Patent ID: 6977968

Claim:
A transmitter comprising: a quadrature modulator for quadrature modulating an in-phase component and a quadrature-phase component of a complex input signal; a power amplifier connected downstream of the quadrature modulator; a quadrature demodulator for quadrature demodulating the output signal of the power amplifier into a feedback in-phase component and a feedback quadrature-phase component; a first differential amplifier connected upstream of the quadrature modulator, said first differential amplifier having a first input to which the in-phase component of the input signal is applied and a second input to which the feedback in-phase component is applied; and a second differential amplifier connected upstream of the quadrature modulator, said second differential amplifier having a first input of the second differential amplifier to which the quadrature-phase component of the input signal is applied and a second input of the second differential amplifier to which the feedback quadrature-phase component is applied, wherein an output of the first differential amplifier is directly connectable to the second input of the first differential amplifier via a first direct DC signal path, bypassing the quadrature modulator, the power amplifier and the quadrature demodulator, when switching from a transmission mode into a transmission-interrupt mode, and wherein an output of the second differential amplifier is directly connectable to the second input of the second differential amplifier via a second direct DC signal path, bypassing the quadrature modulator, the power amplifier and the quadrature demodulator, when switching from the transmission mode into the transmission-interrupt mode.