Patent ID: 8680939
Filing Date: 2014-03-25
Classification: H04B

Abstract:
1. A wideband differential equalizer configured and operative as a differential termination to compensate dynamically for cable-induced signal loss from any received differential analog video signal having a frequency in a range from DC to 200 MHz, said wideband differential equalizer comprising: input circuitry to receive at first and second input terminals thereof a first differential analog video signal having a maximum amplitude at a first value; output circuitry to output at first and second output terminals thereof a second differential analog video signal having a maximum amplitude at a second value less than the first value of the first differential analog video signal; and scaling circuitry operatively coupled between said input circuitry and said output circuitry and configured and operative to scale down dynamically the maximum amplitude of the first differential analog video signal from the first value to the second value, said scaling circuitry including: a first parallel-connected resistor-capacitor pair, a second parallel-connected resistor-capacitor pair, a first series-connected inductor-resistor pair, and a second series-connected inductor-resistor pair; a first end of said first parallel-connected resistor-capacitor pair being connected to the first input terminal of said input circuitry; a first end of said second parallel-connected resistor-capacitor pair being connected to the second input terminal of said input circuitry; a first end of said first series-connected inductor-resistor pair being connected to a second end of said first parallel-connected resistor-capacitor pair; a first end of said second series-connected inductor-resistor pair being connected to a second end of said second parallel-connected resistor-capacitor pair; and second ends of said first series-connected inductor-resistor pair and said second series-connected inductor-resistor pair being connected together, wherein said differential equalizer maintains a same differential impedance by +˜10% throughout the frequency range.