WO2006059367A1

WO2006059367A1 - Pulse modulator circuit

Info

Publication number: WO2006059367A1
Application number: PCT/JP2004/017775
Authority: WO
Inventors: Kenji Kawakami; Masayoshi Ono; Satoshi Hamano; Moriyasu Miyazaki
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2004-11-30
Filing date: 2004-11-30
Publication date: 2006-06-08
Also published as: JPWO2006059367A1; JP4495169B2

Abstract

A pulse modulator circuit comprising a pulse modulation mixer that receives a local oscillating wave and a first pulse wave and mixes a 2n multiple of the local oscillating wave (where n is an integer) with the first pulse wave to output an RF pulse signal; and a switch circuit connected to the RF terminal of the pulse modulation mixer and turned on/off by a second pulse wave to pass the power (RF pulse signal); wherein the pulse width of the second pulse wave is longer than that of the first pulse wave, and when the first pulse wave is on, the second pulse wave is also on.

Description

Specification

Pulse modulation circuit

Technical field

The present invention relates to a pulse modulation circuit used for a communication device or a radar.

In particular, the present invention relates to a pulse modulation circuit that changes the timing and width of two pulses in a pulse modulation circuit using a harmonic mixer.

Background art

[0002] As a modulation circuit used in a conventional Nordic Doppler radar device for automobiles, there is a modulation circuit using a mono-monic mixer for the purpose of suppressing load fluctuation of an oscillator during a switch operation. In a harmonic mixer using an anti-parallel diode pair, an RF pulse signal having a frequency 2n times the local oscillation wave (LO) can be output by applying a DC pulse signal instead of IF (for example, (See Patent Document 1).

[0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2000-338233

Disclosure of the invention

Problems to be solved by the invention

[0004] In the case of the conventional pulse modulation circuit described above, the ONZOFF ratio of the output power during the switch operation is at most about 25 to 40 dB, although it depends on the DC characteristics of the diode. In the case of short pulse systems such as recent UWB (Ultra Wide Band) communications and radar, the ONZOFF ratio needs to be 60-80 dB, and a pulse circuit must be added. However, when a switch circuit using only active elements is provided, the frequency component of the pulse becomes a high-frequency region as the pulse width of the driving pulse becomes shorter, and the main line and pulse signal through which the RF signal and local oscillation wave pass. There was a problem that it was difficult to demultiplex (filtering) the supply line.

[0005] The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the ONZOFF ratio of the output power during the switch operation, and to supply the main line and the pulse signal. Therefore, it is possible to obtain a pulse modulation circuit capable of easily demultiplexing (filtering) the transmission line. Means for solving the problem

[0006] A pulse modulation circuit according to the present invention includes a pulse modulation mixer that outputs an RF pulse signal by mixing a 2n harmonic wave of a local oscillation wave and a first pulse signal, and outputs the RF pulse signal to a second pulse signal. A switch circuit that is turned on / off by a pulse signal, and when the pulse width of the second pulse signal is longer than the pulse width of the first pulse signal and the first pulse signal is on, the second pulse signal is turned on. The noise signal is also turned on.

The invention's effect

The pulse modulation circuit according to the present invention can improve the ONZOFF ratio of the output power during the switch operation, and can easily demultiplex (filter) the main line and the line for supplying the pulse signal. There is an effect that can be done.

Brief Description of Drawings

FIG. 1 is a circuit diagram showing a configuration of a pulse modulation circuit according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing an operation of the pulse modulation circuit according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an operation of the pulse modulation circuit according to the first embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a pulse modulation circuit according to Embodiment 2 of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a pulse modulation circuit according to Embodiment 3 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

In the first embodiment, the switch circuit 2 is provided at the RF terminal of the pulse modulation mixer 1. In the second embodiment, the switch circuit 2 is provided at the local oscillation wave input terminal of the pulse modulation mixer 1. Further, in the third embodiment, the switch circuit 2a is provided at the local oscillation wave input terminal of the pulse modulation mixer 1, and the switch circuit 2b is provided at the RF terminal of the pulse modulation mixer 1.

Example 1

A pulse modulation circuit according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a circuit diagram showing a configuration of a pulse modulation circuit according to Embodiment 1 of the present invention. In addition, in each figure, the same code | symbol shows the same or equivalent part.

In FIG. 1, the pulse modulation circuit according to the first embodiment includes a local oscillation wave and a first pulse. A pulse modulation mixer 1 that inputs a wave and mixes the 2n (n: integer) multiple of the local oscillation wave with the first pulse wave to output an RF pulse signal, and the RF of this pulse modulation mixer 1 A switch circuit 2 connected to the terminal and for turning on and off the passing power with the second pulse wave is provided.

[0012] A pulse input terminal 3 and a local oscillation power input terminal 4 are connected to the pulse modulation mixer 1. The switch circuit 2 is connected to a pulse input terminal 5 and an RF output terminal 6.

Next, the operation of the pulse modulation circuit according to the first embodiment will be described with reference to the drawings. 2 and 3 are diagrams showing the operation of the pulse modulation circuit according to Embodiment 1 of the present invention.

A first pulse wave power having a pulse width A is inputted from the pulse input terminal 3 of the pulse modulation mixer 1. Next, it is inputted from the pulse input terminal 5 of the second pulse wave power switch circuit 2 having the pulse width B.

As shown in FIG. 2, when the switch circuit 2 is not provided, leakage power is generated in portions other than the pulse width A. In addition, the power at the time of turning off the mixer 1 is output to the center frequency of the output spectrum.

On the other hand, as shown in FIG. 3, when the switch circuit 2 is inserted, the second pulse wave having the pulse width B is input so as to include the first pulse wave having the pulse width A. As a result, the above leakage power is multiplied by (pulse width B) Z (pulse interval C), and the leakage power can be suppressed.

[0017] When an amplifier using an active element or a switch is provided in the part of the switch circuit 2, the frequency component of the pulse becomes a high frequency region as the pulse width of the driving pulse becomes shorter. There is a problem that it is difficult to separate (filter) the main line through which RF signals and local oscillation waves pass and the line for supplying pulse signals.

[0018] However, by using the configuration of the first embodiment, the first pulse wave having a desired pulse width A is modulated by the pulse modulation mixer 1, and the switch circuit 2 is longer than the pulse width A and is arbitrarily set. Since it is driven by the second pulse wave with a pulse width B, there is an advantage that the above demultiplexing (filtering) can be performed easily.

That is, the pulse modulation circuit according to the first embodiment includes the local oscillation wave and the first pulse signal ( The first pulse wave), the 2n harmonic of the local oscillation wave and the first pulse signal are mixed to output the RF pulse signal, and to the RF terminal of the pulse modulation mixer 1 And a switch circuit 2 that turns on and off the passing power with the second pulse signal (second pulse wave), and the pulse width B of the second pulse signal is longer than the pulse width A of the first pulse signal. The second pulse signal is also on when the first noise signal is on.

Example 2

A pulse modulation circuit according to Embodiment 2 of the present invention will be described with reference to FIG.

In FIG. 4, the pulse modulation circuit according to the second embodiment receives a local oscillation wave and a first pulse wave, and 2n (n: integer) double wave of the local oscillation wave and the first pulse wave. A pulse modulation mixer 1 that outputs an RF pulse signal and a switch circuit 2 that connects to the local oscillation wave input terminal of the pulse modulation mixer 1 and turns on and off the passing power with the second pulse wave. Is provided.

[0022] A pulse input terminal 3 and an RF output terminal 6 are connected to the noise modulation mixer 1. Further, the local oscillation power input terminal 4 and the pulse input terminal 5 are connected to the switch circuit 2.

[0023] Next, the operation of the pulse modulation circuit according to the second embodiment will be described with reference to the drawings.

[0024] The basic operation and effects of the second embodiment are the same as those of the first embodiment. Compared to the first embodiment, a higher effect is obtained by connecting the switch circuit 2 to the local oscillation wave input terminal side of the pulse modulation mixer 1.

Since this pulse modulation mixer 1 is a harmonic mixer, the frequency obtained at the RF output terminal 6 is 2n times the local oscillation wave. Therefore, if the local oscillation power is reduced by ldB, the output power of 2n times the frequency will be reduced by 2ndB. For this reason, an on / off ratio 2n times the on / off ratio in the switch circuit 2 can be obtained at the RF output terminal 6, and the leakage power can be further suppressed. In addition, since the switch circuit 2 may have a desired RF frequency of lZ2n, it is more secure when configured with discrete components. It can be realized at a reasonable price.

That is, the pulse modulation circuit according to the second embodiment receives the local oscillation wave and the first pulse signal (first pulse wave), and outputs the 2n harmonic wave of the local oscillation wave and the first pulse signal. Is connected to the local oscillation wave input terminal of the pulse modulation mixer 1 that outputs an RF pulse signal and the pulse modulation mixer 1 is turned on and off with the second pulse signal (second pulse wave) Switch circuit 2, and when the pulse width B of the second pulse signal is longer than the pulse width A of the first pulse signal and the first pulse signal is on, the second pulse signal is also on. It is characterized by being.

Example 3

A pulse modulation circuit according to Embodiment 3 of the present invention will be described with reference to FIG.

In FIG. 5, the pulse modulation circuit according to the third embodiment receives a local oscillation wave and a first pulse wave, and 2n (n: integer) double wave of the local oscillation wave and the first pulse wave A pulse modulation mixer 1 that outputs an RF pulse signal and a switch circuit 2a that connects to the local oscillation wave input terminal of this pulse modulation mixer 1 and turns on and off the passing power with the second pulse wave. A switch circuit 2b is provided which is connected to the RF terminal of the pulse modulation mixer 1 and which turns on and off the passing power with the second pulse wave.

[0029] A pulse input terminal 3 is connected to the mixer 1 for pulse modulation. Further, the local oscillation power input terminal 4 and the pulse input terminal 5a are connected to the switch circuit 2a. Furthermore, a pulse input terminal 5b and an RF output terminal 6 are connected to the switch circuit 2b.

[0030] Next, the operation of the pulse modulation circuit according to the third embodiment will be described with reference to the drawings.

[0031] The basic operation and effects of the third embodiment are the same as those of the first and second embodiments. Compared to the first and second embodiments, the higher effect is obtained by connecting the switch circuits 2a and 2b to both the local oscillation wave input terminal side and the RF terminal side of the pulse modulation mixer 1.

[0032] Since this pulse modulation mixer 1 is a harmonic mixer, the frequency obtained at the RF output terminal 6 is 2n times the local oscillation wave. Therefore, the local oscillation power is ldB When it falls, the output power of 2n times the frequency drops by 2ndB. For this reason, the on / off ratio of the switch circuit 2b connected to the RF terminal side can be obtained at the RF output terminal 6 in addition to the on / off ratio of 2n times the on / off ratio in the switch circuit 2a, and the leakage power is further increased. It becomes possible to suppress.

That is, the pulse modulation circuit according to the third embodiment inputs the local oscillation wave and the first pulse signal (first pulse wave), and mixes the 2n harmonic of the local oscillation wave and the first pulse signal. The pulse modulation mixer 1 that outputs an RF pulse signal and the local oscillation wave input terminal of the pulse modulation mixer 1 are connected to the switch circuit 2a. The switch circuit 2a turns on and off the passing power with the second pulse signal (second pulse wave). And a switch circuit 2b that is connected to the RF terminal of the pulse modulation mixer 1 to turn on and off the passing power with the second pulse signal (second pulse wave), and the pulse width B of the second pulse signal is the first When the first pulse signal is longer than the pulse width A of the first pulse signal and the first pulse signal is on, the second noise signal is also on.

Claims

The scope of the claims

[1] A pulse modulation mixer that outputs an RF pulse signal by mixing the 2n harmonic of the local oscillation wave and the first pulse signal;

A switch circuit that turns on and off the RF pulse signal by a second pulse signal, the pulse width of the second pulse signal is longer than the pulse width of the first pulse signal, and the first pulse signal is A pulse modulation circuit in which the second pulse signal is also on when on.

[2] The pulse modulation mixer is connected to a first pulse input terminal for inputting the first pulse signal and a local oscillation power input terminal for inputting the local oscillation wave, and the switch circuit The second pulse input terminal for inputting the second pulse signal and the RF output terminal for outputting the RF pulse signal are connected.

The pulse modulation circuit according to claim 1.

[3] A pulse modulation mixer that mixes the 2n harmonic of the local oscillation wave and the first pulse signal to output an RF pulse signal;

A switch circuit that turns on and off the local oscillation wave by a second pulse signal, the pulse width of the second pulse signal is longer than the pulse width of the first pulse signal, and the first pulse signal is A pulse modulation circuit in which the second pulse signal is also on when on.

[4] The pulse modulation mixer is connected to a first pulse input terminal for inputting the first pulse signal and an RF output terminal for outputting the RF pulse signal.

Connected to the switch circuit are a local oscillation power input terminal for inputting the local oscillation wave and a pulse input terminal for inputting the second pulse signal.

The pulse modulation circuit according to claim 3.

[5] A pulse modulation mixer that outputs an RF pulse signal by mixing the 2n harmonic of the local oscillation wave and the first pulse signal;

A first switch circuit for turning on and off the local oscillation wave by a second pulse signal; and a second switch circuit for turning on and off the RF pulse signal by the second pulse signal; A pulse modulation circuit in which when the pulse width of the second pulse signal is longer than the pulse width of the first pulse signal and the first pulse signal is on, the second pulse signal is also on.

A first pulse input terminal for inputting the first pulse signal is connected to the pulse modulation mixer,

The first switch circuit is connected to a local oscillation power input terminal for inputting the local oscillation wave and a second pulse input terminal for inputting the second pulse signal,

The second switch circuit is connected to a third pulse input terminal for inputting the second pulse signal and an RF output terminal for outputting the RF pulse signal.

The pulse modulation circuit according to claim 5.