KR20010070894A - System on chip for measuring the distance of the object for using doffler effect and Mouse having the same - Google Patents

Abstract

PURPOSE: A mouse including semiconductor chip capable of measuring movement distance of an object is provided to accurately measure a movement distance of the mouse by using the Doppler effect. CONSTITUTION: A mouse(1) transmits/receives ultrasonic waves. In addition, the mouse(1) is equipped with the first dome(10), which is the first direction in which the mouse(1) moves and the second dome(11) which is the second direction in which the mouse(1) moves. Therefore, the mouse(1) senses all directions of movements. A horizontal movement distance measuring circuit(20) for sensing a horizontal movement of the mouse(1) is attached to a determined position of the first dome(10). The circuit(20) calculates the difference between the frequency of the ultrasonic waves transmitted from a transmitter and the Doppler frequency received. A vertical movement distance measuring circuit(30) for sensing a vertical movement of the mouse(1) is attached to a determined position of the second dome(11).

Description

Semiconductor on chip for measuring the distance of the object for using doffler effect and Mouse having the same}

The present invention relates to a semiconductor chip (hereinafter referred to as "SOC") and a system having the same. The present invention relates to a mouse having SOC and SOC, which can measure the relative moving distance and direction of movement of the mouse in the reference plane.

A mouse is a pointing device for use in a personal computer (PC). In general, a mouse used in a personal computer (PC) is a ball mouse (ball mouse), an optical mouse (optical mouse) or an image sense mouse (image sense mouse).

In the ball mouse, the position of the mouse moves as the ball moves. However, when the ball mouse is degraded due to contamination of the ball and the rotating shaft rotating in contact with the ball, and the performance of the ball mouse is degraded due to the contamination, it is inconvenient to remove the contamination of the ball and the rotating shaft.

An optical mouse uses light instead of a ball to sense the movement of the mouse, which is inconvenient to use only on a specific pad (PAD) designed to reflect light. Also, if the pad is contaminated or damaged, the correct mouse is used. There is a problem that the movement distance of the unknown.

The image sensor mouse has an image sensor, a lens, and a light source for sensing an image at the bottom of the mouse. The image sensor mouse is expensive because it includes a processor for sensing the positional movement of the mouse from the amount of change in the sensed image. In addition, when the image sensor mouse is used on a mirror or a thick glass surface, there is a problem in that the position movement of the mouse cannot be accurately measured.

Therefore, the technical problem to be achieved by the present invention is to provide a system that can measure the relative distance, speed or direction of the reference plane and the system having the SOC using the Doppler effect.

The detailed description of each drawing is provided in order to provide a thorough understanding of the drawings cited in the detailed description of the invention.

1 illustrates a mouse provided with a semiconductor chip (SOC) according to an embodiment of the present invention.

FIG. 2 shows a side view of a mouse having respective travel distance measuring circuits in the first dome and the second dome.

3 is a block diagram of a moving distance measuring circuit according to an exemplary embodiment of the present invention.

4 is a circuit diagram of a window comparator and an input / output waveform thereof according to an embodiment of the present invention.

5 is a circuit diagram illustrating a Doppler frequency detector according to an embodiment of the present invention.

6 is a conceptual diagram illustrating a frequency extraction principle of a Doppler frequency detector according to an embodiment of the present invention.

The semiconductor memory device for achieving the above technical problem comprises a signal transmission circuit and a moving distance measuring circuit. The signal transmission circuit transmits a first signal having a first frequency to a reference plane. The moving distance measuring circuit receives a second signal reflected from the reference plane and having a Doppler frequency with respect to the first frequency, and uses the deviation between the first frequency and the Doppler frequency to make the reference plane and the semiconductor chip SOC. Calculate data about the relative moving distance, the relative moving speed or the moving direction and output the data.

The moving distance measuring circuit includes an amplifying circuit, a window comparing circuit, a Doppler frequency detecting circuit and a micro control unit. The amplifying circuit receives and amplifies the second signal having the Doppler frequency, and the window comparing circuit compares the output signal of the amplifying circuit with predetermined reference voltages, and according to the comparison result, the first comparison signal or the first comparison signal. 2 Outputs a comparison signal.

The Doppler frequency detection circuit receives the first comparison signal or the first frequency and counts an N period (N is a natural number) period of the first frequency and the N period of the first comparison signal, respectively, and the first frequency. The difference between the time required for counting the N periods and the time required for counting the N periods of the first comparison signal is detected and output.

The micro control unit calculates a deviation between the first frequency and the Doppler frequency in response to the output signals of the detection circuit to determine a relative movement distance, relative movement speed, or direction of movement of the reference plane and the semiconductor chip SOC. Calculate the data and output the data. Preferably, the micro control unit is not operated when the second comparison signal is activated.

In addition, a mouse for achieving the technical problem of the present invention is a main body having a first dome and a second dome, a first distance measuring circuit attached to a predetermined position of the first dome, and a predetermined position of the second dome And a second distance measuring circuit attached to each of the first distance measuring circuit and the second distance measuring circuit, each of the signal transmitting circuit transmitting a first signal having a first frequency to a reference plane, and reflected from the reference plane. And receiving a second signal having a Doppler frequency with respect to the first frequency, and using the deviation of the first frequency and the Doppler frequency, the relative movement distance, relative movement speed, or movement of the reference plane and the semiconductor chip SOC. And a travel distance measuring circuit for calculating data about the direction and outputting the data.

The moving distance measuring circuit is an amplifying circuit for receiving and amplifying the second signal having the Doppler frequency, comparing the output signal of the amplifying circuit with predetermined reference voltages, and comparing the first comparison signal or the second reference signal according to the comparison result. A window comparison circuit for outputting a comparison signal, receiving the first comparison signal or the first frequency and counting N periods of the first frequency (N is a natural number) and the N periods of the first comparison signal, respectively, A Doppler frequency detection circuit for detecting and outputting a difference between a time required for counting the N periods of a first frequency and a time required for counting the N periods of the first comparison signal, and output signals of the detection circuits; Calculating a deviation between the first frequency and the Doppler frequency in response to the relative moving distance and relative moving speed of the reference plane and the semiconductor chip SOC. Calculates the data for the moving direction and a micro control unit for outputting the data.

Preferably, when the second comparison signal is activated, the micro control unit is not operated. The first distance measuring circuit may include a relative moving distance, relative moving speed, or moving direction in which the mouse moves in the first direction on the reference plane. Compute data for and output the data.

The second distance measuring circuit calculates data about a relative moving distance, a relative moving speed, or a moving direction in which the mouse moves in the second direction on the reference plane and outputs the data.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

As used herein, the Doppler change refers to a frequency of a signal received from a moving object, such as an ultrasonic wave, a radio wave, sound wave, or a wave equation, by a relative motion between a reference plane and a moving object transmitting / receiving a predetermined signal. Say something to change.

Therefore, a reception frequency changed by the relative movement of a system, such as a mouse, having a transmitter 45 and a receiver 51 according to an embodiment of the present invention is referred to as a Doppler frequency.

1 illustrates a mouse provided with a semiconductor chip (SOC) according to an embodiment of the present invention. FIG. 2 shows a side view of a mouse having respective travel distance measuring circuits 20 and 30 in the first dome and the second dome. Each movement distance measuring circuit 20 and 30 may be implemented as a semiconductor chip (SOC).

1 and 2, the mouse 1 is a space for detecting movement of a first direction in which the mouse 1 moves, for example, a left / right direction based on a user, by transmitting / receiving ultrasound. And a second dome 11, which is a space for detecting movement of a first dome 10 and a second direction of the mouse 1, for example, a front / rear direction with respect to a user by transmitting / receiving an ultrasonic wave. . As a result, the mouse 1 can detect movement in all directions.

At a predetermined position of the first dome 10, a horizontal moving distance measuring circuit 20 for detecting a horizontal movement on a reference plane (horizontal plane) of the mouse 1 is attached. When the transmitter 45 of the horizontal moving distance measuring circuit 20 transmits ultrasonic waves at a predetermined angle θ with respect to the reference plane, the receiver 51 receives ultrasonic waves having a Doppler frequency reflected from the reference plane. The horizontal movement distance measuring circuit 20 calculates the difference between the frequency of the ultrasonic wave transmitted from the transmitter 45 and the received Doppler frequency to calculate the distance the mouse 1 moves in the left / right direction from the reference plane.

The predetermined distance of the second dome 11 is attached to the vertical movement distance measuring circuit 30 for detecting the vertical movement in the reference plane of the mouse (1). When the transmitter 45 of the vertical movement distance measuring circuit 30 transmits the ultrasonic waves at a predetermined angle α with respect to the reference plane, the receiver 51 receives the ultrasonic waves having the Doppler frequency reflected from the reference plane. The vertical movement distance measuring circuit 30 calculates a difference between the frequency of the ultrasonic wave transmitted by the transmitter 45 and the Doppler frequency of the received ultrasonic wave to measure the distance moved by the mouse 1 in the forward / backward direction from the reference plane.

The Doppler frequency is transmitted because the ultrasonic waves transmitted from the transmitter 45 are distributed in the direction of the transmitter 45 and returned even when the reference plane is inclined at a predetermined angle (Θ or α) with respect to the direction of the transmitter 45. In order to receive the ultrasound, the transmitter 45 may be used for transmission / reception or a separate receiver 51 may be used.

The speed of the ultrasonic waves returned to the transmitter 45 or the receiver 51 is equal to the velocity of the ultrasonic waves transmitted from the transmitter 45 to the reference plane. The transmitter 45 and the receiver 51 may be provided with a transmit / receive horn to transmit / receive ultrasonic waves.

The inner surfaces of the first dome 10 and the second dome 11 are coated with a predetermined material that is soundproofed with the surface structure of the dome for removing unnecessary frequency components other than the Doppler frequency reflected in the direction of the receiver 51. It is desirable to be. In addition, the mouse 1 of the present invention, in order to eliminate the interference of the ultrasonic waves generated in the horizontal moving distance measuring circuit 20 and the vertical moving distance measuring circuit 30, respectively, the horizontal moving distance measuring circuit 20 and the vertical moving distance The measuring circuit 30 is preferably installed in the first dome 10 and the second dome 11, respectively.

The horizontal moving distance measuring circuit 20 and the vertical moving distance measuring circuit 30 use the difference between the frequency of the ultrasonic wave transmitted from the transmitter 45 and the received Doppler frequency to move the left / right direction of the mouse 1. Alternatively, the moving distance, the moving direction, and the moving speed in the front and rear directions are respectively calculated, and data about the moving distance in the left and right directions or the moving distance in the front and rear directions on the reference plane of the mouse 1 can be obtained. Transfer to PC via The predetermined interface preferably uses a serial port, parallel port, universal serial bus or PS / 2.

Hereinafter, the Doppler effect will be briefly described to fully describe the present invention.

The Doppler frequency is distributed in the direction of the transmitter 45 or the receiver 51 even when the reference plane reflecting the ultrasonic wave transmitted by the transmitter 45 is inclined at a vertical angle or θ or α with respect to the transmitter 45. The speed of the ultrasonic waves returned and returned in the direction of the transmitter 45 is equal to the velocity of the ultrasonic waves transmitted from the transmitter 45 to the reference plane. However, when the transmitter 45 or the receiver 51 moves with respect to the reference plane, the frequency and wavelength of the ultrasonic wave transmitted / received are different.

The Doppler frequency f 'when the receiver 51 is fixed and the transmitter 45 moves is expressed by Equation (1).

However, when the transmitter 45 is fixed and the receiver 51 moves, the Doppler frequency f 'is expressed by Equation 2 below.

In addition, the Doppler frequency f ″ when the transmitter 45 and the receiver 51 simultaneously approach or away from the reference plane like a moving mouse is expressed by Equation 3 below.

In Equations 1 to 3, the sign of ± is determined by a case in which the moving directions of the transmitter 45 and the receiver 51 are relatively far from the case in which the moving direction is relatively close to the reference plane.

In Equations 1 to 3, fo denotes a transmission frequency of the transmitter 45, f 'denotes a Doppler frequency received by the receiver 51, and Us denotes a relative velocity of the transmitter 45 moving toward the receiver 51. Denotes the relative velocity of the receiver 51 moving towards the transmitter 45, and v denotes the velocity of the ultrasonic waves in the medium (eg air).

In addition, when the transmitter 45 and the receiver 51 move simultaneously with respect to the reference plane as shown in Equation 3, the shift of the transmission frequency fo of the transmitter 45 and the Doppler frequency f ″ received by the receiver 51 is shifted. (Δｆ) is expressed as in Equation 4.

When the angle of the transmitter 45 with respect to the reference plane is θ, the moving speed UG of the mouse 1 with respect to the reference plane is expressed by Equation 5 below.

When the mouse 1 having the transmitter 45 and the receiver 51 moves, the relative speed Us of the transmitter 45 moving toward the receiver 51 and the relative movement Us of the receiver 51 moving toward the transmitter 45. The relative speed Ur is the same and the relative speed Ur of the receiver 51 moving towards the transmitter 45 is significantly less than the speed v of the ultrasonic wave in the medium (eg air). Therefore, the equations (4) and (5) are summed up to obtain the Doppler frequency shift Δｆ.

By using Equation 6, when the deviation (Δｆ) of the transmission frequency fo and the Doppler frequency f "when the mouse 1 moves left / right or before / after is calculated, the mouse 1 is moved from the reference plane. Accurately determine the moving distance and direction moved left / right and before / after.

3 is a block diagram of a moving distance measuring circuit according to an exemplary embodiment of the present invention. Referring to FIG. 3, the horizontal moving distance measuring circuit 20 and the vertical moving distance measuring circuit 30 include a transmitting circuit 40 and a receiving circuit 50.

The transmitting circuit 40 includes a signal generating source 41, a frequency dividing circuit 43, and a transmitter 45. The signal generator 41 preferably uses a crystal oscillator to obtain an accurate oscillation frequency fosc with little error, and the oscillation frequency fosc is output to the frequency division circuit 43 and the MCU 55.

The frequency dividing circuit 43 receives an oscillation frequency fosc generated from the signal generator 41 and divides the frequency to suit the transmission frequency fo of the transmitter 45 so as to divide the transmission frequency fo into a Doppler frequency detector. Transmit power to 54 and also increase the power of the signal to drive the transmitter 45. The transmitter 45 receives the transmission frequency fo and outputs it at a predetermined angle α or θ with respect to the reference plane.

The receiving circuit 50 includes a receiver 51, an amplifier 52, a window comparator 53, a Doppler frequency detector 54, and a micro control unit (hereinafter referred to as 'MCU'). The receiver 51 may use a transmitter 45 having a transmission / reception function, or may use a separate receiver 51, and receives an ultrasonic wave tr having a Doppler frequency f ″ reflected from a reference plane. .

The amplifier 52 amplifies the output signal of the receiver 51 and outputs it to the window comparator 53. The amplifier 52 of the semiconductor chip SOC preferably uses a CMOS analog operational amplifier. The window comparator 53 outputs the first comparison signal RWS to the Doppler frequency detector 54 when the output signal Afr of the amplifier 52 having the Doppler frequency f ″ is within a predetermined range (or window). And the second operating signal ERS is outputted to the Doppler frequency detector 54 and the MCU 55 so that the detector 54 and the MCU 55 Do not perform the wrong distance operation.

4 is a circuit diagram of a window comparator and an input / output waveform thereof according to an embodiment of the present invention. Referring to FIG. 4, the window comparator 53 includes a plurality of resistors R1, R2, and R3, comparators 531 and 533, a first logic gate 535, and a second logic gate 537. .

The resistors R1, R2, and R3 are connected in series between the power supply voltage VDD and the ground voltage GND, and a connection node of one end of the resistor R1 and one end of the resistor R2 is the first reference of the first comparator 531. The voltage Vup and the other end of the resistor R2 and the connection node of one end of the resistor R3 supply the second reference voltage Vdn of the second comparator 531.

The first comparator 531 compares the output signal Afr of the amplifier 52 and the first reference voltage Vup and outputs a comparison result. The second comparator 533 is configured to output an output signal (A) of the amplifier 52. Afr) and the second reference voltage (Vdn) are compared and the comparison result is output.

The first reference voltage Vup and the second reference voltage Vdn may be adjusted by varying the plurality of resistors R1, R2, and R3. The first reference voltage Vup is greater than the second reference voltage Vdn.

The first logic gate 535 receives an output signal of the first comparator 531 and an output signal of the second comparator 533, performs a logic operation, and outputs a first comparison signal RWS, and outputs a first comparison signal RWS. 535 is preferably an AND gate. The second logic gate 537 receives the output signal of the first comparator 531 and the output signal of the second comparator 533, performs a logic operation, and outputs a second comparison signal ERS. 537) is preferably an exclusive logic gate (EX-OR) gate.

The input / output waveforms of the window comparator 53 are described as follows. First, when the magnitude of the amplitude of the ultrasonic wave Afr input to the window comparator 53 is between the first reference voltage Vup and the second reference voltage Vdn, the first comparator 531 outputs a logic 'low'. In addition, since the second comparator 533 outputs a logic 'high', the first logic gate 535 outputs a first comparison signal RWS, which is a logic 'low', and the second logic gate 537 is a logic ' A second comparison signal ERS that is high 'is output.

If the window is between the first reference voltage Vup and the second reference voltage Vdn, when the magnitude of the amplitude of the input ultrasonic wave Afr is within the window, the window comparator 53 is a logic 'high'. Since the two comparison signals ERS are output, the MCU 55 does not perform the distance calculation.

However, when the amplitude of the ultrasonic wave Afr is larger than the window, the first comparator 531 and the second comparator 533 output logic 'high', respectively, so that the first logic gate 535 has a logic 'high'. Output a first comparison signal RWS. In addition, the strength of the received signal is measured using the width of the section that is the logic 'high' of the second comparison signal ERS. The window comparator 53 may generate a plurality of windows by using a voltage divider of a plurality of resistors and a plurality of comparators.

The Doppler frequency detector 54 receives the first comparison signal RWS, the second comparison signal ERS, and the control signal CNTL from the MCU 55 to transmit a transmission frequency fo or a first comparison signal RWS. After counting the N (N is a natural number) cycles, the counter output signal CNTV indicating a predetermined state is output, and the time taken to count the N cycles of the transmission frequency fo and the first comparison signal RWS The timer outputs a predetermined timer output signal TRV to the MCU 55.

5 is a circuit diagram illustrating a Doppler frequency detector according to an embodiment of the present invention. Referring to FIG. 5, the Doppler frequency detector 54 includes a counter 541 and a timer 543 that is a timing device.

The counter 541 is configured to control the N transmit frequency fo or the first comparison signal RWS in response to the control signal CNTL output from the MCU 55 and the counting start signal START output from the timer 543. The counter is counted, and when the counting is completed, the counter 541 outputs a counting end signal LOAD to the timer 543. The counter 541 also counts N (N is a natural number) period of the transmission frequency fo, and then outputs a counter output signal CNTV indicating a predetermined state to the arithmetic circuit 56.

The timer 543 receives the control signal CNTL output from the MCU 55, the clock TRCLK generated by the clock generation circuit (not shown), and the second comparison signal ERS to receive the counting start signal START. Output to the counter 541. The timer 543 measures the time from the counting start signal START to the counting end signal LOAD. The clock generator may use a ring oscillator, a phase locked loop, a voltage controlled oscillator, a crystal oscillator, or the like.

In this case, the counter 541 counts the transmission frequency fo as well as the first comparison signal RWs. The frequency of the transmission frequency fo generated from the signal generator 41, which is a precise oscillator, is equal to N (N is a natural number). After counting, by reading the value of the timer 543 for the count value, the frequency of the clock (CLCLK), which is relatively inaccurate, can be inferred, thereby generating a clock (CLCLK) generation circuit that can occur in the manufacturing process of the semiconductor chip. This is to correct the error. These corrections are made when the system is powered up and at other times deemed necessary.

The counter 541 measures and uses the value of the timer 543 when the counter 541 counts the first comparison signal RWS by N (N is a natural number) period using the frequency of the clock (CLCLK) generation circuit derived from the above process. This will allow us to extract more reliable Doppler frequencies.

6 is a conceptual diagram illustrating a frequency detection principle of a Doppler frequency detector according to an embodiment of the present invention. Referring to FIG. 6, assuming that the transmission frequency fo is 40 KHz, cos θ is 1, and the mouse 1 moves 1 cm in 1 second, Δf becomes 2.35294 Hz according to equation (6).

Therefore, when the transmission frequency fo is 40 KHz, the error time between the transmission frequency fo and the Doppler frequency f " due to the movement of the mouse 1 becomes 1.47 ns for one period of signal. This is difficult to use as a deviation of the Doppler frequency in digital systems.

Therefore, assuming that the counter 541 controls to count 100 cycles at the transmission frequency fo, the counter 541 counts 100 cycles at the transmission frequency fo in response to the counting start signal START. After counting 100 cycles, the counting end signal LOAD is output to the timer 543. The timer 543 measures the time required for counting 100 cycles at the transmission frequency fo from the time when the counting start signal START is generated from the time when the counting end signal LOAD is received.

In addition, the counter 541 counts 100 cycles from the first comparison signal RWS having the Doppler frequency in response to the counting start signal START, and counts 100 cycles after the counting end signal LOAD. Will output The timer 543 then measures the time taken to count 100 cycles of the first comparison signal RWS having the Doppler frequency.

For example, a time difference corresponding to 1.47 ns * 100, i.e., 147.1 ns, between the time spent counting 100 cycles of the transmission frequency fo and the time spent counting 100 cycles of the first comparison signal RWS having the Doppler frequency. Is generated.

At this time, when the timer 543 responds to the clock TRCLK of 100 MHz, it takes time to count 100 cycles of the transmission signal fo and 100 cycles of the first comparison signal RWS having the Doppler frequency. The time difference is 14 or 15 on a clock basis (TRCLK).

The timer 543 outputs the clock TRCLK during the time required for counting 100 cycles of the first comparison signal RWS as the output signal TRV, or counts 100 cycles of the transmission signal fo. The clock TRCLK generated in the time difference required to count 100 cycles of the first comparison signal RWS having the time and the Doppler frequency may be output as the output signal TRV.

The MCU 55 includes an arithmetic circuit 56, a travel distance calculation circuit 57, and a signal transmission circuit 58. The calculation circuit 56 calculates the Doppler frequency f ″ of Equation 3 in response to the output signals CNTV and TRV of the Doppler frequency detector 54 to calculate the frequency fo of the transmitter 45 and the receiver 51. Calculate the deviation Δf of the Doppler frequency f "

The movement distance calculation circuit 57 calculates the deviation Δf between the frequency fo and the Doppler frequency f ″ of the receiver 51 to move the left / right movement distance and the front / rear movement on the reference plane of the mouse 1. The predetermined data obtained by calculating the distance, the moving direction, and the moving speed are output to the signal transmission circuit 58.

The signal transmission circuit 58 receives the data, which is an output signal of the travel distance calculation circuit 57, and transmits the data to a computer via USB or PS / 2. The computer transmits the data input via USB or PS / 2 to the display device via a predetermined interface.

Preferably, the predetermined interface is a serial port, a parallel port, or a USB. The display device displays the exact position of the mouse pointer input via the mouse 1.

According to the exemplary embodiment of the present invention, the signal generator 41, the divider circuit 43, the amplifier 52, the window comparator 53, the Doppler frequency detector 54, and the MUC 55 are connected to one semiconductor chip 100. system on chip). In addition, the semiconductor chip 100 according to the present invention is mounted at predetermined positions of the first dome 10 and the second dome 11 of the mouse 1 according to the present invention. Therefore, since each of the moving distance measuring circuits 20 and 30 can be implemented with a semiconductor chip (SOC), the mouse 1 to which they are mounted 20 can be made small.

The semiconductor chip 100 is briefly described below. The signal transmission circuit 40 includes a signal generation source 41 and a frequency division circuit 43, and transmits ultrasonic waves having a transmission frequency fo to a reference plane.

The movement distance measuring circuit 50 includes a receiver 51, an amplifier 52, a window comparison circuit 53, a Doppler frequency detection circuit 54, and a micro control unit 55.

The receiver 51 receives an ultrasonic wave fr having the Doppler frequency f " reflected from the reference plane, and the amplifier 52 amplifies the output signal of the receiver 51. The window comparator 53 has an amplifier 52 Output signal Afr and predetermined reference voltages Vup or Vdn are compared, and the first comparison signal RWS or the second comparison signal ERS is output according to the comparison result.

The Doppler frequency detector 54 receives the first comparison signal RWS or the transmission frequency fo and counts N periods of the transmission frequency fo (N is a natural number) and N periods of the first comparison signal RWS, respectively. The difference between the time required for counting the N periods of the transmission frequency fo and the time required for counting the N periods of the first comparison signal RWS is detected and output.

The micro control unit 55 calculates a deviation between the transmission frequency fo and the Doppler frequency f ″ in response to the output signals CNTV and RTV of the Doppler frequency detection circuit by using Equation 4 to calculate the reference plane and the semiconductor chip. Calculate data about the relative moving distance, the relative moving speed, or the moving direction of the system 100 or the system including the semiconductor chip 100, and output the data to the PC When the second comparison signal ERS is activated. The micro control unit 55 determines whether to execute the arithmetic function through an association relationship with the first comparison signal RWS.

The semiconductor memory device may measure precise speed, direction, or moving distance of a vehicle or a vehicle, and may precisely detect a moving distance, speed, or acceleration direction of an object such as a fluid flow meter.

Therefore, the mouse having the semiconductor chip (SOC) is more accurate than the mouse movement distance sensing capability of the ball mouse, the optical mouse, or the image sensor mouse, and the mouse movement distance is not affected by the characteristics of the contact surface that the mouse contacts for sensing. There is an advantage that can be sensed precisely.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the mouse having the horizontal moving distance measuring circuit 20 and the vertical moving distance measuring circuit 30 according to the present invention uses the Doppler effect, so that the mouse is not affected by the characteristics of the contact surface that the mouse contacts for sensing. There is an advantage that can accurately measure the moving distance of the mouse.

Claims (8)

In a system on chip, A signal transmission circuit for transmitting a first signal having a first frequency to a reference plane; And Receiving a second signal reflected from the reference plane and having a Doppler frequency with respect to the first frequency, using the deviation of the first frequency and the Doppler frequency, relative movement distance, relative movement speed, or A semiconductor chip comprising a movement distance measuring circuit for calculating data for a movement direction and outputting the data. According to claim 1, wherein the moving distance measuring circuit, An amplifier circuit for receiving and amplifying the second signal having the Doppler frequency; A window comparison circuit comparing the output signal of the amplification circuit with predetermined reference voltages and outputting a first comparison signal or a second comparison signal according to the comparison result; Receiving the first comparison signal or the first frequency and counting the N (N is a natural number) period of the first frequency and the N period of the first comparison signal, respectively, counting the N period of the first frequency A Doppler frequency detection circuit for detecting and outputting a difference between a time required to perform and a time required for counting the N periods of the first comparison signal; And In response to the output signals of the detection circuit, a deviation between the first frequency and the Doppler frequency is calculated to calculate data about a relative moving distance, a relative moving speed, or a moving direction of the reference plane and the semiconductor chip, and output the data. And a micro control unit. The method of claim 2, wherein the Doppler frequency detection circuit, A timer for receiving a control signal and a predetermined clock signal output from the micro control unit and outputting a counting start signal instructing operation of the counter; And A counter for counting N (N is a natural number) periods in the transmission frequency or the first comparison signal in response to the control signal and the counting start signal, and outputting a counting end signal to the timer when the counting is completed. Equipped with And the timer measures a time from a time point at which the counting start signal is output to a time point at which the counting end time is input to estimate a frequency of the clock signal and corrects an error of the clock signal. A mouse body having a first dome and a second dome; A first distance measuring circuit attached to a predetermined position of the first dome; And And a second distance measuring circuit attached to a predetermined position of the second dome, Each of the first distance measuring circuit and the second distance measuring circuit, A signal transmission circuit for transmitting a first signal having a first frequency to a reference plane; And Receiving a second signal reflected from the reference plane and having a Doppler frequency with respect to the first frequency, using the deviation of the first frequency and the Doppler frequency, relative movement distance, relative movement speed or movement of the reference plane and the mouse. And a moving distance measuring circuit for calculating data about a direction and outputting the data. The method of claim 4, wherein the moving distance measuring circuit, An amplifier circuit for receiving and amplifying the second signal having the Doppler frequency; A window comparison circuit comparing the output signal of the amplification circuit with predetermined reference voltages and outputting a first comparison signal or a second comparison signal according to the comparison result; Receiving the first comparison signal or the first frequency and counting the N (N is a natural number) period of the first frequency and the N period of the first comparison signal, respectively, counting the N period of the first frequency A Doppler frequency detection circuit that detects and outputs a difference between a time required to perform and a time required to count the N periods of the first comparison signal; And Computing a deviation between the first frequency and the Doppler frequency in response to the output signals of the detection circuit to calculate data about the relative distance, relative movement speed or direction of movement of the reference plane and the mouse and outputs the data. A mouse comprising a micro control unit. The method of claim 4, wherein the first distance measuring circuit, Calculating data about the relative moving distance, the relative moving speed, or the moving direction of the mouse in the first direction on the reference plane, and outputting the data; The second distance measuring circuit, And calculating data about a relative moving distance, a relative moving speed, or a moving direction in which the mouse moves in a second direction on the reference plane, and outputting the data. The method of claim 5, wherein the micro control unit, And if the second comparison signal is activated, determine whether to operate the arithmetic function through a correlation with the first comparison signal. The mouse of claim 4, wherein each of the first distance measuring circuit and the second distance measuring circuit is implemented as a semiconductor chip.