Embedded Files
Digital Potentiometer With 4 operating modes
Digital Potentiometer With 4 operating modes
Description: Designed and verified a mixed-signal integrated circuit in the ON 0.18 µm CMOS process that integrates four selectable operational modes onto a single chip: a programmable non-inverting amplifier, a programmable inverting amplifier, a digital potentiometer, and a 4-bit buffered string DAC.
My Role: Designed, implemented, and laid out the core analog processing and routing elements, including the 16-tap resistor ladder, the transmission gates for switching and node tapping, and the externally compensated operational amplifier.
Skills or Knowledge Gained: Deepened expertise in mixed-signal IC design, full-custom layout optimization for minimizing offset voltages, and rigorous physical verification workflows.
Resources Used: Cadence Virtuoso, Mentor Graphics Calibre (for DRC/LVS), and foundry-standard ON 0.18 µm PDK design rules.
ESP32-Smartwatch
ESP32-Smartwatch
Description: Engineered an ESP32-powered smart wearable device integrating wireless connectivity with an automated physical security mechanism to remotely control and actuate a servo-driven drawer locking system.
Your Role: Designed the power management subsystem using KiCad, including USB input power handling, battery charging circuitry, and DC-DC power conversion to deliver stable rails for the microcontroller and peripherals.
Skills or Knowledge Gained: Gained practical experience in lithium battery charging topologies, switch-mode power supply design, USB power delivery standards, and low-power wearable power distribution.
Resources Used: KiCad, ESP32 microcontroller, Li-ion/LiPo batteries, charge management ICs, and step-down DC-DC regulators.
Tempurature Indicator With Hardware Hysteresis
Tempurature Indicator With Hardware Hysteresis
Description: Designed and prototyped a multi-stage operational amplifier circuit utilizing dual Schmitt trigger configurations with LMC660 components to drive indicator LEDs (Green, Orange, and Red) based on precise voltage thresholds.
My Role: Performed theoretical design calculations and resistor ratio derivations, conducted transient simulations to verify threshold switching behavior, and assisted with physical circuit assembly and breadboarding.
Skills or Knowledge Gained: Mastered designing inverting and non-inverting Schmitt trigger circuits, configuring op-amps as comparators, calculating feedback network resistor ratios, and translating theoretical specifications into working hardware.
Resources Used: LTspice for circuit simulation, LMC660 operational amplifiers, standard resistors and diodes, a DC power supply, and breadboard prototyping equipment.
Pong-on-a-chip
Pong-on-a-chip
Description: Developed Pong-on-a-Chip, a standalone retro mini-game console powered by an ATtiny84 microcontroller that drives a compact 5x7 LED matrix, fitting entirely within a DIP-48 form factor.
My Role: Sole developer responsible for the complete end-to-end product realization, including writing the microcontroller firmware, capturing the schematic, and laying out the custom printed circuit board (PCB).
Skills or Knowledge Gained: Advanced embedded firmware optimization for resource-constrained microcontrollers, multiplexed LED matrix driving techniques, and compact, space-constrained PCB design.
Resources Used: ATtiny84 microcontroller, 5x7 LED matrix, PCB design software, and embedded development tools.
Page updated
Google Sites
Report abuse