Modulator

Details Modulator Modulator

2008-01-15

2008-01-15

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07319360

ABSTRACT:
The present invention describes a modulator including a differential amplifier connected to a reference voltage and a first transistor, and the first transistor is connected to a feedback device, and a second transistor is set between the first transistor and the differential amplifier and connected to a voltage detector and a diode, and the diode is connected to a power supply, and the voltage detector keeps on detecting an output voltage (VOUT) between the feedback device and the first transistor. If the output voltage (VOUT) value is lower than a predetermined voltage value of the power supply, the voltage detector will issue a signal to drive the second transistor and limit a gate-source voltage (VGS) of the first transistor within a voltage difference of the diode, so as to reduce the impetus of the first transistor and avoid the phenomenon of a sudden climb with an excessively large output voltage (VOUT).

REFERENCES:
patent: 5689460 (1997-11-01), Ooishi
patent: 5945819 (1999-08-01), Ursino et al.
patent: 6529563 (2003-03-01), Mosinskis et al.
patent: 2003/0090251 (2003-05-01), Nakashimo

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