Abstract: A fully differential operational amplifier includes first and second frequency dependent impedance dividers, preferably frequency dependent current dividers, each of which has an input, a noninverting output and an inverting output. A respective input is coupled to a differential input signal. The noninverting output of the first frequency dependent impedance divider is electrically coupled to the inverting output of the second frequency dependent impedance divider, and the noninverting output of the second impedance divider is electrically coupled to the inverting output of the first divider. A current feedback buffer electrically couples the noninverting output of a respective frequency dependent impedance divider to its associated input. The cross coupling and current feedback buffers provide positive feedback action which merges the inverting and noninverting differential signals as a function of frequency.

Abstract: A method for identifying a signal subject to intersymbol interference comprising the steps of receiving .tau.+1 samples of the signal where .tau. is greater than or equal to one; searching a tree representation of known values to determine the path of the branch of the tree which most closely corresponds to the .tau.+1 samples of the signal; and releasing the symbol of the first metric of the determined branch. The released symbol is the identity of the sample. Preferably, the receiving step includes the step of receiving .tau.+1 sequential samples, with each sample corresponding to a unique portion of the signal, and the searching step includes the step of comparing each symbol of each metric of each path of each branch with the symbol's corresponding sample in regard to time.

Abstract: The present invention pertains to an integrated circuit. The integrated circuit comprises a sensor which produces a sensor signal corresponding to energy received. The integrated circuit is also comprised of a processing element connected to the sensor which receives the sensor signal only from the sensor and produces a processing signal corresponding to the sensor signal. Additionally, there is a memory connected to the processing element for receiving the processing signal and storing the processing signal. In a preferred embodiment, the integrated circuit is also comprised of a buffer connected to the sensor and the processing element for receiving the sensor signal and buffering the sensor signal for reception by the processing element. The sensor can include a photodiode which receives the sensor signal corresponding to light energy it receives.