Patent ID: 7280610

Claim:
A data converter comprising: a parallel data input terminal through which parallel data having in-phase data and quadrature-phase data are input; a computation circuit connected to said parallel data input terminal; a first vector quantizer connected to an output side of said computation circuit; and an output terminal connected to an output side of said first vector quantizer, wherein said in-phase data and said quadrature-phase data are forming a predetermined vector; said computation circuit is formed by connecting n (n: a natural number) number of unit circuits each including a first vector subtracter having a first input terminal and a second input terminal, and a vector integrator connected to an output side of said first vector subtracter; an output at said output terminal and/or an output from said vector integrator in each of said unit circuits is input to the first vector subtracter through the second input terminal of the same in the unit circuit; said parallel data input terminal is connected to the first input terminal of the first vector subtracter in the first circuit unit; an output terminal of the vector integrator and the first input terminal of the first vector subtracter are connected to each other between said unit circuits; said first vector subtracter outputs parallel data obtained by subtracting a vector formed by parallel data input through said second input terminal from a vector formed by parallel data input through said first input terminal; and said vector integrator integrates the vector formed by the input parallel data, and said first vector quantizer outputs a predetermined value quantized at least with respect to the magnitude of an input vector.