN
-F 1 "DNI" V 6800 3300 50  0000 C CNN
+F 1 "0R" V 6800 3300 50  0000 C CNN
 F 2 "Resistors_SMD:R_0805" V 6730 3300 30  0001 C CNN
 F 3 "" H 6800 3300 30  0000 C CNN
 	1    6800 3300
@@ -765,8 +765,8 @@ Wire Notes Line
 	11150 6400 6950 6400
 Wire Notes Line
 	6950 6400 6950 5450
-Text Notes 6600 3100 0    60   ~ 0
+Text Notes 6350 3150 0    60   ~ 0
-R209 is 100nF cap\nfor AC-coupled Output
+R209: use 100nF cap\nfor AC-coupled Output
 Text Notes 2350 4650 0    60   ~ 0
 C206 is used to limit gain-peaking \nand BW variations among the 8 outputs.\n\nRC-filter with R201\nC206 = 5 pF limits BW to ca 30 MHz 
 $EndSCHEMATC