a method and apparatus is provided for comparing a first input voltage to a second input voltage . in one embodiment of the invention , a first input voltage is transformed into a first current flowing through a first transistor and a second transistor . a second input voltage is transformed into a second current flowing through the first transistor while the first current continues flowing through the second transistor . a difference current is developed which represents the difference between the first current and the second current . an indicator signal is generated which indicates the larger of the first and second input voltages based on the value of the difference current .