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    • 2. 发明专利
    • Digital-to-analog conversion interface circuit having adjustable time response
    • 具有可调整时间响应的数字到模拟转换接口电路
    • JP2014039276A
    • 2014-02-27
    • JP2013186816
    • 2013-09-09
    • Qualcomm Incorporatedクゥアルコム・インコーポレイテッドQualcomm Incorporated
    • YOUNIS SAEDEMILIA SCHMICKTHOMAS WILBORN
    • H03M3/02H03M7/32H03F3/24H03G3/30H03M3/00
    • H03F3/24H03F2200/331H03G3/3036H03M3/374H03M3/50H03M7/3031
    • PROBLEM TO BE SOLVED: To provide an interface circuit for converting a digital signal to an analog signal.SOLUTION: The interface circuit includes a time response adjustment circuit, a modulator, and a filter. The time response adjustment circuit receives the digital signal and generates an adjusted signal. The modulator couples to the time response adjustment circuit, receives the adjusted signal, and generates a modulator signal. The filter couples to the modulator, receives the modulator signal, and generates the analog signal. The analog signal has a time response that is modified by the time response adjustment circuit. In an embodiment, the time response adjustment circuit includes a gain element, a delay element, and a summer. The gain element receives the digital signal and scales the digital signal by a scaling factor. The delay element receives the digital signal and delays the digital signal by a time delay device. The summer couples to the gain element and the delay element, and sums the scaled signal from the gain element and the delayed signal from the delay element to generate the adjusted signal.
    • 要解决的问题:提供一种用于将数字信号转换为模拟信号的接口电路。解决方案:接口电路包括时间响应调整电路,调制器和滤波器。 时间响应调整电路接收数字信号并产生调整信号。 调制器耦合到时间响应调整电路,接收经调整的信号,并产生调制器信号。 滤波器耦合到调制器,接收调制器信号,并产生模拟信号。 模拟信号具有由时间响应调整电路修改的时间响应。 在一个实施例中,时间响应调整电路包括增益元件,延迟元件和加法器。 增益元件接收数字信号并通过缩放因子对数字信号进行缩放。 延迟元件接收数字信号并通过时间延迟装置延迟数字信号。 加法器耦合到增益元件和延迟元件,并将来自增益元件的定标信号和来自延迟元件的延迟信号相加以产生经调整的信号。
    • 9. 发明专利
    • Nesting-like transimpedance amplifier
    • NESTING-LIKE TRANSIMPEDANCE AMPLIFIER
    • JP2007195189A
    • 2007-08-02
    • JP2007009334
    • 2007-01-18
    • Marvell World Trade Ltdマーベル ワールド トレード リミテッド
    • SUTARDJA SEHAT
    • H03F1/42H03F3/45
    • H03F1/08H03F1/34H03F3/45179H03F3/45475H03F3/45928H03F2200/331H03F2200/36H03F2203/45528H03F2203/45531H03F2203/45652
    • PROBLEM TO BE SOLVED: To provide a transimpedance amplifier of a high gain and a wide bandwidth. SOLUTION: A differential transimpedance amplifier circuitry 3600 has a first operation amplifier 3604 which includes a first inverting input, a first noninverting input, a first inverting output, and a first noninverting output; and a second processing amplifier 3606 which includes a second inverting input, a second noninverting input, a second inverting output, and a second noninverting output. The second inverting output is connected to the first noninverting input, and the second noninverting output is connected to the first inverting input. A first feedback element 3608 is connected to the first noninverting input and the first inverting output. A second feedback element 3610 is connected to the first inverting input and the first noninverting output. A third feedback element 3614 is connected to the second inverting input and the second inverting output. A fourth feedback element 3616 is connected to the first noninverting input and the first noninverting output. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供具有高增益和宽带宽的跨阻放大器。 解决方案:差分跨阻放大器电路3600具有第一运算放大器3604,其包括第一反相输入,第一同相输入,第一反相输出和第一同相输出; 以及包括第二反相输入,第二同相输入,第二反相输出和第二同相输出的第二处理放大器3606。 第二反相输出连接到第一同相输入,第二反相输出连接到第一反相输入。 第一反馈元件3608连接到第一同相输入端和第一反相输出端。 第二反馈元件3610连接到第一反相输入端和第一同相输出端。 第三反馈元件3614连接到第二反相输入端和第二反相输出端。 第四反馈元件3616连接到第一同相输入和第一同相输出。 版权所有(C)2007,JPO&INPIT
    • 10. 发明专利
    • Switching amplifier
    • 开关放大器
    • JP2007180644A
    • 2007-07-12
    • JP2005373860
    • 2005-12-27
    • Sharp Corpシャープ株式会社
    • KISHIDA MASAHIRO
    • H03F1/30H03F3/217
    • H03F2200/331
    • PROBLEM TO BE SOLVED: To provide an inexpensive switching amplifier that is not affected by variations in the voltage of a power supply.
      SOLUTION: The switching amplifier includes: a delta-sigma modulation circuit 3 for converting an input signal S
      IN to produce a quantization signal S
      Q being a PDM signal or a PWM signal; a current amplifier section 11 with a constant current output for applying current amplification to the quantization signal S
      Q output from the delta-sigma modulation circuit 3; and a feedback section for feeding back a signal based on the output signal of the current amplifier section 11 to the delta-sigma modulation circuit 3.
      COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:提供不受电源电压变化影响的便宜的开关放大器。 解决方案:开关放大器包括:Δ-Σ调制电路3,用于转换输入信号S IN ,以产生作为PDM信号的量化信号S SB> /> PWM信号; 具有恒定电流输出的电流放大器部分11,用于向从Δ-Σ调制电路3输出的量化信号S SB SB施加电流放大; 以及反馈部分,用于将基于当前放大器部分11的输出信号的信号反馈到Δ-Σ调制电路3.版权所有:(C)2007,JPO&INPIT