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Analog-to-digital converter and method of generating an intermediate code for an analog-to-digital converter

An analog-to-digital converter and conversion technology, applied in the direction of analog-to-digital conversion, code conversion, instruments, etc., can solve the problems of analog-to-digital converter processing speed limit, limitation and so on

Inactive Publication Date: 2009-05-20
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the conversion from measurement signal code to Gray code is limited by the time to wait for the least significant bit to arrive
This presents a limitation on the processing speed of known ADCs

Method used

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  • Analog-to-digital converter and method of generating an intermediate code for an analog-to-digital converter

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Embodiment Construction

[0024] figure 1 An analog-to-digital converter 2 is shown which converts an analog input signal 4 into a digital binary output signal 6 . The analog-to-digital converter 2 comprises a reference unit 8 for generating a measurement signal 10 from a comparison of an input signal 4 with a reference voltage 12, the measurement signal being a bit word of a first set of bit words. This first set of bit words is also called the measurement signal code. A very suitable type of measurement signal is a so-called thermometer signal.

[0025] Furthermore, the analog-to-digital converter 2 also includes a first logic circuit 14 connected to the reference unit 8 for generating an intermediate signal 16 from the measurement signal 10 . Intermediate signal 16 is a bit word of the second set of bit words. This second set of bit words is called the intermediate code. Each bit word in the intermediate code represents a unique value, and two bit words belonging to successive unique values ​​di...

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Abstract

Analog-to-digital converter for converting an analog input signal into a digital binary output signal includes a reference unit for generating a thermometric signal based on comparison of the input signal with a reference voltage level, a first logic circuit connected to the reference unit for generating an intermediate signal based on the thermometric signal, and a second logic circuit connected to the first logic circuit for generating the digital binary output signal based on the intermediate signal. The thermometric signal includes a bit word from a first set of bit words and the intermediate signal includes a bit word from a second set of bit words. Bit words from the second set are arranged in rows of a matrix, the sequence of the rows corresponding to unique numbers represented by the bit words. Respective numbers of bit changes in the respective columns of the matrix are at least substantially equal.

Description

technical field [0001] The invention relates to an analog-to-digital converter for converting an analog input signal into a digital binary output signal, the analog-to-digital converter comprising: a reference unit for generating a measurement signal based on a comparison of the input signal with a reference voltage; a A first logic circuit connected to the reference unit to generate an intermediate signal based on the measurement signal; and a second logic circuit connected to the first logic circuit to generate a digital binary output signal based on the intermediate signal, wherein the measurement signal includes a first set of one of the bit words and said intermediate signal comprises one bit word of a second set of bit words, each bit word representing a unique value and two bits of the second set belonging to two consecutive unique values ​​respectively The words differ by only one bit, wherein the bit words in said second group are arranged in rows of a matrix in an or...

Claims

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Application Information

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IPC IPC(8): H03M1/06H03M1/36H03M7/16
CPCH03M7/165
Inventor P·C·S·肖坦斯
Owner NXP BV