500MHZ Broadband Amplifier Circuit

Published:2011/7/13 6:07:00 Author:Sue | Keyword: Broadband, Amplifier | From:SeekIC

As seen in the figure is the 500MHZ broadband amplifier circuit. OPA660 can be used to compose direct feedback amplifier with a bandwidth of 500MHz. The input stage consists of OPA660 transconductance amplifier whose gain is decided by feedback resistor R3,R5. Its input stage's voltage gain is G=1+R3/2R5. When the output voltage range is 100mV, the broad width can reach 331MHz; When the output voltage range is 300 mV, the broad width is 362MHz; When the output voltage range is 700mV, the broad width is 520MHz; When the output voltage range is 1.4v, the broad width is 552MHz; When the output voltage range is 2.5v, the brand width is 490 MHz. The circuit uses double 5v as power supply.



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