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US 6,888,342 B2Granted
Spectrum analyzer and vector network analyzer combined into a single handheld unit
AssigneeAnritsu Corporation
InventorDonald A. Bradley
Life of this patent
Estimating the term…
Abstract
A spectrum analyzer is combined with the VNA in a housing measuring approximately 4 pounds with the spectrum analyzer portion operating from slightly above DC to above 3.0 GHz. The components for the spectrum analyzer are provided on a separate printed circuit board from the two printed circuit boards for the display and VNA components in the housing. The design of components for the printed circuit board enable a significant reduction of size from a typical spectrum analyzer which weighs 40 pounds or more and measures on the order of 2 feet by 3 feet by 0.5 feet.
Claims8
An apparatus comprising:
- a housing;
- and
- a spectrum analyzer having components provided on a PC board contained within the housing, the spectrum analyzer components comprising:
- a first voltage controlled oscillator (VCO)(404) operating over a first frequency range having an output;
- a second VCO (406) operating over a second frequency range different from the first frequency range having an output;
- a signal combiner (411) having a first input coupled to the first VCO, a second input coupled to the second VCO and an output;
- a signal divider (413) having an input coupled to the output of the signal combiner, a first output and a second output;
- a first switch (405) having a common terminal providing a signal input to the spectrum analyzer, a first switching terminal for coupling to a low band path, and a second switching terminal for coupling to a high band path;
- a first mixer (440) having a first input coupled to the first output of the signal divider, a second input coupled to the low band path, and having an output;
- a second mixer (442) having a first input coupled to the second output of the signal divider, a second input coupled to the high band path, and having an output;
- a first bandpass filter (444) having an input coupled to the output of the first mixer and having an output;
- a second bandpass filter (446) having an input coupled to the output of the second mixer and an output;
- a second switch (447) having a first switching terminal coupled to the output of the first bandpass filter, a second switching terminal coupled to the output of the second bandpass filter, and having a common terminal;
- a first baseband downconverter having an input coupled to the common terminal of the second switch and having an output;
- a second baseband downconverter having an input coupled to the output of the first baseband downconverter and having an output;
- and
- an A/D converter (570) having an input coupled to the output of the second downconverter and an output for providing an output from the spectrum analyzer.
14 more elements
An input signal attenuators for a spectrum analyzer comprising:
- relay based attenuators (500, 508, 510) coupled in series between the input of the spectrum analyzer and a first frequency converter, the relay based attenuators each comprising:
- a first switch having a common terminal forming the input of the relay based attenuator, a first switching terminal and a second switching terminal;
- a second switch having a common terminal forming the output of the relay based attenuator, a first switching terminal and a second switching terminal;
- a through line coupled between the first switching terminals of the first and second switches;
- and
- an attenuator coupled between the second switching terminals of the first and second switches;
- a limiter (502) comprising:
- a diode having a first terminal coupled to the input of the spectrum analyzer, and a second terminal;
- a limiter switch having a common terminal coupled to the second terminal of the diode, a first switching terminal coupled to a first voltage potential, and a second switching terminal coupled to a second voltage potential offset from the first voltage potential;
- and
- a DC blocking capacitor (512) coupled between the input of the spectrum analyzer and the converter.
8 more elements
Resolution bandwidth filters for a spectrum analyzer, the resolution bandpass filters comprising:
- a first filter switch (596) having a common terminal coupled to an output of a baseband downconverter, a first switching terminal and a second switching terminal;
- a second filter switch (597) having a common terminal coupled to an A/D converter, a first switching terminal and a second switching terminal;
- a first crystal filter (593) coupled between the first switching terminals of the first and second filter switches;
- and
- a second crystal filter (594) coupled between the second switching terminals of the first and second filter switches, the first and second crystal filters being included on a single integrated circuit chip.
2 more elements
Dependencies are inferred from the claim text.