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High efficiency current source/sink dac

A technology of current source and current sink, which is applied in the direction of converting DC power input to DC power output, electrical components, and adjusting electrical variables, etc. It can solve the problems of power consumption and current source DAC, so as to reduce power consumption and self-heating , to reduce the effect of temperature drift

Pending Publication Date: 2021-10-19
ANALOG DEVICES INT UNLTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] V SOA and V DROPOUT The worst-case value of (MIN) varies greatly from its nominal value, thus causing excessive power dissipation in the current source DAC under nominal conditions

Method used

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  • High efficiency current source/sink dac
  • High efficiency current source/sink dac
  • High efficiency current source/sink dac

Examples

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Embodiment Construction

[0026] This document describes a circuit and method for dynamically adjusting the supply voltage of the output circuit of a current source / sink DAC such that the current source / sink DAC operates at a higher power than would be the case without such dynamic adjustment. Work efficiently. The supply voltage to the output circuit can be continuously adjusted in response to changes in the output voltage of the current source / sink DAC, and also in response to changes in the minimum dropout voltage requirement of the output circuit, which may be due to changes in the programmed output current, manufacturing Process variations, voltage levels, temperature variations, and variations over time (e.g. component aging). While the implementation focuses on the DAC, the described technique can be extended to any circuit with a similar output circuit that can output a programmable load current.

[0027] Programmable Current Source DAC

[0028] figure 1 A programmable current source digital...

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Abstract

The present invention relates to a high efficiency current source / sink DAC. The current source and / or current sink digital-to-analog converter (DAC) includes a DAC circuit that converts a digital code to an analog current or voltage signal, an optional transconductance circuit that converts a voltage output of the DAC circuit into a current signal, and an output circuit that amplifies a current output of the DAC circuit or optionally amplifies a current output of the transconductance circuit to set a desired high current output for application to an output of the current source and / or current sink DAC. A power supply control current may be coupled to a power supply circuit that supplies power to the output circuit of the current source and / or current sink DAC. The power supply control current adjusts the output of the power supply circuit to cause the current source and / or current sink DAC to operate at a higher power efficiency.

Description

technical field [0001] This article relates to high-efficiency current-source or current-sink digital-to-analog converters (DACs), and more specifically, a high-efficiency current-source or current-sink DAC capable of delivering programmable output current while consuming minimal power. Background technique [0002] A programmable current source or current sink digital-to-analog converter (DAC) works by converting a precision DAC voltage or current through an output circuit to a high output current. High output currents can be 300mA or greater. Such current source / sink DACs have been used for optical component biasing in optical communication systems. Most of these current source / sink DACs have DAC ) and output circuitry for higher power efficiency (V DDX / V SSX ). Typically, most of the total power is dissipated in the output circuit. The solution to reduce power consumption is to reduce the supply voltage of the output circuit. For a current source DAC, by setting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66G05F3/26
CPCH03M1/66G05F3/26H03M1/002H03F2200/468H03F2200/471H03F2200/481H03F2200/498H03F2200/75G05F3/262H03F1/0238H02M1/0045H02M1/0025H02M1/007H03F3/45475H02M1/0003H02M3/156
Inventor S·S·图科尔
Owner ANALOG DEVICES INT UNLTD
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