Line driver or amplifier for e.g. digital subscriber line modem, has multiplier multiplying feedback signal with factor signal derived either from input signal or from preliminary stage such that output signal is created or simulated

摘要

The driver or amplifier has a resistor (R4) connected to an output amplifier at an input of a summation, differential or operating amplifier (OPA1). A multiplier (MUL1) is introduced in a feedback signal or in a coupling loop formed by the multiplier. The multiplier multiplies the feedback signal with a factor signal (FSIG), which is derived either from a driver input signal (IN) or from a digital preliminary stage of the digital input signal such that a variable, frequency and slope dependent output signal (OUT) containing reactive impedance portions is created or simulated.