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    • 6. 发明申请
    • Method, System and Apparatus for Balanced Frequency Up-Conversion of a Baseband Signal
    • 用于基带信号平衡上变频的方法,系统和装置
    • US20120114078A1
    • 2012-05-10
    • US13323550
    • 2011-12-12
    • David F. SorrellsMichael J. BultmanRobert W. CookRichard C. LookeCharley D. Moses, JR.Gregory S. RawlinsMichael W. Rawlins
    • David F. SorrellsMichael J. BultmanRobert W. CookRichard C. LookeCharley D. Moses, JR.Gregory S. RawlinsMichael W. Rawlins
    • H04L27/00
    • H04B1/0475H03C3/40H03D3/006H03D7/00H04L25/03
    • A balanced transmitter up-converts a baseband signal directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operation, the balanced modulator sub-harmonically samples the baseband signal in a balanced and differential manner, resulting in harmonically rich signal. The harmonically rich signal contains multiple harmonic images that repeat at multiples of the sampling frequency, where each harmonic contains the necessary information to reconstruct the baseband signal. The differential sampling is performed according to a first and second control signals that are phase shifted with respect to each other. In embodiments of the invention, the control signals have pulse widths (or apertures) that operate to improve energy transfer to a desired harmonic in the harmonically rich signal. A bandpass filter can then be utilized to select the desired harmonic of interest from the harmonically rich signal. The sampling modules that perform the sampling can be configured in either a series or a shunt configuration. In embodiments of the invention, DC offset voltages are minimized between the sampling modules to minimize or prevent carrier insertion into the harmonic images.
    • 平衡发射机直接从基带到RF RF转换基带信号。 上转换过程是足够的线性,即使在对频谱增长有严格要求的通信应用中也不需要IF处理。 在运行中,平衡调制器以平衡和差分的方式对基带信号进行子谐波采样,从而产生谐波丰富的信号。 谐波丰富的信号包含以抽样频率的倍数重复的多个谐波图像,其中每个谐波包含必要的信息以重构基带信号。 根据相对于彼此相移的第一和第二控制信号执行差分采样。 在本发明的实施例中,控制信号具有脉冲宽度(或孔径),其操作以改善在谐波丰富信号中的期望谐波的能量传递。 然后可以利用带通滤波器从谐波丰富的信号中选择所需要的谐波。 执行采样的采样模块可以以串联或分流配置进行配置。 在本发明的实施例中,采样模块之间的DC偏移电压最小化,以最小化或防止载波插入到谐波图像中。