Frequency component measuring device

Details Frequency component measuring device Frequency component measuring device

2007-04-26

2010-06-22

He, Amy (Department: 2831)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

C324S076190

Reexamination Certificate

active

07741831

ABSTRACT:
It is possible to provide a frequency component measuring device capable of narrowing the range of transmission frequency of a local oscillator, preventing degradation of the level measurement accuracy, and measuring the level of a modulation wave. The device includes: a local oscillator (24) capable of performing sweep in a predetermined frequency range; a mixer (22) for mixing a local oscillation signal outputted from the local oscillator (24) and a measured signal so as to subject the measured signal to a frequency conversion; a plurality of intermediate-frequency filters (44, 46) for extracting and outputting components of different intermediate frequencies from a signal outputted from the mixer (22); and an image removal processing section (66) for performing image removal according to the plurality of intermediate-frequency signals separately outputted from the intermediate-frequency filters (44, 46) corresponding to frequency sweep operations performed by the local oscillator (24) more than once.

REFERENCES:
patent: 5736845 (1998-04-01), Kosuge
patent: 6861833 (2005-03-01), Miyauchi
patent: 08-105922 (1996-04-01), None
patent: 02/29246 (2002-04-01), None

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