Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Signal level or switching threshold stabilization
Patent
1997-11-06
2000-03-07
Tokar, Michael
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Signal level or switching threshold stabilization
326 34, 326 80, 326 82, H03K 19003, H03K 1716
Patent
active
060345373
ABSTRACT:
A driver circuit has first and second output drivers, monitor circuitry for deriving control signals related to driven signal levels, and supply circuitry responsive to the control signals for controlling the supply voltage to the output drivers. The monitor circuitry can be connected to monitor the voltage at the supply inputs of the output drivers for deriving the control signals. Alternatively, the monitor circuitry can be connected directly to monitor driven output levels from the drivers. In the latter case, the output levels to be monitored are rectified. The monitor circuitry can comprise first and second operational amplifiers for comparing a monitored voltage from first and second output drivers, respectively, to a first and second reference voltages, respectively. The supply circuitry can comprise first and second constant current sources, for example field effect transistors.
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Burrows David Frank
Hunt Kenneth Stephen
Chang Daniel D.
LSI Logic Corporation
Tokar Michael
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