Patent ID: 8446178
Filing Date: 2013-05-21
Classification: H03F

Abstract:
1. A comparator, comprising: a pre-amplification module, configured to generate two amplified differential signal reference currents according to an input voltage and a reference voltage; and a differential signal obtaining module, configured to obtain a differential signal according to the two amplified differential signal reference currents output by the pre-amplification module, wherein the pre-amplification module comprises a differential unit, an offset unit, and an amplification unit; the differential unit is configured to generate two direct current bias currents according to the input voltage and the reference voltage; the offset unit is configured to generate an offset current of the two direct current bias currents, so as to reduce magnitude of the two direct current bias currents and obtain two differential signal reference currents; and the amplification unit is configured to receive the two differential signal reference currents, and perform amplification processing on the two differential signal reference currents, wherein the differential unit comprises at least one differential pair formed by two MOS field effect transistors; the amplification unit comprises at least two MOS transistors for mirroring the two direct current bias currents and at least two MOS transistors for amplifying the two differential signal reference currents.