Floating body contact circuit method for improving ESD performance and switching speed
Embodiments of systems, methods, and apparatus for improving ESD performance and switching time for semiconductor devices including metal-oxide-semiconductor (MOS) field effect transistors (FETs), and particularly to MOSFETs fabricated on Semiconductor-On-Insulator (“SOI”) and Silicon-On-Sapphire (“SOS”) substrates.
1. An electronic circuit including:
(a) at least one field effect transistor (FET), each FET including:
(1) a gate, a drain, a source, and a body;
(2) a gate resistor series connected to the gate of such FET;
(3) an accumulated charge sink (ACS) diode circuit connected to the body of such FET; and
(4) an ACS resistance series connected to the ACS diode circuit, wherein the series-connected ACS resistance and the ACS diode circuit are connected to the gate resistor of such FET at a node opposite to the connection of the gate resistor to the gate, and the ACS resistance is sized to provide substantial ESD tolerance without substantially impairing the function of the ACS diode circuit; and
(b) at least one electrostatic discharge (ESD) protection electronic circuit, each ESD protection electronic circuit including:
(1) a selectable resistor coupled in series between a common control terminal for at least one FET and the gate resistor of at least one FET; and
(2) a bypass module coupled in parallel with the selectable resistor and having a control signal input for receiving a control signal, the bypass module being configured to respond to the control signal to (A) in a bypass mode, conduct signals applied to the coupled common control terminal through the bypass module and around the selectable resistor, and (B) in a protection mode, cause signals applied to the coupled common control terminal to be conducted through the selectable resistor, wherein in the bypass mode, the bypass module presents no significant added resistance, relative to the gate resistor of the at least one coupled FET, to signals applied to the coupled common control terminal.
2. The invention of claim 1 , wherein the resistance of the ACS resistance has at least 10 times the resistance of the gate resistor.
3. The invention of claim 1 , wherein the bypass module includes a bypass FET having a gate, a drain, a source, and a gate resistor series connected to the gate of the bypass FET, wherein the source and drain of the bypass FET are coupled across the selectable resistor, and the gate resistor of the bypass FET is coupled to the control signal input.
4. The invention of claim 1 , wherein the selectable resistor has twice or more resistance than the gate resistors.
5. The invention of claim 1 , wherein the protection mode persists when no electrical power is applied to the electronic circuit.
6. An integrated circuit including:
(a) a plurality of stacked field effect transistors (FET), each FET including:
(1) a gate, a drain, a source, and a body; and
(2) a gate resistor series connected to the gate of such FET;
wherein at least one stacked FET includes an accumulated charge sink (ACS) diode circuit connected to the body of such FET, and an ACS resistance series connected to the ACS diode circuit, wherein the series-connected ACS resistance and the ACS diode circuit are connected to the gate resistor of such FET at a node opposite to the connection of the gate resistor to the gate; and
(b) an electrostatic discharge (ESD) protection electronic circuit including:
(1) a selectable resistor coupled in series between a common control terminal for the plurality of FETs and the gate resistors of the plurality of FETs; and
(2) a bypass module coupled in parallel with the selectable resistor and having a control signal input for receiving a control signal, the bypass module being configured to respond to the control signal to (A) in a bypass mode, conduct signals applied to the coupled common control terminal through the bypass module and around the selectable resistor, and (B) in a protection mode, cause signals applied to the coupled common control terminal to be conducted through the selectable resistor, wherein in the bypass mode, the bypass module presents no significant added resistance, relative to the gate resistor of the plurality of FETs, to signals applied to the coupled common control terminal.
7. The invention of claim 6 , wherein the ACS resistance is sized to provide substantial ESD tolerance without substantially impairing the function of the ACS diode circuit.
8. The invention of claim 6 , wherein the bypass module includes a bypass FET having a gate, a drain, a source, and a gate resistor series connected to the gate of the bypass FET, wherein the source and drain of the bypass FET are coupled across the selectable resistor, and the gate resistor of the bypass FET is coupled to the control signal input.
9. The invention of claim 6 , wherein the selectable resistor has twice or more resistance than the gate resistors.
10. The invention of claim 6 , wherein the protection mode persists when no electrical power is applied to the integrated circuit.
11. An integrated circuit including:
(a) a plurality of stacked field effect transistors (FET), each FET including:
(1) a gate, a drain, a source, and a body; and
(2) a gate resistor series connected to the gate of such FET; and
(b) a plurality of electrostatic discharge (ESD) protection electronic circuits, each ESD protection electronic circuit corresponding to one of the plurality of FETs and each including:
(1) a selectable resistor coupled in series between a common control terminal for the corresponding one of the plurality of FETs and the gate resistor of the corresponding one of the plurality of FETs; and
(2) a bypass module coupled in parallel with the selectable resistor and having a control signal input for receiving a control signal, the bypass module being configured to respond to the control signal to (A) in a bypass mode, conduct signals applied to the coupled common control terminal through the bypass module and around the selectable resistor, and (B) in a protection mode, cause signals applied to the coupled common control terminal to be conducted through the selectable resistor, wherein in the bypass mode, the bypass module presents no significant added resistance, relative to the gate resistor of the corresponding one of the plurality of FETs, to signals applied to the coupled common control terminal.
12. The invention of claim 11 , wherein at least one stacked FET includes an accumulated charge sink (ACS) circuit.
13. The invention of claim 11 , wherein the bypass module includes a bypass FET having a gate, a drain, a source, and a gate resistor series connected to the gate of the bypass FET, wherein the source and drain of the bypass FET are coupled across the selectable resistor, and the gate resistor of the bypass FET is coupled to the control signal input.
14. The invention of claim 11 , wherein the selectable resistor has twice or more resistance than the gate resistors.
15. The invention of claim 11 , wherein the protection mode persists when no electrical power is applied to the integrated circuit.