JPH03131126A - Microwave signal processing circuit - Google Patents

Abstract

PURPOSE:To avoid a complicated circuit and a problem of interference between plural microwave signal transmission lines by providing a detector detecting an inputted microwave signal and a conversion circuit converting the output signal of the detector into a digital signal representing the amplitude of the microwave signal. CONSTITUTION:A microwave signal inputted to a microwave amplifier 1 is amplified up to a level which can be detected, and outputted while being divided into two signals by a distributer 2. The one output signal from the distributer 2 is distributed into a signal in-phase to an input signal from a limiter amplifier 3 and a signal with a phase shift of 90 deg. to the input signal. A phase computing element 9 outputs the phase data of a microwave signal based on a signal being an in-phase component from an A/D converter 8-1 and the signal of 90 deg. phase sifted component from an A/D converter 8-2. On the other hand, the other output signal from the distributer 2 is detected by a detector 4, sample- held by a detector 7-3, converted into a digital signal by an A/D converter 8-3 and becomes the amplitude data of the microwave signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microwave circuit, and particularly to a microwave signal processing circuit that detects the phase and amplitude of a microwave signal.

[Conventional technology]

FIG. 2 shows an example of a conventional microwave signal processing circuit.

A conventional microwave signal processing circuit has a configuration as shown in Fig. 2, in which the output signal (RF LOCAL) from the microwave local oscillator and the output signal (IF It had a signal transmission line for supplying LOCAL).

To briefly explain the circuit operation, the microwave input to the microwave amplifier 20 is amplified by the microwave amplifier 20, mixed with the RF LOCAL signal from the microwave local oscillator by the mixer 21-1, and is multiplied by the IP band. It's a signal. This TI' band signal is amplified by the IP band width amplifier 22 to a level necessary for detection, and then is converted into a signal in phase with the IF band doubled signal by the 90° hybrid coupler 23.
The signal is distributed into a signal having a phase difference of 90'' with respect to the IP band doubled signal.

Among these signals, the signal that is in phase with the IF band double signal is
IPLO from the IF band double frequency oscillator by mixer 2I-2
It is mixed with the CALP signal and subjected to phase detection, sampled and held by a sample and hold circuit (S/H) 24-1, and converted into a digital signal of the in-phase component by an A/D converter (A/D) 25-1. In addition, a signal having a phase difference of 90° with respect to the IF band doubled signal is mixed with the output signal (IP LOCAL) of the IP band frequency doubled oscillator, phase detected, and outputted by the sample and hold circuit (s/H) 24-2. Sample and hold, A/D converter (8/D) 25-2
The signal components are converted into digital signals with a phase difference of 90°.

The in-phase signal component from the A/D converter 25-1 obtained as described above and the signal component having a phase difference of 90° from the A/D converter 25-2 are processed by a phase/amplitude calculator. 26, and phase data and amplitude data are output.

[Problem to be solved by the invention]

As described above, the conventional microwave signal processing circuit has a signal transmission line for mixing the output signals of the microwave local oscillator and the IF band frequency doubler oscillator. For this reason,
In particular, when inputting signals from one local oscillator to multiple microwave circuits, the resulting signal transmission lines complicate the circuit, and interference between the multiple microwave signal transmission lines becomes a problem. There were drawbacks.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a microwave signal processing circuit which eliminates such drawbacks, has a simple circuit, and does not cause interference between microwave signal transmission lines.

[Means for Solving the Problems] The present invention includes a distributor that distributes an input microwave signal, a phase detection circuit that detects a phase from one of the microwave signals distributed by the distributor, and a phase detection circuit that detects a phase from one of the microwave signals distributed by the distributor. and an amplitude detection circuit that detects the amplitude from the other microwave signal distributed from the microwave signal, the phase detection circuit converts the input microwave signal into a microwave signal. A divider that divides signals into in-phase signals and signals with a phase difference of 90", a frequency divider that divides these signals and converts them into intermediate frequency band signals, and converts the output signal of the frequency divider into a digital signal. The amplitude detection circuit includes a conversion circuit that performs conversion, and a phase calculator that calculates phase data of the microwave signal from an output signal of the conversion circuit, and the amplitude detection circuit includes a detector that detects the input microwave signal, and a detector that detects the input microwave signal. The invention is characterized in that it has a conversion circuit that converts the output signal of the output signal into a digital signal that is amplitude data.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit block diagram showing one embodiment of the present invention.

This microwave signal processing circuit includes a microwave amplifier l, a divider 2, a limiter amplifier 3, a detector 4, and a
° Hybrid coupler 5 and frequency divider (1/N) 6-1.
6-2, a detector (S/H) 74.7-2.7-3,
It includes an A/D converter (A/D) 8-1.8-2.8-3 and a phase calculator 9. Of these parts, 90°
Hybrid power brake 51 Frequency divider 6-11 Frequency divider 6-2.
Detector 7-1. Detector? -2, A/D converter 8-1°A
The /D converter 8-21 phase calculator 9 constitutes a phase detection circuit that detects phase data of the microwave signal, and the detector 4
．． Detector? -3, A/D converter 8-3 constitutes an amplitude detection circuit that detects amplitude data of a microwave signal.

The microwave amplifier 1 amplifies the inputted micro signal to a detectable level. The divider 2 divides the microwave signal amplified by the microwave amplifier 1 into two signals and outputs the two signals.

The limiter amplifier 3 further amplifies one output signal from the distributor 2, and the 90' hybrid coupler 5 converts the input signal from the limiter amplifier 3 into a signal that is in phase with the input signal and a signal that is in phase with the input signal. and a signal having a phase difference of 90°. Frequency division Ji6-1.6-2 is 90°
The frequency of the signal distributed by the hybrid coupler 5 is divided to convert the microwave signal into an fF band multiplied signal. The frequency divider 64 converts the in-phase signal distributed by the 90° hybrid coupler 5, and the frequency divider 6-2 converts the signal with a 90° phase difference distributed by the 90° hybrid coupler 5 into an IF band multiplied signal. do. These frequency dividers 6-1 and 6-2 convert the microwave signal into an IF band double signal frequency.

The detector 7-1 samples and holds the in-phase signal from the frequency divider 6-1, and the A/D converter 8-1
Converts the signal from the microwave signal into a digital signal and supplies it to the phase calculator 9 as an in-phase component of the microwave signal.

The detector 7-2 samples and holds the signal with a 90° phase difference from the frequency divider 6-2, and the A/D converter 8-2 converts the signal from the detector 7-2 into a digital signal. It is converted and given to the phase calculator 9 as a 90° component of the micro signal.

The phase calculator 9 inputs the in-phase component of the input microwave signal from the A/D converter 8-1 and the 90° component of the microwave signal from the A/D converter 8-2, and converts the microwave signal into output as phase data.

The detector 4 detects the other output signal from the distributor 2,
The detector 7-3 samples and holds the signal from the detector 4, and the A/D converter 8-3 converts the signal from the detector 7-3 into a digital signal that provides amplitude data of the microwave signal. .

Next, the operation of this embodiment will be explained. A microwave signal input to the microwave amplifier 1 is amplified to a detectable level, divided into two signals by a distributor 2, and output.

One output signal from the divider 2 is further amplified by a limiter amplifier 3, and a 90° hybrid coupler 5 separates a signal that is in phase with the input signal from the limiter amplifier 3 and a signal that is 90° with respect to the input signal. and a signal with a phase. The in-phase signal distributed by the 90° hybrid coupler 5 is subjected to IF band double signal frequency conversion by a frequency divider 6-1, sampled and held by a detector 7-1,
The signal is converted into a digital signal by the A/D converter 8-1 and provided to the phase calculator 9 as an in-phase component of the microwave signal.

Also, 90° distributed by 90° hybrid coupler 5
The signal having a phase of is given as a 90'' phase component of the microwave signal.The phase calculator 9 then converts the A/D converter 8
Phase data of the microwave signal is output from the in-phase component signal from A/D converter 8-1 and the 90° phase component signal from A/D converter 8-2.

On the other hand, the other output signal from the distributor 2 is detected by the detector 4, sampled and held by the detector 7-3, and digitally converted by the A/D converter 8-3 to provide amplitude data of the microwave signal. Become.

As explained above, the microwave signal processing circuit of the present invention converts the microwave signal into an IF band double signal frequency using a frequency divider, so there is no need for a local oscillation signal, and a signal transmission line for inputting the local oscillation signal is not required. It is possible to remove.

〔Effect of the invention〕

As explained above, the present invention does not require a signal transmission line for inputting the output signals from the microwave local oscillator and the IF band frequency doubler oscillator, thereby eliminating the complexity of the circuit caused by the signal transmission line. There is an effect that can be done. Further, there is an effect that the problem of interference between a plurality of microwave signal transmission lines can be solved.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention; Figure 2 shows This is a diagram. 2... 4... 5... 6-1.6-2・ 7-1~7-3・ 8-1 to 8-3・ 9... tocabra Circuit diagram showing an example of conventional technology ·Distributor ・Detector ・90°hybrid ・Frequency divider ・Detector ・A/D converter ・Phase calculator

Claims (1)

[Claims] (1) a distributor that distributes the input microwave signal;
A microwave signal processing circuit comprising a phase detection circuit that detects the phase from one microwave signal distributed by the distributor, and an amplitude detection circuit that detects the amplitude from the other microwave signal distributed by the distributor. The phase detection circuit includes a divider that divides the input microwave signal into a signal that is in phase with the microwave signal and a signal that has a phase difference of 90 degrees, and a divider that divides these signals, respectively. a frequency divider that converts the signal into an intermediate frequency band signal, a conversion circuit that converts the output signal of the frequency divider into a digital signal, and a phase calculator that calculates phase data of the microwave signal from the output signal of the conversion circuit. A microwave signal, wherein the amplitude detection circuit includes a detector that detects the input microwave signal, and a conversion circuit that converts the output signal of the detector into a digital signal that is amplitude data. processing circuit.