Using an operational amplifier with a low gain in a closed loop amplifier circuit, and correcting for errors (i.e., deviation from the output of an ideal closed loop amplifier using an operational amplifier with infinite gain) that would result from the use of the operational amplifier with low gain. In an embodiment implemented in relation to an analog to digital converter (ADC), a mathematical operation is performed on the digital code(s) generated by the ADC to generate a corrected code corre...

According to an aspect of the present invention, samples of an input signal are provided with reduced distortion, when the input signal is received from a lead terminal offering lead inductance on an input path. Such a feature is achieved by charging a energy storage element to a value proportional to the input signal using a portion of charging energy received through a path having less lead inductance compared to the path connecting the input signal to the energy storage element. Thus, the ene...

Ensuring sufficient bias current is provided to a portion of a circuit containing low voltage transistors operating with a high supply voltage. Such a sufficient bias current may be ensured by generating a primary bias current from a low supply voltage and a backup bias current from a high supply voltage, and providing the backup bias current as the bias current if the primary bias current is not present. The primary bias current may be provided as the bias current when the low supply voltage is...

A method for reducing transmit echo in a DSL modem comprises selecting at least one cancellation device of a plurality of cancellation devices. An attenuation signal is generated using the selected cancellation device. At least a portion of transmit echo is removed from a receive signal using the attenuation signal.