KR100281699B1 - Transmit Modulation Circuit - Google Patents

Abstract

The present invention relates to a transmission modulation circuit capable of outputting a stable modulation signal of a unified path regardless of the position of the detection target by applying digital technology.

The transmission modulation circuit includes a clock generator for generating a clock signal by inputting an oscillation output, a controller for outputting modulation signal information of phase, amplitude, and pulse width according to a near or far distance in synchronization with the clock signal of the clock generator; A signal modulator for inputting the modulated signal information output from the signal and integrating the phase and outputting a sine value for the integrated phase in synchronization with the clock signal of the clock generator, and outputting the output signal of the signal modulator in synchronization with the clock signal of the clock generator. And a digital / analog converter for converting and outputting an analog signal.

Description

Transmit Modulation Circuit

1 is a transmission modulation circuit diagram according to the prior art.

2 is a transmission modulation circuit diagram according to the present invention.

3 is an output state diagram of each block shown in FIG.

<Explanation of symbols for main parts of drawing>

1,21: reference oscillator 3,11: switch

5: mixer 7, 25: control unit

9: SAW filter 23: Clock generator

27: phase accumulator 29: sine value table

31: Multiplier 33: Digital / Analog Converter

35 low pass filter 37 frequency converter

39: amplifier 41: data bus

The present invention relates to a transmission modulation circuit, and more particularly, to a transmission modulation circuit capable of outputting a stable modulated signal by applying digital technology.

In general, in order to transmit a detection signal in a radar device which is widely used for near or far detection, a transmission modulator used according to a near or far position of a detection target is separated.

The above description will be described in detail with reference to FIG. 1 attached with a conventional transmission modulation circuit diagram.

First, the configuration, the reference oscillator (1) for outputting the oscillation signal, and is controlled by the control of the controller 7 so that the reference oscillator (1) the output signal to the mixer (5) or surface acoustic wave (Surface Acoustic Wave) filter (9) a first switch 3 applied to the following (hereinafter referred to as "SAM filter"), and is controlled by the control of the control unit 7 to output the output signal of the mixer (5) or SAW filter (9) It consists of the 2nd switch 11 which outputs to the terminal 13. As shown in FIG.

Modulation of the transmission signal by the above configuration is performed as follows.

Once the control target 7 determines whether the detection target is located at a long distance or a short distance, the control unit 7 applies a control signal to the mixer 5 capable of performing pulse modulation when located at a short distance. 2 Connect the signal paths of the switches 3 and 11 to the mixer 5 (state shown in FIG. 1).

Then, the oscillation signal output from the reference oscillator 1 is applied to the mixer 5 through the first switch 3, and in the mixer 5, pulse modulation is performed according to the control signal applied from the control unit 7. It is output to the second switch 11. The second switch 11 applies the pulse-modulated transmission signal to the output terminal 13 to transmit the modulated detection signal.

If the control unit 7 determines that the detection target is located at a long distance, the control signal capable of performing frequency modulation is applied to the SAM filter 9 capable of performing frequency modulation, while the first and second switches 3, The variable terminal of 11) is connected to the SAW filter 9. Then, the oscillation signal output from the reference oscillator 1 is applied to the SAW filter 9 through the first switch 3, and the frequency modulation is applied according to the control signal applied from the control unit 7 in the SAW filter 9. It is outputted to the output terminal 13 through the second switch (11).

As described above, since the conventional transmission modulation circuit performs analog signal processing, there is a problem in that modulation apparatuses for transmission signals should be provided according to the position of the target to be detected near or far.

Accordingly, an object of the present invention is to provide a transmission modulation circuit capable of outputting a stable modulated signal according to digital signal processing.

Another object of the present invention is to provide a transmission modulation circuit capable of performing signal modulation of a unified path regardless of the position of a detection target.

The present invention for achieving the above object is a clock generator for generating a clock signal by inputting the oscillation output, and outputs the modulation signal information of the phase, amplitude and pulse width according to the near or long distance in synchronization with the clock signal of the clock generator A signal modulator for inputting the modulation signal information output from the controller, integrating a phase, and outputting a sine value for the integrated phase in synchronization with a clock signal of the clock generator; And a digital / analog converter for synchronizing the output signal of the signal modulator with an analog signal and outputting the analog signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a transmission modulation circuit diagram according to an embodiment of the present invention, in which the clock generator 23 inputs the oscillation output of the reference oscillator 21 to generate a clock signal, and a clock signal applied by the clock generator 23. Referring to FIG. The controller 25 outputs the modulated signal information (phase, amplitude, pulse width) according to a long distance or short distance through the data bus 41 in synchronization with the clock signal applied by the clock generator 23. A phase accumulator 27 for outputting a signal corresponding to the modulated signal information applied from the controller 25 is provided.

A sine value table 29 for outputting a corresponding sine value in synchronization with a clock signal applied by inputting an output signal of the phase accumulator 27 and a clock signal applied from the clock generator 23; In response to the pulse width information applied from the controller 25 in synchronization, a multiplier 31 for outputting an output signal of the sine value table 29 and an output signal of the multiplier 31 are analogized. A digital / analog converter 33 for converting the signal is provided.

And a low pass filter 35 for limiting the output signal of the digital / analog converter 33, a frequency converter 37 for raising the frequency of the output signal, and an output signal of the frequency converter 37. It consists of an amplifier 39 for this purpose.

It looks at the operation and effects of the present invention according to the above configuration.

FIG. 3 is a diagram showing the output state of each block shown in FIG. 2 when phase data 30 ° is applied to the phase accumulator 27 as modulation signal information that is changed every clock signal by the controller 25. First, the oscillation output oscillated by the reference oscillator 21 is input to the clock generator 23 to generate a clock signal as shown in FIG.

The clock signal is applied as a reference clock signal of each block that performs digital signal processing, and the controller 25 performs frequency modulation amplitude modulation according to a center frequency and a short distance in synchronization with a clock signal applied from the clock generator 23. Modulated signal information (phase data 30 ° in FIG. 3) to be performed is output to the phase accumulator 27 via the data bus 41. `` (B) of the third degree ''

The phase accumulator 27 outputs a phase value accumulated according to the modulation signal information applied from the controller 25 to the sine value table 29 in synchronization with a clock signal applied from the clock generator 23. (C) of FIG. 3, the sine value table 29 outputs a sine value corresponding to a phase input in synchronization with the clock signal applied by the clock generator 23 to the multiplier 31. As shown in FIG. `` (D) of the third degree ''

The multiplier 31 is switched on / off according to the pulse width information applied from the control unit 25 so that the sine value output from the sine value table 29 is synchronized with a clock signal to the digital / analog converter 33. The digital / analog converter 33 converts a signal input in synchronization with a clock signal applied from the clock generator 23 to an analog signal and outputs the analog signal.

The signal output through the above process is filtered to a predetermined frequency band by the low pass filter 35 to remove the noisy signal and output to the frequency converter 37 [FIG. 3 (f)]. The converter 37 raises the frequency lowered during the modulation process, amplifies the signal suitable for transmission through the amplifier 39, and outputs the signal to the antenna. The output modulation signal output from the amplifier 39 is fed back to compensate for the difference with the desired output modulation signal.

As described above, the present invention can unify the signal flow paths for long-range and short-range detection by using digital technologies that are developing day by day, stabilize the output signal, and reduce the cost and economically. It has an advantage.

Claims (8)

Clock generation means for inputting an oscillation output to generate a clock signal, control means for outputting modulation signal information of phase, amplitude and pulse width according to a near or far distance in synchronization with a clock signal of the clock generation means, and the control means Signal modulation means for inputting the modulation signal information output from the signal to integrate the phase and outputting a sine value for the integrated phase in synchronization with the clock signal of the clock generating means, and the signal in synchronization with the clock signal of the clock generating means. And a digital / analog converting means for converting an output signal of the modulating means into an analog signal and outputting the analog signal. The method of claim 1; The signal modulating means includes: a phase accumulator for integrating a phase output from the control means in synchronization with a clock signal of the clock generating means, and a stored sine for the integrated phase in synchronization with a clock signal of the clock generating means. And a memory means for outputting a value. The method of claim 2; And the signal modulating means further comprises switching means for switching the output of the memory means in accordance with the pulse width information output from the control means in synchronization with the clock signal of the clock generating means. The method of claim 3; And a multiplier as the switching means. The method of claim 3; And a filtering means for filtering the output signal of the digital / analog conversion means. The method of claim 5; And said filtering means uses a low pass filter. The method of claim 5; And a frequency converting means for increasing a frequency at an output of said filtering means. The method of claim 7; And amplifying means for amplifying the output of said frequency converting means to an appropriate magnitude for transmission.