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    • 4. 发明授权
    • Sigma delta (ΣΔ) transmitter circuits and transceiver using the same
    • Sigma delta(SigmaDelta)发射机电路和收发器使用相同
    • US07426377B2
    • 2008-09-16
    • US11207003
    • 2005-08-19
    • Satoshi TanakaKazuyuki HoriManabu KawabeYukinori AkamineMasumi KasaharaKazuo Watanabe
    • Satoshi TanakaKazuyuki HoriManabu KawabeYukinori AkamineMasumi KasaharaKazuo Watanabe
    • H04B1/06
    • H04B1/406H04B1/0003
    • A ΣΔ transmitter that permits setting of a loop filter LF, a charge pump current and other factors to the same conditions even if it is operated in a plurality of frequency bands, therefore allows the number of components to be reduced and at the same time enables the angle between the phases of local signals for reception use to be close to exactly 90°, which is a feature ensuring robustness against inter-element variations and accordingly suitable for large scale integration, is to be provided. The oscillation frequency of a VCO is set to an even-number multiple of the transmit frequency, and generates transmit signals via a divider. A device that varies the gain according to the amplitude component of modulating signals is added to an amplifier whose input is signals from the VCO, and the transmission of modulating signals involving amplitude modulation, such as EDGE, is thereby made possible.
    • 即使在多个频带中工作的情况下,也可以将环路滤波器LF,电荷泵电流和其他因素设定为相同条件的SigmaDelta发送器,因此允许减少部件的数量,并且同时启用 要提供用于接收的本地信号的相位之间的角度接近正好90°,这是确保对元件间变化的鲁棒性并因此适合于大规模集成的特征。 将VCO的振荡频率设定为发送频率的偶数倍,经由分频器生成发送信号。 根据调制信号的幅度分量来改变增益的装置被添加到其输入是来自VCO的信号的放大器,并且由此使得涉及幅度调制(例如EDGE)的调制信号的传输成为可能。