Design of 4-bit Flash ADC Cell for UWB Sensor Systems

This article describes a design of 4-bit Flash analogue-digital converter (ADC) for Ultra-Wideband (UWB) sensor systems. The ADC cell structure was designed and fabricated in 0.35 μm SiGe BiCMOS technology. Proposed ADC cell achieves up to 1.1 Gs/s with maximum input signal range 1.6 V_pp at 1 MHz. The power consumption of the designed cell is 30 mA from -3.3 V power supply. For basic measurement, the ADC has been directly wires bonded to PCB. The basic measurements are represented by time domain and input-output ADC characteristics. The ADC was primarily designed as a test structure for M-sequence UWB SoC radar.