JPH074601Y2 - Network spectrum analyzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a network spectrum analyzer capable of measuring frequency characteristics of a measurement target having a nonlinear input / output characteristic.

<Prior Art> FIG. 4 is a block diagram showing an example of a conventionally used network analyzer. This analyzer comprises an oscillator 1, a bandpass filter 2, and a frequency setter (for example, a sawtooth oscillator) 3 for sweeping the oscillation frequency of the oscillator 1 and for sweeping the passband of the bandpass filter 2 in synchronization with the sweep. ing.

Reference numeral 4 denotes a measurement target having a nonlinear input / output characteristic such as a magnetostatic wave delay element, and the figure shows a state in which the insertion loss of power with respect to the input frequency of the measurement target is measured.

In the figure, the frequency and the wavelength of power A shown in (1) are input from the oscillator 1 to the measurement target 4 via the port 1. The signal passing through this measurement object is distorted and its power is attenuated. This signal is taken into the analyzer through the port 2 and passed through a bandpass filter having a frequency and a transmittance shown in C, and a signal having a B power as shown in B can be obtained. By sweeping the pass band of this band pass filter and sequentially calculating the ratio of the power of B and the power of A, the insertion loss for each input frequency as shown in FIG. 5 can be measured.

FIG. 6 shows a state in which the frequency output from the oscillator 1 is input to the measurement target (magnetostatic wave delay element) 4, the output is input to the spectrum analyzer, and the output characteristic is measured. According to this structure, when a pure signal (state in which only one spectrum is emitted) as shown in FIG. 7 is input from the oscillator 1, the output of the magnetostatic wave delay element is displayed on the CRT of the analyzer. You can

FIG. 8 shows a signal which has passed through the magnetostatic wave delay element on a CRT and shows that noise is generated before and after the input frequency.

<Problems to be Solved by the Invention> However, in the conventional network analyzer shown in FIG. 4, the relationship between frequency and insertion loss can be measured, but the degree of distortion of a pure signal cannot be measured. However, the conventional example shown in FIG. 6 has a problem that the characteristic of the measurement target cannot be detected while continuously sweeping the frequency of the oscillator.

The present invention has been made in view of the above problems of the prior art.
It is an object of the present invention to provide a network spectrum analyzer that can detect the characteristics of a measurement target while continuously sweeping the frequency of the oscillator.

<Means for Solving the Problems> The configuration of the present invention for solving the above problems has an oscillator capable of sweeping frequency and power in steps and a nonlinear input / output characteristic for inputting the output of the oscillator. It consists of a measurement target and a spectrum analyzer to which the output from the measurement target is input. The frequency and power from the oscillator are changed in steps, and the frequency spectrum of the measurement target and power distortion at a predetermined frequency are detected. It is characterized by doing so.

<Embodiment> The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment in which the frequency spectrum of a measurement target (element having nonlinear input / output) is detected by the network analyzer of the present invention. In the figure, the difference from FIG. 4 is that the spectrum analyzer shown in FIG. 6 is used instead of the bandpass filter. That is, when the frequency spectrum is detected in the present invention, the output signal of the oscillator 1 is generated by the signal from the frequency setting device 3 as shown in FIG.
z is changed in 0.1 GHz steps, the output is input to the measurement target 4, and the output signal from the measurement target is input to the spectrum analyzer 10.

In the above configuration, if the frequency setting signal is slowly changed stepwise and the center frequency of the CRT of the spectrum analyzer is set in synchronization with the frequency of the oscillator, the frequency spectrum of the measurement object is displayed sequentially on the CRT of the spectrum analyzer. You can

FIG. 3 shows an embodiment in which the frequency of the oscillator 1 is fixed and the power of the oscillator 1 is changed by the power setting device. In this example, a constant frequency is input to the measurement target. , The output from this measurement target is input to the spectrum analyzer. With such a configuration, if the power setting signal is slowly swept in steps, it is possible to detect what power and how much distortion occurs.

<Effects of the Invention> As described above in detail with the embodiments, according to the present invention, it is possible to continuously detect the degree of change in the input frequency passing through the measurement target, and for example, saturation of the magnetostatic wave delay element It is possible to realize a network spectrum analyzer capable of analyzing phenomena.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment for detecting a frequency spectrum to be measured by a network analyzer of the present invention, FIG. 2 is a diagram showing frequency output from a transmitter, and FIG.
FIG. 4 is a configuration diagram showing an embodiment in which the frequency of the oscillator is fixed and the power of the oscillator is changed by a power setting device. FIG. 4 is a diagram showing the configuration of a conventional network analyzer. Fig. 6 shows the relationship between frequency and insertion loss. Fig. 6 is a block diagram showing the state where the frequency characteristics of the measurement target are being measured using a conventional spectrum analyzer. Fig. 7 is a diagram showing the frequency characteristics of the oscillator. , FIG. 8 is a diagram showing frequency characteristics from the measurement object. 1 …… Oscillator, 3 …… Frequency setter, 4 …… Measurement target (magnetostatic wave delay element), 10; Spectrum analyzer, 11 …… Power setter.

Claims (1)

[Scope of utility model registration request] 1. An oscillator comprising a stepwise sweep of frequency and power, a measuring object having a nonlinear input / output characteristic for inputting the output of the oscillator, and a spectrum analyzer for inputting the output from the measuring object. A network spectrum analyzer characterized in that the frequency and power from the oscillator are changed in steps to detect the frequency spectrum of the measurement target and the distortion of power at a predetermined frequency.