| 摘要 |
<p>An integrated circuit chip comprises a reference voltage generator circuit (21), a connection pad (22) for an external input and/or output, an electrostatic discharge (ESD) protection (24) at said connection pad, and a differential amplifier (26) with a differential input transistor pair (261), an output buffer stage (262), and a negative feedback (27). A reference voltage output from said reference voltage generator circuit is connected to the pad and to an input of the differential amplifier. For reducing a variation in the output voltage of the differential amplifier, a low-pass filter circuit (C RF , R RF ) is connected to a signal path between the connection pad and the input of the differential amplifier for attenuating a RF interference signal at the input of the differential pair in the amplifier, and therefore also the output voltage drop caused by a peak detection operation of the differential input transistor pair will stay lower.</p> |
