Integrated circuits including coil circuit and SCR
An integrated circuit includes a T-coil circuit, a silicon-controlled rectifier (SCR), and a signal-loss prevention circuit. The T-coil circuit is coupled to an input/output (I/O) pad and an internal circuit. The SCR is coupled to the T-coil circuit and the internal circuit. The signal-loss prevention circuit is coupled to the T-coil circuit and the SCR. The signal-loss prevention circuit includes a resistor coupled to the T-coil circuit and the SCR. An electrostatic current flows through the resistor and turns on the SCR. The signal-loss prevention circuit may also include a diode circuit coupled to the T-coil circuit and the SCR. The diode circuit is configured to prevent signal loss.
1. An integrated circuit, comprising:
a T-coil circuit coupled to an input/output (I/O) pad and an internal circuit;
a silicon-controlled rectifier (SCR) coupled to the T-coil circuit and the internal circuit; and
a signal-loss prevention circuit coupled to the T-coil circuit and the SCR.
2. The integrated circuit of claim 1 , wherein the signal-loss prevention circuit comprises:
a resistor coupled to the T-coil circuit and the SCR,
wherein the resistor is configured to provide a current path for an electrostatic current to flow through and turn on the SCR when the electrostatic current occurs.
3. The integrated circuit of claim 1 , wherein the signal-loss prevention circuit comprises:
a diode circuit coupled to the T-coil circuit and the SCR, and configured to prevent signal loss.
4. The integrated circuit of claim 1 , further comprising:
a power-rail electrostatic discharge (ESD) clamp circuit coupled to a first power rail and a second power rail,
wherein the internal circuit is coupled to the first and second power rails.
5. The integrated circuit of claim 1 , further comprising:
an electrostatic discharge (ESD) circuit coupled to a node between the SCR and the internal circuit.
6. The integrated circuit of claim 5 , wherein the ESD circuit is configured to not turn on by a signal of a negative direct-current level.
7. The integrated circuit of claim 5 , wherein:
the integrated circuit is configured to operate in a negative-to-V SS (NS) mode; and
the ESD circuit is configured to turn on to discharge static electricity in the NS mode.
8. The integrated circuit of claim 5 , wherein the ESD circuit has a parasitic capacitance of twenty femtofarads.
9. The integrated circuit of claim 1 , wherein the SCR comprises:
a P+/Nwell/Pwell/N+ structure.
10. The integrated circuit of claim 1 , wherein:
the signal-loss prevention circuit comprises a diode circuit coupled to the T-coil circuit and the SCR; and
the integrated circuit further comprises a resistor coupled to the SCR and a power rail,
wherein the diode circuit and the resistor are configured to prevent signal loss at a radio frequency.
11. The integrated circuit of claim 10 , wherein:
the diode circuit has a parasitic capacitance of ten femtofarads; and
the resistor has a resistance of one hundred fifty ohms.
12. The integrated circuit of claim 1 , wherein the SCR comprises:
a two-finger SCR structure.
13. The integrated circuit of claim 1 , wherein the SCR has a length of forty micrometers and a width of sixteen micrometers.
14. The integrated circuit of claim 1 , wherein the SCR has a parasitic capacitance of thirty femtofarads.
15. The integrated circuit of claim 1 , wherein:
the integrated circuit is configured to operate in a positive-to-V SS (PS) mode;
the SCR is configured to turn on to discharge static electricity; and
a current of the T-coil circuit is configured to accelerate a turn-on speed of the SCR via the signal-loss prevention circuit.
16. The integrated circuit of claim 15 , wherein:
the signal-loss prevention circuit comprises a diode circuit coupled to the T-coil circuit and the SCR; and
the current of the T-coil circuit is configured to turn on the diode circuit.
17. The integrated circuit of claim 1 , wherein:
the integrated circuit is configured to operate in a positive-to-V DD (PD) mode; and
the SCR is configured to discharge static electricity via a diode path in the PD mode.
18. An integrated circuit, comprising:
a T-coil circuit coupled to an input/output (I/O) pad and an internal circuit;
a silicon-controlled rectifier (SCR) coupled to the T-coil circuit and the internal circuit; and
a trigger circuit coupled to the T-coil circuit and the SCR,
wherein the T-coil circuit is configured to trigger, via the trigger circuit, the SCR for discharging static electricity.
19. The integrated circuit of claim 18 , wherein the trigger circuit comprises:
a resistor coupled to the T-coil circuit and the SCR, wherein an electrostatic current flows through the resistor and turns on the SCR; and
a diode circuit coupled to the T-coil circuit and the SCR, and configured to prevent signal loss.
20. An integrated circuit, comprising:
a coil circuit coupled to an input/output (I/O) pad and an internal circuit, the coil circuit including an inductor;
a silicon-controlled rectifier (SCR) coupled to the coil circuit and the internal circuit; and
a diode circuit coupled to the coil circuit and the SCR,
wherein:
the inductor and the SCR are configured to provide a first current path for discharging from the I/O pad to a ground when an electrostatic current occurs; and
the diode circuit is configured to provide a second current path to accelerate a turn-on speed of the SCR.