Datasheet > AN-2235

AN-2235

更新时间： 2022-04-28 00:39:26

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
6页	3214K
描述
AN-2235 Circuit Board Design for LMH6517/21/22 and Other High-Speed IF/RF Feedback Amplifiers

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AN-2235 数据手册

General Description

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Common Mode Terminated

at all Frequencies

1 mH

LMH6521

1 mH

Figure 5. Amplifier With Common Mode Load

Common Mode Shorted to

Ground at High Frequencies

1 mH

LMH6521

1 mH

Figure 6. Amplifier With High-Frequency Common Mode Load

Differential signal paths are chosen due to their immunity to many forms of noise. This is because most

distant noise sources will couple into a differential signal path as common-mode noise rather than

differential noise. In theory, common-mode noise on a differential signal path is of little concern since

many elements in the signal path will “reject” the common-mode noise. This is correct in many cases.

However, care must still be taken to keep the signal free from excessive noise. One reason is that at very

high frequencies many active elements do not have very good common-mode rejection (CMRR). Baluns

are one circuit element that have poor CMRR at very high frequencies. Many amplifiers also have trouble

suppressing common-mode noise at very high frequencies. Many high-speed analog-to-digital converters

(ADC) do not even specify CMRR at all.

-10

Maximum Gain

16dB Attenuation

-20

-30

-40

-50

-60

-70

-80

100

1000

FREQUENCY (MHz)

Figure 7. CMRR of the LMH6522 DVGA

AN-2235 Circuit Board Design for LMH6517/21/22 and Other High-Speed

IF/RF Feedback Amplifiers

SNOA869A–April 2012–Revised May 2013

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