Patent ID: 8854134
Filing Date: 2014-10-07
Classification: H03F

Abstract:
1. A chip card comprising: a signal source configured to generate a signal to be transmitted via radio; a p-channel field effect transistor having a gate terminal, a source terminal and a drain terminal and being coupled with its source terminal to an upper supply potential and with its drain terminal to a common node; an n-channel field effect transistor having a gate terminal, a source terminal and a drain terminal and being coupled with its drain terminal to the common node and with its source terminal to a lower supply potential; an operational amplifier having a positive input terminal, a negative input terminal and an output terminal, wherein the positive input terminal is coupled to the common node, the negative input terminal is coupled to the signal source and the output terminal is coupled to the gate terminal of the p-channel field effect transistor and to the gate terminal of the n-channel field effect transistor; and an antenna coupled to the common node, wherein the operational amplifier, the p-channel field effect transistor and the n-channel field effect transistor form a first amplifier stage and the chip card comprises a second amplifier stage.