Patent · US Active

Piecewise linear digital-to-analog converter circuit

US12388455B2 · kind B2 · utility

0Cited by

24References

20Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Nicola Rasera · Munich, DE
Cristian Grecu · Munich, DE
Bogdan-Eugen Matei · Westerndorf, DE
Fabio Ongaro · Munich, DE
Ming SUN · Santa Clara, US

Key dates

Filing date	Jun 21, 2023
Grant date	Aug 12, 2025
Priority date	—
Expiry date	Nov 15, 2043

Classification

Technology area (CPC H)Electricity
CPC primaryH03M1/742
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A piecewise linear current-mode digital-to-analog converter circuit approximates an exponential output current over a range of input codes by generating linearly varying currents with different slopes of different ranges of the input codes. The piecewise linear current-mode digital-to-analog converter circuit includes a current generator circuit that generates the output current based on a reference voltage and a feedback signal. A variable resistance circuit is used to generate the feedback signal using the output current. Respective values of the reference voltage and the variable resistance circuit vary as a function of the input code.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.