Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1997-12-17
2000-06-20
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327318, 327320, H03K 508
Patent
active
060782048
ABSTRACT:
An external FET (12) has protection provided thereto for excessive voltages between the gate and drain and between the gate and source. A drain-to-gate clamp is provided with a plurality of series connected zener diodes (34), (36) and (38) which are connected in series with a Schottky diode (42). The current therethrough is sensed with a resistor (56) which turns on a bypass transistor (58) to shunt current around the zener diodes when an excess voltage causes them to break down. This will turn on the FET (12). The gate-to-source clamp is configured with two zener diodes (74) and (76) which are reversed biased. A series current sense resistor (82) senses the current through the diodes and turns on a transistor (84) when the current exceeds a predetermined level. This will effectively shunt current around the zener diodes (74) and (76).
REFERENCES:
patent: 5793245 (1998-08-01), Marshall et al.
patent: 5801573 (1998-09-01), Kelly et al.
patent: 5812006 (1998-09-01), Teggatz et al.
patent: 5828141 (1998-10-01), Foerster
Baldwin David
Cooper Chris
Frank Katherine
Brady W. James
Lam Tuan T.
Mosby April M.
Nguyen Hai L.
Texas Instruments Incorporated
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