Using sige bicmos darlington configuration as the input stage , the input resistance is increased by the mos devices while the transconductance of sige hbts is maintained . in the same time , the equivalent input noise is controlled well because of the sige hbts ’ good noise performance in the input stage 输入级的设计采用sigebicmos达林顿结构,在保留sigehbt高跨导优势的基础上充分利用mos器件来提升运放输入电阻,此外,基于输入级中sigehbt良好的噪声特性,运放的输入参考噪声电压可以大大降低。
In the meanwhile , according to the quite different demands which the overall performance of the ota imposes on its input and output cells , utilizing characteristics of switched - capacitor and common - mode feedback circuit , continuous common - mode feedback method and switched - capacitor method have been applied to the input and output cells , respectively 同时,根据ota整体指标对输入级和输出级单元不同的性能要求,并结合连续型共模反馈电路与开关电容型共模反馈电路的各自特点,将连续型共模反馈和开关电容共模反馈技术分别应用于运放输入级和输出级单元。
The thesis has done the widespread investigation and study to the domestic and foreign ’ s technologies of analogy low voltage and low power , and analyzes the principles of work , merts and shortcomings of these technologies , based on the absorption of these technologies , it designs a 1 . 5v low power rail - to - rail cmos operational amplifier . when designing input stage , in order to enable the input common mode voltage range to achieve rail - to - rail , it does not use the traditional differential input pair , but use the nmos tube and the pmos tube parallel supplementary differential input pair to the structure , and uses the proportional current mirror technology to realize the constant transconductance of input stage . in the middle gain stage design , the current mirror load does not use the traditional standard cascode structure , but uses the low voltage , wide - swing casecode structure which is suitable to work in low voltage . when designing output stage , in order to enhance the efficiency , it uses the push - pull common source stage amplifier as the output stage , the output voltage swing basically reached rail - to - rail . the thesis changes the design of the traditional normal source based on the operational amplifier , uses the differential amplifier with current mirror load to design a normal current source . the normal current source provides the stable bias current and the bias voltage to the operational amplifier , so the stability of operational amplifier is guaranteed . the thesis uses the miller compensate technology with a adjusting zero resistance to compensate the operational amplifier 本论文对国内外的模拟低电压低功耗技术做了广泛的调查研究,分析了这些技术的工作原理和优缺点,在吸收这些技术成果基础上设计了一个1 . 5v低功耗轨至轨cmos运算放大器。在设计输入级时,为了使输入共模电压范围达到轨至轨,不是采用传统的差动输入结构,而是采用了nmos管和pmos管并联的互补差动输入对结构,并采用成比例的电流镜技术实现了输入级跨导的恒定;在中间增益级设计中,电流镜负载并不是采用传统的标准共源共栅结构,而是采用了适合在低压工作的低压宽摆幅共源共栅结构;在输出级设计时,为了提高效率,采用了推挽共源级放大器作为输出级,输出电压摆幅基本上达到了轨至轨;本论文改变传统基准源基于运放的设计,采用了带电流镜负载的差分放大器设计了一个基准电流源,给运放提供稳定的偏置电流和偏置电压,保证了运放的稳定性;并采用了带调零电阻的密勒补偿技术对运放进行频率补偿。
The chip is accomplished in the full cooperation with other team members , the author pays particular attention to the analysis of the whole chip architecture and three sub - block design : transconductance amplifier ( ota ) , voltage reference and current reference . based on existed technologies , a new high order temperature compensated voltage reference and a creative current reference with high order temperature compensation are shown respectively . the author simulated all the sub - block and whole chip by hspice 该芯片的设计是由小组成员共同完成,本人主要负责了总体电路的分析、联合仿真验证及以下三个子电路的设计: 1 、跨导放大器,详细分析了bandgap跨导放大器输入级的动静态特性及其优缺点,并结合系统要求,设计了一种与cmos工艺相兼容、可替代bandgap跨导放大器的低压共源共栅跨导放大器。
The other is the design of amplifier with constant trans - conductance ( gm ) rail - to - rail input stage . when common mode input voltage changes , it provides nearly constant - gm independent of input transistor operating region ( strong , moderate or weak inversion ) , and the quiet nods of the circuit for current addition and the output stage keep unchanged 当输入共模电压变化时,不管它的输入mos差分对管处于强反型区还是弱反型区,输入级的跨度保持不变,而且输入级后面的电流加法电路和输出级的静态工作点也不会随之改变。
A complementary input stage , which consists of a p - channel pair and a n - channel pair , was used in the circuit , so that the common mode input range can extend from rail to rail . a dcls is used to shift the n - transistor curve leftward to overlap the p - transistor curve properly and keep constant transconductance in the whole common mode input range 输入级采用pmos差分输入对和nmos输入差分对并联的结构，从而实现共模输入范围扩大到电源的正负两端，并且通过两个源级跟随器平移nmos输入管跨导曲线，使nmos输入管和pmos输入管跨导曲线的适当交叠，从而保持了这个输入级的跨导在整个共模输入范围内保持恒定。
Also discussed the methods on how to realize the cwt both in time - domain and frequency - domain and how to design the gm - c bandpass filter used in realization of cwt . in order to optimize the performance of gm - c filter , linearization techniques are investigated and proposed . due to process variation and parasitics , an automatic tuning is designed for center frequency / 0 and quality factor q also , in this thesis , 16 - channel analogue cmos cwt circuit has been realized 论文围绕连续小波变换的模拟电路实现这一热点问题，讨论了连续小波变换的时域和频域实现方法；具体分析了并行结构与串行结构的优缺点；研究了频域法中的跨导-电容带通滤波器的设计；给出了改善跨导输入级传输特性的线性程度并扩大线性范围的具体方法；设计了片内自校正(可调谐)环节使滤波器参数自动调整到设计标准值；最后给出了16通道滤波器组实现小波变换的方法。
In the chapter 4 , the basic concept and characteristics about the current model circuit and transconductor ( gm ) are given . in order to optimize the performance of gmce , four linearization techniques and the design of consequently successful circuits are investigated and proposed . at last , the four linearization techniques are summarizes 第四章讨论了电流模式电路及跨导器的基本概念及性能特点，重点研究并给出了改善输入级传输特性的线性程度并扩大线性范围的四种方法，介绍在这方面比较成功的一些电路设计，总结了这四种方法的异同点。
