The first topic of this thesis is a cell-based design solution of 4¡Ñ8 scanning decoder using RC5 protocol for DECT handsets. It is a keypad scanner ASIC without any embedded microprocessor nor internal ROMs. The keypad scanner uses RC5 transfer protocol which is compatible with remote control and wireless handsets. The keypad scanner built in the handsets must meet the requirement of low power consumption and small die size to avoid shortening the battery lift and increasing chip cost. The proposed ASIC design possesses both of the required advantages. The second topic is a high-performance SRAM using current sense amplifier. Current sensing in SRAMs is very promising method to achieve high speed operations in low-voltage applications. This topic present a current sense amplifier circuit as well as its simulation results.