4 layers63.5 × 31.8 mm
Bandit Dev Platform
4n3m4i1/Bode_Analyzer
Low Cost, High Speed, User Friendly Transfer Function Characterization Tool
137 parts1BSD-2-Clause
2 layers75 × 80 mm
Filter Under Test Reference
4n3m4i1/Bode_Analyzer1Low Cost, High Speed, User Friendly Transfer Function Characterization Tool
- Size
- 75 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 53
- Nets
- 28
- Pads
- 116
- Tracks, vias
- 147, 64
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 18 Sep 2023
- Updated
- 6 May 2024
Overview
Filter Under Test Reference is an open-source printed circuit board by 4n3m4i1, from the 4n3m4i1/Bode_Analyzer repository on GitHub, published under the BSD-2-Clause licence. It is a 2-layer board of 75 × 80 mm with 53 parts on 28 nets, routed with 147 tracks and 64 vias.
Its parts include 15 capacitors, 10 resistors, 8 connectors, 1 IC and 1 inductor.
README
README.mdBode Bandits Analysis Tool
The Bode Bandits Analysis Tool provides frequency response characteristics of a multitude of filters. A Python GUI allows interface with the tool, providing configuration and visual representations of the measured transfer function.
Hardware
Board and assembly files are provided in the repository, optimized for JLC's PCBA service.
Methods
The Least Mean Squared (LMS) adaptive filter methodology is implemented in a semi-real time fashion, allowing rapid characterization cycles to be made.
All algorithms (LMS, FFT, Downsampling) are fully parametric, and largely user selectable on the fly. Automatic self-calibration corrects for
component tolerance variations, VDDA magnitude, and the frontend anti-aliasing filter transfer function. DC calibration routines are run at
startup, all transfer function calibration metrics are gathered at startup as well as upon change of any parametric setting.
Real Time Adjustment Parameters
- Range of frequency analysis (set ranges)
- Datapoint resolution (2^n)
- Acceptable LMS convergence error tolerances
Required User Software
- Python 3.9+
- That's it :)
Repo Layout
- App: Contains the PC side of the project. Including the Python source and helper tools.
- HDL: Placeholder for potential HDL in the event a switch to a more PL based approach occurs.
- src: All C source for both the current main build as well as helper C files and feature tests.
- Documentation: All standard documentation as well as theory behind every working component, with test programs and scrips included.
Parts
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | Jumper_2_Open | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP10, JP11, JP12, JP13, JP14, JP15, JP16, JP17 +1 |
| 11 | C_Small | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2, C5, C6, C7, C8, C9, C10, C11, C12, C13 |
| 10 | R_Small_US | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 |
| 3 | Conn_01x01_Pin | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J6, J7, J8 |
| 3 | Conn_01x01_Socket | BANDIT_PCB_Lib:Keystone 575 Banana | J1, J4, J5 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C15 |
| 2 | 1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C14 |
| 2 | Conn_Coaxial | ADS8584SIPM:BNC_THT | J2, J3 |
| 1 | L | Inductor_THT:L_Axial_L5.3mm_D2.2mm_P7.62mm_Horizontal_Vishay_IM-1 | L1 |
| 1 | LOGO | BANDIT_PCB_Lib:Logo_50mm_Light | G*** |
| 1 | TL074 | BANDIT_PCB_Lib:SOT23 Thin 14 | U1 |
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Questions
How big is the Filter Under Test Reference PCB?
It measures 75 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Filter Under Test Reference use?
53 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Filter Under Test Reference KiCad files?
From the 4n3m4i1/Bode_Analyzer repository on GitHub, at the commit this page was made from: the board is PCB/Filter_Under_Test/Filter_Under_Test_Reference/Filter_Under_Test_Reference.kicad_pcb and its schematic PCB/ADS7253_Breakout/ads7253_breakout/ads7253_breakout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Filter Under Test Reference design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).