Current mode analogue-to-digital converter capable of improving conversion accuracy
A technology of analog-to-digital converter and current mode, which is applied in the direction of analog/digital conversion calibration/testing, etc. It can solve problems affecting the accuracy of current mode ADC, achieve the effect of eliminating mismatch problems and improving accuracy
Active Publication Date: 2014-05-14
NO 771 INST OF NO 9 RES INST CHINA AEROSPACE SCI & TECH
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[0004] However, most systems still use the voltage mode processing system, so the analog signal input to the analog-to-digital converter is generally a voltage signal, and the voltage signal must be converted into a current signal before the current-mode analog-to-digital converter is processed.
In order to be directly compatible with the voltage mode analog-to-digital converter, the input analog voltage signal and the reference voltage signal are required, but even if the input analog voltage signal and the reference voltage signal are converted through the same structure units, there will be The error between two identical units, this error will directly affect the accuracy of the current mode ADC, so it is necessary to improve this
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[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] figure 1 To invent a current-mode analog-to-digital converter structure that improves conversion accuracy, figure 2 It is a specific implementation example.
[0016] Such as figure 1 As shown, the clock signal 60 generated by the clock generating unit 30 controls the first switch, the second switch, the third switch and the fourth switch. Such as figure 2 As shown, the clock signals generated by the clock generating unit 30 are 601 , 602 , 603 and 604 . Among them, 601 and 603 are the sampling phases of the clock, 602 and 604 are the holding phases of the clock, and the following discussion takes the high level as the effective level of sampling. In order to prevent the glitch at the beginning of the sampling time, the sampling time of the clock signal 603 can be delayed for a period of time compared with 601, and the sa...
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The invention discloses a current mode analogue-to-digital converter capable of improving conversion efficiency. The converter comprises a clock generation unit, a first switch for switching an external input analogue voltage signal, a second switch for switching a reference voltage signal, a transconductance operational amplifier for converting an input voltage signal into a current signal, a current signal sampling and holding unit, a third switch for switching current sampling and holding output, and a fourth switch for switching the current sampling and holding output. The technology of time sharing multiplexing of the transconductance operational amplifier and the current sampling and holding unit can effectively reduce the accuracy loss of the analogue-to-digital converter in a process of converting the voltage signal into the current signal, thereby improving the accuracy of the current mode analogue-to-digital converter. The invention can be widely applied to the high-speed high-accuracy current mode analogue-to-digital converter products.
Description
technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a broadband data communication system, a high-speed wireless communication system and various data conversion product applications. Background technique [0002] Today's world is a highly information-based society. The ever-changing digital communication technology promotes the rapid development of society. Using digital signal processing systems for information processing has become a common choice. However, various objects and signals in the real world are analog, so an analog-to-digital converter needs to be used to convert analog signals to digital signals. [0003] In recent years, with the continuous development of manufacturing technology and the pursuit of low power consumption performance of circuits, the power supply voltage of integrated circuits has gradually decreased, which makes the design of analog-to-digital converters with voltage signals as variables becomi...
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IPC IPC(8): H03M1/10
Inventor 郭仲杰吴龙胜刘佑宝
Owner NO 771 INST OF NO 9 RES INST CHINA AEROSPACE SCI & TECH