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    • 4. 发明授权
    • Broad-band amplifier circuit and high-speed communication element using
the same
    • 宽带放大电路和高速通信元件使用相同
    • US5912590A
    • 1999-06-15
    • US770050
    • 1996-12-19
    • Naoki Miyano
    • Naoki Miyano
    • H03F3/08H03F3/189H04B10/116H04B10/556H04L27/02H03F3/191
    • H03F3/087
    • A broad-band amplifier circuit is furnished with a plurality of amplifiers with a coupling capacitor being interposed between every two adjacent amplifiers. Each coupling capacitor has a capacity large enough to prevent adverse effect of external noise. Accordingly, not only the passing of a signal having a low frequency is allowed, but also an element operable in a high frequency, such as a Schottky transistor, can be provided in each amplifier as a transistor. At least the transistor of the amplifier in the last stage is connected to a diode, so that the charges accumulated between its collector and base while the amplifier stays on are fed back and eliminated. Accordingly, the broad-band amplifier circuit can carry out a flat amplifying operation over a wide range from low to high frequency bands, and therefore, can be used for all the ASK method, IrDA1.0 method, and IrDA1.1 method. Consequently, not only the manufacturing cost, but also the size of the broad-band amplifier circuit can be reduced.
    • 宽带放大器电路配备有多个放大器,其中耦合电容器插入在每两个相邻的放大器之间。 每个耦合电容器具有足够大的容量以防止外部噪声的不利影响。 因此,不仅允许具有低频信号的通过,而且可以在每个放大器中提供诸如肖特基晶体管的高频元件作为晶体管。 至少在最后阶段的放大器的晶体管连接到二极管,使得在放大器保持导通时在其集电极和基极之间累积的电荷被反馈并消除。 因此,宽带放大电路可以在从低频到高频带的宽范围内进行平面放大操作,因此可以用于所有ASK方法,IrDA1.0方法和IrDA1.1方法。 因此,不仅可以降低制造成本,还可以减小宽带放大器电路的尺寸。