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AD conversion circuit, semiconductor device and AD conversion method

A conversion circuit and reference voltage technology, applied in the direction of code conversion, analog/digital conversion, electrical components, etc., can solve problems such as redundant sampling time

Active Publication Date: 2014-04-09
SOCIONEXT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there may be excess sample time

Method used

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  • AD conversion circuit, semiconductor device and AD conversion method
  • AD conversion circuit, semiconductor device and AD conversion method
  • AD conversion circuit, semiconductor device and AD conversion method

Examples

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Embodiment Construction

[0021] Embodiments will now be described with reference to the drawings, wherein like reference numerals refer to like elements throughout.

[0022] figure 1 An example of the AD conversion circuit according to the embodiment is shown. figure 1 The AD conversion circuit 10 shown in FIG. 1 is a clock asynchronous and successive comparison type AD conversion circuit.

[0023] The AD conversion circuit 10 includes a capacitive DAC (Digital to Analog Converter) 11 , a reference voltage generator 12 , a comparator 13 , a switch 14 , a sampling time controller 15 , an internal clock generator 16 , and a controller 17 .

[0024] The capacitive DAC 11 includes a plurality of capacitive elements C0 , C1 , . . . and Cn and switches SW0 , SW1 , . Each switch SW0, SW1, . . . and SWn is connected to one terminal of the corresponding capacitive element C. The other terminal of each capacitive element C0, C1, ... and Cn is connected to the inverting input terminal of the comparator 13 (by...

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Abstract

The invention discloses an AD conversion circuit, a semiconductor device and AD conversion method. The AD conversion circuit comprises a reference voltage generator which generates a reference voltage at the time of sampling a received input signal, and a sampling time controller which detects a change in the reference voltage. When the reference voltage rises to a determined threshold, the sampling time controller determines that sampling is completed, and generates a sampling clock in which sampling time is controlled on the basis of an external clock.

Description

technical field [0001] The embodiments discussed here relate to AD conversion circuits, semiconductor devices, and AD conversion methods. Background technique [0002] A successive comparison type AD (Analog to Digital) conversion circuit that includes a small number of analog circuits and can be realized by using a relatively simple circuit is known. The successive comparison type AD conversion circuit is closely related to the CMOS (Complementary Metal Oxide Semiconductor) process and can be made very small. Therefore, successive comparison type AD conversion circuits are used for various purposes. [0003] There are two types of conversion methods used in successive comparison AD conversion circuits: clock synchronous and clock asynchronous. In clock synchronization type conversion, AD conversion is performed for each clock of an external clock. [0004] On the other hand, in clock asynchronous type conversion, AD conversion of all bits is performed by one clock of an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/46
CPCH03M1/462H03M1/468H03M1/1245
Inventor 熊仓芳明
Owner SOCIONEXT INC
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