Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-07-01
1999-06-15
Lee, Benny T.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330149, 455126, H03F 345
Patent
active
059125888
ABSTRACT:
The invention relates to the gain control of radio amplifiers. In an amplifier circuit according to the invention, the employed output level is a differential pair provided with a tanh.sup.-1 predistorter as a control device. The predistortion is adjusted so that the differential pair operates all the time in the linear region, when the bias current I.sub.E and the transconductance of the pair are changed. By using the amplifier circuit according to the invention, there is achieved linear operation within a wide range of output power.
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IEEE Journal of Solid-State Circuits, vol. 26, No. 11, pp. 1673-1680, Nov. 1991, "A DC To 1-GHz Differential Monolithic Variable-Gain Amplifier", Meyer et al.
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Lee Benny T.
Nguyen Khanh Van
Nokia Mobile Phones Ltd.
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