Compact and convenient healthcare systems made of CMOS IC are necessary for the low cost ubiquitous healthcare service. Healthcare systems, such as portable, wearable and implantable, are anatomized, and the signals, circuits and systems from the body to the LAN or other public networks are examined. The compact CMOS circuits for the sensor read-out, ADC, ultra low power platform, and wireless communication will be explained. The packaging technology, especially wearable forms, is important for user’s convenience. Fabric will be used extensively as the system integration substrate, and a new integration scheme that the CMOS ICs will be directly bonded on the fabric will be introduced. Bandage type ECG monitors, wirelessly powered and connected to the reader, will be explained as the system example.