Patent ID: 6897726

Claim:
A differential circuit comprising: a first differential pair, conductivity thereof being a first type, having a differential input pair for receiving first and second input voltages, a first constant-current source for driving said first differential pair; a second differential pair, conductivity thereof being a second type, having a differential input pair for receiving said first and second input voltages, a second constant-current source for driving said second differential pair; a first load circuit, including a plurality of transistors of second-type conductivity, connected to a first power supply, for functioning as an active load of said first differential pair; a second load circuit, including a plurality of transistors of first-type conductivity, connected to a second power supply, for functioning as an active load of said second differential pair; connection means for establishing connection between said first load circuit and said second load circuit, for allowing a passage of a current from at least one of said first load circuit and said second load circuit to the other of said first load circuit and said second load circuit; a first output outputted from said first load circuit; a second output outputted from said second load circuit; and changeover means for changing over between a first connection state for activating the first output and deactivating the second output and a second connection state for activating the second output and deactivating the first output.