Signal Hound SM200C User Manual

Understanding the SM-series Hardware | Front End Architecture
17
3.2.2 SM435B/C
The SM435 uses the same low IF architecture as the SM200, extended to 43.5 GHz. The LO
translation loop has been improved to reduce spurious even further, and LO and RF filtering have
been added to improve spurs from LO sub-harmonics.
The SM435 contains five mixer bands covering 120 MHz to 43.5 GHz, and one direct conversion
band covering 100 kHz to 160 MHz A preselector, consisting of 23 sub-octave band pass filters,
covers 20 MHz to 43.5 GHz. Sub-harmonic responses from 8-24 GHz are reduced using sub-
octave filters for both LO and RF. From 24-43.5 GHz, sub-harmonic responses are reduced with
a bank of 7 RF filters.
The millimeter-wave downconverter in the SM435 has both IF and I/Q outputs. In the standard
unit, for frequencies below 41 GHz the I/Q output is digitized, and for frequencies above 41 GHz,
a 3 GHz IF output is downconverted and digitized.
For units with the IF output option, the SM435 may be used as a low phase noise millimeter-wave
downconverter. Instead of downconverting and digitizing the IF, it is output to the front panel. This

Signal Hound SM200C Specifications

General

Brand	Signal Hound
Model	SM200C
Category	Measuring Instruments
Language	English