Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode
Patent
1994-09-08
1997-06-03
Saadat, Mahshid D.
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Having insulated electrode
257369, 257547, 327408, 341136, H01L 2976
Patent
active
056357451
ABSTRACT:
An input cell circuit for an integrated circuit for use in a mixed signal mode where an input pin may receive either digital or analog signals. The circuit solves the problem where several such pins are used in a mixed signal mode and share a common internal bus. Such input signals will cause erratic values on the common analog bus, if any given input pin is used as a digital input signal and the voltage on that input pin exceeds the supply voltage by the base-emitter voltage of the parasitic transistor in the P-channel transistor in a pass gate in the associated input cell. This problem is solved by adding a second P-channel transistor to the pass gate and also adding an N-channel transistor connected to a node between the two P-channel transistors, as well as adding an input resistor. The second N-channel transistor is on while the other three transistors are off and exhibits a drain/source on-resistance such that the lateral and vertical bipolar parasitic transistors formed by the second P-channel transistor will not turn on and there is no leakage current between the input of the cell and the output of the cell.
REFERENCES:
patent: 4876584 (1989-10-01), Taylor
patent: 4985703 (1991-01-01), Kaneyama
patent: 4998101 (1991-03-01), Trumpp et al.
patent: 5023688 (1991-06-01), Ando et al.
patent: 5276346 (1994-01-01), Iwai et al.
patent: 5336915 (1994-08-01), Fujita et al.
patent: 5389811 (1995-02-01), Poucher et al.
patent: 5506528 (1996-04-01), Cao et al.
Stanley Wolf, "Silicon Processing for the VLSI Era", vol. 2: Process Integration, Lattice Press, 1990, 9 pgs.
Bowers Courtney A.
Klivans Norman R.
National Semiconductor Corporation
Saadat Mahshid D.
LandOfFree
Analog multiplexer cell for mixed digital and analog signal inpu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Analog multiplexer cell for mixed digital and analog signal inpu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog multiplexer cell for mixed digital and analog signal inpu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-393378