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71-76 GHz Frequency Synthesizer for ODMR Spectrometer

 

ELVA-1 has designed and shipped 71-76 GHz Synthesizer for ODMR Spectrometer at Ioffe Institute (http://www.ioffe.ru/index_en.html).  This Frequency Synthesizer is installed within research equipment at Optics of Semiconductors Lab.

At Joffe Institute, using the phenomenon of optically detected magnetic resonance (ODMR), scientists study the behavior of magnetic nanostructures, such as quantum dots and quantum wells. While irradiating nanostructure samples using microwave signal from the 71-76 GHz Frequency Synthesizer the researchers activate spin phenomena in semiconductors including diluted magnetic semiconductors and semiconductor nanostructures, thereby speeding up experiments. The nanostructure sample is placed into helium cryostat at temperatures close to absolute zero. See block diagram of research bed for understanding of 71-76 GHz Frequency Synthesizer role (marked as MWG).



 


The study is being conducted in order to create memory elements for quantum computers. The development of quantum (optical) computer is a mega-project, which a lot of laboratories around the world work on. The goal is to develop a supercomputer of the future with enormous speed at a micro size. 71-76 GHz Frequency Synthesizer is intended for the continuous generation of the harmonic signals in the range 71-76GHz and can operate in the following modes:

• «CONTINUOUS WAVE» (CW) - continuous generation mode of reference frequency signal;
• «CONTINUOUS WAVE» (CW) - continuous generation mode of reference frequency signal with amplitude modulation;
• «FREQUENCY SWEEP»  (FS) - sweep mode generator (sweeper).


 

The synthesizer has built-in keyboard for direct input of the output frequency settings on the front panel. It is also equipped with 2-line LCD display, which displays information about the frequency and other signal parameters. Built-in USB-HID interface allows remote computer-aided device control. «71-76GHz Synthesizer remote control» software is included into shipment for this purpose.

71-76 GHz Frequency Synthesizer Specifications:


Parameter
Value
General Specs
1 Frequency range 
71 - 76 GHz
2 Frequency Resolution
0.1 MHz
3 The highest output power level
20 dBm
4 Settings for power level range attenuation
0 - 35 dB 
5 Resolution of output power attenuation
0.5 dB
6 The output waveguide flange
20x20 mm 
7 The output waveguide channel
3.6x1.8 mm (4)
8 Remote Management Interface
USB-HID
9 LED LCD display modes
Monochrome 2-line LCD
10 Power supply
24 V (DC), 20 W
11 Operating temperature range
+100C … +500C
12 Dimensions
137х210х210 mm
13 Net Weight
3.3 kg
Frequency Sweep Specs
1 Sweep mode
Linear
2 Radio pulse duration
1 ms
3 The repetition period of radio pulses of
2 ms
4 Step tuning frequency
0.1 MHz
5 Start Mode
manual / external trigger mode
(On the rising edge
of external trigger pulse)
6 External trigger input
BNC connector ( Female socket )
7 The level of the external trigger pulse
3.3V CMOS (5 max.)
8 The synchronization mode
on the rising edge
of the synchronization puls
9 Pulse output connector sync
BNC connector ( Female socket )
10 Sync pulse level
3.3V CMOS
11 The pulse duration of synchronization
1 ms
12 The duration of the pulse rising edge of the synchronization
not more than 3 ms
Amplitude Modulation Specs
1 Amplitude modulation input connector
BNC connector ( Female socket )
2 Amplitude modulation signal level
3.3 V LVTTL
3 Amplitude modulation signal frequency
not less than 100 kHz
4 Rise time of generated radio pulse
less than 8.0 ns
Built-in through-0ut Amplifier Specs
1 The bandwidth of the amplifier
DC - 500 MHz
2 The voltage gain of the amplifier
3
3 Input / Output impedance of the amplifier
50 ohm
4 Input / Output Amplifier sockets
SMA


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