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Thank everybody's replies . vswr ,This is really a kind of method 。But the total electric current is limited within 33mA, so it is difficult to use two amplifiers.
thanks, I have already looked for on websites of these two companies. but Reverse isolation 36dB can't be satisfied . Where can find so high isolation ampifier.
Please recommend an amplifier chip
The following of index
Frequency 10-500MHz
small signal Gain(min) 17dB
Gain flatness(max) 0.2dB
Reverse isolation 36dB
Noise Figure 4dB
Power output 1dB 8dBm
ip3 20dBm...
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