If you have a modern function generator on your bench it is quite likely to contain a direct-digital synthesis circuit that creates arbitrary waveforms using a microprocessor controlled DAC.

A function generator is a handy piece of test equipment ... and used a piece of acrylic to protect it. The circuit inside uses a MAX038 high-frequency generator chip. This is a full-featured ...

The nice thing is, the log circuit could be pilfered and used in something else – particularly as the output is a current source. The linear brief suggests: If used in oscillator or function generator ...

The 1510A signal generator includes both charge and voltage signals to simulate a wide range of sensors and transducers. It also includes functions like adjustable frequency, multiple wave shapes, ...