Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-03-28
1993-02-23
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307443, 307475, 307263, 36518901, H03F 345, G01R 1900, G11C 700
Patent
active
051893223
ABSTRACT:
A sense amplifier is provided for sensing an impedance between two lines. The impedance has two levels. The two lines are, in one embodiment, a product term line and a product term ground line of a programmable logic device. In the amplifier, a pull-up circuit connects one of the two lines to a high voltage (for example, V.sub.DD =5 volts), and a pull-down circuit connects the other line to a low voltage (for example, ground). A negative feedback circuit controls the pull-up and pull-down circuits in response to the voltage on one of the two lines so that the impedance of the pull-up circuit changes in direct relationship with respect to the voltage of that line, and the impedance of the pull-down circuit changes in an inverse relationship with respect to that voltage. The feedback circuit has a delay at least as long as the transition of that voltage between its two values, which values correspond to the two impedance levels. The delay permits to increase the transition speed in a power-efficient manner. The delay can be implemented by simple circuitry. The pull-down circuit includes, in some embodiments, two electrical paths structured so as to make the amplifier more tolerant to temperature and process variations.
REFERENCES:
patent: 4348601 (1982-09-01), Kitamura
patent: 4598389 (1986-07-01), Duvvury et al.
patent: 4728820 (1988-03-01), Lee
patent: 4728827 (1988-03-01), Woo
patent: 4880997 (1989-11-01), Steele
patent: 4972102 (1990-11-01), Reis et al.
patent: 4982363 (1991-01-01), Sood
Chan Melvin D.
Sharpe-Geisler Brad
Advanced Micro Devices , Inc.
Callahan Timothy P.
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