Differential to single-ended conversion circuit and comparator using the circuit
AssigneeST-Ericsson SA
InventorsMarco Zamprogno, Pierangelo Confalonieri, Alberto Minuti
Life of this patent
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Abstract
An electrical circuit for conversion from differential to single-ended includes a differential amplifier stage and first and second buffer circuits. The differential amplifier stage includes a first and a second input; and a first and a different second charging circuit that can be operatively coupled, respectively, with an output of the conversion circuit and with an auxiliary output. Each of the first and second buffer circuits is functionally arranged between one of said outputs and between one of said charging circuits. The buffer circuits being configured so as to substantially equalize relative impedances seen towards said outputs.
Claims16
A differential to single conversion circuit, comprising:
- a primary output terminal and an auxiliary output terminal;
- first and second input terminals;
- a differential amplifier stage coupled between the input terminals and output terminals, and between first and second supply terminals;
- a first charging circuit having first and second charging switches coupled between the first and second supply terminals, the first and second charging switches being coupled to each other at a first intermediate node;
- a second charging circuit having third and fourth charging switches coupled between the first and second supply terminals, the third and fourth charging switches being coupled to each other at a second intermediate node, the fourth charging switch having a lower impedance than the second charging switch;
- a first buffer circuit coupled between the first and second supply terminals, the first buffer circuit including a first buffer switch coupled between the second supply terminal and the primary output terminal and having a control terminal coupled to the first intermediate node;
- a second buffer circuit coupled between the first and second supply terminals, the second buffer circuit including a second buffer switch coupled between the second supply terminal and the auxiliary output terminal and having a control terminal coupled to the second intermediate node;
- a first reset switch coupled between the first input terminal and the primary output terminal;
- and
- a second reset switch coupled between the second input terminal and the auxiliary output terminal.
Dependencies are inferred from the claim text.