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1. 发明授权

US5629699A Analogue-to-digital converter and analogue-to-digital conversion system embodying said converter 失效
标题翻译：实现所述转换器的模数转换器和模数转换系统
公开(公告)号：US5629699A
公开(公告)日：1997-05-13
申请号：US499957
申请日：1995-07-10
申请人： Jean Chazelas , Guy Le Parquier , Fran.cedilla.ois Renault
发明人： Jean Chazelas , Guy Le Parquier , Fran.cedilla.ois Renault
IPC分类号： G01J9/02 , G02F7/00 , H03M1/12 , H03M1/64 , H03M7/00 , H03M1/00
CPC分类号： H03M1/64 , G02F7/00
摘要： An N-bit analogue-to-digital converter can increase the resolution by 3 bits, by very precise coding of the differential phase at the output of the electro-optic phase modulator controlled by the electric signal to be converted. The optical signals obtained are processed by an electro-optic device that outputs electric signals that are functions of the sine and cosine of the phase. A coding device uses the symmetry of the trigonometric circle partitioned into four consecutive sectors between 0 and 27.pi. in order to convert the absolute values of the electric signals obtained on (N-3) bits, independently of the home sector of the phase. A transcoding device uses the value of the sine and cosine coded on (N-3) bits, to output a value V of the electric signal, on N bits, as a function of the home sector. The conversion system according to the invention comprises a first N-bit analogue-to-digital converter doing a very precise but ambiguous conversion of the electric signal, and a second analogue-to-digital converter to eliminate the ambiguity.
摘要翻译：通过对由要转换的电信号控制的电光相位调制器的输出进行非常精确的差分相位编码，N位模数转换器可以将分辨率提高3位。所获得的光信号由输出作为相位的正弦和余弦函数的电信号的电光装置处理。编码装置使用分割成0和27π之间的四个连续扇区的三角圆的对称性，以便独立于相位的归属扇区来转换在（N-3）位上获得的电信号的绝对值。代码转换装置使用在（N-3）比特上编码的正弦和余弦值作为家庭扇区的函数在N比特上输出电信号的值V. 根据本发明的转换系统包括对电信号进行非常精确但模糊的转换的第一N位模数转换器，以及用于消除模糊度的第二模数转换器。

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