Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-11-15
2005-11-15
Jeanpierre, Peguy (Department: 2819)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000, C330S258000, C330S301000, C360S067000, C360S068000
Reexamination Certificate
active
06965266
ABSTRACT:
A high voltage differential amplifier including an input differential pair of low voltage transistors, a sense differential pair of low voltage transistors, first and second high voltage transistors, a low voltage bias transistor, a cascaded pair of low voltage transistors, and an output pair of high voltage transistors. The sense differential pair has a pair of control terminals that detect a common mode voltage of the differential input signal, and establishes a sense node which follows the common mode voltage. The first high voltage device is coupled to the sense node to establish bias node voltage levels which track the common mode voltage, including an output bias node biasing the output pair and a cascade bias node biasing the cascaded pair. In this manner, the terminals of the low voltage devices slide up or down with the common mode voltage and are protected from high voltage levels.
REFERENCES:
patent: 4766394 (1988-08-01), Yukawa
patent: 5294892 (1994-03-01), Ryat
patent: 5343164 (1994-08-01), Holmdahl
patent: 6181203 (2001-01-01), Newlin
Intersil America's Inc.
Jeanpierre Peguy
Nguyen Khai M.
Stanford Gary R.
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