High-frequency amplifier, high-frequency module, and mobile...

Details High-frequency amplifier, high-frequency module, and mobile... High-frequency amplifier, high-frequency module, and mobile...

2008-12-10

2010-11-23

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

C455S078000

Reexamination Certificate

active

07839217

ABSTRACT:
A high-frequency amplifier with high linearity is provided that is easy to integrate and is resistant to variations in transistor characteristics due to process variation. The high-frequency amplifier includes a bias circuit to bias an amplifying element that amplifies high frequencies. The bias circuit has a feedback circuit including a feedback loop in which a circuit with low pass characteristics and having a capacitor one end of which is grounded is inserted. A stable bias voltage is thus provided, which makes it possible to improve the linearity of the high-frequency amplifier.

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E. Taniguchi et al., “Dual Bias Feed SiGe HBT Low Noise Linear Amplifier”, The Institute of Electronics, Information and Communication Engineers, Technical Report of IEICE. MW2001-25, OPE2001-12 (Jun. 2001), pp. 1-5, 64, in Japanese with English translation.

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