Analog Discovery 2: Idle voltage level during delay time with continuous sweeps

[longboard]

Hello,

I have configured my Analog Discovery 2 device to generate a continuous sinusoidal FM sweep spanning a set amount of time followed by a fixed delay time where I want the output to be at ground, then the pattern repeats. I have the 'idle' control set to 'offset' and the 'offset' value is set to 0V. However the sweep then extends both positive and negative with respect to ground in this configuration. For my application however, I only want a positive voltage sweep with the signal returning to ground during the delay time. I have experimented with adding an offset voltage to make the sweep be a positive value. This however then creates a problem with the 'idle' voltage during the delay, which stays at a fixed positive voltage instead of being at ground. Aside from adding a DC block capacitor in hardware, I don't know how to resolve this via a configuration setting for my Analog Discovery 2 unit. I appreciate any suggestions. 

Thank you

Sean

[attila]

Hi @longboard

Use idle:initial, offset=amplitude, phase:270

[longboard]

Thank you very much. Your suggestion is working very well and producing the amplitude swing above ground with my sweeps.

Sean