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Low power cyclic A/D converter

A technology of analog-to-digital converter and cyclic redundancy, which is applied in the direction of analog-to-digital conversion, code conversion, instruments, etc.

Inactive Publication Date: 2008-01-23
NXP USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the analog signal received by this device must be converted to digital

Method used

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  • Low power cyclic A/D converter
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  • Low power cyclic A/D converter

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Embodiment Construction

[0013] The following detailed description in conjunction with the accompanying drawings is described as a current preferred embodiment of the present invention, and does not represent the only form in which the present invention can be implemented. It should be noted that the same or equivalent functions can be realized by different embodiments covered by the spirit and scope of the present invention. In the drawings, like elements are indicated by like numerals throughout.

[0014] Referring now to FIG. 2, there is shown a block diagram of a cyclic A / D converter 20 in accordance with the present invention. A / D converter 20 includes a single RSD stage 22 and a digital section 24 . The single RSD stage 22 maintains the sampling rate and resolution of the prior art two-stage architecture without increasing the speed of the required gain / addition / subtraction circuits. Only the speed of the comparator has increased. The aforementioned gain / addition / subtraction functions, which ...

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Abstract

A low power cyclic RSD analog to digital converter (20) has a single RSD stage (22) that receives one of an analog input signal and a residual voltage feedback signal and converts the one selected signal to a digital output signal. The RSD stage (22) generates the residue voltage feedback signal. A first switch (32) is connected between a converter input terminal (30) and an input terminal of the RSD stage (22) for applying the analog input signal to the RSD stage input terminal. A second switch (52) is connected between an output terminal of the RSD stage (22) and the input terminal of the RSD stage. The RSD stage (22) includes a pair of comparators (34, 36) that predetermined high and low voltages, respectively. A logic circuit (38) generates the digital output signal based on these outputs.

Description

technical field [0001] The present invention relates to redundant signed digit (RSD) analog-to-digital converters, and more specifically to low power single-stage RSD A / D converters. Background technique [0002] Advances in integrated circuit technology have enabled the development of complex "system-on-a-chip" ICs for a variety of applications, such as wireless communications and digital cameras. These applications are embodied in portable electronic devices, for which low power and small circuit area are key design factors. It is necessary to use low power and low voltage circuits to reduce the power requirements of the battery. Low power and low voltage circuits can realize the design requiring fewer or smaller batteries, and fewer or smaller batteries can reduce the size of the device. size, weight, and operating temperature. [0003] However, the analog signals received by such devices must be converted to digital signals. Various conventional cyclic (algorithmic) A...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/40
CPCH03M1/403H03M1/40
Inventor 窦格拉斯·加里蒂帕特里克·L·莱克斯
Owner NXP USA INC