AOS电压调整器的瞬态电压中高速双路具有低频电压放大
2018-04-18 11:00:07
返回列表

(泰德兰报道:)

Low frequency voltage amplification circuit diagram

低频电压放大电路图

The low frequency voltage amplifier is the amplifier whose output frequency is between 20 Hz to 20 kHz, and the output needs a certain voltage value without requiring a very strong current.

低频电压放大器是指工作频率在20赫~20千赫之间、输出要求有一定电压值而不要求很强的电流的放大器。

共发射极放大电路

common emitter amplifier circuit

LDO,DC-DC,MOSFETs,TVS,AC-DC,电压检测器,POWER IC,IGBT,MOS,负载开关,TOREX,茂捷,AOS,松木代理商_深圳市泰德兰电子有限公司

Figure 1 (a) is a common emitter amplifier. C1 is the input capacitor, C2 is the output capacitor, the transistor VT is the amplifying device, RB is the base bias resistor, and RC is the collector load resistor. The 1 and 3 ends are input, and the 2 and 3 ends are output. The 3 terminal is the common point, which is usually grounded, also known as the "ground" end. The DC path at static state is shown in Figure 1 (b), and the AC path is shown in Figure 1 (c). The characteristic of the circuit is that the voltage magnification from more than ten to more than 100, the phase of the output voltage is opposite to the input voltage, and the performance is not stable enough, which can be used in general situations.

图1(a)是共发射极放大电路。C1是输入电容,C2是输出电容,三极管VT就是起放大作用的器件,RB是基极偏置电阻,RC是集电极负载电阻。1、3端是输入,2、3端是输出。3端是公共点,通常是接地的,也称“地”端。静态时的直流通路见图1(b),动态时交流通路见图1(c)。电路的特点是电压放大倍数从十几到一百多,输出电压的相位和输入电压是相反的,性能不够稳定,可用于一般场合。

低频电压放大电路图

Low frequency voltage amplification circuit diagram 


分压式偏置共发射极放大电路

divider bias common emitter amplifier

LDO,DC-DC,MOSFETs,TVS,AC-DC,电压检测器,POWER IC,IGBT,MOS,负载开关,TOREX,茂捷,AOS,松木代理商_深圳市泰德兰电子有限公司

Figure 2 Figure 1 with more than 3 elements. The base voltage is obtained by partial pressure of RB1 and RB2, so it is called partial voltage bias. The emitter increases resistance RE and capacitance CE, CE is called AC bypass capacitor, which is short circuited for AC, while RE has direct current negative feedback function. Feedback refers to the way that output changes to the input part in some way, as part of input. If the returned part is subtracted from the original input part, it means negative feedback. The real input voltage of the base is the difference between the voltage on the RB2 and the voltage on the RE, so it's negative feedback. Because of the above two measures, improving the stability of the circuit is the most widely used amplification circuit.

图2比图1多用3个元件。基极电压是由RB1和RB2分压取得的,所以称为分压偏置。发射极中增加电阻RE和电容CE,CE称交流旁路电容,对交流是短路的;RE则有直流负反馈作用。所谓反馈是指把输出的变化通过某种方式送到输入端,作为输入的一部分。如果送回部分和原来的输入部分是相减的,就是负反馈。图中基极真正的输入电压是RB2上电压和RE上电压的差值,所以是负反馈。由于采取了上面两个措施,使电路工作稳定性能提高,是应用最广的放大电路。

低频电压放大电路图

Low frequency voltage amplification circuit diagram 


射极输出器

emitter output device


图3(a)是一个射极输出器。它的输出电压是从射极输出的。图3(b)是它的交流通路图,可以看到它是共集电极放大电路。

Figure 3 (a) is an emitter output. Its output voltage is output from the emitter. Figure 3 (b) is its AC path diagram, which can be seen as a common collector amplifying circuit.


这个图中,晶体管真正的输入是Vi和Vo的差值,所以这是一个交流负反馈很深的电路。由于很深的负反馈,这个电路的特点是:电压放大倍数小于1而接近1,输出电压和输入电压同相,输入阻抗高输出阻抗低,失真小,频带宽,工作稳定。它经常被用作放大器的输入级、输出级或作阻抗匹配之用。

In this diagram, the real input of transistors is the difference between Vi and Vo, so this is a very deep circuit with alternating negative feedback. Because of the deep negative feedback, the circuit is characterized by: the voltage magnification is less than 1 and close to 1, the output voltage and the input voltage are in the same phase, the input impedance is low, the distortion is small, the frequency band is wide, and the work is stable. It is often used as input stage, output stage of amplifier, or for impedance matching.

LDO,DC-DC,MOSFETs,TVS,AC-DC,电压检测器,POWER IC,IGBT,MOS,负载开关,TOREX,茂捷,AOS,松木代理商_深圳市泰德兰电子有限公司

低频电压放大电路图

Low frequency voltage amplification circuit diagram 


低频放大器的耦合

coupling of low frequency amplifier


一个放大器通常有好几级,级与级之间的联系就称为耦合。放大器的级间耦合方式有三种:①RC耦合,见图4(a)。优点是简单、成本低。但性能不是最佳。②变压器耦合,见图4(b)。优点是阻抗匹配好、输出功率和效率高,但变压器制作比较麻烦。③直接耦合,见图4(c)。优点是频带宽,可作直流放大器使用,但前后级工作有牵制,稳定性差,设计制作较麻烦。

A amplifier usually has several levels, and the connection between level and level is called coupling. There are three ways of interstage coupling between Amplifiers: (1) RC coupling, see Figure 4 (a). The advantages are simple and low cost. But the performance is not the best. (2) transformer coupling, as shown in Figure 4 (b). The advantages are good impedance matching, high output power and efficiency, but transformer manufacturing is rather troublesome. (3) direct coupling, as shown in Figure 4 (c). The advantage is that the bandwidth is wide and can be used as a DC amplifier, but the work of front and rear stage is tied up, the stability is poor, and the design and manufacture is troublesome.

低频电压放大电路图

Low frequency voltage amplification circuit diagram 


阻容耦合分压偏置共发射极电压放大电路如图3.7a.1所示。该电路中的双极型晶体管T是电路中的放大器件,它能把输入回路(基极—发射极)中微小的电流信号在输出回路中(集电极—发射极)放大为一定大小的电流信号。输出回路中得到的较大输出电流是源自直流电源,双极型晶体管在电路中实际上起着电流控制作用。UCC电源提供放大电路能量,还为双极型晶体管的集电极提供反向偏置,使其处于放大工作状态;并通过基极电阻RCCUB1和RB2的分压,提供合适的基极电压,调节电位器RP的阻值可以改变基极电流,从而改变集电极电流。

The resistance capacitance coupled partial voltage bias common emitter voltage amplifying circuit is shown in figure 3.7a.1. The bipolar transistor T in the circuit is an amplifier in the circuit. It can amplify a small current signal in the input circuit (the base emitter) in the output circuit (the collector emitter) to a certain size of the current signal. The larger output current in the output circuit is derived from the DC power supply, and the bipolar transistor actually acts as a current control in the circuit. The UCC power supply provides the power of the amplifying circuit, and provides the reverse bias for the bipolar transistor collector to be in the amplifying state, and provides the appropriate base voltage through the partial voltage of the base resistance RCCUB1 and RB2, and adjusts the resistance of the potentiometer RP to change the base current, thereby changing the collector current.

LDO,DC-DC,MOSFETs,TVS,AC-DC,电压检测器,POWER IC,IGBT,MOS,负载开关,TOREX,茂捷,AOS,松木代理商_深圳市泰德兰电子有限公司

集电极电阻RC可以将集电极电流的变化变换为集电极电压的变化,在输出回路中得到放大的电压信号。发射极电阻RE对集电极电流的直流分量有负反馈的作用,稳定了静态工作电流。发射极电容CE对集电极电流的交流分量提供了交流通路,起了分流交流作用。C1、C2能够分隔直流电位,通过交流分量电流,起到隔直流通交流的作用;它们分别把交流信号电流输入基极以及把放大后的交流信号电压送到负载端,而不影响晶体管的直流工作状态。

The collector resistance RC can transform the change of collector current to the change of collector voltage, and gain amplified voltage signal in the output circuit. The emitter resistance RE has negative feedback effect on the DC component of the collector current, stabilizing the quiescent current. The emitter capacitance CE provides an AC path to the AC component of collector current, and plays a role of shunt communication. C1 and C2 can separate the DC potential and communicate by AC component current, which input the AC signal current to the base and send the amplified AC signal voltage to the load end, without affecting the DC working state of the transistor.


品质第一

品质第一

Quality first
价格合理

价格合理

price is reasonable
交货快捷

交货快捷

Fast delivery
服务至上

服务至上

Service-oriented
凝聚客户

凝聚客户

Convergence of customers
产品中心
AOS
茂捷
特瑞仕
松木
新洁能MOS管
解决方案
解决方案
关于我们
公司介绍
企业文化
组织架构
新闻中心
投诉建议
关注我们
微信公众号扫描
联系电话:0755-83322522
友情链接:电子元器件商城 合肥按摩椅专卖店 多级给水泵 电子负载 音频变压器 合肥大金中央空调 电子散热器 排针连接器 安全光栅 安检设备厂家 PE电熔管件 电池巡检仪 植物灯电源 电动洗地机 电位器厂家 工业液晶显示器 usb数据线厂家 光纤通信 香烟批发 触控一体机 湖南中央空调

QQ客服联系客服

联系电话0755-83322522