ADI 领导世界新潮流的新型放大器技术[Ⅱ] ADI

简介：ADI 领导世界新潮流的新型放大器技术[Ⅱ]

问：我要放大毫伏级的、频率上限为1MHz的正弦信号到几个伏，要求对幅度有精确的线形放大，相移有精确的控制（幅度和相位是我最后想得到的量，用来和另一个信号做比较输出，因为是用在科学测量中的，要求较高），请问ADI在这种应用上有没有很成熟、造价也是比较合理的解决方案？
我对放大器在如此弱的信号下实现上千倍的放大，还要有上MHz的频率响应，不是很有信心。
答： Use the highest speed precision amplifier you can for the first stage (depending on supply voltages and other considerations). You"ll probably need 2-3 stages of gain to minimize the phase shift and prevent gain limiting due to GBW limitations of the

问：我使用过或正在使用的adi芯片有AD6620、AD9852、AD9225、AD8056，使用AD8056作9225的差分输入如何？有没有其它（低噪声）的选择？
答： Not so good using AD8056.
Please use AD8138, which has OCM pin to shift comm mode voltage to AD9225 CML output.

问：希望得到微波/射频放大器方面的书面介绍资料
答： Please contact ADI local office or Distibutor, then we can mail to you!

问：Pls explain the following terms:
1,Source current
2,sink current
3,pls explain the relationship between the Bias Current and Input Resistor
Thanks!
答： The amplifier has the ability to source and sink the current.  For example if the load is at ground and the signal is below ground. (dual supplies) The amplifier will actually be sinking the current through the output.  If the signal is

问：我使用AD7714，应选择哪种仪表放大器和滤波器？对电源有无特殊要求？
答： Try AD8628 low noise auto-zero amplifier for input buffering to achieve highest accuracy.

问：请问当放大器放大线性度不好时应如何调节，如ad8001,datasheet中并未给出具体解决方案
答： 先确保信号大小合适，增益不要太大，可适当加补偿网络。

问：我想从以太网的网线上用运放来取信号(100Mbps MLT3编码)，我用了AD8130(Gain=1)，但是取下的信号和实际的信号有变形(用示波器比较过)，请问我还有那款放大器可以试试的？
谢谢！
答： It"s maybe the problem with too high signal amplitude. Using higher power supply or higher s/r amplifier may help.

问：放大器零飘自动调整的电路该如何设计。
有没有具备数字接口的可调整零飘电压和放大倍数的器件。
答： The best way to achieve zero drift is to use an auto-zero amplifier at the front end. Choose AD8628, AD8551 or AD8571 amplifiers.ADI does not presently offer an amplifier part with a user programmable offset adjustment but we are working on parts like this

问：调零放大器对频率特性有何要求？它如何和信号通道隔离？
答： Typical auto-zero amplifiers can generate intermodulation voltages with the input signal. They also have digital switching noise at the auto-zero clock frequency and it"s harmonic frequencies. ADI auto-zero amplifiers have been designed to minimize th

问：Dear Experts/Specialists:
I am wondering whether you have the low power sonsumption mv DC amplifer, and the smaple circuit and price/unit?
Thanks!
Phillip
答： we have a low power instrumentation amplifier, the AD627. The price is approximately 2.75 for 100 piece quantities