Back to results
US 8,410,965 B2Granted
Dynamic element matching method and system thereof
AssigneeMStar Semiconductor, Inc.
InventorsJung-Kuei Chang, Huang-Hsiang Lin
Life of this patent
Estimating the term…
Abstract
A dynamic element matching method and system thereof is provided. The method includes grouping a plurality of switches into a plurality of groups; allocating a plurality of to-be-turned-on switches of the switches for an input signal to the groups; and maintaining a switch activity of each of the groups at a predetermined value. Accordingly, mismatch noise and harmonic noise are effectively reduced.
Claims18
A dynamic element matching (DEM) method, comprising:
- grouping a plurality of switches into a plurality of groups;
- allocating a plurality of to-be-turned-on switches among the switches for an input signal to the groups;
- and
- maintaining a switch activity for each group including:
- recording a switch history for each switch by a plurality of weightings;
- sorting the weightings;
- and
- determining a plurality of statuses for the switches according to the sorted weightings.
5 more elements
A dynamic element matching (DEM) system, comprising:
- a plurality of switches associated with a plurality of groups;
- an allocating apparatus, for allocating a plurality of to-be-turned-on switches among the switches for an input signal to the groups;
- and
- a plurality of switch activity control devices, coupled to the allocating apparatus, for maintaining a switch activity for each group, wherein each activity control device comprises:
- a counter, for counting a plurality of count values for a plurality of weightings for the switches, respectively;
- an on-to-off quantity generator, for generating a switch number for to-be-turned-off switches according to outputs of the allocating apparatus and the switch activity;
- an off-to-on quantity generator, for generating a switch number for to-be-turned-on switches according to outputs of the allocating apparatus and the switch activity;
- an on-to-off decider, for determining which switches need to be turned off according to the switch number of the to-be-turned-off switches and a previous output signal of the activity control device;
- an off-to-on decider, for determining which switches need to be turned on according to the switch number of the to-be-turned-on switches and the previous output signal of the activity control device;
- and
- a logical circuit, coupled to the on-to-off decider and the off-to-on decider, for generating an output signal of the activity control device to turn on or turn off the switches.
8 more elements
Dependencies are inferred from the claim text.