Abstract
A transmitting circuit is disclosed. The transmitting circuit is applied to an input output interface. The transmitting circuit includes: a first stage having a plurality of active MOS for receiving an input voltage signal and outputting a first voltage, wherein the plurality of active MOS having an inductance characteristic in high frequency for compensating the bandwidth of the first voltage signal; a second stage for generating a first outputting voltage signal in response to the first voltage signal; an active negative feedback circuit for enhancing the bandwidth of the first outputting voltage signal; and a current buffer for receiving the first outputting voltage signal with enhanced bandwidth and enhancing the gain of the first outputting voltage signal. The first outputting voltage signal outputting from the current buffer will compensate a second voltage signal outputting from the first stage, and the gain and bandwidth of the second voltage signal will be enhanced. Thereby, the second stage outputs a second outputting voltage signal in response to the second voltage signal.