Title:
DIGITAL TO ANALOG CONVERTER
Document Type and Number:
WIPO Patent Application WO/2020/020092
Kind Code:
A1
Abstract:
A digital to analog converter (300) comprises: a first resistor string (310), comprising multiple first resistors connected between a reference voltage and a reference ground; a second resistor string (340), comprising multiple second resistors connected between a first input end (26) and a second input end (28); a first switch network (320), for selecting at least one first resistor from the first resistor string (310) according to a first valid bit of an input digital signal; and a second switch network (350), for selecting at least one second resistor from the second resistor string (340) according to a second valid bit of the input digital signal. The digital to analog converter (300) also comprises a third switch network (330) that provides a current path from the first switch network (320) to the second resistor string (340). When switching is performed on the first resistor string (310), voltages across the resistors of the second resistor string (340) change uniformly, and the degree of matching is greatly improved, thereby eliminating the case in which an output analog signal difference between adjacent codes has a strong correlation with an absolute code, affecting the accuracy of digital to analog conversion.
Inventors:
LIU JING (CN)
Application Number:
PCT/CN2019/097020
Publication Date:
January 30, 2020
Filing Date:
July 22, 2019
Export Citation:
Assignee:
SG MICRO CORP (CN)
International Classes:
H03M1/66
Foreign References:
| CN106341130A | 2017-01-18 | |||
| CN108243313A | 2018-07-03 | |||
| CN105530010A | 2016-04-27 | |||
| US20110199062A1 | 2011-08-18 |
Attorney, Agent or Firm:
TOWIN INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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