Design of a Hybrid 4th order Linkwitz-Riley Crossover Filter

This repository contains the complete design, sizing, schematic capture, and automated verification framework for a high-performance Two-Stage Miller-Compensated Operational Transconductance Amplifier (OTA). Optimized using the $g_m/I_D$ methodology, this amplifier serves as the core operational block for an hybrid Linkwitz-Riley 4th-order (LR4) active crossover filter system.

The course makes heavy use of circuit simulation, using Xschem for schematic entry and ngspice for simulation. The 130nm CMOS technology SG13G2 from IHP Microelectronics is used.

Tools and PDK are integrated in the IIC-OSIC-TOOLS Docker image.

This work takes heavy inspiration from Analog Circuit Design course.

All material is made publicly available, to access a detailed report on the same click report

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📂 Repository Structure

The project is organized linearly following a modern analog IC design flow, spanning from high-level behavioral models down to automated PVT verification:

├── Behavioural Model/  # LTspice behavioural model simulation of the LR4 crossover filter
├── xschem/             # Schematic files (.sch) and testbenches for the 2-Stage OTA
├── gmid/               # Sizing scripts (.ipynb) leveraging the gm/ID methodology
├── cace/               # Automated PVT and MC simulation scripts, specification targets, and results