开环增益

经过精心设计，该放大器在0.35μMCMOS工艺中带宽为590MHz，开环增益为90dB，功耗为15mW，满足高速A/D转换器要求的所有性能指标。

The elaborate design of the amplifier , results in the performances of 590 MHz bandwidth , open loop gain 90 dB and power consumption 15 mW for 0.35 μ m CMOS . All the performances of the amplifier satisfy the demands of high-speed A / D converter .

为了找出双稳态现象出现的原因，我们对于我们设计的环形双稳态激光器的开环增益做了测试，得到了增益曲线，并通过增益曲线解释了双稳态形成的机制。

In order to study the intrinsic mechanism of this bi-stability phenomenon , we measure the open loop gain of the laser .

运用一阶单时间常数低通函数模拟运算放大器的开环增益，对RC桥式振荡电路进行线性分析，得出最大振荡频率为运算放大器增益带宽积的16.67%。

The maximum frequency of RC-bridge oscillator is 16.67 % of gain bandwidth product of amplifier analyzed based on a first-order single time constant lowpass function model .

本文讨论了当前各种运放的电路结构，设计一种基于telescopic结构的增益推进式运算放大电路，该电路具有高的开环增益和带宽。

Discuss the kinds of the operational amplifier present and design a gain-boosted telescopic operational amplifier with high open gain and large bandwidth .

设计中采用了对寄生电容不敏感的反相积分器和同相积分器，积分器中的运算放大器选择具有较高直流开环增益和较大单位增益带宽的CMOS两级运放。

The in-phase integrator and reverse-phase integrator which are both not sensitive to parasitic capacitor are chosen in the filter design . The CMOS two-stage operational amplifier which has the high DC gain and unity gain bandwidth is used to form the integrator .

为在闭环条件下测得正常人的动脉压力感受器反射的开环增益（G），利用三个不同特点的血压调节模型，导出了G的计算表达式及G与血液动力学变量间的关系。

In order to estimate the open-loop gain ( G ) of arterial baroreceptor reflex in normal human , three models of arterial blood pressure regulation system with different features were developed , from which the equations for calculating G and the relationship between G and hemodynamic variables were derived .

被测信号的带宽、增益要求、放大器的开环增益以及稳定性都直接影响着电路各主要参数的选择。探测器的输出电容是FET输入型放大器和双极型放大器的主要选择依据。

The signal bandwidth required , signal gain required and the stability all influence the parameters of the impedance amplifier , specially the capacitor of APD determines the choice of FET input low noise amplifier or bipolar low noise amplifier .

测试结果表明，电路直流开环增益为125dB，共模抑制比120dB，失调电压18μV，压摆率0.6V/μs。

Results show that it has achieved an open-loop gain of 125 dB , a CMRR of 120 dB , an offset voltage of 18 μ V and a slew rate of 0.6 V / μ s.

用EDA软件Cadence进行模拟，得到了满意的仿真结果：直流开环增益为82.9dB，f-3dB为28kHz，相位裕度为46.9，低频下输出噪声频谱密度为1.5mV/Hz2。

Simulated by EDA software Cadence , the results obtained are satisfied . The DC open-loop gain is 82.9 dB with a 28 kHz 3 dB bandwidth and its phase margin is 46.9 . The maximum output noise spectral density is 1.5 mV / Hz2 at very low frequency .

电源工作电压1.8V~5.5V，静态工作电流仅为μA级，并具有80dB的开环增益、高电源电压抑制比和高共模抑制比等特点。

The static operating current is only several μ A at 1.8 V ~ 5.5 V supply voltage . The amplifier achieves an open-loop gain higher than 80 dB , and had high power supply rejection ratio ( PSRR ) and high common mode rejection ratio ( CMRR ) .

典型Ⅰ型系统开环增益的选择

The Choose of the Open-Loop Gain of the Typical I Model System

正常人动脉压力感受器反射开环增益的计算方法

A method to estimate the open-loop gain of arterial baroreceptor reflex in normal human subject

第三，轨到轨放大器输出级增益与负载有关，这将影响放大器的开环增益，当然也影响了闭环增益的准确性。

Third , rail-to-rail AMPLIFIER OUTPUT stages exhibit load-dependent gain which affects AMPLIFIER open-loop gain , and hence closed-loop gain accuracy .

直流开环增益各挡量程的校准以及共模抑制比各挡量程的校准。在介绍实用电路的同时，给出具体操作步骤，也给出了必要的计算过程和结果。

It introduces some practical circuits , at the same time indicates the operating steps , the necessary processes and the results of calculation .

该电路具有构思巧妙，结构优化，易于集成及较高的开环增益，共模抑制比及交流特性的优点。

The circuit has advantages with ingeniously conception , well structure , integrated easily , more open-loop gain , more common-mode rejection ratio and alternating current characteristic .

通过将电子膨胀阀与受控对象（蒸发器）细化分开来，并依据恒定开环增益准则从理论上分析了阀头补偿原理。

Through dividing electronic expansion valve from evaporator system and based on constant gain of superheat open loop rule , the compensation theory of valve head was analyzed .

此外，还利用导出的关系式分析了心率、外周阻力的调节变化对系统开环增益的相对贡献及输入压力水平对增益效果的影响。

In addition , the relative contributions of heart rate and peripheral resistance change to G and the effect of input pressure level on G were also analysed .

用所导出的公式，通过适当的实验设计，便可近似地分别计算出颈动脉窦和主动脉弓压力感受器反射的开环增益。

In terms of the equations derived , the open-loop gain of the carotid sinus and aortic baroreceptor reflexes can be estimated , respectively , through properly designed tests .

文中还强调平衡阀的节流口宜采用线性小增益形式，以利于降低系统开环增益，提高稳定性。

It is also stressed that the orifice of the valve adopting linear , small gain form is suitable to reduce open-loop gain of the system and increase the stability .

所提供方法可以从理论上识别系统的结构和驾驶员的参数，如开环增益，各个反馈系统和校正微分常数和前视时间等。

This method can from theory recognize parameters of both system structure and the driver , and every feedback systems as well as calibrated differential constant and front viewing time .

由于电路中存在各种非理想因素，如运算放大器的有限开环增益、比较器的输入偏置电压和电容的匹配误差等，流水线模数转换器的精度一般可以达到10位。

But due to many non-ideal effects such as finite open-loop gain of Op-Amp , decision-level drift and capacitor mismatches , the pipelined ADCs is generally limited to approximately 8-10 bits of resolution .

证明当运算放大器的开环增益足够高时，在适当地选取比例运算放大器的输入端电阻和反馈电阻的条件下，运算放大器开环输入电阻对闭环反相比例放大运算精度的影响是可以忽略的。

The error of close loop gain of inverse proportion amplifier , which is caused by the influence of open loop input resistance of operation amplifier can be negligible when the open loop is by the gain of the operation amplifier .

以双闭环直流调速系统为例，从开环增益、积分时间常数及对象参数变化三个方面，阐明系统产生振荡的原因，并进行仿真研究。

To take double closed-loop direct current timing system as example , the author states the reasons that cause system oscillation from aspects of amplifer multiple , proportional-integral time constant and object parameter , and all those have been studied by simulation .

变量泵源导致系统开环增益下降和动态变化，传统的反馈控制和串联校正很难使此类系统跟踪精度达到要求应用复合控制方法，可以对开环增益变化进行有效补偿，提高跟踪控制精度。

The variable pump makes the open loop gain change and decrease , the tracking control accuracy is difficult to be achieved by traditional feedback control A / O cascade control . Effective compensation to the change of open loop gain can be achieved with micro-controller and compound control methods .

设计了一种CMOS三级跨阻抗前置放大器，通过控制开环系统增益达到增加闭环系统稳定性的目的。

A three-stage trans-impedance amplifier designed in CMOS technology is presented , which stability can be promoted by varying the gain of open loop system .

仿真结果表明，该电路的开环直流增益为70dB，相位裕度达到86.6°，单位增益带宽为100MHz。

According to the simulation , the dc gain of open loop is 70 ? dB and unity gain-bandwidth product of 100 ? MHz with 86.6 ° of phase margin can be achieved .

运算放大器电源电压抑制比、开环电压增益和共模抑制比的关系

On the Relation Between Power Source Rejection Ratio , Open Loop Voltage Gain and Common Mode Rejection Ratio of an Operational Amplifier

实验结果表明该测试仪能准确测量运算放大器的输入失调电压、输入失调电流、交流差模开环电压增益和交流共模抑制比等参数。

Experimental results show that the device can precisely measure many parameters of IOA , such as input offset voltage , input offset current , open loop differential AC voltage gain and AC common mode rejection ratio .

对于适应反馈控制已研究了各种实用的开环方案（增益计划设定等）和闭环方案（模型参考，自校正，模式识别等）。

Practical open-loop ( gain scheduling ) and closed-loop ( model reference , self-tuning , pattern recognition ) schemes for adaptive feedback control have been developed to overcome problems caused by large variations in process or disturbance in dynamic characteristics .