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DA (Digital to Analog) converter

A technology of digital-to-analog converter and operational amplifier, applied in the direction of analog/digital conversion, code conversion, instruments, etc., can solve the problem that the coupling of the switch control signal to the output terminal needs to be reduced, and the effect is not obvious, so as to reduce the coupling and increase the power. Consumption, improve the effect of SFDR

Active Publication Date: 2013-09-04
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the actual application process, it is found that the effect of the above method of reducing the coupling of the switch control signal to the output terminal is not obvious, and the coupling of the switch control signal to the output terminal still needs to be reduced

Method used

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Examples

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Embodiment 1

[0049] This embodiment provides a digital-to-analog converter, the structure of the switch unit is: an operational amplifier is respectively arranged on both sides of the four MOS transistors connected in pairs to form a cascode structure, and each operational amplifier is connected A MOS tube that controls its on or off. Specifically, such as figure 1 Shown is the basic structural diagram of the switch unit of the digital-to-analog converter provided by the present invention, the switch unit includes: a first MOS transistor 1, a second MOS transistor 2, a third MOS transistor 3, a fourth MOS transistor 4, The fifth MOS transistor 5 and the sixth MOS transistor 6, the first operational amplifier 101 and the second operational amplifier 102, wherein:

[0050] The drain of the first MOS transistor 1 is connected to the source of the second MOS transistor 2 to form a cascode structure, and the drain of the third MOS transistor 3 is connected to the source of the fourth MOS trans...

Embodiment 2

[0085] Based on the first embodiment, this embodiment provides specific implementations of the first operational amplifier 101 , the second operational amplifier 102 , the first bias circuit 103 and the fourth bias circuit 104 .

[0086] Such as Figure 5 Shown is a specific structure of the switch unit of the digital-to-analog converter provided in this embodiment. The first operational amplifier 201 and the second operational amplifier 202 are single-stage operational amplifiers, respectively composed of two MOS transistors.

[0087]Specifically, the first operational amplifier 201 includes: a seventh MOS transistor 7 and an eighth MOS transistor 8, the drain of the seventh MOS transistor 7 is connected to the drain of the eighth MOS transistor 8; The first input end of the amplifier 201 is the gate of the seventh MOS transistor 7, the second input end of the first operational amplifier 201 is the drain electrode of the eighth MOS transistor 8, and the first operational ampl...

Embodiment 3

[0098] Based on Embodiment 1, this embodiment provides another specific implementation of the first operational amplifier and the second operational amplifier. Compared with the switching unit in Embodiment 2, the output impedance of the switching unit in this embodiment is further improved by one. about times.

[0099] Such as Image 6 As shown, the first operational amplifier 301 of the switch unit includes: an eleventh MOS transistor 11, a twelfth MOS transistor 12, a thirteenth MOS transistor 13, and a fourteenth MOS transistor 14. The eleventh MOS transistor 11 The drain is connected to the source of the twelfth MOS transistor 12, the drain of the twelfth MOS transistor 12 is connected to the drain of the thirteenth MOS transistor 13, and the source of the thirteenth MOS transistor 13 Connect the drain of the fourteenth MOS transistor 14; the first input terminal of the first operational amplifier 301 is the gate of the twelfth MOS transistor 12, and the second input ter...

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Abstract

The invention provides a DA (Digital to Analog) converter which comprises a switching unit. The switching unit comprises a first MOS (Metal Oxide Semiconductor) tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a first operational amplifier and a second operational amplifier. The operational amplifiers can increase impedances of the MOS tubes at the same side with the operational amplifiers and reduce coupling of a control signal on the output end so as to improve the SFDR (Spurious Free Dynamic Range); and the two operational amplifiers are respectively connected with one MOS tube, so that the effect that when the MOS tubes at one side of the switching unit are switched off, the operational amplifier at the same side with the MOS tubes is also simultaneously switched off without consuming additional power consumption is implemented, and thus, no more power consumption can be increased by the DA converter provided by the invention on the basis of implementing the high SFDR.

Description

technical field [0001] The present invention relates to the technical field of integrated circuits, and more specifically, to a digital-to-analog converter. Background technique [0002] With the continuous development of digital signal processing technology, digital-to-analog converters have become an indispensable and important module in modern communication systems. It is usually used between the transmitter and the digital baseband processor on the signal channel to realize the conversion function of digital signal to analog signal. [0003] Since the input signal of the digital-to-analog converter is usually a composite signal composed of multiple frequencies, the digital-to-analog converter of the adjacent channel may receive spurious interference, thereby reducing the signal ratio of the channel or even causing channel blocking. [0004] Therefore, when the multi-channel DACs work simultaneously, it is very important that each DAC meets the minimum spurious-free dyna...

Claims

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Application Information

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IPC IPC(8): H03M1/74
Inventor 赵喆陈岚吕志强
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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