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stabilized GUNN power supply

Intended for Microwave GUNN oscillators, this stabilized power supply offers

output voltage 5.00V fixed
output current up too 1 Amp
voltage stability in the order of 3ppm/K
peltier controller including the external 3x3 cm Peltier element
temperature stability 10mK @ 20- 30 DegC
varactor supply and low noise amplifier delivering 20V from either a potentiometer or a differential input.

We measured Q-Band (34 to 36GHz) GUNNs with 100MHz electrical tuning range to have the following dependence

supply 5.00V with 10kHz/mV
varactor input 5 to 15V with 10kHz/mV
thermal stability at 25degC with 1kHz/mK

Now a view of the powersupply with the Gunn

Since this product is in a early product cycle, ahem post 1.prototype, there is some room for improvement on the visyual appearance.

And here a view on how the Gunn is mounted onto the Peltier
mounting the peltier and the gunn

We were able to stabilize a Q-Band GUNN with 100MHz electrical tuning range
to better than 50kHz, which is approx. 1.5 ppm.

Its price : 900CHFr @ 1 excluding VAT

being approx 600Euro (@ 1 CHFr = 0.666Euro)
being approx 750 USD (@ 1 CHFr = 0.833USD)

The next version

The next version of GUNN powersupplies has a

variable output voltage 5..8V, lower on request
Gunn operating current up too 1 Amp
voltage stability in the order of 3ppm/K
peltier controller including 3x3cm peltier element
temperature stability 10mK @ 20-30 DegC
varactor supply and low noise amplifier delivering 20V from either a potentiometer or the addition of two differential inputs.
a coarse and a fine control differential input with a ratio of 100:1
Compatibility with PLL locking counters such as 745.

Some measurements

We stabilized a wideband (2GHz) varactor tuneable Q Band GUNN doing from 34 to 36GHz between 5 and 24V. The free running behaviour was as shown here

As can be seen, the price for the extremely wide tuning range is extreme sensitivity to whatever.

The GUNN was connected to the PLL locking counter. This counter has a coarse control output from a DAC which moves the GUNN do within 5MHz from the preset frequency. The phase noise while using the coarse control input only was measured as

after connecting the fine control input then, the frequncy was locked.

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last updated 24.july.05 or perhaps later

Copyright (99,2005) Ing.Büro R.Tschaggelar