US 5,958,002 A · Vector absolute--value calculation circuit

Abstract

A highly accurate vector absolute-value calculation circuit uses analog processing and minimal hardware. Signal voltages corresponding to an I component (real number part) and a Q component (imaginary number part) are input to a first absolute-value calculation circuit 13 and a second absolute-value calculation circuit 14 through terminals 11 and 12, respectively, and they are each converted into absolute-value signals. The component I absolute-value and component Q absolute-value are compared in a comparison circuit 20. According to the result, the larger absolute-value signals are output to an input capacitor 23 of a neural computation circuit, and the smaller absolute-value signals are output to an input capacitor 24 by controlling multiplexers 21 and 22. The capacity ratio of a feedback capacitor 26 of a neural computation circuit and input capacitors 23 and 24 is 11:10:5. The complex number absolute-value calculated by the following formula is output from an output terminal 27. ##EQU1##

Claims15

Dependent claims

A vector absolute-value calculation circuit comprising:

i) a first absolute-value calculation circuit, to which a first input signal is input corresponding to a first component of a two-dimensional vector, for outputting a first absolute-value calculated signal having an amplitude equal to an amplitude of said first input signal, and having a single polarity;
ii) a second absolute-value calculation circuit, to which a second input signal is input corresponding to a second component of a two-dimensional vector, for outputting a second absolute-value calculated signal having an amplitude equal to an amplitude of said second input signal, and having a single polarity;
and
iii) operating means for multiplying a first coefficient with a larger of said first and second absolute-value signals, for multiplying a second coefficient with a smaller of said first and second absolute-value signals, and for outputting a signal comprising a sum of both multiplication results.

1 more element

A vector absolute-value calculation circuit comprising:

i) a first input terminal receiving a first input signal corresponding to a first component of a two-dimensional vector;
ii) a second input terminal receiving a second input signal corresponding to a second component of a two-dimensional vector;
iii) a first absolute-value calculation circuit connected to said first input terminal, for outputting a first absolute-value signal having an amplitude equal to an amplitude of said first input signal, and having a single polarity;
iv) a second absolute-value calculation circuit connected to said second input terminal, for outputting a second absolute-value signal having an amplitude equal to an amplitude of said second input signal, having a single polarity;
v) a comparison circuit for comparing said first and second absolute-value signals;
vi) first selecting means for operating after comparison in said comparison circuit to select and output said first absolute-value signal when said first absolute-value signal is equal to or larger than said second absolute-value signal, and to select and output said second absolute-value signal when said first absolute-value signal is smaller than said second absolute-value signal;
vii) second selecting means operating after comparison in said comparison circuit to select and output said second absolute-value signal when said first absolute-value signal is equal to or larger than said second absolute-value signal, and to select and output said first absolute-value signal when it is smaller than said second absolute-value signal;
and
viii) a weighted addition circuit for multiplying said first coefficient with an input signal from said first selecting means, for multiplying said second coefficient with an input signal from said second selecting means, and for outputting a signal comprising a sum of both multiplication results.

6 more elements

A vector absolute-value calculation circuit comprising:

i) a first input terminal receiving a first input signal corresponding to a first component of a two-dimensional vector;
ii) a second input terminal receiving a second input signal corresponding to a second component of a two-dimensional vector;
iii) a first absolute-value calculation circuit, connected to said first input terminal, for outputting a first absolute-value signal having an amplitude equal to an amplitude of said first input signal, and having a single polarity;
iv) a second absolute-value calculation circuit, connected to said second input terminal, for outputting a second absolute-value signal having an amplitude equal to an amplitude of said second input signal, and having a single polarity;
v) a first weighted addition circuit for multiplying a first coefficient with said first absolute-value signal, for multiplying a second coefficient with said second absolute-value signal, and for outputting a signal comprising a sum of both multiplication results,
vi) a second weighted addition circuit for multiplying said second coefficient with said first absolute-value signal, for multiplying said first coefficient with said second absolute-value signal, and for outputting a signal comprising a sum of both multiplication results;
vii) a comparison circuit for comparing said first and second absolute-value signals;
and
viii) selecting means operable after the comparison in said comparison circuit to select and output the output of said first weighted addition circuit when said first absolute-value signal is equal to or larger than said second absolute-value signal, and to select and output the output of said second weighted addition circuit when said first absolute-value signal is smaller than said second absolute-value signal.

6 more elements

A vector absolute-value calculating circuit comprising:

a first absolute-value calculation circuit comprising an input terminal receiving a first input signal comprising a first component of a two-dimensional vector, said first absolute-value circuit outputting a first absolute-value signal having a constant amplitude equal to an amplitude of said first input signal and having a constant polarity;
a second-value circuit comprising an input terminal receiving a second input signal comprising a second component of said two-dimensional vector, said second absolute-value calculation circuit outputting a second absolute-value signal having a constant amplitude equal to an amplitude of said second input signal and having a constant polarity;
and
a comparator for comparing an amplitude of said first absolute-value signal with an amplitude of said second absolute-value signal;
an operating circuit operable in accordance with the amplitude of said first absolute-value signal in relation to the amplitude of said second absolute-value signal to multiply said first and second absolute-value signals with respective first and second coefficients, said first and second coefficients comprising constant values with different amplitudes, said operating circuit outputting a signal comprising a weighted sum of said first absolute-value signal and said second absolute-value signal.

2 more elements

Dependencies are inferred from the claim text.

Vector absolute--value calculation circuit

Life of this patent

Vector absolute--value calculation circuit

Life of this patent

Abstract

Claims15