Patent ID: 7589591

Claim:
A differential operation circuit comprising: a first differential input node; a second differential input node; a common mode following circuit configured such that, when a first differential input signal is applied to the first differential input node and a second differential input signal is applied to the second differential input node, the common mode following circuit generates at least one signal that at least partially follows a common mode of the first and second differential input signals; a first differential output signal generation circuit configured to: A) be coupled to the first differential input node so as to receive at least a derivative of the first differential input signal when the first differential input signal is applied to the first differential input node, wherein the at least the derivative of the first differential input signal includes a common mode component; B) be coupled to the common mode following circuit so as to receive at least a derivative of a first signal generated by the common mode following circuit, the first signal generated by the common mode following circuit including a common mode component; and C) generate a first differential output signal that uses the common mode component of the at least the derivative of the first differential input signal and the common mode component of the at least the derivative of the first signal generated by the common mode following circuit in a manner that reduces a common mode component of the first differential output signal; and a second differential output signal generation circuit configured to: A) be coupled to the second differential input node so as to receive at least a derivative of the second differential input signal when the second differential input signal is applied to the second differential input node, wherein the at least the derivative of the second differential input signal includes a common mode component; B) be coupled to the common mode following circuit so as to receive at least a derivative of a second signal generated by the common mode following circuit, the second signal generated by the common mode following circuit including a common mode component; and C) generate a second differential output signal that uses the common mode component of the at least the derivative of the second differential input signal and the common mode component of the at least the derivative of the second signal generated by the common mode following circuit in a manner that reduces a common mode component of the second differential output signal.