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US 2003/0146743 A1Published application
Very fast swept spectrum analyzer
AssigneeAnritsu Corporation
InventorDerek Truesdale
Life of this patent
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Abstract
Analyzing a swept spectrum signal formed by mixing a ramping local oscillator and an input signal to generate an IF signal, the resulting IF signal having a phase change with respect to the input signal, the phase change including a quadratic portion. For analysis, the IF signal is processed such that the quadratic component of the phase change is removed. The quadratic component of the phase change is removed with a complex filter.
Claims8
A method of swept spectral analysis comprising the steps of:
- mixing a ramping local oscillator and an RF input signal to form an IF signal, the IF signal having a phase change with respect to the input signal, the phase change having a quadratic component;
- and
- processing the IF signal such that the quadratic component of the phase change is removed.
A swept spectral analysis system comprising:
- signal mixing circuitry configured to receive an input signal and a ramping local oscillator signal and configured to output a IF signal, the IF signal having a phase change with respect to the input signal, the phase change having a quadratic component;
- and
- conversion circuitry configured to receive and convert the IF signal into an in-phase signal and a quadrature signal, said conversion circuitry removing the quadratic phase change from the IF signal.
Dependencies are inferred from the claim text.