Back to results
US 8,284,014 B2Granted
Digital potentiometer with independent control over both resistive arms
AssigneeAnalog Devices, Inc.
InventorKaushal Kumar Jha
Life of this patent
Estimating the term…
Abstract
A digital potentiometer includes a circuit containing multiple string arrays, each having a plurality of switching devices connected to an array of resistors. Each input terminal receives a separate digital input code enabling the resistance of one of the arms to be varied without changing the other.
Claims23
A digital potentiometer, comprising:
- a wiper terminal;
- a first terminal receiving a first digital input code, the first terminal being connected to the wiper terminal through at least one string array, wherein the first digital input code determines a resistance between the first terminal and the wiper terminal;
- and
- a second terminal receiving a second digital input code, the second terminal being connected to the wiper terminal through at least one additional string array, wherein the second digital input code determines a resistance between the second terminal and the wiper terminal;
- wherein the resistance between the first terminal and the wiper terminal and the resistance between the second terminal and the wiper terminal are determined independently of each other.
2 more elements
A method for independently controlling a first resistance of a first arm and a second resistance of a second arm of a digital potentiometer, the method comprising:
- receiving a first digital input code at a first terminal, the first digital input code turning on one of a plurality of switches in at least one string, a first resistance being set between the first terminal and a wiper terminal based on the turned on switches in the at least one string;
- and
- receiving a second digital input code at a second terminal, the second digital input code turning on one of a plurality of switches in at least one additional string, a second resistance being set between the second terminal and the wiper terminal based on the turned on switches in the at least one additional string;
- wherein the first resistance between the first terminal and the wiper terminal and the second resistance between the second terminal and the wiper terminal are set independently of each other.
1 more element
Dependencies are inferred from the claim text.