Patent ID: 7688114

Claim:
Apparatus, responsive to a differential input signal having first and second types of differential state changes, comprising: a first pair of ratio asymmetric inverters for inverting the differential input signal to produce a first differential output signal, the first pair of ratio asymmetric inverters having delay elements that cause the first pair of ratio asymmetric inverters to respond to a first type of differential state change more slowly than a second type of differential state change; a second pair of ratio asymmetric inverters for inverting the differential input signal to produce a second differential output signal, the second pair of ratio asymmetric inverters having delay elements that cause the second pair of ratio asymmetric inverters to respond to a second type of differential state change more slowly than a first type of differential state change; a first pair of transmission gates, controlled by the first differential output signal, for alternately driving a first control signal to first and second reference voltages; and a second pair of transmission gates, controlled by the second differential output signal, for alternately driving a second control signal to the first and second reference voltages, the first and second control signals having substantially differential edges that have a crossing point below an average value of the first and second reference voltages.