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8310? 可以保證雷達(dá)接收機(jī)有很寬的動(dòng)態(tài)范圍
對(duì)數(shù)放大器是一種特殊的放大電路，其輸出信號(hào)幅度與輸入信號(hào)幅度之間呈現(xiàn)對(duì)數(shù)函數(shù)關(guān)系。8310??主要用于處理那些信號(hào)幅度變化范圍較大的情況，例如雷達(dá)、通信和遙測(cè)等系統(tǒng)中。對(duì)數(shù)放大器具有一些獨(dú)特的特性，例如，當(dāng)輸入信號(hào)較弱時(shí)，它可以作為線性放大器使用，增益較大；而當(dāng)輸入信號(hào)較強(qiáng)時(shí)，它則變?yōu)閷?duì)數(shù)放大器，增益隨輸入信號(hào)的增加而減小。這種特性使得對(duì)數(shù)放大器在雷達(dá)設(shè)備中特別重要，不僅可以保證雷達(dá)接收機(jī)有很寬的動(dòng)態(tài)范圍，還可以限制接收機(jī)輸出的雜波干擾電平，達(dá)到恒虛警的效果。此外，對(duì)于單脈沖雷達(dá)和動(dòng)目標(biāo)顯示雷達(dá)，對(duì)數(shù)放大器還能分別歸一化角誤差信號(hào)和抑制固定目標(biāo)起伏。
在實(shí)現(xiàn)上，基本對(duì)數(shù)放大器采用了跨導(dǎo)線性電路，即基于雙極性三極管（BJT）的對(duì)數(shù)特性來(lái)實(shí)現(xiàn)信號(hào)的對(duì)數(shù)變換。這種跨導(dǎo)線性對(duì)數(shù)放大器在IC設(shè)計(jì)中被廣泛使用。此外，還有一些商業(yè)化的對(duì)數(shù)放大器產(chǎn)品，如AD8304等。
對(duì)數(shù)放大器8310??的選擇和使用需要考慮其特性，例如對(duì)數(shù)斜率和對(duì)數(shù)截距等參數(shù)，這些參數(shù)會(huì)影響放大器的性能和精度。同時(shí)，對(duì)數(shù)放大器也有一些限制和缺點(diǎn)，例如動(dòng)態(tài)范圍較小、溫度影響等，需要在應(yīng)用時(shí)予以注意。
總的來(lái)說(shuō)，對(duì)數(shù)放大器是一種特殊的放大電路，8310??具有處理大動(dòng)態(tài)范圍信號(hào)的能力，廣泛應(yīng)用于雷達(dá)、通信和遙測(cè)等系統(tǒng)中。在選擇和使用對(duì)數(shù)放大器時(shí)，需要充分考慮其特性和限制，以確保系統(tǒng)的性能和穩(wěn)定性。
8310? 可以保證雷達(dá)接收機(jī)有很寬的動(dòng)態(tài)范圍
Logarithmic amplifier is a special amplifier circuit in which the amplitude of the output signal and the amplitude of the input signal show a logarithmic function relationship. The 8310 is designed to handle situations where the signal amplitude varies widely, such as in radar, communications and telemetry systems. Logarithmic amplifiers have some unique characteristics, for example, when the input signal is weak, it can be used as a linear amplifier with large gain; When the input signal is strong, it becomes a logarithmic amplifier, and the gain decreases with the increase of the input signal. This characteristic makes the logarithmic amplifier particularly important in radar equipment, not only can ensure that the radar receiver has a wide dynamic range, but also can limit the clutter interference level of the receiver output to achieve the effect of constant false alarm. In addition, for monopulse radar and moving target display radar, the logarithmic amplifier can normalize the angular error signal and suppress the fluctuation of fixed target respectively.
In the realization, the basic logarithmic amplifier uses a transwire circuit, that is, based on the logarithmic characteristics of bipolar transistor (BJT) to realize the logarithmic transformation of the signal. This cross-wire logarithmic amplifier is widely used in IC design. In addition, there are some commercial logarithmic amplifier products, such as the AD8304.
The selection and use of the logarithmic amplifier 8310 requires consideration of its characteristics, such as parameters such as logarithmic slope and logarithmic intercept, which affect the performance and accuracy of the amplifier. At the same time, logarithmic amplifiers also have some limitations and disadvantages, such as small dynamic range, temperature effect, etc., which need to be paid attention to in application.
In general, the logarithmic amplifier is a special amplifier circuit, and the 8310 has the ability to handle large dynamic range signals, which is widely used in radar, communication and telemetry systems. When selecting and using logarithmic amplifiers, it is necessary to fully consider their characteristics and limitations to ensure the performance and stability of the system.
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