Abstract: An operational amplifier circuit that provides negative feedback and high gain is described. Specifically, the circuit comprises a first gain stage, a second gain stage, a feedback circuit, and a biasing circuit.

Abstract: An operational amplifier circuit that provides negative feedback and high gain is described. Specifically, the circuit comprises a first gain stage, a second gain stage, a feedback circuit, and a biasing circuit.

Abstract: A biasing technique between a first circuit stage and a second circuit stage is described. Specifically, the technique comprises using a combination of thin and thick oxide transistors.

Abstract: A multi-path unity gain buffer circuit and method are implemented in a slew amplifier. The multi-path unity buffer has a high frequency signal path and a low frequency signal path. The high frequency signal path has a differential amplifier powered for providing a high frequency, low accuracy buffering operation. The low frequency signal path is coupled to the high frequency signal path. The low frequency signal path has an operational amplifier powered to provide a low frequency, high bandwidth buffering operation. An output of the operational amplifier is fed back to an input of the operational amplifier through a current varying element that varies current levels of the input of the operational amplifier to remove a level shift of an output signal of the differential amplifier.

Abstract: An output driver (121) for a 10BaseT/100BaseTX transceiver provides a drive capability for either a 10BaseT output or a 100BaseTX output. The driver includes a voltage-to-current converter for converting the voltage to a current level which is then selectably switched to the input of two constant output impedance buffers (327) and (328). For the 100BaseTX mode, a constant current is provided to the buffers and then the current switched in a multi-level mode in accordance with an MLT-3 encoding scheme with a current switch (311). The buffers (327) and (328) are trimmed as a function of temperature by varying the current generated by the voltage-to-current converter (303). This trimming is facilitated by generating an internal current with the voltage-to-current converter (303) and then summing therewith a zero temperature coefficient current referenced to an external resistor.