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    • 7. 发明申请
    • HIGH-FREQUENCY AMPLIFIER
    • 高频放大器
    • WO02054585A1
    • 2002-07-11
    • PCT/JP2001/010993
    • 2001-12-14
    • H01P1/00H01P1/20H01P1/212H03F3/60H03H7/01H04B1/04H03F3/189
    • H03F3/60H01P1/2007H03H7/0123H03H7/1758H03H7/1766H03H7/1791H03H7/46
    • A bias circuit applicable to a high-frequency amplifier used in a communication device such as a portable telephone and adapted for reducing the harmonic distortion with a simple structure. A high-frequency amplifier of high-efficiency and small current consumption in which the voltage drop caused at the bias circuit is reduced is also disclosed. The high-frequency amplifier is composed of an amplifier circuit, an output-side matching circuit, and a bias circuit. In this bias circuit, one end of a parallel circuit composed of a first transmission line and a first capacitor is connected between the amplifier circuit and the output-side matching circuit. The other end of the parallel circuit is connected to a power supply and grounded through a second capacitor. Thus, the bias circuit is kept open in a frequency band of the signal amplified by the amplifier circuit and short-circuited in a desired frequency band, thereby reducing the high-frequency distortion without using any low-pass filter.
    • 一种偏置电路,适用于在诸如便携式电话的通信设备中使用的高频放大器,并且适于以简单的结构减少谐波失真。 还公开了在偏置电路处引起的电压降降低的高效率和小电流消耗的高频放大器。 高频放大器由放大电路,输出侧匹配电路和偏置电路构成。 在该偏置电路中,由放大电路和输出侧匹配电路连接由第一传输线和第一电容构成的并联电路的一端。 并联电路的另一端连接到电源并通过第二电容器接地。 因此,偏置电路在由放大器电路放大的信号的频带中保持断开,并且在期望的频带中短路,从而在不使用任何低通滤波器的情况下降低高频失真。