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THS4503: OPA627+THS4503

Part Number: THS4503
Other Parts Discussed in Thread: OPA627, OPA656, LMH6551, THS4541

Hi team,

The voltage follower is constructed by OPA627, and then connected to THS4503 amplifier. It is correct to test the output of OPA627 separately. When the input signal is directly connected to the THS4503 amplifier circuit, the output is also correct. But when OPA627 voltage follower is connected with THS4503 amplifier, the output is not correct. I'd like to know why and how to fix it output correctly. The attachment is Tina simulation file.

I consider the output resistance (55 Ω) of OPA627. The amplifier circuit of THS4503 adopts the parameters in Table 4 of the datasheet.


Best Regards,
Amy Luo