Reduced area active above-ground and below-supply noise suppression circuits
a noise suppression circuit and reduced area technology, applied in the field of electronic circuits, can solve the problems of circuit operation errors, complex problems continue to rise to the forefront, and metallurgical limitations are continually raising the coupling effect of line-to-line interconnects
Inactive Publication Date: 2009-04-23
INT BUSINESS MASCH CORP
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AI Technical Summary
Benefits of technology
The patent describes a method and device for reducing noise in a circuit. It includes a device that detects noise, a device that suppresses the noise, and a control unit that activates or deactivates the noise suppression device based on changes in the signal. The technical effect of this invention is to improve the quality of signals by reducing noise, which can be useful in various applications such as electronics, sensors, and communication systems.
Problems solved by technology
As engineers seek ever increasing speeds in very large scale integration (VLSI) chips, complex problems continue to rise to the forefront.
For example, as process feature sizes continue to shrink, metallurgical limitations are continually raising line-to-line interconnect coupling effects.
Of these directions, two may cause errors in circuit operations.
Above-ground and below-supply signal noise can cause false switching events if the coupling effects causes the voltage level of a signal to cross the switching threshold of a given destination circuit.
Below-ground signal noise and above-supply signal noise can cause a loss of state in certain types of large circuits.
These circuits, however, require a significant area on the chip to include this type of circuit.
This increased use in area can be difficult in applications in which adding circuitry is costly or prohibited.
Method used
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[0016]With reference now to the figures and particularly with reference to FIG. 1, a diagram of a currently used above-ground noise cancellation circuit is depicted. Noise suppression circuit 100 contains inverters 102, 104, 106, 108, 110, 112, 114. Additionally, this circuit also contains NAND gate 116 along with transistors 118, 120, and 122. Each of the inverters in noise suppression circuit 100 requires two transistors to implement. NAND gate 116 includes three transistors. As a result, noise suppression circuit 100, in this example, requires twenty-one transistors to implement.
[0017]Adding twenty-one transistors to a chip requires additional area on the chip for noise suppression circuit 100. In some cases, this additional area may be considered significant, costly, or even prohibited.
[0018]Turning now to FIG. 2, a diagram illustrating a circuit system is depicted in accordance with an advantageous embodiment of the present invention. In this example, circuit system 200 contain...
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A method and apparatus for noise suppression. A circuit has a noise detection unit, a noise suppression unit, and a control unit. The noise suppression unit has an input and an output, wherein the input of the noise detection unit is connected to a signal and generates a signal change at the output if a change in the signal is detected. The noise suppression unit has an input and an output, wherein the input of the noise suppression unit is connected to the output of the noise detection unit and generates a correction to the signal in response to detecting the signal change at the output of the noise detection unit. The control unit has an input and an output, wherein input to the control unit is connected to the signal and turns off the noise suppression unit if a state change is detected in the signal.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to electronic circuits and in particular to electric noise suppression circuits.[0003]2. Description of the Related Art[0004]As engineers seek ever increasing speeds in very large scale integration (VLSI) chips, complex problems continue to rise to the forefront. For example, as process feature sizes continue to shrink, metallurgical limitations are continually raising line-to-line interconnect coupling effects. These effects lead to increased concern over signal noise and noise tolerance. Design engineers continually fight and solve problems relating to signal noise.[0005]Signal noise can take several forms. Due to coupling effects, signals can bounce in one or more of four distinct directions: above the ground, below the supply, below the ground, and above the supply. Of these directions, two may cause errors in circuit operations. Above-ground and below-supply signal noise can cause fals...
Claims
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IPC IPC(8): H03K17/16H03K19/003
CPCH03K19/00361
InventorDAGHER, RAFIKDURHAM, CHRISTOPHER M.KLIM, PETER J.
OwnerINT BUSINESS MASCH CORP