scanning receivers

Scanning receivers

Sagax Communications, Ltd.

Haller u. 11-13. Budapest 1096 Hungary

www.sagax.hu

Tuned center = 20MHz Tuned center = 2980MHz

0MHz 3000MHz

20MHz

20MHz

20MHz

1ms

100ms

10hps/sec FH signal

20MHz

1ms50us

Traditional receiver structure

WB IF BPF NB IF BPF

LO1

LNA MIX1 MIX2 DET

LO2

RF IN

ADC

SPECTRUMESTIMATION

Digital receiver structure

WB IF BPF Digital Signal Processor

LO1

LNA MIX1

RF IN

ADC

SPECTRUMESTIMATION

Search or band scanning

40 80 120 160 200 240 280 320 360 400

A

440 F

440

Random or memory scanning

A

40 80 120 160 200 240 280 320 360 400 F

440

Tuned receiver implementation

40 80 120 160 200 240 280 320 360 400

A

A

440

40 80 120 160 200 240 280 320 360 400

F

F

Analog Receiver tuning

Spectrum estimation

Scanning Bandwidth Scanning Resolution

440

Digital receiver implementation

40 80 120 160 200 240 280 320 360 400

A

A

440

40 80 120 160 200 240 280 320 360 400

F

F

FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT FFTFFT

Analog Receiver tuning

Spectrum estimation

Scanning Bandwidth Scanning Resolution

440

Memory scanning with digital receiver

A

40 80 120 160 200 240 280 320 360 400 F

1. General test setup

Digital Receiver

SPLIT IF

GEN#2

GEN#1 SUM RF

TUNER

DET Oscilloscope

IF

IF OutputRF Input

Device UnderTest (DUT)