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Digital-to-analog converter with a shared resistor string

A resistor, number technology, applied in the DAC field, can solve problems such as increase in area or size

Active Publication Date: 2014-09-03
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But with increased resolution, there is an increase in area or size, so it is highly desirable to have a DAC with high resolution and small area

Method used

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  • Digital-to-analog converter with a shared resistor string
  • Digital-to-analog converter with a shared resistor string
  • Digital-to-analog converter with a shared resistor string

Examples

Experimental program
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Embodiment Construction

[0021] figure 1 and 2 An example embodiment of a digital-to-analog converter (DAC) 100 is illustrated. As shown, DAC 100 generally includes decoder 101 and resolution circuitry 103 . Decoder 101 is generally configured to receive a digital input signal DIN and generate control signals that control switches within resolution circuit 103 to generate an analog output signal AOUT. The resolution circuit 103 generally includes a resistor string 105 comprising resistors R-1 to R-(M+2N) coupled together in series with each other between two voltage rails (ie, VDD and ground). ). As shown, this resolution circuit 103 is capable of generating two output signals OUT1 and OUT2 from buffers 102 and 104 (which may be differential and coupled across selected resistors and may be interpolation buffers); more output signals may also be possible. These output signals OUT1 and OUT2 (which may be referred to as side A and side B) are from separate sets of switches or switch banks SA-1 to SA...

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PUM

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Abstract

A digital-to-analog converter (DAC) includes a decoder and a resolution circuit (103). The circuit (103) has a plurality of resistors (R-l to R-(M+2N)), a first set of switches (SA-1 to SA- (N+M)), and a second set of switches (SB-1 to SB-(N+M)). The resistors are arranged in an array having a plurality of columns and a plurality of rows, where the number of resistors is an integer multiple of at least one of the number of columns and the number of rows. The resistors are coupled together in a skip-K pattern to form a resistor string (105). Each switch from the first and second sets of switches is coupled to the resistor string, and the first and second sets of switches are each arranged in a sequence and are offset from one another by an offset value. The first and second sets of switches are also arranged along the periphery of the array such that each switch from the first set of switches is located in proximity to and is associated with the same row or the same column as its corresponding switch in the sequence from the second set of switches.

Description

technical field [0001] This disclosure relates generally to digital-to-analog converters (DACs), and more particularly to DACs with shared resistor strings. Background technique [0002] A DAC is a common circuit used in a variety of applications. Typically, a DAC includes a switched voltage divider that outputs an analog signal based on a digital signal. For example, the voltage divider can be a resistor string or a resistor ladder (commonly referred to as an R-2R resistor ladder), and can increase resolution by increasing the number of voltage levels output from the DAC. But with increased resolution, there is an increase in area or size, so it is highly desirable to have a DAC with high resolution and small area. Some conventional DACs are described in US Patent Nos. 6,937,178, 7,259,706, 7,414,561 and 7,532,140. Contents of the invention [0003] Example embodiments provide an apparatus. The apparatus includes: a plurality of resistors arranged in an array having a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
CPCH03M1/685H03M1/0651
Inventor 拉尔夫·G·奥伯休伯策登尼亚·A·亚伯拉罕马克·希尔
Owner TEXAS INSTR INC