Low-voltage pre-distortion circuit for linear-in-dB...

Details Low-voltage pre-distortion circuit for linear-in-dB... Low-voltage pre-distortion circuit for linear-in-dB...

2005-12-27

2005-12-27

Nguyen, Khanh V. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S256000, C330S289000

Reexamination Certificate

active

06980052

ABSTRACT:
Circuits and methods for a low voltage pre-distortion circuits that provide a temperature and logarithmically compensated voltage such that a gain change of a variable gain amplifier is linear in dB and has a reduced temperature dependency. A temperature compensation circuit multiplies the transfer function of gain of the amplifier versus gain control voltage by absolute temperature. A logarithmic compensation circuit removes the non-logarithmic factor of a “1” in the denominator of the transfer function.

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Shoji Otaka et al., “A Low-Power Low-Noise Accurate Linear-in-dB Variable-Gain Amplifier with 600-MHz Bandwidth”, IEEE Journal of Solid-State Circuits, vol. 95, No. 12, Dec. 2000.

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