Transceivers for near field communication, near field communication devices, and electronic systems having the same

摘要

A transceiver for near field communication may include: a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave to communicate data with an external device; a first capacitor coupled between the first node and a third node; a second capacitor coupled between the second node and a fourth node; and/or a filter coupled among a first transmission electrode, a second transmission electrode, the third node, and the fourth node in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode.

主权项

1. A transceiver for near field communication (NFC), the transceiver comprising:
a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave to communicate data with an external device; a first capacitor coupled between the first node and a third node; a second capacitor coupled between the second node and a fourth node; and a filter comprising a first terminal coupled to the third node, a second terminal coupled to the fourth node, a third terminal a coupled to a first transmission electrode, and a fourth terminal coupled to a second transmission electrode in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode; wherein the filter further comprises:
a first inductor coupled between the third node and the first transmission electrode or between the third node and a ground; anda second inductor coupled between the fourth node and the second transmission electrode or between the fourth node and the ground; wherein an inductance of the first inductor is greater than an inductance of the second inductor.