A121 Pulsed Coherent Radar (PCR)

Datasheet v1.0

© 2023 Copyright by Acconeer

2023-03-30

Page 20 of 29

6.5 VDIG power Supply

The A121 power domain “VDIG” is sensitive to power supply ripple which may result in performance

degradation. Table 14 provides the power supply ripple specification for VDIG.

Frequency (Hz)

Min.

Typ.

Max.

Unit

10 000

25

mVpp

100 000

25

mVpp

1 000 000

25

mVpp

4

 000 000

25

mVpp

Table 14. Power supply ripple specification for VDIG.

If the VDIG voltage source violates the power supply ripple specification, an LC filter as displayed in

Figure 6.5 can be used. This filter has a cut-off frequency of 30 kHz. The exact values for the LC filter

depend on the frequency and amplitude of the ripple. Be aware of the LC filter peaking at the series

resonance frequency f=1/(2π

√������������). A small snubber resistor, 250 mΩ in the example filter, can be

inserted to lower the Q factor.

Figure 6.5. LC supply filter.