DWM3000 Datasheet

© Qorvo 2020

Preliminary

Version 0.1

Page 10

Depending on the end-use applications and the system design, DWM3000 settings may need to be tuned. To

help with this tuning a number of built in functions such as continuous wave TX and continuous frame

transmission can be enabled. See the DW3000 user manual for further details.

The DWM3000 has crystal oscillator trimmed during module production but no transmit power or antenna delay

calibration.

2.1.1 Crystal Oscillator Trim

DWM3000 modules are calibrated at production at room temperature to minimise initial frequency error to reduce

carrier frequency offset between modules and thus improve receiver sensitivity. The calibration carried out at

module production will trim the initial frequency offset to less than 2 ppm, typically.

2.1.2 Transmitter Calibration

In order to maximise range, DWM3000 transmit power spectral density (PSD) should be set to the maximum

allowable for the geographic region in which it will be used. For most regions this is -41.3 dBm/MHz.

As the module contains an integrated antenna, the transmit power can only be measured over the air. The

Effective Isotropic Radiated Power (EIRP) must be measured and the power level adjusted to ensure compliance

with applicable regulations.

The DWM3000 provides the facility to adjust the transmit power in coarse and fine steps; 2 dB and 0.5 dB

nominally. It also provides the ability to adjust the spectral bandwidth. These adjustments can be used to

maximise transmit power whilst meeting regulatory spectral mask.

If required, transmit calibration should be carried out on a per DWM3000 module basis, see DW3000 user

manual for full details.

2.1.3 Antenna Delay Calibration

In order to measure range accurately, precise calculation of timestamps is required. To do this the antenna delay

must be known. The DWM3000 allows this delay to be calibrated and provides the facility to compensate for

delays introduced by PCB, external components, antenna and internal DWM3000 delays.

To calibrate the antenna delay, range is measured at a known distance using two DWM3000 systems. Antenna

delay is adjusted until the known distance and reported range agree. The antenna delay can be stored in OTP

memory.

Antenna delay calibration must be carried out as a once off measurement for each DWM3000 design

implementation. If required, for greater accuracy, antenna delay calibration should be carried out on a per

DWM3000 module basis, see DW3000 user manual for full details.