Radio systems for professional audio. From the first circuit to production.
Logic Design Lab is Michelangelo Carrozzo’s independent laboratory. Since 2000, it has developed RF hardware, analog audio and FPGA logic for professional audio manufacturers.
Low- and high-power RF. Particular experience in 470–870 MHz wireless audio.
RF & analog
TX/RX hardware, PLLs and VCOs, switched output filters, wideband PCB antennas, low-noise audio and converter interfaces.
Digital radio
Original over-the-air protocols and FPGA receiver clock recovery. Embedded C drivers and low-level STM32 debug; detailed specifications for DSP firmware developers.
Also open to software-defined radio (SDR) projects combining RF hardware and FPGA-based signal processing.
Production
Test fixtures, GPIB automation, calibration and operator training. Direct production transfer in China, Germany and Italy.
Selected work
Systems I’ve designed.
Michelangelo Carrozzo
RF anechoic testing
Major professional audio manufacturer
Digital wireless microphones
System architecture, complete TX/RX hardware, wideband PCB antennas, audio circuits and the original radio protocol with FPGA clock recovery.
470–870 MHz · 126 dB audio dynamic range · AES encryption
RF & implementation notes
Receiver sensitivity of −97.4 dBm measured during development. The link was developed for crowded stages and interference-heavy RF conditions.
The original FPGA logic was designed in schematic capture, then migrated to VHDL under Michelangelo’s supervision. Specialist colleagues implemented DSP firmware, including the audio codec, from his protocol and hardware specifications.
dBTechnologies
DWS800 / RS16000 Touring Rack
400 MHz digital wireless platform. TX/RX hardware, radio protocol and FPGA clock recovery; production transfer in China. The later RS16000 added dedicated PC control and Ethernet configuration.
TG1000: digital wireless with 400 MHz tuning, an original radio protocol and FPGA clock recovery. TG500: analog wireless. Hardware design and production support in Germany and Italy.
RCF · 2005
Forum 2000
Digital conference hardware for up to 250 consoles, automatic console updates and encrypted UHF simultaneous interpretation. Hardware design and coordination of the software/firmware team.
Inside the lab
On the bench.
Debugging a Xilinx with an Altera MAX 10. An unusual pairing, but a useful one.
FSIQ7 vector signal analysis to 7 GHz, network analysis to 6 GHz, vector generators to 5.4 GHz and an Audio Precision System Two.
From 1995 to 2000, Michelangelo was Editorial Director and electronics designer at Nuova Elettronica: PLL radios, vector impedance meters, counters and valve amplifiers, built as kits and explained to readers.
He wrote the articles with Giuseppe Montuschi, who taught him how to make difficult electronics understandable.
Active member of the Audio Engineering Society.
Logic Design Lab · Bologna, Italy
Contact Michelangelo.
A complete system, an RF section or hardware ready for production.
