IP Library › Granted Patent US 6,965,151
Granted Patent B2
US 6,965,151 · App. 10/393,533 · Granted Nov 15, 2005

Device including a resistive path to introduce an equivalent RC circuit

View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 6,965,151
App. No.
10/393,533
Granted
Nov 15, 2005
Kind
B2
Abstract

Structures for providing devices that include resistive paths specifically designed to provide a predetermined resistance between the bulk material of the device and a well tie contact. By providing a resistive path, an equivalent RC circuit is introduced to the device that allows the bulk material potential to track the gate potential, thereby advantageously lowering the threshold voltage as the device turns on and raising the threshold voltage as the device turns off. In addition, the introduction of the resistive path also allows the bulk material potential to be controlled and stabilize at an equilibrium potential between switching events.

Claims (14)

1. A device comprising:

a bulk material of a first conductivity type;

source and drain regions positioned within said bulk material and separated by a channel region, said source and drain regions having a second conductivity type;

a gate positioned over said channel region;

a resistive path in said bulk material, said resistive path being positioned in said bulk material so as to couple a first location in said bulk material, below said channel region, to a second location in said bulk material, said resistive path having a horizontal length;

wherein said horizontal length of said resistive path is chosen to provide a resistance between said first location and said second location within a specific range of resistance values; and

a well tie of said first conductivity type positioned within said bulk material, said well tie being positioned beside one of said source or drain regions and outside said channel region, wherein;

said well tie is electrically coupled to said second location in said bulk material.

2. The device of claim 1 , wherein;

said well tie is coupled to a first supply voltage and said source is coupled to a second supply voltage.

3. The device of claim 2 , wherein;

said device is characterized as having an on current and an off current and the ratio of on current to off current in said device is not greater than about 10 5 .

4. The device of claim 2 , wherein;

said device has an unbiased threshold voltage of between about −150 millivolts and +150 millivolts.