A Stacked-packaged 16-channel ADC for Ultrasound Application

This paper presents a 16-channel 50MS/s 14bit ADC designed for ultrasound application, composing of two sub-chips with each 8 channels. These two sub-chips are stacked-packaged in a single chip. In order to form the sub-chip with 8 single-channel ADCs without performance decrease, the power and clock distribution tree is carefully designed. And isolation is also applied between each channel. Stacked-package technology is used to combine two sub-chips together and the layout of pins is specially optimized The design is fabricated in SMIC IP6M 0.18 mu m CMOS technology. The measurement result shows that all 16 channels work properly, achieving an average ENOB of 10.7bits, an average SNDR of 64.53dB, an average SFDR of 71.56dB, and the power consumption is 90mW/channel under 3.5MHz input.