Low noise amplifier and differential amplifier

Details Low noise amplifier and differential amplifier Low noise amplifier and differential amplifier

2008-07-31

2009-12-15

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including signal feedback means

C330S188000, C330S260000, C330S311000

Reexamination Certificate

active

07633344

ABSTRACT:
In a double-loop negative feedback low noise amplifier having double negative feedback paths by a feedback transformer and a feedback resistor added to a cascode amplifier comprising transistors and a resistor, a phase compensation circuit comprising a capacitor and a resistor is added between the output terminal of the double-loop negative feedback low noise amplifier and the input terminal of the cascode amplifier, i.e., the input terminal of the input transistor, and a phase compensation circuit comprising a capacitor and a resistor is added to the upper-stage transistor of the cascode amplifier, i.e., the input terminal of the upper-stage transistor. Those phase compensation circuits enable a low noise negative feedback amplifier which maintains a high feedback loop gain to a high frequency band, has a wider bandwidth than a conventional one, and has a high dynamic range.

REFERENCES:
patent: 6542037 (2003-04-01), Noll et al.
patent: 7339432 (2008-03-01), Yamaguchi
patent: 7501891 (2009-03-01), Yamaguchi
patent: 2003-289226 (2003-10-01), None
K. Van Hartingsveldt, M.H.L. Kouwenhoven, C.J.M. Verhoeven, and A.N. Burghartz, “HF Low Noise Amplifiers with Integrated Transformer Feedback”, ISCAS, May 2002, II815-II818, vol. 2.

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