Abstract: An improved operational amplifier generates an output signal which varies according to plural input signals. An input stage accepts the input signals and outputs an intermediate signal according to the input signals, and generates an internal control signal in place of an external control signal. A current source provides a current according to the internally provided control signal. A conversion stage generates an output signal as a function of the intermediate signal and the current. An output driver stage drives the output signal to a load and buffers the operational amplifier from the load. A precision voltage reference generator based upon the operational amplifier provides a stable voltage reference signal. The output driver provides an internal feedback signal to the input stage, in place of the external input signals, and a bandgap reference cell in the first state establishes a voltage for the output driver in place of an external bias signal.

Abstract: A segmented waveform generator comprising a plurality of ramp generators whose outputs are coupled to and summed in a summing circuit to provide a waveform having a desired harmonic content or shape. The ramp generators are triggered by the rising and falling edges of trigger pulses to provide symmetrical segmented waveforms.