ADF4159 datasheet(34/36 Pages) AD

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ADF4159

Data Sheet

Rev. B | Page 34 of 36

APPLICATION OF THE ADF4159 IN FMCW RADAR

Figure 54 shows the application of the ADF4159 in a frequency

modulated continuous wave (FMCW) radar system. In the FMCW

radar system, the ADF4159 is used to generate the sawtooth or

triangle ramps that are necessary for this type of radar to operate.

Traditionally, the PLL was driven directly by a direct digital

synthesizer (DDS) to generate the required type of waveform. Due

to the waveform generating mechanism that is implemented on

the ADF4159, a DDS is no longer needed, which reduces cost.

The PLL solution also has advantages over another method for

generating FMCW ramps: a DAC driving the VCO directly; this

method suffers from nonlinearities of the VCO tuning character-

istics, requiring compensation. The PLL method produces highly

linear ramps without the need for calibration.

ADSP-BF531

AD8283

ADC

10 BITS TO

12 BITS

16 BITS

MULT ×2

ADF4159

VCO

BASEBAND

REFERENCE

OSCILLATOR

HPF

MUX

×2

NO DDS REQUIRED

WITH ADF4159

LINEAR

FREQUENCY

SWEEP

MICRO-

CONTROLLER

DSP

BUS

CAN/FLEXRAY

FREQUENCY MODULATED CONTINUOUS WAVE

LONG RANGE RADAR

RANGE

COMPENSATION

MIXER

ANTENNA

ANTENNAS

Figure 54. FMCW Radar with the ADF4159

ADF4159 Datasheet(PDF) 34 Page - Analog Devices

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