Digital pulse compression module

CI E03

March 15

CI E03 Revision A3

3 / 11

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Waveforms

DAC

Timing

EXP_SELECT

RFOUT

TRIG

CLOCK

Fig. 3 : Expander channel bloc diagram

Compressor, featured in Fig. 4, uses a FIR filter whose coefficients are matched to the expander waveform

samples. Input data are preliminary translated into baseband, and then are translated again into IF signal. Digital

IF signal is then presented to the DAC to be translated into an analog IF signal.

For better compatibility with old SAW based subsystems, an adjustable additional delay may be inserted.

RF IN

ADC

To

ba seba nd

FIR

To

F0

DA C

RF OUT

Timing

OS C

Fig. 4 : Compressor channel bloc diagram

Fig. 5 represents the maximum time dispersion vs. bandwidth area covered with one and two concurrent

compressor channels operating. These areas assume 250 MHz internal clock, and a compressor sample period of

Fig. 5 : Maximum Time dispersion vs. Bandwidth