Teardown and tests of Hittite 10 MHz - 20 GHz signal source


RF sources are common building block in today’s connected world. They are available in wide array of frequency ranges, power levels, form-factor and type. In this article we will take a brief look on benchtop RF source, designed to provide clean signal from 10 MHz to 20000 MHz with output levels over +20 dBm. It is lightweight half-rack size instrument with simple encoder control, 16×2 LCD and SMA output connector. There is RF output toggle switch and a power switch.

It features the following performance parameters:

Parameter Value Unit
Frequency range 10 – 20000 MHz
Phase Noise -98 dBc/Hz 10 kHz Offset @ 10 GHz
Setting resolution from front panel 10000 Hz
Setting resolution from GPIB 1 Hz
Power output -35.0 to +26.0* (depends on Fout) dBm
Power stability ±2 dBm
Stability 1.5 ppm/year
Aux signals Trigger in/out, Reference Clock In/Out 10MHz
Interfaces RS232, USB, GPIB
Min operational temperature -10 °C
Max operational temperature +80 °C
Power supply External, +12V 8A rating

Table 1. HMC-T2220 specifications


Redistribution and use of this article, any part of it or any images or files referenced in it, in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of article must retain the above copyright notice, this list of conditions, link to this page (https://xdevs.com/article/hmc2220/) and the following disclaimer.
  • Redistributions of files in binary form must reproduce the above copyright notice, this list of conditions, link to this page (https://xdevs.com/article/hmc2220/), and the following disclaimer in the documentation and/or other materials provided with the distribution, for example Readme file.

All information posted here is hosted just for education purposes and provided AS IS. In no event shall the author, xDevs.com site, or any other 3rd party be liable for any special, direct, indirect, or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortuous action, arising out of or in connection with the use or performance of information published here.

If you willing to contribute or add your experience regarding instrument repairs or provide extra information, you can do so following these simple instructions.

Teardown of HMC-T2220 RF source.

After little tracing for input power connector, RF source was powered up from trusty HP 6653A DC power supply. While sourcing 20 GHz -20 dBm it was consuming around 25W (+12V 2.1A).

EIP 578B counter was used to measure output of the HMC-T2220. To avoid overloading counter input source was limited to -20 dBm power. Counter was also configured to use external 10 MHz reference clock, sourced from RF source as well.

Author: Ilya Tsemenko
Created: March 23, 2022, 5:15 a.m.
Modified: Jan. 2, 2023, 8:35 a.m.