Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-10-17
2006-10-17
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S258000
Reexamination Certificate
active
07123092
ABSTRACT:
A differential amplifier includes a pair of first and second transistors connected together. The first transistor includes a first conduction terminal, and a second conduction terminal forming a first output node of the amplifier. The second transistor includes a first conduction terminal connected to the first conduction terminal of the first transistor, and a second conduction terminal forming a second output node of the amplifier. A first inductive load is connected between the first output node and a supply reference, and a second inductive load is connected between the second output node and the supply reference. A limiting network limits output voltages on the first and second output nodes, and includes a first resistor connected to the first output node, and a second resistor connected to the second output node. The first and second resistors also connected together in series at a common intermediate node. A first analog switch is connected to the first resistor and to the supply reference, and a second analog switch connected to the second resistor and the supply reference via the first analog switch. The first and second analog switches are turned on when a voltage on the common intermediate node exceeds a threshold.
REFERENCES:
patent: 4904953 (1990-02-01), McCormack
patent: 5221909 (1993-06-01), Cole
Nguyen Khanh Van
STMicroelectronics SA
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