Squaring circuit apparatus

Claim 1

Squaring apparatus comprising, in combination: apparatus input means for supplying an analog input signal to be squared; duty cycle means, connected to said input means for receiving signals therefrom, for providing output control signals having a duty cycle representative of the amplitude of said input signals; and apparatus gating means, including input means connected to said apparatus input means, control means connected to said duty cycle means for receiving control signals therefrom and first and second output means, for supplying output signals from one of said first and second output means in accordance with the polarity of said analog input signal and representative in amplitude of the square of said input signal, wherein said duty cycle means is a converter including, first switch means including first and second gating means each having an input means, an output means and a control means for controlling a conductive path between said input means and said output means of the gating means, first and second feedback signal source means connected to said input means of said first and second gating means respectively of said first switch means; integrating means including input means and output means, analog signal supplying means for supplying the input signal to be squared, means connecting said analog signal supplying means and said output means of said first switch means to said input means of said integrating means, voltage sensitive second switch means including input means and control signal first and second output means, said second switch means providing an output of a given polarity at said first output means thereof when a signal at said input means thereof exceeds a first reference level and the second output means thereof providing an output signal of said given polarity when a signal provided to said input thereof exceeds a second reference level, means connecting said output means of said integrating means to said input means of said second switch means, means connecting said control output means of said second switch means to said control means of said first switch means, the output signal from said control output means of said voltage sensitive switch means being representative in duty cycle of the amplitude of signals provided by said analog signal supplying means, and wherein said apparatus gating means includes inverting means connected within said apparatus gating means and to the one of said output means providing output signals with negative polarity analog input signals; and means connecting an output of said inverting means to the other output means of said apparatus gating means for supplying apparatus output signals whereby the squared apparatus signal is positive regardless of the polarity of said input signal to be squared.