Introduction A Late Nineties PC Assessing the Damage Installing a Video Card and Keyboard Locked CPU Fan Replace the BIOS Backup Battery Replacing the Motherboard Capacitors Replacing the Spinning Disk Hard Drive with a CompactFlash Drive Digital Configuration Architecture of the Signal Generation Board Installing Firmware - The Official Way Installation Alternative 1: Floppy Drive Emulator…
Introduction A Galois Field Introduction by Example Base Galois Fields A Real World Example of a Base Galois Field GF(2) Extended Galois Fields Extended Galois Field Addition Extended Galois Field Multiplication A Field Defining Irreducible Polynomial A Primitive Polynomial From Abstract Alpha to a Real Value Selecting Primitive Polynomials The Benefit of Primitive Polynomials Linear Feedback…
Or better: the fun and the unsatisfying way…
In the end, it comes down to fixing two early 2000s PCs…
Introduction A Bluetooth LE Trace as Example Input Complex Heterodyne Derivation of Post-Decimation Offset Correction Simplifying for the Half-Bin Offset Case The Odd Case of an Odd Number of Channels Reducing the Number of Phase Adjustment Values Conclusion References Footnotes Introduction In previous blog post, I introduced the polyphase channelizer , a DSP algorithm that is incredibly…
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Introduction Some Common DSP Notations Sampling with 1 ADC Creates a Real Signal Heterodyning the Signal to Baseband the Wrong Way Complex Heterodyne to the Rescue Filtering Away the Old Negative Image Decimation Final Block Diagram Conclusion Afterthought: the Fourier Transform is a Bunch of Averaged Complex Heterodynes References Footnotes Introduction In my previous blog post about polyphase…
Introduction The Decimation and Anti-Aliasing FIR Filter Combo Naive Hardware Implementation Reduce number of calculations - Move decimator before multiplier Polyphase decomposition of the original filter The Noble Identity for Decimation Reusing Common Hardware in the Fast Clock Domain Delayed multiplications instead of delayed inputs Conclusion References Footnotes Introduction I’ve been reading…
Introduction The Stanford Research Systems DG535 Who Uses a Pulse Delay Generator? Inside the DG535 The Annoying Mechanical Design of the DG535 It’s Always the Power Supply Power Architecture of the DG535 The How, Why, and Please Don’t of Current Boost Resistor Circuits Root Causing the DG535 Issue Debugging the +7V Issue Side Quest: Debugging the CPU System - Connector Stupidity Fixing the Burnt…
Introduction The TDS220 Oscilloscope Opening Up the TDS220 Common TDS220 issues Replacing the power supply capacitors LCD Panel Corruption Extracting the LCD Panel LCD Panel Capacitor Replacement LCD Panel Backlight Replacement Fixing the Square Wave Issue Conclusion References Footnotes Introduction I found a Tektronix TDS220 oscilloscope at the Silicon Valley Electronics Flea Market . The seller…