Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1995-06-22
1997-05-06
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
326 21, 326 62, 323315, H03L 500
Patent
active
056274890
ABSTRACT:
A level shifter for shifting a digital signal input voltage to a digital signal output voltage and for rejecting voltage variations in the level shifter that would cause the level shifter to shift in error. The level shifter includes a trigger for triggering a pulse at each transition of the digital signal between an input supply voltage and an input reference voltage, a latch for switching the digital signal to one of an output supply voltage and an output reference voltage in response to each pulse from the driver and holding the digital signal at that voltage, and two half-shifters connected between the trigger and the latch for providing the pulse to said latch when the digital signal transitions. Each of the half-shifters include a selector circuit with series-connected current mirrors connected to a current source for providing a current to the current mirrors responsive to receipt of the pulse. The current mirrors include components for reducing capacitances in the selector circuit and discharging stored charges at transistor junctions that induce voltage variations that would cause the latch to switch other than in response to the pulse if the voltage variations were provided to the latch. The level shifter may include a circuit for correcting an incorrect latch position.
REFERENCES:
patent: 4767946 (1988-08-01), Taylor
patent: 4792704 (1988-12-01), Lobb et al.
patent: 5459427 (1995-10-01), Chambers et al.
Callahan Timothy P.
Harris Corp.
Wells Kenneth B.
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