H - Electricity – 04 – B
Patent
H - Electricity
04
B
328/186
H04B 15/00 (2006.01) H03K 19/003 (2006.01)
Patent
CA 2012671
ANTI-NOISE CIRCUITS Abstract Low noise circuits for single stage and multi-stage circuits reduce power rail noise, including both ground noise and supply noise caused by output power rail ground lead and supply lead inductance. Anti-bounce circuits reduce ground bounce by suppressing turn on of the output stage pulldown transistor element during transient occurrence of ground bounce events. Similarly anti-droop circuits reduce output supply Vcc droop by suppressing turn on of the output stage pulldown transistor element during transient occurrence of Vcc droop events. Anti-undershoot circuits dissipate ground undershoot energy by establishing a transient sacrificial current flow through the parasitic output ground tank circuit following transition from high to low potential at the output and by prolonging the sacrificial current flow during transient occurrence of ground undershoot events. Similarly anti-overshoot circuits dissipate overshoot energy in the parasitic output supply tank circuit by establishing a sacrificial current flow during transient occurrence of Vcc overshoot events. Ground noise and power noise detectors are used for detecting occurrence of bounce, droop, undershoot and overshoot for actuating and enhancing operation of the low noise circuits. The power rail noise detectors and anti- noise circuits are combined in various combinations and permutations.
National Semiconductor Corporation
Rogers Alan C.
Smart & Biggar
LandOfFree
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