A 12-bit serial-to-parallel converter using depletion-mode-only devices

Multi-function monolithic microwave integrated circuits (MMIC) such as those used in phased array radar systems are typically implemented using processes that incorporate both enhancement and depletion-mode FETs. Although the combination of the two FET types is ideal for integrating digital content on MMICs, these processes have frequency and power density limitation. If an integrated solution could be achieved for depletion-mode only processes, circuits could be realized in the higher frequency bands. In this paper, we present a 12-Bit Serial-to-Parallel Converter using Depletion-Mode only Devices in a 0.5μm pHEMT Technology. Power saving techniques such as such voltage level shifting, power down circuitry, and the use of high value resistors are implemented to reduce power consumption.