共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
详细介绍电流转换为电压(1-V)的电路测量原理及减小误差的方法,并给出流压转换电路在电力系统测量中的具体应用电路图。 相似文献
3.
4.
采用SMIC 0.18 μm CMOS工艺,设计了一种应用于高速ADC的采样保持电路。运用大信号建模分析方法,针对采样保持电路中的缓冲器,引入一个PMOS管构成类Cascode结构,以消除二级效应对线性度的影响。同时,增加了一条低阈值NMOS管构成的电流通路来减小整个电路的寄生电容,进而提高缓冲器的线性度。仿真结果表明,该采样保持电路在1 GHz采样频率以内均可达到9位以上的有效位数。当采样频率为500 MHz时,该电路的SFDR为79.76 dB,ENOB为12.02 bit,THD为-85.33 dB,功耗约为26.8 mW。 相似文献
5.
6.
7.
8.
9.
本文针对电流基准功耗大、电源电压范围窄的问题,设计了一款同时具备低功耗、宽电压范围、低温度系数的CMOS基准电流源.基准电流由PTAT电流和CTAT电流按一定比例系数相加产生,表现出与温度无关的特性.使用基于CMOS亚阈值特性的运放和自级联电流镜,扩大了电源电压范围,降低了电路整体功耗,提升了电路性能.电路基于XFAB 0.35μm CMOS工艺进行设计,结果表明,基准电流为5μA,在-25℃~125℃温度范围内,温漂系数为40 ppm/℃,电源电压为2.5 V~6 V,功耗为25μA. 相似文献
10.
基于BiCMOS技术设计的CS/VR电路 总被引:21,自引:5,他引:21
成立 《固体电子学研究与进展》1998,18(4):373-378
运用双极互补金属氧化物半导体(BiCMOS)的先进技术,设计了几个实用的电流源/基准电压源(CS/VR)电路,并籍助于通用电路模拟软件PSpice3.00,对它们进行了仿真研究。 相似文献
11.
Roger Yubtzuan Chen Seng-Fong Lin Ming-Shian Wu 《Circuits, Systems, and Signal Processing》2006,25(4):497-509
An improved complementary metal oxide semiconductor (CMOS) voltage-to-current converter is presented. PMOS transistors are
employed in the resistor-replacement and voltage-level shifting of the proposed converter to avoid the body effect. To accurately
annihilate the nonlinear voltage terms, a better modeling of the drain-to-source current of the MOS transistor operating
in the linear region is essential and is adopted. Specifically, the substrate-bias effect of the MOS transistor is treated
more accurately in our design. Consequently, the nonlinearity of the large-signal transconductance of the converter is reduced.
The voltage-to-current converter is designed and fabricated in a 0.35 μm CMOS technology. The fabricated circuit occupies
an area of 267 μm × 197 μm (≈0.053 mm2) and dissipates 3.92 mW from a 3.3 V supply. The measured and simulated data are in good agreement. For a 1 VP-P input voltage, the measured total harmonic distortion (THD) of the output current is less than 1.2%. 相似文献
12.
13.
设计了一种适于DVB-C标准的中频可变增益放大器。该放大器由三部分构成:电流调节型可变增益单元、基于差分对管传输特性的指数控制电压产生电路以及一高线性输出级。采用Chartered0.25μm RFCMOS工艺库下流片。测试结果表明,4~49dB的连续增益范围,100MHz的3dB带宽,50Ω负载下的OIP3为16.8dBm。 相似文献
14.
15.
Chung-Chih Hung Changku Hwang Mohammed Ismail Kari Halonen Veikko Porra 《Analog Integrated Circuits and Signal Processing》1997,13(3):261-274
This paper presents two CMOS low-voltage rail-to-rail voltage-to-current converters (V-I converter) which could be used as basic building blocks to construct low-voltage current-mode analog VLSI circuits. In each of the circuits, an N-type V-I converter cell is connected in parallel with its P-type counterpart to achieve common-mode rail-to-rail operation. A linear differential relationship of the N-type V-I converter, or its P-type complement, is obtained using a new class-AB linearization technique. In the first rail-to-rail V-I converter circuit, a constant transconductance is achieved through the use of two maximum-current selecting circuits and an output subtraction stage. In the second circuit, a constant transconductance value is obtained by manipulating the DC bias currents of N- and P-type V-I converter cells. Both of the circuits can operate from rail to rail with a power supply of 3V, or less depending on the VLSI technology and the DC bias current level. 相似文献
16.
本文设计了一种可满足视频速度应用的低电压低功耗10位流水线结构的CMOS A/D转换器.该转换器由9个低功耗运算放大器和19个比较器组成,采用1.5位/级共9级流水线结构,级间增益为2并带有数字校正逻辑.为了提高其抗噪声能力及降低二阶谐波失真,该A/D转换器采用了全差分结构.全芯片模拟结果表明,在3V工作电压下,以20MHz的速度对2MHz的输入信号进行采样时,其信噪失调比达到53dB,功率消耗为28.7mW.最后,基于0.6μm CMOS工艺得到该A/D转换器核的芯片面积为1.55mm2. 相似文献
17.
18.
19.
Jincheol Yoo Kyusun Choi Daegyu Lee 《Analog Integrated Circuits and Signal Processing》2003,35(2-3):179-187
This paper presents a comparator generation and selection method to reduce the linearity errors—DNL and INL—for a CMOS flash analog-to-digital converter (ADC) based on threshold inverter quantization (TIQ) technique. The TIQ flash ADC requires 2
n
– 1 comparators like conventional flash ADCs. However, each comparator in the TIQ flash ADC has different sizes to provide internal reference voltages, while the differential comparators have identical sizes. The design method has been incorporated into a software package and the 2
n
– 1 optimized TIQ comparator layouts are generated as an output of the software package. The linearity errors against the CMOS process, power supply voltage, and temperature variations are significantly improved by the proposed comparator generation and selection method for the TIQ flash ADC. Especially, the DNL dependence on the CMOS process variation can be almost eliminated. The simulation results show 82.6% of DNL and 32.5% of INL improvements against CMOS process variation. For the other variations—power supply voltage and temperature—43.5% for DNL and 6.0% for INL improvement has been achieved. The prototype chips have been fabricated and the chip test results confirms the simulation results. 相似文献