SYSTEM AND METHOD FOR CONTROLLING RADIO FREQUENCY TRANSMISSIONS IN AN ELECTRONIC DEVICE
摘要
The invention relates to a system and method for attenuating harmonics in output signals. In the system, an electronic circuit for reducing harmonics of an output signal from a power amplifier in a transmission circuit for a wireless communication device is provided. The circuit comprises: a printed circuit board (PCB); a power amplifier for generating an output signal; and a circuit implemented on the PCB connected to an output terminal of the power amplifier for the output signal. The circuit comprises a first filtering stage; a delay element; and a harmonic filter. The delay element is located between the harmonic filter and the output terminal and the delay element provides a timing delay in the output signal through at least one 0 ohm-rated component. Also, the harmonic filter is a low pass filter having a frequency cut-off point that attenuates first order harmonics of the output signal.
申请公布号
CA2618244(C)
申请公布日期
2014.10.28
申请号
CA20082618244
申请日期
2008.01.18
申请人
RESEARCH IN MOTION LIMITED
发明人
ZHU, LIZHONG;MANKARUSE, GEORGE;CORRIGAN, MICHAEL;XU, JUN;NICKERSON, KENT