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a/d conversion circuit

A conversion circuit, converter technology, applied in the direction of analog/digital conversion, code conversion, electrical components, etc., can solve the problem of no enlightenment, no record, etc., and achieve the effect of avoiding unstable action

Inactive Publication Date: 2015-11-25
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in Patent Documents 1 and 2, regarding reference to Figure 9 to Figure 12 There is no description or suggestion of the technical problem of the explained A / D conversion circuit (explained below), and the technical solution for the technical problem

Method used

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Examples

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no. 1 Embodiment

[0089] figure 1 It is a figure which shows the structure of the disclosed 1st Example. figure 2 yes means figure 1 A diagram of the primary configuration of a 1-bit A / D converter. In this embodiment, the selector 16 of the 1-bit A / D converter 10 and Figure 10 The illustrated 1-bit A / D converter 10' has the same configuration except that the selector 15 is different. and Figure 10 Similarly, the primary 1-bit A / D converter 10 includes: a first amplifying circuit 11 for differentially inputting and differentially amplifying the differential output Via of the first preamplifying circuit 21; a second amplifying circuit 12 for differentially amplifying The differential output Vib of the second preamplifier circuit 22 is differentially input and differentially amplified; The input signal input to the input terminal and the input signal input to the inverting input terminal (input terminal with ○) of the second amplifying circuit 12 are differentially input and differential...

no. 2 Embodiment

[0169] Next, the disclosed second embodiment will be described. Figure 8 It is a figure which shows the structure of 2nd Example. like Figure 8 As shown, in this embodiment, in figure 1 The first and second track-and-hold circuits (T / H circuits) 31 and 32 are provided between each stage of each 1-bit A / D converter 10 connected in cascade as shown, and are synchronized with a clock signal (such as an external clock signal) ground, so that the stages are sequentially pipelined. For example, between the first differential output terminal of the selector 16 of the primary 1-bit A / D converter 10 and the differential input terminal of the first amplifier circuit 11 of the first-stage 1-bit A / D converter 10 Equipped with a first tracking and holding circuit (T / H circuit) 31 of differential input and differential output, the second differential output terminal of the selector 16 of the primary 1-bit A / D converter 10 and the first-stage 1 The second tracking and holding circuit ...

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Abstract

There are provided an A / D conversion circuit and a method for avoiding an unstable operation caused by discontinuity in a direct-current transfer characteristic of the A / D conversion circuit. Each of cascade-connected one-bit A / D converters (10) includes first and second amplifier circuits (11, 12), a third amplifier circuit (13) that outputs an interpolation value (intermediate value) of outputs of the first and second amplifier circuits, a comparator (14) that outputs a binary signal whose value is determined by a polarity of an output of the third amplifier circuit, and a selector (16) that selects two of three outputs (Va, Vb, Vc) of the first to third amplifier circuits (11ˆ¼13), based on a value of the comparator (14). In the one-bit A / D converter, a voltage segment [A - C] or [C - B], where C indicates the midpoint of a voltage segment [A - B] of an input voltage, is identified to output a 1-bit signal. A logic configuration of the selector (16) is set such that direct-current transfer characteristics of two outputs of the selector of the one-bit A / D converter are folded at the midpoint C of the voltage segment [A - B] and are symmetrical relative to the midpoint C of the voltage segment [A - B].

Description

technical field [0001] [Remarks for related application] [0002] The present invention claims priority based on Japanese Invention Patent Application: Japanese Patent Application No. 2010-012100 (applied on January 22, 2010), and all the contents of this application are cited and incorporated into this application. [0003] The present invention relates to an A / D conversion circuit for converting an analog signal into a digital signal. Background technique [0004] In recent years, the development of digital technology has been remarkable. Therefore, A / D conversion devices that convert analog signals to digital signals are also increasingly required to be higher in speed, lower in power, and smaller in size. As an A / D conversion circuit capable of achieving high-speed and low-power A / D conversion with a small-scale circuit configuration, there is known a circuit configuration in which a flash-type 1-bit (bit) A / D converter (with a small number of Amplifying circuits, comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/44
CPCH03M1/445H03M1/204H03M1/44
Inventor 野口荣实
Owner NEC CORP
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