Patent ID: 6448806
Filing Date: 2002-09-10
Classification: G01R,H03K

Abstract:
A circuit for providing a logical output signal in accordance with crossing points of a differential signal, whereby the logical output signal has a first logical level and a second logical level, the differential signal comprises a normal input signal, and a complementary input signal as the complementary signal to the normal input signal, and the crossing points occur when the normal input signal and the complementary input signal have the same level, the circuit comprising:a first amplifier for amplifying a first signal difference between the normal input signal and a first threshold value, and for providing as a first output signal the amplified first signal difference, a second amplifier for amplifying a second signal difference between the complementary input signal and a second threshold value, and for providing as a second output signal, the amplified second signal difference, whereby the first and the second threshold values are set to the same level, a first comparator for providing the first logical level when a third signal difference between the first output signal and the second output signal is greater than a third threshold value, and for providing the second logical level when the third signal difference is smaller than the third threshold value.