My Projects
NMOS Design & Fabrication
Fabricated 8 NMOS wafers using photolithography processing, HF etching, and electron beam evaporation. Masks were patterned with a contact aligner, etch times were calibrated with microscopic analysis, and junction heights were measured with a Dektak profilometer. After finishing the samples with a metal liftoff, a 4-point probe was used to measure I-V characteristics, transconductance, and TLM for resistivity.
Monophonic Musical Synthesizer
Designed and implemented an analog monophonic musical synthesizer. Featured a VCO capable of generating square and triangle waveforms from 56-2.3k Hz, an ADSR envelope generator to shape the audio's amplitude, a VCA for dynamic signal control, and MOOG ladder LPF to provide harmonic filtering. Interfaced a MIDI keyboard controller with an Arduino to convert digital signals to DC control voltages.
Automated Garage Door System
Built a garage door system that is controlled by a half-stepping stepper motor. An accelerometer (interfaced with SPI) is used to determine the position of the door and it is opoened or closed with either terminal commands in UART or specified temperature conditions read from a TC-74 sensor using I2C. Bluetooth compatibility was also implemented with the HC-05 module.
Analog Circuit Design
Built a RMS converter for sinusoidal inputs with bandwidths between 50-100k Hz and amplitudes up to 4 Volts using only BJT ICs, op-amp ICs, and passive resistors/capacitors (no analog multipliers).
Built a single-stage differential amplifier for sinusoidal inputs up to 100k Hz and 20 mV amplitudes. The amplifier, which displayed functionality of 100 voltage gain, 6 Vpp output swing, and CMRR of 66 dB, was built with only MOSFET ICs, resistors, and capacitors.
Digital Tail Lights
Designed digital sequential tail lights using six LED's (3 per side) that mimic that of a Ford Mustang. Switches are mapped to states that allow lights to flash incrementally (left or right) to indicate turning or together to represent a hazard. LED's also brighten to represent an emergency and dim to represent braking, and logic was implemented to allow for combining these states. The hardware design was programmed in SystemVerilog, the testbench was simulated in Modelsim, and the code was mapped to an Intel FGPA using Quartus.
Adaptive Alarm Clock
Built an alarm clock that takes an audio input (via 3.5mm jack) and analyzes it to generate custom flashing LED's and buzzer noises. An enclosure was 3D printed using AutoFusion 360 which displayed a 7-segment timing display on the top face. The time is set by a potentiometer and the MSGEQ7 chip was used to evaluate the audio signal's input frequencies.
