Clamp circuit device

Details Clamp circuit device Clamp circuit device

2007-07-24

2007-07-24

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S309000, C327S317000

Reexamination Certificate

active

11073564

ABSTRACT:
In a clamp circuit device, reference voltages are set up by a series circuit of an FET, a resistor and an FET. Gate potentials of FETs are set up by performing addition and subtraction of these reference voltages and a reference voltage generated by a bandgap reference circuit, respectively. The clamp circuit device is constructed by connecting together a source of the one FET with its drain connected with the power supply and a source of the other FET with its drain connected with the ground to an input terminal of a control IC unit. Thus, an input voltage is clamped to [V4+Vtp] when an excessive voltage of positive polarity is applied to an input terminal, and the input voltage is clamped to [V5−Vtn] when an excessive voltage of negative polarity is applied.

REFERENCES:
patent: 6653884 (2003-11-01), Fujii et al.
patent: 6714062 (2004-03-01), Kappes
patent: 6737905 (2004-05-01), Noda et al.

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