Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2007-09-25
2007-09-25
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S296000
Reexamination Certificate
active
11222400
ABSTRACT:
A dynamic bias circuit for an RF amplifier is provided to overcome the drawbacks of conventional bias circuits. The dynamic bias circuit of the present invention is best used for an RF amplifier having an FET amplifying transistor. It automatically raises the DC bias point as the input power increases. As a result, the saturation of output power in the pinch-off region can be avoided. This dynamic bias circuit not only improves the operating characteristics of the RF amplifier, such as high operating efficiency and high-linearity output power, but also consumes zero power in its internal circuitry. Furthermore, it has a simple circuit structure with very few circuit components and a reduced chip area. It can thus be easily integrated into an amplifier to achieve a cost reduction.
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Choe Henry
Industrial Technology Research Institute
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