Digital logic devices with extremely skewed trip points and reset circuitry for rapidly propagating signal edges
First Claim
1. A skewed NOR rising logic device for rapidly propagating a rising edge of an output signal, comprising:
- a fast NOR gate rising having a large p/n channel width ratio for receiving a first input signal and a second input signal and rapidly propagating a rising edge of said output signal in response to a falling edge on both of said first input signal and said second input signal;
a pull-down reset network connected in parallel with said fast NOR gate rising for resetting said output signal after said rising edge of said output signal has been propagated; and
a feedback delay circuit connected in parallel with said pull-down reset network for delaying and returning said output signal back to an input of said pull-down reset network.
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Abstract
The invention includes digital logic devices with extremely skewed trip points and reset circuitry for rapidly propagating signal edges. Embodiments of skewed logic devices in accordance with the present invention include inverters, buffers, NOR gates and NAND gates for rapidly propagating a selected “fast” edge of an input signal. Additional embodiments include pulse stretchers, memory devices, substrates, computer systems and methods incorporating the skewed logic devices of the present invention. Each embodiment of a skewed logic device of the present invention is configured to propagate either a fast rising edge or fast falling edge of an output signal, i.e., the “fast” edge, at rates comparable to those of domino logic. An advantage of the skewed logic devices of the present invention over conventional CMOS logic devices is rapid edge propagation. Additionally, virtually all of the input gate loading is devoted to the fast edge being propagated. Additionally, the reset networks, as disclosed herein, are buffered by at least two gates, thus reducing loading seen by the input or the output of the skewed logic device.
39 Citations
12 Claims
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1. A skewed NOR rising logic device for rapidly propagating a rising edge of an output signal, comprising:
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a fast NOR gate rising having a large p/n channel width ratio for receiving a first input signal and a second input signal and rapidly propagating a rising edge of said output signal in response to a falling edge on both of said first input signal and said second input signal;
a pull-down reset network connected in parallel with said fast NOR gate rising for resetting said output signal after said rising edge of said output signal has been propagated; and
a feedback delay circuit connected in parallel with said pull-down reset network for delaying and returning said output signal back to an input of said pull-down reset network. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A skewed NAND rising logic device for rapidly propagating a rising edge of an output signal, comprising:
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a fast NAND gate rising having a large p/n channel width ratio for receiving both a first input signal and a second input signal and rapidly propagating a rising edge of said output signal in response to falling edges on either said first input signal or said second input signal;
a pull-down reset network connected in parallel with said fast NAND gate rising for resetting said output signal after said rising edge of said output signal has been propagated; and
a feedback delay circuit connected in parallel with said pull-down reset network for delaying and returning said output signal to an input of said pull-down reset network. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification