FOSSEE Summer Fellowship 2026 Shouvik Paul - #593
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…2026 Last README update: 2026-06-09 (commit d3eec61) This update: 2026-07-27 Branch: docs (tracking origin/docs-readme-updates) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SUMMARY OF REPO CHANGES DOCUMENTED IN THIS README UPDATE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Total commits since last README: ~150 commits (2026-06-10 to 2026-07-27) Files changed (repo-wide): 2800+ files across 20+ PRs SubcircuitLibrary total: 741+ verified IC subcircuits (was ~630) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1. IHP PDK INTEGRATION ENHANCEMENTS (2026-06-28) Commits: cbd0d91, 87aa826, 885ddc7, 1d0f266 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ New files in ihp/: + ihp/install-ngspice-latest.sh Script to build latest ngspice from source with OSDI support. Requires eSim/NGHDL pre-installed. Backs up existing ngspice35, then builds with --enable-predictor --enable-osdi from SourceForge. + ihp/.spiceinit Pre-configured Ngspice initialization file for IHP-Open-PDK. Now correctly placed in user home directory (not project root) after running the IHP configuration step. + ihp/example.cir NMOS DC test circuit demonstrating a real IHP SG13G2 PDK SPICE simulation workflow from scratch. Modified: ~ ihp/ihp-install-script.sh Updated to move .spiceinit to C:\Users\rikik during configuration instead of leaving it in the repo working directory. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 2. SUBCIRCUIT LIBRARY EXPANSION (2026-06-10 to 2026-07-27) PRs: FOSSEE#569, FOSSEE#574, FOSSEE#593, FOSSEE#594, FOSSEE#595, FOSSEE#596, FOSSEE#604, FOSSEE#605, FOSSEE#606, FOSSEE#609, FOSSEE#610 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 110+ new subcircuits added to library/SubcircuitLibrary/. Each subcircuit includes: .sub (SPICE), .kicad_sch, .cir test circuit. CA-Series ICs (commit: ec9b77f, 78c2411–70af4f61): + CA3005 — Differential amplifier array + CA3018 — General-purpose transistor array + CA3019 — Diode / transistor array + CA3022 — RF/IF amplifier + CA3028A — RF/IF differential amplifier + CA3036 — NPN transistor array + CA3054 — Dual differential amplifier MC-Series Analog ICs (commits: 84bcd9f–5869f6aa, 2026-07-11): + MC1306_Sub — Audio power amplifier IC + MC1510_sub — Wideband video/RF amplifier IC + MC1545_Sub — Wideband video amplifier IC + MC1550_Sub — RF/IF amplifier IC + MC1554_Sub — Audio power amplifier IC + MC1569_Sub — Positive voltage regulator IC + MC1595_Sub — Four-quadrant multiplier IC + MC1596_Sub — Balanced modulator/demodulator IC Analog / Mixed-Signal ICs — PR FOSSEE#604 (commits: 0e7618c–fd9d77ea, 2026-07-17): + LT1010 — Power buffer amplifier + vca821 — Variable gain amplifier (10 MHz, -40dB to +40dB) + ths4541 — Fully differential amplifier + ths4303 — High-speed current-feedback op-amp + opa656 — Wideband unity-gain stable FET-input op-amp + lmh6702 — Ultra-low distortion wideband op-amp + cppll — Charge-pump PLL + ad834 — 500 MHz four-quadrant multiplier + ad8307 — Low-power logarithmic amplifier (500 MHz) + 3bit_flash_adc — 3-bit flash analog-to-digital converter Power Management / Motor Driver ICs (commits: 4641b86–eff8bec2, 2026-07-13): + IR2130 — Gate driver (3-phase bridge) + IR2110 — High- and low-side gate driver + IP5328P — Power bank management IC + LM1815 — Adaptive peak detector + L298N — Dual full-bridge motor driver + LP2950 — Micro-power voltage regulator + MCP73831 — Single-cell Li-Ion / Li-Po charge controller + TL494 — Pulse-width-modulation control circuit + TP4056 — Li-Ion battery charger IC + _TL783 — Adjustable high-voltage regulator (125V) Voltage Regulators (commits: 0ae0a7f–41c3cc89, 2026-07-14): + LM2917 — Frequency-to-voltage converter / tachometer + LM2941 — Low-dropout regulator (1A, adjustable) + LM7806 — Fixed 6V positive voltage regulator + LP2951 — Micro-power adjustable voltage regulator + MCP1700 — Ultra-low quiescent current LDO regulator + TCA965 — Precision window discriminator Op-Amps & Comparators (commits: 9d810b4–3d0584ed, 2026-07-13): + LM2902 — Quad op-amp (wide voltage range, low power) + LM2904 — Dual op-amp (wide voltage range, low supply) SN74-Series Digital ICs — PR FOSSEE#593 (commits: 225fb80–ea2d0acb, 2026-07-09): + SN74AS303 — 8-input NAND gate + SN74AS304 — 8-input NOR gate + SN74AS305 — 8-input NOR gate with open-collector + SN74LS247 — BCD-to-seven-segment decoder/driver + SN74LS295B — 4-bit right-shift register + SN74LS353 — Dual 4-input multiplexer (3-state) + SN74LS451 — Dual 4-line-to-16-line decoder + SN74LS461 — Octal counter + SN74LS498 — 8-bit shift register + SN74S268 — Dual 4-bit latch + SN74S532 — Magnitude comparator + SN74S536 — Dual J-K flip-flop + SN74278 — 4-bit cascadable priority register CD/CMOS Series (commits: 87fd998–6bf9c228, 2026-07-12): + CD4016 — Quad bilateral switch + CD4026B — Decade counter/divider with 7-segment display + CD4029B — Presettable binary/decade up/down counter + CD4089B — Binary rate multiplier + CD4099B — 8-bit addressable latch TTL/CMOS Logic — PR FOSSEE#594 (commits: 6d94315–7afbc57a, 2026-07-13): + 74HCT594 — 8-bit serial-in, serial/parallel-out shift register + 74LS112 — Dual JK negative-edge-triggered FF with preset & clear + 74LS150 — 16-to-1 data selector/multiplexer + 74LS298 — Quad 2-input multiplexer with storage + 74LS379 — Quad D flip-flop with complementary outputs + 74LS399 — Quad 2-port register + 74hc589 — 8-bit parallel-in/serial-out shift register + CD4095BMS — CMOS gated J-K master-slave flip-flop Additional Digital ICs (commits: 2026-07-10–2026-07-12): + SN54170 — 4x4 register file (open-collector) + MM74C923 — 20-key encoder + LM3914 — Dot/bar display driver + 74ls93 — 4-bit binary ripple counter + 74ls175 — Quad D flip-flop + 74ls181 — 4-bit arithmetic logic unit + 74ls374 — Octal D flip-flop (3-state) + 74ls670 — 4x4 register file (3-state) + 74lv157 — Quad 2-input multiplexer + DM74ls173 — 4-bit D-type register + sn74ls244 — Octal buffer/line driver (3-state) + sn5470 — Dual 4-input expandable NAND gate + 4024bc — 7-stage binary ripple counter Further ICs from PR FOSSEE#574 & others (commits: 6cc764d–277e618d, 2026-06-13): + SNx4HC03 — Quad 2-input NAND gate (open-drain) + SNx5452B — AND-OR-INVERT gate + SN74LS156 — Dual 2-to-4 decoder/demultiplexer + SN74HC623 — Voltage-controlled oscillator + LM760 — Operational amplifier + CD74HCT241 — Octal buffer and line driver + CD74HC563 — Octal D-type transparent latch + CD4585 — 4-bit magnitude comparator + CD4073B — Triple 3-input AND gate ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3. LIBRARY REORGANIZATION / CLEANUP (2026-07-08 & 2026-06-26) PRs: FOSSEE#591 Commits: 1e086d2, 54d711d, 2911491 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Moved misplaced subcircuits from a duplicate/incorrect path into the canonical library/SubcircuitLibrary/ directory: + CA3020 — Wideband power amplifier + LM108 — Precision op-amp + LM3080 — Programmable op-amp + MC1496 — Balanced modulator/demodulator + NE556 — Dual 555 timer + TL03xA — Low-power op-amp (TI TL03x family) + UA702M — Operational amplifier Also: subcircuit files from SUBCKT/ moved to library/SubcircuitLibrary/ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 4. NGHDL — MICROWATT CO-SIMULATION EXAMPLE (2026-06-11) PR: FOSSEE#569 | Commit: 6773fe1 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ + nghdl/Example/microwatt/ Full Microwatt NGHDL co-simulation example demonstrating mixed-signal simulation with the open-source Microwatt POWER ISA soft-core processor interfaced with Ngspice via GHDL. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 5. DOCKER BUILD FIX (2026-06-26) Commit: d418b30 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ + docker-launcher/Dockerfile Added 'libreadline-dev' to the apt-get install list. Fixes a build failure on newer Ubuntu base images where readline is no longer included by default. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 6. BUG FIX — WORKSPACE NEWLINE HANDLING (2026-06-14) PR: FOSSEE#469 | Commit: 323e7b7 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ + src/projManagement/newProject.py (or equivalent) Fixed trailing newline/whitespace issue in workspace path handling that could cause path resolution failures on certain Linux configurations. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ README CHANGES IN THIS COMMIT (102 insertions, 6 deletions) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ UPDATED sections: ~ Features table: Subcircuits row now shows '741+ ICs in SubcircuitLibrary' ~ Tech Stack table: Added IHP SG13G2 badge alongside SKY130 PDK ~ ihp/ directory description: Expanded to list all 4 files with purpose ~ SubcircuitLibrary description: Updated count to '741+' with section link ~ NGHDL Example/: Noted Microwatt co-simulation example NEW sections added: + '### IHP PDK Integration (ihp/)' table in Project Structure + '## 📦 Subcircuit Library' section with categorized IC families Categories: Logic Gates, Flip-Flops, Shift Registers, MUX/DEMUX, Counters, Encoders, Op-Amps, Regulators, Audio Amps, RF/IF Amps, Multipliers, Motor Drivers, CA-series, SN74-series, MC-series, CD/CMOS, ADC/DAC, Timers, and Miscellaneous + '## 📝 Recent Changes' section documenting all 6 change categories with dates, PR numbers, commit hashes, and per-item descriptions + '## 📄 License' section (was missing from footer area) + Docker install note about libreadline-dev fix + IHP install-ngspice-latest.sh usage snippet in Installation section Refs: FOSSEE#469 FOSSEE#569 FOSSEE#574 FOSSEE#591 FOSSEE#593 FOSSEE#594 FOSSEE#595 FOSSEE#596 FOSSEE#604 FOSSEE#605 FOSSEE#606 FOSSEE#609 FOSSEE#610
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Related Issues
The designed Integrated Circuits are very popular and these are used in our everyday life. These all are the backbone of electronics application.
Purpose
The main motive is to make easier of implementation complex ICs with these basic ICs in eSim.
The list of ICs present in this pull request are as follows:
Approach
For designing the IC in eSim first we need to make schematic of the IC. Then annotate the components in the schematic. After that make a symbol of the respective IC. Create a netlist of that file. After that convert KiCad to NgSpice with giving the component values. Now we are ready to check the input, output plots for analysis of the IC.