v0.1.0 — Xyce simulator support

What's New

• Xyce simulator support — Use simulator="xyce" on AnalogBlock to run co-simulation with Xyce instead of ngspice
• SimulatorInterface abstraction — Common base class for ngspice and Xyce backends
• Simulator-aware netlist generation — Xyce netlists use YDAC devices, .TRAN, .PRINT TRAN
• simulator_lib parameter on MixedSignalBridge (replaces ngspice_lib, which is now deprecated)
• Removed deprecated sync_period_ns parameter

Usage

# ngspice (unchanged, default)
block = AnalogBlock(name="dut", spice_file="circuit.sp", subcircuit="my_block", ...)

# Xyce
block = AnalogBlock(name="dut", spice_file="circuit.sp", subcircuit="my_block",
                    simulator="xyce", ...)
bridge = MixedSignalBridge(dut, [block], simulator_lib="/path/to/libxycecinterface.so")

All existing tests pass. Xyce integration testing requires Xyce installed.

v0.0.4

• Fix PEP 639 license classifier conflict that broke pip install
• Fix PLL example convergence (tanh VCO, charge pump guard)
• Add PyPI classifiers for Python version badges

v0.0.3

• Add PyPI classifiers for Python version badges
• Fix PLL example convergence (tanh VCO, charge pump guard)

v0.0.2

What's new

• CI pipeline: GitHub Actions with unit tests (Python 3.10-3.12), mypy, ruff, and integration tests
• Better error messages: Platform-specific install instructions when libngspice is not found, improved signal resolution errors, SPICE file/subcircuit validation
• Crossing detection logging: Debug-level logs with timestamps when analog outputs cross digital thresholds
• Thread safety docs: Documented GIL-based safety guarantees in MixedSignalBridge
• VCD robustness: try/finally ensures analog VCD is closed even on simulation errors
• Easier ngspice install: README now lists package manager commands (apt, dnf, brew, conda) before build-from-source
• Troubleshooting guide: Added sections for common issues (ngspice not found, signal not found, sawtooth output, simulation hangs)

v0.0.1

Initial release of cocotbext-ams.

ngspice bridge for cocotb — open-source mixed-signal co-simulation.

Features

• AnalogBlock / DigitalPin / MixedSignalBridge API for wiring digital RTL to SPICE subcircuits
• Automatic voltage-source bridging (digital→analog) and threshold-crossing detection (analog→digital)
• Analog VCD export ($var real) for viewing SPICE waveforms alongside digital signals
• Tutorial: SAR ADC with PWM DAC, RC filter, and sky130 latch comparator