Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2006-07-18
2006-07-18
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S288000
Reexamination Certificate
active
07078974
ABSTRACT:
A module including a bias circuit that generates gate bias voltages by resistance dividers creates a problem in that the values of the resistances constituting the bias circuit must be finely adjusted, and accordingly extra trimming tasks are required. The present invention provides current generators that generate currents varying with desired characteristics responsive to a control voltage, independent of variations in transistor threshold voltages, connects output resistors to parallel transistors in respective stages to form current mirror circuits, and supplies currents from the current generators thereto to drive them, instead of supplying dividing voltages.
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Furuya Tomio
Matsudaira Nobuhiro
Matsushita Kouichi
Morisawa Fuminori
Tsutsui Takayuki
Choe Henry
Hitachi Communication Systems, Inc.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Renesas Technology Corp.
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