低功耗高增益寬帶放大器外文翻譯-其他專(zhuān)業(yè)(編輯修改稿)
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【文章內(nèi)容簡(jiǎn)介】 ifiers Main article: Valve amplifier The glow from four Electro Harmonix KT88 brand power tubes lights up the inside of a Traynor YBA200 guitar amplifier According to Symons, while semiconductor amplifiers have largely displaced valve amplifiers for low power applications, valve amplifiers are much more cost effective in high power applications such as radar, countermeasures equipment, or munications equipment (p. 56). Many microwave amplifiers are specially designed valves, such as the klystron, gyrotron, traveling wave tube, and crossedfield amplifier, and these microwave valves provide much greater singledevice power output at microwave frequencies than solidstate devices (p. 59).[2] Valves/tube amplifiers also have niche uses in other areas, such as in russian military aircraft, for their EMP tolerance niche audio for their sound qualities Transistor amplifiers Main articles: Transistor, Bipolar junction transistor, Audio amplifier, and MOSFET The essential role of this active element is to magnify an input signal to yield a significantly larger output signal. The amount of magnification (the forward gain) is determined by the external circuit design as well as the active device. Many mon active devices in transistor amplifiers are bipolar junction transistors (BJTs) and metal oxide semiconductor fieldeffect transistors (MOSFETs). 中北大學(xué) 2021 屆畢業(yè)設(shè)計(jì)說(shuō)明書(shū) 第 6 頁(yè) 共 15 頁(yè) Applications are numerous, some mon examples are audio amplifiers in a home stereo or PA system, RF high power generation for semiconductor equipment, to RF and Microwave applications such as radio transmitters. Transistorbased amplifier can be realized using various configurations: for example with a bipolar junction transistor we can realize mon base, mon collector or mon emitter amplifier。 using a MOSFET we can realize mon gate, mon source or mon drain amplifier. Each configuration has different characteristic (gain, impedance...). Operational amplifiers (opamps) Main articles: Operational amplifier and Instrumentation amplifier An operational amplifier is an amplifier circuit with very high open loop gain and differential inputs which employs external feedback for control of its transfer function or gain. Although the term is today monly applied to integrated circuits, the original operational amplifier design was implemented with valves. Fully differential amplifiers (FDA) Main article: Fully differential amplifier A fully differential amplifier is a solid state integrated circuit amplifier which employs external feedback for control of its transfer function or gain. It is similar to the operational amplifier but it also has differential output pins. Video amplifiers These deal with video signals and have varying bandwidths depending on whether the video signal is for SDTV, EDTV, HDTV 720p or 1080i/p etc.. The specification of the bandwidth itself depends on what kind of filter is used and which point (1 dB or 3 dB for example) the bandwidth is measured. Certain requirements for step response and overshoot are necessary in order for acceptable TV images to be presented. Oscilloscope vertical amplifiers These are used to deal with video signals to drive an oscilloscope display tube and can have bandwidths of about 500 MHz. The specifications on step response, rise time, overshoot and aberrations can make the design of these amplifiers extremely difficult. One of the pioneers in high bandwidth vertical amplifiers was the Tektronix pany. 中北大學(xué) 2021 屆畢業(yè)設(shè)計(jì)說(shuō)明書(shū) 第 7 頁(yè) 共 15 頁(yè) Distributed amplifiers Main article: Distributed Amplifier These use transmission lines to temporally split the signal and amplify each portion separately in order to achieve higher bandwidth than can be obtained from a single amplifying device. The outputs of each stage are bined in the output transmission line. This type of amplifier was monly used on oscilloscopes as the final vertical amplifier. The transmission lines were often housed inside the display tube glass envelope. Switched mode amplifiers These nonlinear amplifiers have much higher efficiencies than linear amps, and are used where the power saving justifies the extra plexity. Negative resistance devices Negative resistances can be used as amplifiers, such as the tunnel diode amplifier. Microwave amplifiers Travelling wave tube (TWT) amplifiers Main article: Traveling wave tube Used for high power amplification at low microwave frequencies. They typically can amplify across a broad spectrum of frequencies。 however, they ar
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