Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2005-01-11
2005-01-11
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S080000, C327S081000
Reexamination Certificate
active
06842051
ABSTRACT:
Within one embodiment, a voltage detector circuit detects whether a voltage supply (e.g., VDD) is in a high or low range and generates a logic output. Using this logic output, a variable RC (resistor capacitor) VDDfilter may be implemented such that at high VDDthe amount of resistance is increased, thereby increasing the decoupling on the VDDline and reducing the size of current spikes on VDD. This is particularly useful in circuits that function over a wide range of VDDsupply. The voltage detector circuit can also be used in other embodiments as well. For example, the voltage detector circuit may be used to change the drive strength (e.g., effective W/L) of an output driver such that more drive is provided at low VDDand less at high VDDthereby having the effect of reducing rise/fall time variation and reducing the size of current spikes at high VDD.
REFERENCES:
patent: 6297683 (2001-10-01), Drapkin et al.
patent: 6577166 (2003-06-01), Lim
patent: 6628152 (2003-09-01), Kern et al.
patent: 6636089 (2003-10-01), Majcherczak et al.
NaTIONAL Semiconductor Corporation
Wells Kenneth B.
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