Signal Processing Power Inverter Design

I’m developing a signal-processing module and need a purpose-built power inverter circuit to drive it reliably from a 12 V DC source. The job centres on circuit design; PCB work can follow later once the schematic is locked down... (Budget: $250 - $750 USD, Jobs: Circuit Design, Electrical Engineering, Electronics, PCB Design and Layout, PCB Layout, Signal Processing, Simulation, Thermal Analysis)