Dear experts,
to design a suitable radar modulation I increase the idle time to a few hundreds microseconds while the ramp end time is about 50us. Does a longer idle time deteriorate coherency between the chirps in one frame?
What happens to the VCO during the idle time? Is it oscillating with the PLL locked?
Thanks,
Timofey
Timofey,
Typically, longer idle time within the frame should not deteriorate the coherency chirps in a frame.
However, mmWave sensors have power saving features where during inter-chirp IDLE times by turning off various circuits e.g. TX, RX, LO Distribution blocks. This is controlled by Dynamic power saving APIs (As shown below in the mmWave link API), By default this feature is enabled.
In this API you could individually power down Transmitter, Receiver and LO distribution stages during the inter chirp IDLE period.
You may want to disable this power dynamic power saving mode, this might improve the coherency of the chirps.
Thanks and regards,
CHETHAN KUMAR Y.B.
