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    • 6. 发明申请
    • MULTIPLE FREQUENCY CONVERTER USING DIGITAL MIXERS
    • 使用数字混合器的多个频率转换器
    • WO02089313A3
    • 2003-08-07
    • PCT/GB0201973
    • 2002-04-30
    • ANDREW CORPKENINGTON PETERCOPE MARKMEADE STEVENROBERTSON MARK
    • KENINGTON PETERCOPE MARKMEADE STEVENROBERTSON MARK
    • H03D7/16
    • H03D7/161
    • When using a DSP to digitally predistort the RF input to a power amplifier, it is necessary to downconvert the frequency the of the input signal to enable it to be processed by the DSP. The predistored amplifier input signal produced by the DSP is then upconverted to its original frequency and supplied to the power amplifier. The downconverter and the upconverter processes each comprise a number of mixers that operate in series upon the amplifier input signal. Each of the mixers mixes a respective reference signal into the amplifier input signal to change the latter's frequency. All of the reference signals are derived from the same reference oscillator. If the total number of mixers that perform high-sided mixing is constrained to be even, then frequency errors associated with the downconversion and subsequent upconversion are eliminated.
    • 当使用DSP对功率放大器的RF输入进行数字预失真时,需要对输入信号的频率进行下变频,以使其能够被DSP处理。 然后由DSP产生的预先放大的输入信号上变频到其原始频率并提供给功率放大器。 下变频器和上变频器过程各自包括多个混合器,其在放大器输入信号上串联操作。 每个混频器将相应的参考信号混合到放大器输入信号中以改变其频率。 所有的参考信号都是从相同的参考振荡器得到的。 如果执行高侧混合的混合器的总数被限制为均匀,则与下转换和随后的上转换相关的频率误差被消除。
    • 7. 发明申请
    • FREQUENCY CONVERSION OF SIGNALS
    • 信号频率转换
    • WO2002089313A2
    • 2002-11-07
    • PCT/GB2002/001973
    • 2002-04-30
    • WIRELESS SYSTEMS INTERNATIONAL LIMITEDKENINGTON, PeterCOPE, MarkMEADE, StevenROBERTSON, Mark
    • KENINGTON, PeterCOPE, MarkMEADE, StevenROBERTSON, Mark
    • H03D7/00
    • H03D7/161
    • When using a DSP to digitally predistort the RF input to a power amplifier, it is necessary to downconvert the frequency the of the input signal to enable it to be processed by the DSP. The predistored amplifier input signal produced by the DSP is then upconverted to its original frequency and supplied to the power amplifier. The downconverter and the upconverter processes each comprise a number of mixers that operate in series upon the amplifier input signal. Each of the mixers mixes a respective reference signal into the amplifier input signal to change the latter's frequency. All of the reference signals are derived from the same reference oscillator. If the total number of mixers that perform high-sided mixing is constrained to be even, then frequency errors associated with the downconversion and subsequent upconversion are eliminated.
    • 当使用DSP对功率放大器的RF输入进行数字预失真时,需要对输入信号的频率进行下变频,以使其能够被DSP处理。 然后由DSP产生的预先放大的输入信号上变频到其原始频率并提供给功率放大器。 下变频器和上变频器过程各自包括多个混合器,其在放大器输入信号上串联操作。 每个混频器将相应的参考信号混合到放大器输入信号中以改变其频率。 所有的参考信号都是从相同的参考振荡器得到的。 如果执行高侧混合的混合器的总数被限制为均匀,则与下转换和随后的上转换相关的频率误差被消除。