FUBOCO Gallery

A curated collection of operational amplifier (op-amp) circuits generated by FUBOCO, organized to reflect their hierarchical design relationships.

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Repository Structure

All circuits live under the circuits/ directory:

circuits/
├── 1/
│   ├── netlist.cir
│   ├── stages.xml
│   └── subcircuits.xml
├── 1_1/
│   ├── netlist.cir
│   ├── stages.xml
│   └── subcircuits.xml
├── 1_2/
├── 1_2_1/
└── 1_2_2/

Each subdirectory contains three files:

File	Description
netlist.cir	SPICE netlist for the circuit
stages.xml	Stage-level topology description
subcircuits.xml	Subcircuit definitions

Naming Convention

Directory names encode the number of amplifier stages. The number of underscores (_) in the name equals the stage count minus one:

Directory	Stage Count
1	1-stage
1_1	2-stage
1_1_1	3-stage
1_2, 1_2_1, ...	2-stage, 3-stage variants

This tree structure captures the evolutionary lineage of each design — a child directory is always built on top of its parent — making it straightforward to trace how complexity grows across generations and to explore the latent design space.

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Circuit Categories

Circuits are grouped into four categories based on output type and stage count:

Category	Description
s-1-2	Single-output op-amps (1- and 2-stage)
s-3	Single-output op-amps (3-stage)
fd-1-2	Fully differential op-amps (1- and 2-stage)
fd-3	Fully differential op-amps (3-stage) ⚠️

Note: fd-3 is currently under development. Many functional_blocks.xml files contain errors (non-empty underParts). See docs/fd-3/functional_blocks_invalid for a list of op-amp IDs with invalid functional_blocks.xml. It is advised not to use fd-3 for any training tasks at this time.

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Dataset Statistics

Category	Circuit Count
s-1-2	1,950
s-3	3,604
fd-1-2	936
fd-3	32,832
Total	39,322

For a quick category-level overview of which subcircuit and functional block names present, refer to the .csv files in the stats/ directory.