KR102005898B1 - Device for processing signal - Google Patents

Device for processing signal Download PDF

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Publication number
KR102005898B1
KR102005898B1 KR1020190081488A KR20190081488A KR102005898B1 KR 102005898 B1 KR102005898 B1 KR 102005898B1 KR 1020190081488 A KR1020190081488 A KR 1020190081488A KR 20190081488 A KR20190081488 A KR 20190081488A KR 102005898 B1 KR102005898 B1 KR 102005898B1
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KR
South Korea
Prior art keywords
signal
analog
digital
digital converter
path
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KR1020190081488A
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Korean (ko)
Inventor
고민호
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한화시스템 주식회사
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    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12Analogue/digital converters
    • H03M1/18Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
    • H03M1/188Multi-path, i.e. having a separate analogue/digital converter for each possible range
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12Analogue/digital converters
    • H03M1/18Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
    • H03M1/186Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedforward mode, i.e. by determining the range to be selected directly from the input signal

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing apparatus and a signal processing method using the same, and more particularly, to a signal processing apparatus for converting an analog signal into a digital signal and a signal processing method using the same.
A signal processing apparatus according to an embodiment of the present invention includes: a signal branching unit for outputting an input signal including an analog signal to a main path and a sub path different from the main path, respectively; A plurality of analog-to-digital converters arranged in parallel on the main path for converting an input signal into a digital signal; A main switch for selectively connecting the plurality of analog-to-digital converters to the signal branching section on the main path; A signal sensing unit coupled to the auxiliary path for sensing a signal level of the input signal; And a control unit for controlling the connection of the main switch according to a signal level of the input signal sensed by the signal sensing unit.

Description

{DEVICE FOR PROCESSING SIGNAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing apparatus and a signal processing method using the same, and more particularly, to a signal processing apparatus for converting an analog signal into a digital signal and a signal processing method using the same.

A digital receiver converts an analog signal received through an analog to digital converter (ADC) into a digital signal, and extracts desired information from the received signal by applying a digital signal processing technique.

The performance of such a digital receiver is greatly influenced by the high-speed processing of the signal and the dynamic range. At this time, the dynamic range of the digital receiver depends to a large extent on the dynamic range of the analog-to-digital converter

That is, the analog-to-digital converter converts an analog signal into a digital signal for a received signal having a level between the lowest signal level (or magnitude, intensity) of the dynamic range and the highest signal level. At this time, when an analog signal having a signal level (hereinafter referred to as a saturation level) out of the dynamic range of the analog-to-digital converter is input, the analog-to-digital converter operates in a nonlinear section and causes distortion of the output signal.

In addition, when the digital receiver receives a signal whose signal level is variable, the analog-to-digital converter must be able to accommodate the signal level of the received signal.

However, the digital receiver mounted on the active phased array radar receives the reflected signal from the target according to the beam steering angle. Thus, depending on the change of the beam steering, the target type, and the detection distance, It changes suddenly.

In this case, the conventional digital receiver has a problem that the output signal is distorted when the analog signal of the saturation level is inputted, and the desired information such as the distance and the Doppler value can not be extracted from the received signal. Accordingly, the conventional digital receiver can not grasp signal sources such as signal intensity, frequency, distance measurement, Doppler measurement, and the like, and it can be applied to radar, communication and electronic warfare Which can lead to catastrophic results in areas where analysis is required.

KR 10-2009-0128255 A

The present invention provides a signal processing apparatus capable of converting a digital signal without distortion or loss even when an analog signal outside the dynamic range of the analog-to-digital converter is received, and a signal processing method using the same.

A signal processing apparatus according to an embodiment of the present invention includes: a signal branching unit for outputting an input signal including an analog signal to a main path and a sub path different from the main path, respectively; A plurality of analog-to-digital converters arranged in parallel on the main path for converting an input signal into a digital signal; A main switch for selectively connecting the plurality of analog-to-digital converters to the signal branching section on the main path; A signal sensing unit coupled to the auxiliary path for sensing a signal level of the input signal; And a control unit for controlling the connection of the main switch according to a signal level of the input signal sensed by the signal sensing unit, wherein the plurality of analog-to- A first analog-digital converter including an attenuator for attenuating the attenuator and a first analog-to-digital converter for converting a signal output from the attenuator into a digital signal; And a second analog-to-digital converter including an amplifier for amplifying a signal level of a signal output from the signal branching unit, and a second analog-to-digital converter for converting a signal output from the amplifier into a digital signal, The first analog-to-digital converter transmits a first overflow bit to the control unit when the signal level of the signal output from the signal branching unit is larger than the maximum signal level in the dynamic range of the first analog-to-digital converter And the second analog-to-digital converter converts the second overflow bit into a second overflow bit if the signal level of the signal output from the signal branching unit is smaller than the lowest signal level in the dynamic range of the second analog- And the control unit transmits the first overflow bit Wherein the first analog-to-digital converter is configured to increase the amount of attenuation of the attenuator when the second overflow bit is activated and to increase the amount of amplification of the amplifier when the second overflow bit is activated, A first terminating circuit; And a first switch for selectively connecting the first analog-to-digital converter or the first end-circuit to the attenuator, wherein when the second analog-to-digital conversion unit is connected to the signal branching unit , And controls the first switch so that the first end circuit is connected to the attenuator.

Wherein the second analog-to-digital converter comprises: a second termination circuit grounded in parallel to the second analog-to-digital converter; And a second switch for selectively connecting the second analog-to-digital converter or the second end-circuit to the amplifier, wherein when the first analog-to-digital conversion unit is connected to the signal branching unit And control the second switch such that the second end circuit is connected to the amplifier.

According to the signal processing apparatus and the signal processing method using the signal processing apparatus according to the embodiment of the present invention, a path through which an input signal including an analog signal is transmitted is selected by a main switch unit and converted into a digital signal, And path selection errors can be avoided.

Further, by selecting the path for converting the input signal according to the signal level of the input signal, it is possible not only to shorten the additional signal processing time, but also to judge whether the digital converter saturates by using the overflow bit, Distortion can be minimized.

In addition, according to the signal processing apparatus and the signal processing method using the signal processing apparatus according to the embodiment of the present invention, the gain of the attenuator for attenuating the signal level of the input signal and the gain for amplifying the signal level of the input signal are controlled in real time Deterioration of performance due to saturation of the component parts can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.
2 shows a signal processing apparatus according to an embodiment of the present invention.
3 is a diagram showing a first analog-to-digital converter according to an embodiment of the present invention.
4 is a diagram illustrating a second analog-to-digital converter according to an embodiment of the present invention.
5 is a view showing a state in which a first analog-to-digital conversion unit is connected to a signal branching unit on a main path;
6 is a diagram showing a state in which a second analog-to-digital conversion section is connected to a signal branching section on a main path;
7 illustrates a signal processing method in accordance with an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Wherein like reference numerals refer to like elements throughout.

1 is a view showing a general signal processing apparatus.

1, a general signal processing apparatus includes an antenna 10 for receiving an analog signal, an analog signal processor 20 for processing a received analog signal, an analog-to-digital converter 30 for converting an analog signal into a digital signal, And a digital signal processor 40 for processing digital signals.

Here, the processing of the analog signal means a preprocessing for preventing distortion of the output signal in the analog-to-digital converter 30, and by performing such a preprocessing, the dynamic range of the analog-digital converter 30 The analog signal having a signal level (hereinafter referred to as " saturation level ") is prevented from being input to the analog-to-digital converter 30. [

That is, the analog signal processor 20 outputs the signal level (amplitude, intensity, size, etc.) of the input signal having the saturation level out of the dynamic range of the analog-digital converter 30 among the input signals input to the analog signal processor 20 Limit. Such an analog signal processor 20 generally comprises a gain control circuit and a limiter circuit disposed in front of the analog-to-digital converter 20.

However, when the signal level of the input signal is limited by the gain control circuit and the limiter circuit, there is a problem that the signal level of the input signal is continuously measured and additional signal processing time is required to limit the signal level according to the measured signal level have. Further, in the case of the limiter circuit, signal distortion due to signal limitation occurs.

Therefore, the signal processing apparatus according to the embodiment of the present invention and the signal processing method using the same provide technical features that can minimize signal distortion without requiring additional signal processing time. A signal processing apparatus and a signal processing method using the same will be described in detail.

2 is a diagram illustrating a signal processing apparatus according to an embodiment of the present invention. 3 is a diagram illustrating a first analog-to-digital conversion unit 300 according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating a second analog-digital conversion unit 400 according to an embodiment of the present invention.

2 to 4, a signal processing apparatus according to an embodiment of the present invention includes an input signal including an analog signal as a main path M and a sub path S different from the main path M, A signal branching unit 100 for outputting a signal; A plurality of analog-to-digital converters arranged in parallel on the main path M for converting an input signal into a digital signal; A main switch (200) for selectively connecting the plurality of analog-to-digital converters to the signal branching unit (100) on the main path (M); A signal sensing unit 600 connected to the auxiliary path S for sensing a signal level of the input signal; And a controller 500 for controlling the connection of the main switch 200 according to a signal level of the input signal sensed by the signal sensing unit 600.

A signal processing apparatus according to an embodiment of the present invention is connected to a rear end of an antenna (not shown) for receiving an analog signal, and converts an input signal including a received analog signal into a digital signal. Hereinafter, the term " front end " means a position where signal processing is first performed on a signal movement path, and the term " rear end " means a position where signal processing is performed later on a signal movement path.

The signal branching section 100 outputs an input signal including an analog signal to the main path M and the auxiliary path S different from the main path M. [ Here, the signal branching unit 100 may use a divider to divide and distribute the input signal directly, but it may include a directional coupler to block the signal output to the main path M from entering the auxiliary path S .

The directional coupler is used to appropriately combine two waveguides or to separate signals according to directions by separating the two lines. By using a directional coupler in the signal branching unit 100, the input signal is separated by a directional coupler into a main path M and the auxiliary path S, but signals output to the main path M through the directional coupler can not be introduced into the auxiliary path S. As described above, by using the directional coupler as the signal branching unit 100, the degree of isolation between the main path M and the auxiliary path S can be improved, and the accurate signal level of the input signal can be obtained Can be detected.

A plurality of analog-to-digital converters are arranged in parallel on the main path M to convert an input signal including an analog signal into a digital signal. That is, a plurality of analog-to-digital converters are arranged in parallel on the main path M to form respective analog-digital conversion paths, and the analog-digital conversion paths are respectively output from the signal branching unit 100 to the main path M Thereby forming a signal transmission path.

Here, the plurality of analog-to-digital conversion units include a first analog-to-digital conversion unit 300 for attenuating and converting the signal level of the input signal, and a second analog-to-digital conversion unit 400 for amplifying and converting the signal level of the input signal .

When the signal level of the signal output from the signal branching unit 100 is out of the dynamic range of the first analog-to-digital converter 340 (for example, the first analog-to-digital converter 340) The signal level of the signal output from the signal branching unit 100 is attenuated and then converted into a digital signal. When the signal level of the signal output from the signal branching unit 100 is out of the dynamic range of the second analog-to-digital converter 440 (for example, the second analog-to-digital converter 440), the signal level of the signal output from the signal branching unit 100 is amplified and converted into a digital signal.

The first analog-to-digital conversion unit 300 includes an attenuator 310 for attenuating a signal level of a signal output from the signal branching unit 100 and a second analog-to-digital conversion unit 300 for converting a signal output from the attenuator 310 into a digital signal And a first analog-to-digital converter (340).

The attenuator 310 attenuates the signal level of the signal output from the signal branching unit 100. The attenuator 310 may be a resistance circuit or the like and may have various configurations for reducing the signal level (amplitude, intensity, size, etc.) without changing the waveform of the signal. .

The first filter 330 may be connected to the rear end of the attenuator 310. The first filter 330 removes unwanted waves from the signal output from the attenuator 310, and may be a band-pass filter (BPF) or the like.

The first analog-to-digital converter 340 converts the signal output from the attenuator 310 to a digital signal. The first analog to digital converter 340 may be connected to the rear end of the first filter 330 and the first analog to digital converter 340 may be implemented with at least one analog to digital converter (ADC) element.

The first analog-to-digital converter 300 according to the embodiment of the present invention includes a first end circuit 350 grounded in parallel to the first analog-to-digital converter 340, And may further include a first switch 320 for selectively connecting the analog-to-digital converter 340 or the first termination circuit 350. [ Here, the first termination circuit 350 may be configured to have a termination resistance of 50? In a configuration for grounding one terminal of the first switch 320. FIG.

When the first analog-to-digital converter 300 further includes the first end circuit 350 and the first switch 320, the controller 500 controls the signal branching unit 100 to output the second analog- It is possible to control the main switch 200 and the first switch 320 so that the first end circuit 350 is connected to the attenuator 310. In connection with this operation, Will be described later.

The second analog-to-digital conversion unit 400 includes an amplifier 410 for amplifying a signal level of a signal output from the signal branching unit 100 and a second analog-to-digital converter 400 for converting a signal output from the amplifier 410 into a digital signal And a second analog-to-digital converter 440.

The amplifier 410 amplifies the signal level of the signal output from the signal branching unit 100. The amplifier 410 may be configured as an OP-AMP, a transistor, or the like, and various configurations may be applied to increase the signal level (amplitude, intensity, size, etc.) without changing the waveform of the signal. A description thereof will be omitted.

The second filter 430 may be connected to the rear end of the amplifier 410. The second filter 430 is used to remove unwanted waves from the signal output from the amplifier 410, and a band-pass filter (BPF) or the like may be used in the same manner as the first filter 330.

The second analog-to-digital converter 440 converts the signal output from the amplifier 410 to a digital signal. The first analog digital converter 340 may be connected to the rear end of the first filter 330 and the second analog digital converter 440 may be connected to at least one analog digital converter ) Device. Here, the first analog-to-digital converter 340 and the second analog-to-digital converter 440 may have the same configuration or similar performance.

The second analog-to-digital converter 400 according to the embodiment of the present invention includes a second termination circuit 450 grounded and connected in parallel to the second analog-to-digital converter 440, And may further include a second switch 420 for selectively connecting the analog-to-digital converter 440 or the second terminal circuit 450. [ Here, the second end circuit 450 may be configured to ground a terminal of the second switch 420 and have a termination resistance of 50? As in the first end circuit 350. FIG.

When the second analog-to-digital conversion unit 400 further includes the second end circuit 450 and the second switch 420, the controller 500 controls the signal branching unit 100 to output the first analog- The main switch 200 and the second switch 420 may be controlled such that the second terminal circuit 300 is connected to the amplifier 410 and the second terminal circuit 450 is connected to the amplifier 410. In connection with this operation, Will be described later.

The main switch 200 selectively connects the plurality of analog-to-digital converters described above to the signal branching unit 100 on the main path M. That is, the main switch 200 selects a transmission path of a signal output from the signal branching unit 100 for a plurality of analog-to-digital conversion paths formed by a plurality of analog-to-digital conversion units.

The signal sensing unit 600 is connected to the auxiliary path S and senses the signal level of the input signal. The signal sensing unit 600 may include a diode or the like to convert the signal level of the signal output to the sub path S into a voltage value and output the received signal level to a received signal strength indicator (RSSI).

The control unit 500 controls the connection of the main switch 200 according to the signal level of the input signal sensed by the signal sensing unit 600. That is, the controller 500 selects one of the plurality of analog-to-digital converters according to the signal level of the input signal sensed by the signal sensing unit 600, and converts the signal output to the main path into a digital signal.

Here, the controller 500 may include a first analog-to-digital converter 300 for attenuating the signal level of the input signal when the signal level of the input signal detected by the signal sensing unit 600 is greater than a first threshold value So that the input signal is transmitted along the first analog to digital conversion path. On the other hand, when the signal level of the input signal sensed by the signal sensing unit 600 is greater than the second threshold value, the controller 500 controls the second analog-to-digital converter 400 to amplify the signal level of the input signal, So that the input signal is transmitted along the second analog to digital conversion path.

Here, the first threshold value may be smaller than the second threshold value, and the signal level range of the input signal for passing through the first analog-digital conversion unit 300 and the input signal level range for passing through the second analog-digital conversion unit 400 It is possible to prevent signal loss from occurring by designing the signal level range of the signal to partially overlap. When the signal level range of the input signal for passing through the first analog-digital conversion unit 300 and the signal level range of the input signal for passing through the second analog-digital conversion unit 400 are overlapped, The input signal having the signal level can be set to be transmitted via the first analog-to-digital converter 300 or the second analog-to-digital converter 400.

In addition, the controller 500 can extract desired information Data from the digital signal converted by the first analog-to-digital converter 300 or the second analog-digital converter 400. That is, the control unit 500 is connected to the downstream ends of the first analog-to-digital conversion unit 300 and the second analog-digital conversion unit 400, receives the converted digital signal from the input signal including the analog signal, Information (Data) can be extracted.

Hereinafter, the operation of the signal processing apparatus according to the embodiment of the present invention will be described in detail.

5 is a diagram illustrating a state in which the first analog-to-digital conversion unit 300 is connected to the signal branching unit 100 on the main path M. FIG. And the second analog-to-digital conversion unit 400 are connected.

5, when a strong field signal having a signal level equal to or higher than the first threshold value is input as an input signal, the input signal is differentiated from the main path M and the main path M by the signal branching unit 100 And the auxiliary path S, respectively.

Since the signal level of the input signal is greater than the first threshold value, the control unit 500 connects the main switch 200 to the first analog-to-digital conversion unit 300. The controller 500 also connects the first switch 320 to the first analog-to-digital converter 340 through the first filter 330. In this way, the control unit 500 controls the main switch 200 and the first switch 320 so that the input signal output through the main path M is attenuated and converted into a digital signal.

The controller 500 also connects the first switch 320 to the first analog digital converter 340 through the first filter 330 and the second switch 420 to the second terminal circuit 450 You can connect. By connecting the second switch 420 included in the second analog-to-digital converter 400 to the second terminating circuit 450, the strong analog signal transmitted along the first analog-digital conversion path is converted into the second analog- Path to the second analog-to-digital converter 440 can be prevented.

Meanwhile, the first analog-to-digital converter 340 converts a signal inputted through the first filter 330 into a digital signal. At this time, the input signal has its signal level reduced through the attenuator 310, but its signal level may still have a value out of the dynamic range of the first analog-to-digital converter 340. That is, the signal level of the input signal may be greater than the highest signal level to which the dynamic range of the first analog-to-digital converter 340 belongs, even through the attenuator 310. [ In this case, the first analog-to-digital converter 340 may transmit the first overflow bit OVF1 indicating the saturation of the first analog-to-digital converter 340 to the controller 500. That is, when a signal having a value higher than the highest signal level is input to the first analog-to-digital converter 340, the first overflow bit OVF1 transmitted to the controller 500 is activated. In this case, The attenuation amount of the attenuator 310 is increased to attenuate the signal level of the input signal to a greater extent. Thus, it is unnecessary to constantly measure the signal level of the input signal on the transmission path by judging whether the first analog digital converter 340 saturates using the first overflow bit OVF1, thereby minimizing the signal processing time .

6, when a weak electric field signal having a signal level equal to or lower than the second threshold value is input as an input signal, the input signal is divided into a main path M and a main path M and a different auxiliary path S, respectively.

Here, since the signal level of the input signal is smaller than the second threshold, the controller 500 connects the main switch 200 to the second analog-to-digital converter 400. In addition, the controller 500 connects the second switch 420 to the second analog-to-digital converter 440 through the second filter 430. In this way, the control unit 500 controls the main switch 200 and the second switch 420 so that the input signal output through the main path M is amplified and converted into a digital signal.

The controller 500 also connects the second switch 420 to the second analog-to-digital converter 440 through the second filter 430 and simultaneously connects the first switch 320 to the first terminal circuit 350 You can connect. Thus, by connecting the first switch 320 included in the first analog-to-digital converter 300 to the first terminating circuit 350, the weak electric field signal transmitted along the second analog-digital conversion path is amplified, Digital conversion path to be prevented from flowing into the first analog-to-digital converter 340.

Meanwhile, the second analog-to-digital converter 440 converts the signal input through the second filter 430 into a digital signal. At this time, the input signal is amplified in the signal level through the amplifier 410, but still its signal level may have a value out of the dynamic range of the second analog-to-digital converter 440. That is, the signal level of the input signal may have a value less than the lowest signal level belonging to the dynamic range of the second analog-to-digital converter 440 even through the amplifier 410. [ In this case, the second analog-to-digital converter 440 may transmit the second overflow bit OVF2 indicating the saturation of the second analog-to-digital converter 440 to the controller 500. That is, when a signal having a value smaller than the minimum signal level is input to the second analog-to-digital converter 440, the second overflow bit OVF2 transmitted to the controller 500 is activated. In this case, The amplification amount of the amplifier 410 is increased to increase the signal level of the input signal to a larger extent. Thus, it is unnecessary to constantly measure the signal level of the input signal on the transmission path by judging whether the second analog-to-digital converter 440 saturates using the second overflow bit OVF2, thereby minimizing the signal processing time .

Hereinafter, a signal processing method according to an embodiment of the present invention will be described. In this regard, the description of the signal processing apparatus according to the embodiment of the present invention will not be repeated.

7 is a diagram illustrating a signal processing method according to an embodiment of the present invention.

Referring to FIG. 7, a signal processing method according to an embodiment of the present invention includes the steps of outputting an input signal including an analog signal to a main path M and a sub path S different from the main path M (S100); Detecting a signal level of an input signal output from the auxiliary path S (S200); A step (S300) of selecting one of a plurality of analog-digital conversion paths arranged in parallel on the main path (M) according to a signal level of the sensed input signal; And converting the input signal to a digital signal via the selected analog digital conversion path (S400).

The step S100 of outputting the input signal to the main path M and the auxiliary path S different from the main path M may be performed by the signal branching unit 100, And a sub path S different from the main path M, respectively. Here, the signal branching unit 100 may use a divider to divide and distribute the input signal directly, but it may include a directional coupler to block a signal output to the main path M from entering the auxiliary path S Is as described above.

In step S200 of sensing the signal level of the input signal, the signal level of the input signal output to the auxiliary path S by the signal branching unit 100 is sensed through the signal sensing unit 600. [ Here, the step of detecting the signal level of the input signal (S200) may convert the signal level of the input signal into a voltage value and output it as a received signal strength indicator (RSSI).

In step S300 of selecting one of the plurality of analog-digital conversion paths, one of a plurality of analog-digital conversion paths arranged in parallel on the main path M according to the signal level of the input signal sensed by the signal sensing unit 600 .

Here, the plurality of analog-digital conversion paths are paths arranged in parallel on the main path M to convert an input signal including an analog signal into a digital signal, and a plurality of analog- A conversion section is arranged to convert the input signal into a digital signal.

The plurality of analog-to-digital conversion paths include an attenuator 310 for attenuating the signal level of the input signal and a first analog-to-digital converter 340 for converting the signal output from the attenuator 310 into a digital signal, An amplifier 410 for amplifying a signal level of an input signal, and a second analog-to-digital converter 440 for converting a signal output from the amplifier 410 into a digital signal, And a second analog to digital conversion path that is sequentially arranged.

A first filter 330 may be disposed between the attenuator 310 and the first analog digital converter 340 and a second filter 430 may be disposed between the amplifier 410 and the second analog digital converter 440. [ And with respect to each configuration arranged in the first analog-digital conversion path and the second analog-digital conversion path, it is the same as that described above with respect to the signal processing apparatus according to the embodiment of the present invention, Is omitted.

In step S300, if the signal level of the input signal is greater than the first threshold value, the first analog / digital conversion path is selected. If the signal level of the input signal is greater than the second threshold value, The second analog-to-digital conversion path can be selected.

That is, when the signal level of the input signal sensed by the signal sensing unit 600 is greater than the first threshold value, the controller 500 performs a first analog-to-digital conversion unit 300 for attenuating the signal level of the input signal So that the input signal is transmitted along the first analog to digital conversion path. On the other hand, when the signal level of the input signal sensed by the signal sensing unit 600 is greater than the second threshold value, the controller 500 controls the second analog-to-digital converter 400 to amplify the signal level of the input signal, So that the input signal is transmitted along the second analog to digital conversion path.

Here, the first threshold value may be smaller than the second threshold value, and the signal level range of the input signal for passing through the first analog-digital conversion unit 300 and the input signal level range for passing through the second analog-digital conversion unit 400 It is possible to prevent the signal loss from occurring by designing the signal level range of the signal to be partially overlapped with each other.

The process of converting an input signal to a digital signal (S400) converts an input signal to a digital signal via an analog-to-digital conversion path selected in a step S300 of selecting one of a plurality of analog-digital conversion paths. That is, in the step of converting the input signal into the digital signal (S400), the input signal is attenuated or amplified through the first analogue digital conversion path or the second analogue digital conversion path, and is converted into a digital signal.

Here, the step of converting the input signal to the digital signal (S400) may include connecting the amplifier (410) to the ground when the first analog to digital conversion path is selected in the step of selecting the analog to digital conversion path (S300) If the second analog to digital conversion path is selected in step S300 of selecting an analog to digital conversion path, the attenuator 310 may be connected to the ground.

Thereby, the strong electric field signal transmitted along the first analog-digital conversion path leaks to the second analog-digital conversion path, or the weak electric field signal transmitted along the second analog-digital conversion path is amplified and transmitted to the second analog- The leakage can be prevented as described above.

If the signal input to the first analog-to-digital converter 340 is out of the dynamic range of the first analog-to-digital converter 340, the process of converting the input signal to the digital signal (S400) The amount of amplification of the amplifier 410 may be increased if the signal input to the second analog-to-digital converter 440 is out of the dynamic range of the second analog-to-digital converter 440. [

That is, the input signal may include a first analog-to-digital converter 340 whose signal level has been reduced or increased through the attenuator 310 or the amplifier 410 but still has its signal level connected to the attenuator 310 and the amplifier 410, And may have a value outside the dynamic range of the second analog-to-digital converter 440. The first analog digital converter 340 and the second analog digital converter 440 receive the first overflow bit OVF1 and the second overflow bit OVF2 provided to the controller 500 when a signal having a signal level out of the dynamic range is input, The second overflow bit OVF2 can be activated. Accordingly, the saturation of the first analog digital converter 340 and the second analog digital converter 440 is determined by using the first overflow bit OVF1 and the second overflow bit OVF2, It is not necessary to constantly measure the propagation path on the propagation path, and the signal processing time can be minimized.

As described above, according to the signal processing apparatus and the signal processing method using the signal processing apparatus according to the embodiment of the present invention, the path through which the input signal including the analog signal is transmitted is selected by the main switch unit 200, It is possible to prevent a performance degradation due to inter-channel interference and an error in path selection.

Further, by selecting the path for converting the input signal according to the signal level of the input signal, it is possible not only to shorten the additional signal processing time, but also to judge whether the digital converter saturates by using the overflow bit, Distortion can be minimized.

In addition, according to the signal processing apparatus and the signal processing method using the signal processing apparatus according to the embodiment of the present invention, the attenuator 310 for attenuating the signal level of the input signal and the amplifier 410 for amplifying the signal level of the input signal The gain can be controlled in real time to prevent performance deterioration due to saturation of the component parts.

While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and the embodiments of the present invention and the described terminology are intended to be illustrative, It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

100: signal branching unit 200: main switch
300: first analog-to-digital converter 310: attenuator
320: first switch 330: first filter
340: first analog-to-digital converter 350: first-
400: second analog-to-digital converter 410: amplifier
420: second switch 430: second filter
440: second analog-to-digital converter 450: second termination circuit
500: control unit 600: signal detection unit

Claims (2)

  1. A signal branching section for outputting an input signal including an analog signal to a main path and a sub path different from the main path, respectively;
    A plurality of analog-to-digital converters arranged in parallel on the main path for converting an input signal into a digital signal;
    A main switch for selectively connecting the plurality of analog-to-digital converters to the signal branching section on the main path;
    A signal sensing unit coupled to the auxiliary path for sensing a signal level of the input signal; And
    And a controller for controlling connection of the main switch according to a signal level of the input signal sensed by the signal sensing unit,
    Wherein the plurality of analog-to-
    A first analog-digital converter including an attenuator for attenuating a signal level of a signal output from the signal branching unit and a first analog-to-digital converter for converting a signal output from the attenuator into a digital signal; And
    And a second analog-to-digital converter including an amplifier for amplifying a signal level of a signal output from the signal branching unit and a second analog-to-digital converter for converting a signal output from the amplifier into a digital signal,
    The first analog-to-digital converter transmits a first overflow bit to the control unit when the signal level of the signal output from the signal branching unit is larger than the maximum signal level in the dynamic range of the first analog-to-digital converter and,
    The second analog-to-digital converter transfers the second overflow bit to the control unit when the signal level of the signal output from the signal branching unit is smaller than the lowest signal level in the dynamic range of the second analog-to-digital converter In addition,
    The control unit increases the attenuation amount of the attenuator when the first overflow bit is activated and increases the amplification amount of the amplifier when the second overflow bit is activated,
    Wherein the first analog-to-
    A first termination circuit disposed in parallel to the first analog to digital converter and grounded; And
    And a first switch for selectively connecting the first analog-to-digital converter or the first terminal circuit to the attenuator,
    Wherein the control unit controls the first switch such that the first end-circuit is connected to the attenuator when the second analog-to-digital conversion unit is connected to the signal branching unit.
  2. The method according to claim 1,
    Wherein the second analog-to-
    A second termination circuit disposed in parallel to the second analog to digital converter and grounded; And
    And a second switch for selectively connecting the second analog-to-digital converter or the second terminal circuit to the amplifier,
    Wherein the control unit controls the second switch so that the second end-point circuit is connected to the amplifier when the first analog-to-digital conversion unit is connected to the signal branching unit.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000007224A (en) * 1998-07-01 2000-02-07 윤종용 Digital/analog converter test device
KR20000015842A (en) * 1997-03-21 2000-03-15 롤페스 요하네스 게라투스 알베르투스 Wireless receiver with offset compensation using flash-adc
JP2002118464A (en) * 2000-07-14 2002-04-19 Lucent Technol Inc Method and device for analog/digital using attenuated analog signal
KR20090128255A (en) 2008-06-10 2009-12-15 삼성전자주식회사 Analog-digital converter, display device including the same and driving method of the display device
KR101603144B1 (en) * 2015-04-22 2016-03-14 국방과학연구소 Digital receiver for preventing analog-to-digital converter saturation
KR20180072134A (en) * 2016-12-21 2018-06-29 에스케이하이닉스 주식회사 Analog-digital converting apparatus, and cmos image sensor thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000015842A (en) * 1997-03-21 2000-03-15 롤페스 요하네스 게라투스 알베르투스 Wireless receiver with offset compensation using flash-adc
KR20000007224A (en) * 1998-07-01 2000-02-07 윤종용 Digital/analog converter test device
JP2002118464A (en) * 2000-07-14 2002-04-19 Lucent Technol Inc Method and device for analog/digital using attenuated analog signal
KR20090128255A (en) 2008-06-10 2009-12-15 삼성전자주식회사 Analog-digital converter, display device including the same and driving method of the display device
KR101603144B1 (en) * 2015-04-22 2016-03-14 국방과학연구소 Digital receiver for preventing analog-to-digital converter saturation
KR20180072134A (en) * 2016-12-21 2018-06-29 에스케이하이닉스 주식회사 Analog-digital converting apparatus, and cmos image sensor thereof

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