Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-02-26
1990-08-07
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307246, 307270, 307443, 307491, 307542, H03K 426, H03K 501, H03K 1716
Patent
active
049470639
ABSTRACT:
The transient noise generated at the output drivers of an integrated circuit chip is reduced by maintaining an increasing ramp shaped current through each output driver during the entire transition interval between binary states of a capacitive load. A capacitor fed by a fixed current source is connected across the input of each output driver stage. The fixed current source and capacitor are so selected as to generate across the input of each output driver stage a linear ramp shaped control voltage that regulates the charging/discharging current through the output driver stage and package inductance in the described manner. A specially designed bias circuit reduces the sensitivity of the resulting transient noise to process variations and operating conditions. A feedback connection from the package inductance to the bias control circuit for the fixed current source adjusts the fixed current inversely with the transient noise. A dynamic clamp suppresses voltage spikes extending outside the voltage supply operating range. A bias circuit arrangement compensates for sheet resistivity of the integrated circuit chip. If the resistance value of the sheet drops below a prescribed value, the fixed current is limited so it cannot exceed its designed value.
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Chung David K.
Hull Richard W.
O'Shaughnessy Timothy G.
Ouyang Kenneth W.
Pierotti Victor G.
Western Digital Corporation
Zazworsky John
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