Abstract: An adaptive equalizer is configured to reconstruct electronic signals which are transmitted over signal cables, such as twisted pair cables. The equalizer satisfactorily reconstructs the signals over a broad range of cable lengths. The degradation characteristics of a signal cable varies with cable length. Using the degradation characteristics for a cable over a desired range of lengths, the adaptive equalizer includes multiple parallel paths each of which are configured to reconstruct the input voltage signal optimized for a particular cable length. The degraded input signal is split according to a predetermined relationship into multiple partial signals, each signal for transmission through one each of the paths. Though each path is optimized to reconstruct the signal for a particular length of cable, the adaptive control adds a function of the actual cable length for more accurately reconstructing the signal. Each path forms a partial reconstructed signal.

Abstract: An amplifier having a very high gain-bandwidth product includes a first operational amplifier having its positive input connected to the amplifier's input. The output of the first operational amplifier is connected to the base of a transistor, the emitter of which is coupled by a gain-setting resistor to ground and is also directly connected to the negative input of the first operational amplifier. The collector of the transistor is connected by a resistive load to a supply voltage and is also directly connected to the negative input of a second operational amplifier. The output of the second operational amplifier is coupled by a capacitor back to its negative input. The output of the second operational amplifier is coupled by a feedback resistor back to the emitter of the transistor. The output of the second operational amplifier is connected to the output terminal of the amplifier.