Digital signal translator having compensation for P-channel and

Details Digital signal translator having compensation for P-channel and Digital signal translator having compensation for P-channel and

1989-03-21

1990-07-17

Shoop, Jr., William M.

Coded data generation or conversion

Converter compensation

307443, 307475, H03M 504

Patent

active

049423983

ABSTRACT:
A digital translator, on a semiconductor chip that contains N-channel transistors and P-channel transistors which have threshold voltages that vary about respective nominal values, includes an input/output module which is made of the transistors and which receives a digital input signal at two voltage levels and in response generates a digital output signal at two different voltage levels. To compensate for the threshold variations and thereby stabilize the voltage levels of the output signal, the translator also includes a voltage generator which produces a reference voltage for the input/output module. This generator is made of the N-channel transistors and the P-channel transistors, and it varies the reference voltage in proportion to the threshold voltage of the N-channel transistors regardless of how the threshold voltage of the P-channel transistors varies; and, the input/output module includes one of the N-channel transistors which receives the reference voltage and produces the output signal by conducting in proportion to the reference voltage only when the input signal is at one of its two voltage levels.

REFERENCES:
patent: 4656372 (1987-04-01), Sani et al.
patent: 4849660 (1989-07-01), Hayashi et al.

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