Instructor: Yossi HipshStudent: Boaz Hanina

High Speed Digital Systems LabElectrical Engineering

Technion

Midway presentation Summer 2010

Quad Carrier Wave Source

Table Of Contents• System Block Diagram • VCO As A Multiple Signal Oscillator• 4 to 1 Power Combiner• System Layout• System Practical Operation – room 319• “To do” List• Gantt

System block diagram

F1

F2

F3

F4

Power CombinerMini CircuitsZN4PD1-50+

OUT

VCO1ADF-4350

USB

EVB(Evaluation Board)

VCO2ADF-4350

USB

EVB(Evaluation Board)

ff1

ff2

ff3

f4

f

f4 ff3f2f1

VCO As A Multiple Signal Oscillator• The VCO is able to produce 1 - 4.4 GHz signal

• Signal A – VCO output divided by 1/2/4/8/16 Signal B – the VCO output

VCO signal

VCO signal after division

VCO As A Multiple Signal Oscillator2 VCO’s produces 4 signals -

Signal B

Signal A

Signal C Signal D

VCO2VCO1

High Speed Power Combiner• Bandwidth - 0.5 to 5 GHz

• 4 to 1 combiner

• High isolation – 23db typical value

• Insertion loss - input delta (db)

0.5G 0.01G 1.5

1.5G 0.52G 0.6

2.5G 1.33G 1.5

3.5G 0.94G 1.9

4.4G 1.2

2 2

2

2

,

10 log

in outin out

out out

in in

V VP PR R

P V dbP V

System Layout

System Output

Power in

USB-1

USB-2

System practical operation4 output frequencies – 1.6, 2, 3.2 and 4GHz

1.6GHzFirst harmony

1.6GHzSecond harmony

2GHzSecond harmony

2GHzFirst harmony

3.2GHzFirst harmony

4GHzFirst harmony

System practical operation

VCO1 – 1.6 and 3.2GHzVCO2 – 2 and 4GHz

“To do” list

•System mechanical assembly•VCO Signal spectrum analysis using spectrum analyzer.

•System output signal spectrum analysis using spectrum analyzer.

•User manual.

VCO Signal spectrum analysis• The VCO is the oscillator of the system.

• Since the scope bandwidth is Limited, We can’t get the “real” signal spectrum.

• Target - determine the quality of the square wave using spectrum analyzer.

0 1 2 3 4 5 6 7 8 9 10x 109

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1FFT of 1GHz squre wave (50% duty cycle)

Frequency (Hz)

Y(f

)|

System Signal spectrum analysis

• The scope is not enough to determine the signal quality.

• Characterize the system output signal using spectrum analyzer.

Gantt