Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-08-15
2006-08-15
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S267000
Reexamination Certificate
active
07091787
ABSTRACT:
A transconductance amplifier generally limits its current output, and specifically decreases its current output as a function of temperature. The circuit is made up of an operational amplifier and two drive transistors that are connected to a first part of the amplifier circuit and a second part of the amplifier circuit respectively. The first part of the circuit is driven by positive input voltages, and the second part of the circuit is driven by negative input voltages. A transistor in each part of the circuit clamps a voltage, thereby limiting the current output. The negative temperature coefficient of the transistor also decreases the output current as the temperature of the circuit rises.
REFERENCES:
patent: 5696459 (1997-12-01), Neugebauer et al.
patent: 6903610 (2005-06-01), Aoki et al.
PCT International Search Report dated Feb. 22, 2006 of International Application No. PCT/US05/21875 filed Jun. 22, 2005.
BAE Systems Information and Electronic Systems Integration Inc.
Long Daniel J.
Pascal Robert
Wong Alan
Wurm Mark A.
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