CAPACITIVE COUPLING, ASYNCHRONOUS ELECTRONIC LEVEL SHIFTER CIRCUIT

摘要

An asynchronous level shifter electronic circuit including: a transmitter, which can be coupled to a first voltage and generates a communication signal; a receiver, which can be coupled to a second voltage; and a capacitive coupling stage, which receives the communication signal and supplies a corresponding filtered signal to the receiver. The receiver includes: a threshold device, which has an input terminal and an output terminal and switches an electrical quantity on the output terminal between a first value and a second value, as a function of corresponding transitions through a threshold of a first intermediate signal present on the input terminal, to generate a second intermediate signal; and a biasing circuit, which generates the first intermediate signal to have a d.c. component, which is a function of the second intermediate signal, and superposed on which is a variable component, which is a function of the filtered signal.

主权项

1. A device, comprising:
a substrate having a first well and a second well; an asynchronous electronic level shifter circuit that includes:
a first transmitter circuit configured to be coupled to a first voltage and to generate a first electrical communication signal, the first transmitter circuit being in the first well;a second transmitter circuit configured to be coupled to a second voltage, that is different from the first voltage, and to generate a second electrical communication signal, the second transmitter circuit being in the second well;a first receiver circuit configured to be coupled to the second voltage, the first receiver circuit being in the second well; anda second receiver circuit configured to be coupled to the first voltage, the second receiver circuit being in the first well;a capacitive coupling stage configured to operate in a first operating condition, during which the capacitive coupling stage is configured to receive the first electrical communication signal and to supply a first filtered signal to said first receiver circuit, and the capacitive coupling stage is configured to operate in a second operating condition, during which the capacitive coupling stage is configured to receive the second electrical communication signal and to supply a second filtered signal to said second receiver circuit.