Circuit for protecting an integrated circuit against elctrostatic discharges in CMOS technology
View Patent ↗The integrated circuit may include at least one electronic protection circuit for protecting against at least one electrostatic discharge and being able to discharge the overvoltage current generated by the electrostatic discharge. The electronic protection circuit includes a controlled short-circuiting switch embodied in CMOS technology including a CMOS technology TRIAC or a CMOS technology thyristor arranged in anti-parallel with a CMOS technology diode, and a triggering circuit for controlling the short-circuiting switch.
1. An integrated circuit (IC) comprising:
at least one electrostatic discharge protection circuit comprising
at least one complementary metal-oxide-semiconductor (CMOS) short-circuit switch including a CMOS triode for alternating current (TRIAC), and
a triggering circuit for controlling said at least one CMOS short-circuit switch;
said CMOS TRIAC comprising
an isolating region of a first conductivity type,
a first well of a second conductivity type and being positioned in said isolating region, and
a second well of the second conductivity type and also being positioned in said isolating region,
said isolating region defining a separating portion between said first and second wells.
2. The IC according to claim 1 wherein said first and second wells each comprise a first active zone doped according to the second conductivity type and a second active zone doped according to the first conductivity type; and wherein the separating portion comprises a third active zone doped according to the first conductivity type.
3. The IC according to claim 2 wherein said CMOS TRIAC comprises:
a first connection being coupled both to said first active zone and to said second active zone of said first well of the second conductivity type;
a second connection being coupled both to said first active zone and to said second active zone of said second well of the second conductivity type; and
a third connection being coupled to the isolating region via the third active zone of the separating portion.
4. A method of operating an electrostatic discharge protection circuit on an integrated circuit (IC), the method comprising:
providing at least one complementary metal-oxide-semiconductor (CMOS) short-circuit switch including a CMOS triode for alternating current (TRIAC); and
controlling the at least one CMOS short-circuit switch with a triggering circuit, the CMOS TRIAC comprising
an isolating region of a first conductivity type,
a first well of a second conductivity type and being positioned in the isolating region, and
a second well of the second conductivity type and also being positioned in the isolating region,
the isolating region defining a separating portion between the first and second wells.
5. The method according to claim 4 further comprising:
coupling a first connection to the first active zone and to the second active zone of the first well of the second conductivity type;
coupling a second connection to both the first active zone and to the second active zone of the second well of the second conductivity type; and
coupling a third connection to the isolating region via the third active zone of the separating portion.