At present, permanent day main supply product: Such as three base lines constant voltages IC, low pressure drop constant voltage IC, the DC-DC direct current transformation controls IC, the operation and comparison amplifier IC, a PWM kind of power source manages IC, datum reference constant voltage IC, the lithium battery protection circuit, the audio frequency actuates IC, Kara OK reverberation IC, the volume control and adjusts IC, the LCD/LED/VFD demonstration actuation, the photoelectricity pale pinkish purple, semiconductor device aspect and so on high voltage Xiao Teji, high-pressured MOS obtains is in the lead the manufacture technology.
目前，恒天主要供应产品：诸如三端线性稳压IC、低压降稳压IC、DC-DC直流转换控制IC、运算与比较放大器IC、PWM类电源管理IC、基准参考稳压IC、锂电池保护电路、音频驱动IC，卡拉OK混响IC、音量控制和调节IC、LCD/LED/VFD显示驱动、光电藕合器、高电压肖特基、高压MOS等半导体器件方面取得领先制造技术。
Additional features include a low dropout bias regulator, error amplifier, precision reference, adaptive dead time control of the gate signals and thermal shutdown.
其他功能还包括一个低压差稳压器偏置稳压器，误差放大器，高精度的参考，自适应的门信号和热关断时间控制死。
According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.
根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。
In heterodyne detection control system, the detector detects the interferential signal of each amplifier and the modulated reference beam to fulfill the phase noise measurements of ytterbium fibre amplifiers.
通过自动寻优的方式不断改变相位调制器的控制电压，使系统输出保持在干涉最强处，爬山法系统的控制精度为λ/10。
It composed pure resistance, that is FET transistor、operation amplifier、transistor and full-wave bridge; since impedance is a pure resistance no harmonic frequency by changing direct control voltage; the feed-back loop having best steady reference DC voltage, the differential amplifier is quite plus, the circuit is essentially linearly, the equipment having lofty stabilization precision.
形成这只阻抗器的电路由场效应管、运算放大器、晶体管和整流桥组成；这只阻抗器的等效电阻是纯电阻，所以在调整电压的过程中不会产生谐波，也就是不会产生正弦波失真；反馈控制网络有极稳定的基准电压，比较器是增益很高的运算放大器，电路有非常好的转换线性，因此该装置有很高的稳压精度。
System based on the different output of the power detector control two ADC output different voltages, to dynamically control the power amplifier supply voltage and bias reference voltage.
系统依据功率检测器检测到输出功率的不同，控制两个模数转换器输出不同的电压，来动态地控制功放的供电电压和偏置参考电压。
Such as: band gap reference voltage, the bias circuit, error amplifier, oscillator, PWM comparator, over thermal protection, under voltage protection, logic control part.
其中包括：带隙基准源、偏置电路、误差放大器、振荡器、PWM比较器、过温和欠压保护电路、逻辑控制等部分。
The measurement circuit combines the systemic scaling method and analog orthogonal locked-in amplifier. The excitation signal is transformed into direct voltage, which provides the reference voltage of analog-to-digital converter and the denominator control voltage of multiplier. The errors caused by amplitude fluctuation are minimized.
测量电路将系统比例测量法与正交锁相放大技术相结合，把激励信号变换为直流电压提供ADC的基准电压及乘法器的分母控制电压，减小激励信号幅值波动在系统测量结果中引入的误差。
Then each module of the chip is analyzed and designed, in which several important modules including the regulator circuit, the reference circuit, error amplifier, oscillator, current control module, PWM comparator, dead-time control circuit, slope compensation and protection circuit.
然后对芯片的各个模块进行了分析和设计，其中几个重要的模块包括稳压电路，基准电路，误差放大器，振荡器，电流采样模块，比较器、死区时间控制电路、斜坡补偿和保护电路等。