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A Wire-overhead-free Reset Propagation Scheme for Millimeter-scale Sensor Systems
Inhee Lee,Suyoung Bang,Yejoong Kim,Gyouho Kim,Dennis Sylvester,David Blaauw,Yoonmyung Lee 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.4
This paper presents a novel reset scheme for mm-scale sensing systems with stringent volume and area constraints. In such systems, multi-layer structure is required to maximize the silicon area per volume and minimize the system size. The multi-layer structure requires wirebonding connections for power delivery and communication among layers, but the area overhead for wirebonding pads can be significant. The proposed reset scheme exploits already existing power wires and thus does not require additional wires for system-wide reset operation. To implement the proposed reset scheme, a power management unit is designed to impose reset condition, and a reset detector is designed to interpret the reset condition indicated by the power wires. The reset detector uses a coupling capacitor for the initial power-up and a feedback path to hold the developed supply voltage. The prototype reset detector is fabricated in a 180-μm CMOS process, and the measurement results with the prototype mm-scale system confirmed robust reset operation over a wide range of temperatures and voltages.
A Wire-overhead-free Reset Propagation Scheme for Millimeter-scale Sensor Systems
Lee, Inhee,Bang, Suyoung,Kim, Yejoong,Kim, Gyouho,Sylvester, Dennis,Blaauw, David,Lee, Yoonmyung The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.4
This paper presents a novel reset scheme for mm-scale sensing systems with stringent volume and area constraints. In such systems, multi-layer structure is required to maximize the silicon area per volume and minimize the system size. The multi-layer structure requires wirebonding connections for power delivery and communication among layers, but the area overhead for wirebonding pads can be significant. The proposed reset scheme exploits already existing power wires and thus does not require additional wires for system-wide reset operation. To implement the proposed reset scheme, a power management unit is designed to impose reset condition, and a reset detector is designed to interpret the reset condition indicated by the power wires. The reset detector uses a coupling capacitor for the initial power-up and a feedback path to hold the developed supply voltage. The prototype reset detector is fabricated in a $180-{\mu}m$ CMOS process, and the measurement results with the prototype mm-scale system confirmed robust reset operation over a wide range of temperatures and voltages.
Shim, Minseob,Jeong, Seokhyeon,Myers, Paul D.,Bang, Suyoung,Shen, Junhua,Kim, Chulwoo,Sylvester, Dennis,Blaauw, David,Jung, Wanyeong IEEE 2017 IEEE journal of solid-state circuits Vol.52 No.4
<P>This paper presents a new energy-efficient ring oscillator collapse-based comparator, named edge-pursuit comparator (EPC). This comparator automatically adjusts the performance by changing the comparison energy according to its input difference without any control, eliminating unnecessary energy spent on coarse comparisons. Furthermore, a detailed analysis of the EPC in the phase domain shows improved energy efficiency over conventional comparators even without energy scaling, and wider resolution tuning capability with small load capacitance and area. The EPC is used in a successive-approximation-register analog-to-digital converter (SAR ADC) design, which supplements a 10 b differential coarse capacitive digital-to-analog converter (CDAC) with a 5 b common-mode CDAC. This offers an additional 5 b of resolution with common mode to differential gain tuning that improves linearity by reducing the effect of switch parasitic capacitance. A test chip fabricated in 40 nm CMOS shows 74.12 dB signal-to-noise and distortion ratio and 173.4 dB Schreier Figure-of-Merit. With the full ADC consuming 1.17 mu W, the comparator consumes 104 nW, which is only 8.9% of the full ADC power, proving the comparator's energy efficiency.</P>