| 摘要 |
<p>An amplifier system embodying the invention includes an input stage comprising one or more differential amplifier (A1, A2) having a high degree of common mode rejection. The inputs of the differential amplifier (A1, A2) are adapted to receive small information signals riding on large common mode signals. The high degree of common mode maintains the gain of the amplifiers relatively constant over a wide range of common mode signals. The outputs of the differential amplifier are connected in common to an output node (30) to sum their output signals and reduce random noise associated with the input signals and input stage. The output node (30) of the input stage is coupled to a second amplifier stage (A3) whose output is coupled to a third output stage (A4) to reduce the effect of amplifier offset.</p> |
