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My implementation of Ultra Low Noise Preamplifier and RMS Meter
My implementation of Ultra Low Noise Preamplifier and RMS Meter
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Old 15th March 2014, 02:45 PM   #11
gnomcat is offline gnomcat  Bulgaria
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Quote:
Originally Posted by AndrewT View Post
.....
Is that the 1.11 you are using?
I expected a correction of around 1.6
1.57 1-pole
1.11 2-pole butterworth
1.05 3-pole butterworth
1.00 Brick Wall

My is butterworth

Last edited by gnomcat; 15th March 2014 at 02:49 PM.
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Old 15th March 2014, 03:01 PM   #12
gnomcat is offline gnomcat  Bulgaria
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Default New attachment of all photos

PCB
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File Type: jpg PCB_bottom.jpg (173.0 KB, 382 views)
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Old 15th March 2014, 03:05 PM   #13
gnomcat is offline gnomcat  Bulgaria
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Inside
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File Type: jpg component_top3.jpg (354.0 KB, 319 views)
File Type: jpg inside_1.jpg (440.0 KB, 111 views)
File Type: jpg inside_2.jpg (259.1 KB, 141 views)
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File Type: jpg inside_4.jpg (267.3 KB, 85 views)
File Type: jpg A-weight.jpg (441.8 KB, 77 views)
File Type: jpg LTC1968.jpg (245.5 KB, 85 views)
File Type: jpg galette_shield.jpg (322.8 KB, 105 views)
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Old 15th March 2014, 03:07 PM   #14
gnomcat is offline gnomcat  Bulgaria
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Front
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File Type: jpg panels.jpg (84.9 KB, 125 views)
File Type: jpg front_1.jpg (143.6 KB, 141 views)
File Type: jpg front_2.jpg (170.1 KB, 122 views)
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Old 15th March 2014, 03:13 PM   #15
gnomcat is offline gnomcat  Bulgaria
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LNA noise measurement with Agilent 34410A:
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Old 15th March 2014, 03:15 PM   #16
gnomcat is offline gnomcat  Bulgaria
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LNA noise measurement with Multi-Instruments
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Old 15th March 2014, 03:17 PM   #17
gnomcat is offline gnomcat  Bulgaria
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LNA measurement with Spectrum Alalyzer
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File Type: jpg RMS_noise_50ohm_100kHz_gain80db.jpg (440.3 KB, 65 views)
File Type: jpg noise_power_density_50ohm_100kHz_gain80dB.jpg (431.1 KB, 67 views)
File Type: jpg dbm_50ohm_gain80dB.jpg (417.0 KB, 58 views)
File Type: jpg magnitude.jpg (405.5 KB, 50 views)
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Old 15th March 2014, 03:19 PM   #18
gnomcat is offline gnomcat  Bulgaria
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STEP RESPONSE at: 10kHz, 100kHz, 500kHz, 1MHz
Attached Images
File Type: jpg 10kHz_step_response_gain80dB.jpg (349.2 KB, 63 views)
File Type: jpg 100kHz_step_response_gain80dB.jpg (350.6 KB, 59 views)
File Type: jpg 500kHz_step_response_gain80dB.jpg (350.3 KB, 50 views)
File Type: jpg 1MHz_step_response_gain80dB.jpg (357.1 KB, 54 views)
File Type: jpg attenuators.jpg (340.0 KB, 61 views)
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Old 15th March 2014, 03:21 PM   #19
gnomcat is offline gnomcat  Bulgaria
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RMS Meter
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File Type: jpg RMSmeter_DC.jpg (327.0 KB, 64 views)
File Type: jpg RMSmeter_100kHz_350mvRMS.jpg (300.0 KB, 71 views)
File Type: jpg RMSmeter_500kHz_350mVRMS.jpg (301.3 KB, 55 views)
File Type: jpg RMSmeter_1MHz_350mVRMS.jpg (304.7 KB, 39 views)
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Old 15th March 2014, 03:33 PM   #20
gnomcat is offline gnomcat  Bulgaria
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@AndrewT
Is this properly?
If my coefficient is 1.1
3.62mVrms/1.1 = 3.29mVRMS
3.29mVrms/10000 = 329nVrms (Referred to Input) ?
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