HMC1121 PA芯片的VDET信号 - Translation: VDET signal of HMC1121 PA chip

Question

HMC1121 PA芯片的VDET信号外接一个运放来实现功率检测，能否推荐一下芯片手册中的Fig 33中的信号放大器的规格型号。 
 另外，这个信号放大器使用单+5V电源是否可以，Fig33中图示的是&plusmn;5V的双电源。 
 谢谢！ 
 Translation: 
 The VDET signal of the HMC1121 PA chip is externally connected to an operational amplifier to realize power detection. Can you recommend the specification and model of the signal amplifier in Fig. 33 in the chip manual.

In addition, is it possible to use a single +5V power supply for this signal amplifier? The figure shown in Fig.33 is a dual power supply of &plusmn;5V.

Thanks!

enash · Accepted Answer

This plot is on a linear scale so that the negative voltage can be shown (the plot in the datasheet is on a log scale).)

enash · Answer

Unfortunately, you cannot get away with a single positive supply voltage. The attached plot shows the individual Vref and Vdet voltages. As you can see, as the output power increases, Vdet goes negative. The negative supply does not have to be -5V . A -1V or -2V negative supply would probably suffice. For the op amp, we recommend AD8638.

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HMC1121 PA芯片的VDET信号 - Translation: VDET signal of HMC1121 PA chip

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