Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-08-28
2007-08-28
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S254000
Reexamination Certificate
active
11166279
ABSTRACT:
A variable gain amplifier contains a plurality of differential transistor pairs. A temperature dependent current is generated in the current path of each differential transistor pair. A generated gain control current is converted to a temperature dependent gain control current and applied in circuit with control inputs of the transistors of the paired differential transistors. The temperature dependent gain control current is obtained from a gain control current corresponding to a desired gain which is then multiplying the control current by the temperature dependent current. The temperature dependent gain control current is modified to compensate for gain non-linearity by introducing an offset as a function of the gain control current.
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Analog Related Product AD8367, “500MHz, 45dB Linear-in-dB Variable Gain Amplifier,” with AGC Detector, released most likely in 2001.
Analog Related Product AD8362, “50Hz to 2.7GHz 60dB TruPwr Detector,” released in 2003.
Analog Related Product AD8361, “2.5GHz TruPwr Detector,” released most likely in 2001.
Linear Technology Corporation
McDermott Will & Emery LLP
Nguyen Patricia
LandOfFree
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