Associated tri-state current digital-to-analog converter, and method for reducing current consumption of digital-to-analog conversion
A digital-to-analog conversion and current consumption technology, which is applied to a three-state current digital-to-analog conversion device and the field of reducing current consumption, can solve problems such as power waste and power consumption, and achieve the effect of reducing current consumption
Active Publication Date: 2014-07-09
MEDIATEK INC
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Problems solved by technology
In a typical class of conventional current DACs, for example, so-called tri-state current DACs, there is always a constant amount of power consumption regardless of whether the digital value input to the tri-state current DAC is large or small.
More specifically, even if the digital value input to a tri-state current DAC is small enough to indicate that the tri-state current DAC should not output current, there will still be some amount of power drain
In theory, the three-state current DAC does not output current but still has an internal sink current (sink current), resulting in waste of power. Therefore, a new method is needed to reduce the current caused by the digital-to-analog conversion process. power consumption
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[0018] Certain terms are used in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. In addition, the term "coupled" includes any direct and indirect electrical connection means. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device may be directly electrically conne...
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A three-state current digital-to-analog conversion device and a method for reducing current consumption thereof, wherein the three-state current digital-to-analog conversion device includes: at least one three-state current digital-to-analog conversion unit, which has a positive output current state, a zero output current state, and a negative output Current state; the control device is used to monitor a plurality of logic states of a group of differential digital inputs, and the group of differential digital inputs is used to control at least one tri-state current digital-to-analog conversion unit, wherein, when the logic state of the group of differential digital inputs indicates When the three-state current digital-to-analog conversion unit switches to the zero output current state, the control device temporarily reduces the direct current flowing through the middle path of the three-state current digital-to-analog conversion unit. Advantages of the present invention include reducing power consumption while maintaining overall circuit performance.
Description
technical field [0001] The present invention relates to the power consumption problem of a current (current) digital-to-analog conversion (Digital-to-Analog Conversion, DAC) device (hereinafter referred to as a DAC device), more specifically, a three-state current digital-to-analog conversion device and its reduction of current consumption Methods. Background technique [0002] Current DACs are used in a wide variety of technical fields. In a typical class of conventional current DACs, for example, so-called tri-state current DACs, there is always a certain amount of power consumption that persists no matter whether the digital value input to the tri-state current DAC is large or small. More specifically, even if the digital value input to the tri-state current DAC is small enough to indicate that the tri-state current DAC should not output current, there will still be some amount of power consumption that persists. In theory, the three-state current DAC does not output cu...
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IPC IPC(8): H03M1/66
CPCH03M1/002H03M1/747
Inventor 刘长舜林泽琦
Owner MEDIATEK INC