Patent ID: 8344804

Claim:
A common-mode feedback circuit, comprising: an amplifying circuit; a biasing circuit connected with said amplifying circuit; and a feedback loop connecting said amplifying circuit with said biasing circuit, wherein said feedback loop comprises a first field effect transistor, a eighth field effect transistor connected with said first field effect transistor, a tenth field effect transistor and an eleventh field effect transistor connecting said eighth field effect transistor and said tenth field effect transistor, wherein a common-mode voltage value is adjusted by said eleventh field effect transistor, wherein a grid electrode of said first field effect transistor is connected with a source electrode of said eleventh field effect transistor, a drain electrode of said first field effect transistor is connected with a source electrode of said eighth field effect transistor and a source electrode of said tenth field effect transistor, a source electrode of said first field effect transistor is connected with ground.