Patent ID: 8781410
Filing Date: 2014-07-15
Classification: H03F,H04B,H04W,Y02D

Abstract:
1. A radio communication device comprising at least one of a signal transmitter and a signal receiver, wherein the signal transmitter comprises: a signal transmission circuit configured to modulate an input radio signal inputted from an outside based on a first oscillation signal, and to transmit the modulated input radio signal from an antenna; and a first transmission circuit configured to transmit the first oscillation signal to the signal transmission circuit, and the signal receiver comprises: a signal reception circuit configured to demodulate a reception signal received at the antenna based on the first oscillation signal or based on a second oscillation signal different from the first oscillation signal, and to output the demodulated reception signal to an outside; and a second transmission circuit configured to transmit the first or second oscillation signal to the signal reception circuit, wherein each of the first and the second transmission circuits comprises a plurality of buffer circuits connected in series, wherein each of the buffer circuits comprises: a capacitor comprising a first terminal and a second terminal, an input signal being inputted to the first terminal; a first inverting amplifier circuit configured to invert and amplify a signal of the second terminal of the capacitor; a second inverting amplifier circuit configure to invert and amplify an output signal of the first inverting amplifier circuit; and a MOS (Metal Oxide Semiconductor) transistor comprising a third terminal, a fourth terminal and a gate, the third terminal being connected to the second terminal of the capacitor, the fourth terminal being connected to a connection node of the first and the second inverting amplifier circuits, an inversion signal of the input signal being inputted to the gate.