Analog multiplexer cell for mixed digital and analog signal inpu

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode

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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:
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patent: 4998101 (1991-03-01), Trumpp et al.
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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.

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