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current generating circuit

A current generation circuit, current technology, applied in the current generation circuit, the field of current generation

Active Publication Date: 2022-01-18
SOCIONEXT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In that case, however, the accuracy of the impedance ladder becomes a critical issue, especially when the currents involved become very small

Method used

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Examples

Experimental program
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Embodiment Construction

[0061] To avoid having to scale down the current flowing in the LSB circuit compared to the current flowing in each MSB segment, and also to avoid using an impedance ladder, the same circuit as in each MSB segment can be used in each LSB circuit (so that the current flowing in the LSB circuit is the same as the current flowing in each MSB segment), and use a current mirror of appropriate ratio in the LSB circuit to scale down the corresponding current that contributes to the analog output signal. For example, the highest LSB can use a 2:1 current mirror to contribute half the current of each of the MSB segments.

[0062] If such a current mirror with an appropriate ratio (such as 1:1) is also used in the MSB segment, the LSB circuit and the MSB segment can become identical to each other except for the difference between the ratios employed in the current mirror. This enables the adoption of segment architectures, for example grouping segments into sub-segment groups.

[0063]...

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PUM

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Abstract

A current generating circuit is disclosed, comprising: a plurality of candidate current sources operable to generate respective candidate currents; an output current source operable to generate an output current; a comparator circuit; and a control circuit operable to To control the current source and the comparator circuit and the connection between them to: In the adjustment step, the adjustment current is generated by selecting or summing the candidate currents, and by comparing the adjustment current with the comparison current and adjusting the current applied to the positive control signals of the candidate current sources being calibrated until the adjustment current and the comparison current reach a defined relationship to at least calibrate a plurality of candidate current sources; and in a calibration step following the adjustment step, a reference current is generated by selecting or summing the candidate circuits , and the output current source is calibrated by comparing its output current with a reference current and adjusting a control signal applied to the output current source until its output current reaches a defined relationship with the reference current.

Description

technical field [0001] The present invention relates to current generation, and in particular to current generating circuits and methods of generating current in such current generating circuits. Background technique [0002] Such a current generating circuit may be (or form part of) a digital-to-analog converter (DAC) circuit or other suitable circuit. Such circuitry may be implemented, for example, as an integrated circuit on an IC chip. [0003] It is known to use a so-called segmented architecture in DACs. As background information, figure 1 An overview of an example segmented DAC is shown. figure 1 The DAC in is part of a current-steering DAC integrated circuit (IC) and is designed to convert m-bit binary input words (D1 to Dm) (ie, digital input signals) into corresponding analog output signals. [0004] refer to figure 1 , DAC 1 contains an analog circuit comprising n number of identical current sources 2 1 to 2 n , where n=2 m-1 . Each current source 2 passe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/26H03M1/1061H03M1/742G05F3/262H03K5/24H03M1/1033H03M1/682
Inventor 哈桑·沙夫修弗拉德·克雷楚尼古拉斯·里瓦
Owner SOCIONEXT INC