Based on a low supply voltage curvature-compensated bandgap reference and central symmetry Q;random walk NMOS currentsource layout routing method,a 1.2-V 10-bit 100-MSPS CMOS current-steering digital-to-analog conver...
详细信息
Based on a low supply voltage curvature-compensated bandgap reference and central symmetry Q;random walk NMOS currentsource layout routing method,a 1.2-V 10-bit 100-MSPS CMOS current-steering digital-to-analog converter is implemented in a SMIC 0.13-μm CMOS *** total consumption is only 10 mW from a single 1.2-V power supply,and the integral and differential nonlinearity are measured to be less than 1 LSB and 0.5 LSB, *** the output signal frequency is 1-5 MHz at 100-MSPS sampling rate,the SFDR is measured to be 70 *** die area is about 0.2 mm;.
In this paper, an on-chip low-power current sensor with auto-accuracy adjustment is proposed for current monitor applications, which is composed by a sensing element and a quantizer. The sensing element is designed as...
详细信息
ISBN:
(纸本)9781538665510
In this paper, an on-chip low-power current sensor with auto-accuracy adjustment is proposed for current monitor applications, which is composed by a sensing element and a quantizer. The sensing element is designed as a current mirror with auto-adjustable current ratio of K determined by the value of sensing current. When the current is larger than a threshold value, K changes from 1000 to 2000 to reduce the power consumption. The quantizer includes a comparator, two current source arrays and two successive approximation register (SAR) logic circuits. The main 8-bit SAR logic is adopted to control a current-sourcearray to realize current quantized range, the auxiliary 4-bit SAR logic is employed to control another current source array to achieve auto-adjustable quantized precision, and the comparator is used as a feedback loop to guarantee the quantized process. The current sensor is fabricated with a standard 0.18 mu m CMOS process with active area of 0.069 mm(2). Simulation results show that the quantized error is less than 0.8% across the current range of 1mA-100mA at 1 V supply voltage. The maximum power consumption is only 43 mu W at 100 mA load current. The excellent performance shows its good practicality for current monitor applications.
暂无评论