Semiconductor device

Details Semiconductor device Semiconductor device

2009-03-16

2010-12-21

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S279000, C330S296000

Reexamination Certificate

active

07855601

ABSTRACT:
A semiconductor device including: a gain control circuit; a first circuit which is controlled a gain to be constant by the gain control circuit; and a bias circuit connected to the first circuit, wherein the first circuit including a first transistor; and a load resistance, an amplification factor or an attenuation factor of the first circuit is proportionate to a product of a transconductance of the first transistor and a resistance value of the load resistance, and a voltage applied to the load resistance is set as an output of the semiconductor device, the bias circuit generates and outputs a differential current of a current that is proportionate to a drain current flowing into the first transistor and a current that is inversely proportionate to the load resistance value, and an output of the bias circuit is connected to an output node of the first circuit.

REFERENCES:
patent: 6144233 (2000-11-01), Maruyama et al.
patent: 6252458 (2001-06-01), Shibata
patent: 7629853 (2009-12-01), Oishi
patent: 2007/0038912 (2007-02-01), Hashimoto et al.
patent: 2000-174568 (2000-06-01), None
patent: 2000-269757 (2000-09-01), None
patent: 2000-278053 (2000-10-01), None

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