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2. 发明公开

EP1149466A1 AMPLIFIER 有权
标题翻译：放大器
公开(公告)号：EP1149466A1
公开(公告)日：2001-10-31
申请号：EP00969308.6
申请日：2000-09-25
申请人： Koninklijke Philips Electronics N.V.
发明人： VAN DE WESTERLO, Marcel, H., W.
IPC分类号： H03F1/22 , H03F3/26
CPC分类号： H03F1/226 , H03F3/265
摘要： The invention relates to an amplifier comprising a cascade circuit including an input circuit, a cascode circuit and an output circuit. The input circuit receives input signals via an input (10), which input signals are converted to amplified signals by the cascode circuit. These amplified signals are subsequently supplied to an output (94) by the output circuit. The cascode circuit comprises two input transistors (40 and 62) and an output transistor (74). By means of three capacitors (32, 46 and 50) and a coil (48), the cascode circuit is built up in such a way that the input transistors (40 and 62) are parallel-connected for comparatively high-frequency input signals, while the input transistors (40 and 62) are series-connected for comparatively low-frequency supply signals. This results in the transconductance being doubled, while the DC collector current or drain current remains the same. By doubling the transconductance, the contribution of the cascode circuit to the intermodulation distortion in the amplified signals is reduced substantially. As the DC collector current or drain current remains unchanged, the power dissipated in the amplifier remains substantially the same.
摘要翻译：本发明涉及一种包括级联电路的放大器，该级联电路包括输入电路，共源共栅电路和输出电路。输入电路通过输入端（10）接收输入信号，该输入信号被级联电路转换为放大信号。这些放大的信号随后由输出电路提供给输出端（94）。级联电路包括两个输入晶体管（40和62）和一个输出晶体管（74）。借助于三个电容器（32,46和50）以及线圈（48），共源共栅电路以这样的方式构建，即输入晶体管（40和62）并联连接以获得相对高频的输入信号，而输入晶体管（40和62）串联连接用于相对低频的电源信号。这导致跨导加倍，而直流集电极电流或漏极电流保持不变。通过使跨导加倍，共源共栅电路对放大信号中的互调失真的贡献大大降低。由于直流集电极电流或漏极电流保持不变，放大器的功耗基本保持不变。

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