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 die; a first transmitter circuit formed on the die and configured to be coupled to a first voltage to generate an electrical communication signal; an asynchronous electronic level shifter circuit on the die, the level shifter circuit including:
a first receiver circuit configured to be coupled to a second voltage, differing from said first voltage; anda capacitive coupling stage configured to operate in a first operating condition, during which the capacitive coupling stage is configured to receive said electrical communication signal and to supply a corresponding filtered signal to said first receiver circuit, said capacitive coupling stage including at least one capacitor formed by a pair of conductor elements comb-fingered with respect to one another, the first receiver circuit being physically spaced from the first transmitter circuit on the die by at least the capacitive coupling stage, the first receiver circuit including:
an electronic threshold device having an input terminal and an output terminal, the input terminal configured to receive a first intermediate signal and the output terminal being configured to output a second intermediate signal, the electronic threshold device being configured to switch the second intermediate signal on said output terminal between a first value and a second value based on transitions of the first intermediate signal through a threshold value; anda biasing circuit coupled to said capacitive coupling stage, to said input terminal of the electronic threshold device, and to said output terminal of the electronic threshold device, the biasing circuit configured to generate said first intermediate signal, the biasing circuit having a feedback signal that includes a D.C. component and a variable component, the variable component being based on the second intermediate signal.