Unlock instant, AI-driven research and patent intelligence for your innovation.

a/d converter

A technology of converters and clocks, applied in the field of A/D converters, can solve problems such as difficulty in maintaining conversion accuracy and inability to obtain sufficient action period, and achieve the effect of maintaining conversion accuracy

Inactive Publication Date: 2011-11-30
PANASONIC CORP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, with the increase in the operating frequency required for A / D converters in recent years, since the operating periods of the comparison circuit 111 and the encoding circuit 112 depend on the duty ratio of the external input clock signal CKIN, it may not be possible to obtain a sufficient frequency. operation, therefore, it is difficult to maintain transformation accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • a/d converter
  • a/d converter
  • a/d converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0058] figure 1 It is a diagram showing the block configuration of A / D converter 1000 according to Embodiment 1 of the present invention.

[0059] Such as figure 1 As shown, the A / D converter 1000 of Embodiment 1 includes: a comparison circuit 111, which compares the analog input signal during the period of the first predetermined level of the internal clock 203 (first clock), and the internal clock 203 During the period of the second specified level of the above-mentioned internal clock 203, the comparison result is kept; the encoding circuit 112 is reset during the period of the first specified level of the above-mentioned internal clock 203, and during the period of the second specified level of the above-mentioned internal clock 203, for the above-mentioned comparison The result is coded; the operation period detection circuit 121 operates according to the external input clock signal CKIN, and outputs the operation period detection signal that detects the operation peri...

Embodiment approach 2

[0075] Hereinafter, A / D converter 2000 according to Embodiment 2 of the present invention will be described with reference to the drawings.

[0076] FIG. 5( a ) shows the A / D converter 2000 of the second embodiment, and FIG. 5( b ) shows the operating period detection circuit 521 in the A / D converter 2000 of the second embodiment.

[0077] The A / D converter 2000 of the second embodiment shown in FIG. 5( a ) has an operation period detection circuit 521 shown in FIG. 5( b ) as an operation period detection circuit in the A / D converter.

[0078] That is, this operating period detection circuit 521 includes an inverter 160 and an encoding circuit replica 161 having the same configuration as the encoding circuit 112 in the A / D converter 2000 of the second embodiment, and the encoding circuit replica 161 includes a charging circuit. The charge precharge transistor 162, the ROM transistors ROM1 to ROMn, and the discharge transistor 163 discharge the charge.

[0079] The encoder cir...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an A / D converter. The conventional A / D converter has the following problem: Since the operation period of the constituent elements of the A / D converter depends on the pulse width of the external input clock, the A / D converter is If the operating period of the constituent elements of the A / D converter is insufficient, the conversion accuracy will be degraded. However, by providing a circuit for detecting the operating period of the constituent elements of the A / D converter inside the A / D converter, the By adjusting the duty ratio of the operating clock corresponding to the operating period of the constituent elements of the A / D converter, high-precision A / D conversion operation is realized without depending on the duty ratio of the external input clock.

Description

technical field [0001] The present invention relates to an A / D converter, and more particularly to an A / D converter having a parallel structure. Background technique [0002] Hereinafter, a conventional parallel A / D converter will be described. [0003] Figure 7 is a conventional parallel A / D converter (for example, Patent Document 1 figure 1 700, the A / D converter 700 includes a comparison circuit 111, an encoding circuit 112, and a clock buffer 122. [0004] The operation of the above-mentioned conventional parallel A / D converter 700 is described in "Embodiment 1" in the above-mentioned Patent Document 1, and it is as follows. [0005] That is, the external input clock signal CKIN is input to the clock buffer 122 , and the clock buffer 122 supplies the internal clock 203 synchronized with the external input clock signal CKIN to the comparison circuit 111 and the encoding circuit 112 . [0006] Figure 8 A timing chart of the comparison circuit 111 and the encoding ci...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/08
CPCH03M1/0624H03M1/365H03M1/206
Inventor 重森雅和须志原公治村田健治
Owner PANASONIC CORP