The invention discloses a conversion circuit which can convert a high-speed differential into a single-ended signal. The circuit of the invention comprises a transduction circuit which has two input terminals used for receiving a first current (I1) generated by a first current output terminal and a second current (I2) generated by a second current output terminal after a voltage is input by two differentials, an offset elimination circuit comprising two adjustable current sources which are respectively connected to the first current output terminal and the second current output terminal, a first transimpedance circuit, the input terminal of which can produce a first voltage at the output terminal of the first transimpedance circuit after being connected to the first current output terminal, a second transimpedance circuit, the output terminal of which can produce a second voltage at the output terminal of the second transimpedance circuit after being connected to the second current output terminal, and a first inverter which is connected to the output terminal of the first transimpedance circuit to be used for converting the first voltage into the first single-ended output voltage. The conversion circuit of the invention has no diode-connecting transistor, thus can not cause speed reduction or excessive power loss.