Redesigned the electrical readout interface for a multi-sensor endovascular guidewire (4 pressure sensors) to monitor blood flow dynamics. The project focused on optimizing signal integrity and migrating the system to a custom PCB architecture.
Readout Circuit for Endovascular Microsensors
Objective
Key Contributions
- Analog Signal Chain: Validated a signal conditioning path using Instrumentation Amplifiers (AD623) and 8th-order Switched-Capacitor Filters (MAX7403) to amplify and clean micro-volt sensor outputs.
- Architecture Optimization: Conducted rigorous characterization of the existing architecture, identifying critical limitations. Re-engineered the circuit topology to ensure data acquisition across all 4 channels.
- MCU Migration (STM32): Migrated logic from Arduino to an STM32 microcontroller to leverage higher processing speeds, expanded memory, and advanced peripheral capabilities.
- PCB Design: Designed a custom Printed Circuit Board (PCB) integrating the new analog chain and MCU.
Visuals
Fig 1. PCB Design
Fig 2. Signal Path
Fig 3. PCB Blocks
Fig 1. PCB Design
Fig 2. Signal Path
Fig 3. PCB Blocks
