WO2006006574A1 - 光半導体集積回路装置 - Google Patents
光半導体集積回路装置 Download PDFInfo
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- WO2006006574A1 WO2006006574A1 PCT/JP2005/012793 JP2005012793W WO2006006574A1 WO 2006006574 A1 WO2006006574 A1 WO 2006006574A1 JP 2005012793 W JP2005012793 W JP 2005012793W WO 2006006574 A1 WO2006006574 A1 WO 2006006574A1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 69
- 239000004065 semiconductor Substances 0.000 title claims abstract description 63
- 239000003990 capacitor Substances 0.000 claims abstract description 61
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 claims description 90
- 238000001514 detection method Methods 0.000 claims description 31
- 239000011347 resin Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 31
- 230000008859 change Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 239000013256 coordination polymer Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 244000309464 bull Species 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J1/46—Electric circuits using a capacitor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/02016—Circuit arrangements of general character for the devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
- H01L31/10—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors characterised by potential barriers, e.g. phototransistors
- H01L31/101—Devices sensitive to infrared, visible or ultraviolet radiation
Definitions
- the present invention relates to an optical semiconductor integrated circuit device.
- Patent Document 1 JP-A-6-189204
- the present invention has been made in view of such a problem, and provides an optical semiconductor integrated circuit device that can change the sensitivity with a simple configuration, and thereby can easily widen the dynamic range.
- the purpose is to provide.
- a first optical semiconductor integrated circuit device includes a light detection element, charge voltage conversion means for generating a voltage corresponding to the amount of charge output from the light detection element, and the voltage , A time measuring means for measuring the time from the reference time until the output of the comparator switches, a conversion coefficient control means for controlling the conversion coefficient of the charge voltage conversion means, and a conversion coefficient control means An input / output terminal for inputting an input signal from the outside and taking out an output signal from the time measuring means to the outside is provided.
- a current is output from the light detection element in accordance with the amount of light incident on the light detection element.
- the amount of charge output from the photodetecting element is converted into a voltage.
- the output of the comparator is switched.
- the time measuring means measures the time from the reference time to the switching time, and therefore the output pulse width of the time measuring means is
- the light amount incident on the light detection element that is, the amount of electric charge output from the light detection element, is anti-iterated.
- the output of this time measuring means can be used to detect the amount of light incident on the photodetecting element by taking out the output of the input / output terminal.
- the input signal of external force is input to this input / output terminal. Is done.
- This input signal is input to the conversion coefficient control means, and changes the conversion coefficient of the charge voltage conversion means. That is, the conversion coefficient of the charge amount to voltage changes.
- the magnitude of the input signal to the comparator can be controlled by adjusting the conversion coefficient.
- the input to the comparator can be reduced by reducing the conversion coefficient (however, the voltage change amount is also small with respect to the change amount of the charge amount).
- Low accuracy Low sensitivity: Corresponds to the high light quantity region
- the charge amount is small, but in some cases, the input to the comparator can be increased by increasing the conversion coefficient (however, the charge amount
- High accuracy High sensitivity: Corresponds to the low light intensity range).
- this device can change the sensitivity from the outside and also take out the output of the light quantity measurement with the input / output terminal force, so that the sensitivity can be changed with a simple configuration. Thereby, the dynamic range can be easily expanded.
- the second optical semiconductor integrated circuit device is a resin that, in the first optical semiconductor integrated circuit device, molds the light detection element, the charge-voltage conversion unit, the comparator, the time measurement unit, and the conversion coefficient control unit.
- a package is further provided, and the input / output terminal is characterized in that the internal force of the resin package extends to the outside.
- the input / output terminal extending from the inside of the resin package to the outside is electrically connected to the control computer so that an input signal having a computer power can be received through the input / output terminal.
- the output signal can be input to a computer.
- the resin package protects each molded element and is transparent in the wavelength band from ultraviolet to infrared, so that light can be incident on the photodetecting element via the resin package.
- the resin package has the advantage of being lightweight.
- a third optical semiconductor integrated circuit device includes a time meter in the first optical semiconductor integrated circuit device.
- a tristate buffer for connecting the measuring means and the input / output terminal, and the time measuring means and the input / output terminal are substantially connected in accordance with the input of the enable signal to the tristate buffer.
- the time measuring means and the input / output terminal can be separated, and the input signal to which the input / output terminal force is also input is input to the conversion factor control circuit at the time of separation. can do.
- An optical semiconductor integrated circuit device is the first optical semiconductor integrated circuit device, further comprising a connection switch for connecting the time measuring means and the input / output terminal, and providing an image to the connection switch.
- the time measuring means and the input / output terminal are substantially connected and disconnected in accordance with the input of the bull signal.
- the time measuring means and the input / output terminal can be separated by using the connection switch, and the input signal input / output terminal force is input to the conversion coefficient control circuit at the time of separation. be able to.
- a fourth optical semiconductor integrated circuit device according to the third optical semiconductor integrated circuit device further includes a reset terminal for inputting an enable signal. That is, an enable signal can be input through the reset terminal.
- a fifth optical semiconductor integrated circuit device is the third optical semiconductor integrated circuit device according to (A): a disconnection period between the time measuring means and the input / output terminal through the input / output terminal; An input signal is input to the conversion coefficient control means, and (B) the time measurement means measures the time within a connection period between the time measurement means and the input / output terminal.
- the time measuring means and the input / output terminal are connected and disconnected. However, during the disconnection period, the input signal is input to the conversion coefficient control means via the input / output terminal. However, the time measuring means is not affected, and the signal obtained by measuring the time by the time measuring means can be taken outside the input / output terminal force within the connection period.
- a sixth optical semiconductor integrated circuit device is the same as the fourth optical semiconductor integrated circuit device, except that an enable signal input to a reset terminal is used as a reset signal that gives a reference time of time measuring means. It is characterized in that the reset terminal and the time measuring means are connected so as to serve as a signal.
- the reset terminal is a reset signal shared input terminal that also functions as an enable signal.
- a reference time of time measurement by the time measurement means can be given, and the time measurement means By disconnecting the output shared terminal, the influence of the external force input signal to the input / output shared terminal on the time measurement means can be eliminated.
- a seventh optical semiconductor integrated circuit device is the fourth optical semiconductor integrated circuit device, wherein the charge voltage conversion means includes a current mirror circuit in which one line is connected to the photodetecting element, and a current mirror circuit. And a variable capacitor connected to the other line.
- a current force proportional to the current output from the photodetecting element flows in the other line of the current mirror circuit, and a charge proportional to the time integral value of this current is accumulated in the capacitor, between both ends of the capacitor.
- Generates a time integral value of the current output from the photodetecting element that is, a voltage proportional to the charge. Since this voltage is input to the comparator, when the voltage corresponding to the amount of charge exceeds the reference voltage, the output of the comparator is switched. The time from the reference time to the comparator switching time is inversely proportional to the amount of charge output from the photodetecting element.
- the eighth optical semiconductor integrated circuit device is the seventh optical semiconductor integrated circuit device, wherein the conversion coefficient control means controls the capacitance of the capacitor according to the input signal, and the conversion coefficient depends on the capacitance. It is characterized by doing.
- the conversion factor can also be determined by controlling the capacitance of the force capacitor that defines the conversion factor of charge to voltage. The conversion factor can be controlled.
- the ninth optical semiconductor integrated circuit device is the same as the seventh or eighth optical semiconductor integrated circuit device, wherein the ratio of the current flowing through the input side line and the output side line of the current mirror circuit is variable. And the other line is the output line, and the conversion coefficient control means controls this current ratio according to the input signal, and the conversion coefficient depends on this current ratio. .
- the conversion coefficient may be determined by the amount of charge flowing into the capacitor per unit time.
- the current flowing into the capacitor can be controlled by the ratio of the current flowing through the input side line and the output side line of the current mirror.
- the tenth optical semiconductor integrated circuit device is the same as the first optical semiconductor integrated circuit device, wherein the conversion coefficient control means corresponds to a counter for counting the number of input pulses of the input / output terminal force and an output of the force counter. And a decoder for determining the transform coefficient.
- the conversion coefficient is determined in association with the output of the counter, for example, it is possible to control the combined capacity of the capacitor to be the conversion coefficient, so that the detection sensitivity can be adjusted according to the input signal of the external force. it can.
- An eleventh optical semiconductor integrated circuit device is the sixth optical semiconductor integrated circuit device, wherein the time measuring means includes a first one-shot circuit that generates a one-shot pulse in response to an input of a reset signal, and a comparator The second one-shot circuit that generates a one-shot pulse in response to the switching of the output and the flip-flop that switches the output in accordance with the outputs of the first and second one-shot circuits.
- the output of the flip-flop is a reset signal (pulse of the first one-shot circuit) that gives the reference time of time measurement, and an output of the comparator that gives the end time of time measurement (pulse of the second one-shot circuit) Therefore, it is possible to output a time measurement signal, that is, a square wave having a pulse width proportional to the amount of light incident on the light detection element.
- a twelfth optical semiconductor integrated circuit device is the eleventh optical semiconductor integrated circuit device, wherein the charge voltage conversion means includes a current mirror circuit in which one line is connected to the photodetecting element, a current mirror circuit A capacitor having a variable capacitance connected to the other line and a connection switch for connecting the other line to the capacitor are provided. The output of the flip-flop generated in synchronization with the input of the reset signal is used to charge the capacitor. The connection switch is connected so that is stored.
- a reference time for time measurement is given in synchronization with the input of the reset signal, the connection switch is connected, and charge accumulation in the capacitor starts.
- the charge voltage conversion means further includes a discharge switch for connecting the capacitor and a fixed potential, and the second one-shot circuit A discharge switch is connected so that the charge accumulated in the capacitor is discharged by the output of the flip-flop generated in synchronization with the output.
- a discharge switch is connected to discharge the charge accumulated in the capacitor to a fixed potential. Since charge accumulation and discharge depend on the polarity of the charge, if a fixed potential is connected to a positive power supply, etc., positive charge will flow in when the discharge switch is connected. It can be understood that negative charge is stored in the capacitor during storage, and that negative charge is discharged during discharge. In addition, a configuration in which the difference between the charge amounts during storage and discharge is used as the output voltage of the capacitor is also conceivable.
- a fourteenth optical semiconductor integrated circuit device is the seventh optical semiconductor integrated circuit device, wherein a dummy photodetecting element connected in parallel to the photodetecting element via a current mirror circuit, and a dummy photodetecting device And a light-shielding body provided on the element. Since the light incident on the dummy light detection element is blocked by the light shield, a dark current flows through the line on the dummy light detection element side of the current mirror circuit. Since this dark current can be estimated to be equal to the dark current flowing through the light detection element for light detection, the current from which the dark current has been removed flows through the other line of the current mirror circuit connected to the capacitor side. It becomes.
- the invention's effect [0036] According to the optical semiconductor integrated circuit device of the present invention, the sensitivity can be changed with a simple configuration, and the dynamic range can be widened.
- FIG. 1 is a plan view of an optical semiconductor integrated circuit device (optical IC).
- FIG. 2 is a circuit diagram for explaining a circuit formed on a monolithic semiconductor chip of an optical IC.
- FIG. 3 is a circuit diagram of a charge-voltage conversion circuit.
- FIG. 4 is a graph showing a temporal change in the voltage V across the capacitor.
- FIG. 5 is a circuit diagram of a time measurement circuit.
- FIG. 6 is an input / output correspondence table of SR flip-flops.
- FIG. 7 is a circuit diagram of a conversion coefficient control circuit.
- FIG. 8 is an input / output correspondence table showing an example of decoder output.
- FIG. 9 is a timing chart of various signals.
- FIG. 10 is a graph showing the relationship of the pulse width (s) to the incident light quantity (a.u.).
- FIG. 11 is a graph showing the relationship of relative sensitivity (a.u.) to wavelength (nm).
- FIG. 12 is a partial circuit diagram of an optical IC provided with a dummy photodetecting element and a light shielding body.
- FIG. 1 is a plan view of an optical semiconductor integrated circuit device (optical IC) 100.
- the optical IC 100 includes a monolithic semiconductor chip 10 molded in a resin package 11, and four lead pins 1, 2, 3, 4 are electrically connected to the semiconductor chip 10. Each extends from the inside of the resin package 11 to the outside.
- Lead pin 1 is a reset terminal
- lead pin 2 is a GND (ground) terminal
- lead pin 3 is a power supply terminal
- lead pin 4 is an input / output terminal.
- FIG. 2 is a circuit diagram for explaining a circuit formed on the monolithic semiconductor chip 10 of the optical IC.
- the optical IC 100 is connected to the computer CP via the lead pins 1 to 4. From reset terminal 1, reset signal RESET is input from computer CP, input / output terminal 4 receives computer CP force input signal INPUT, and output signal OUTPUT is output from the inside.
- the ground terminal 2 is grounded, the power terminal 3 is grounded via the power source 31, and a capacitor 32 is inserted in parallel with the power source 31.
- the semiconductor chip 10 of the optical IC 100 includes a light detection element (photodiode in this example) 10a and a charge-voltage conversion circuit (means) 10b that generates a voltage V corresponding to the amount of charge output from the light detection element 10a. And the comparator 10c to which this voltage V is input, and the reference time t force is also the comparator 10c.
- Time measurement circuit (means) 10d that measures the time T until the output of the switch changes, and the charge voltage
- a conversion coefficient of the conversion circuit 10b (conversion coefficient control circuit (means) 10f for controlling X) and an AND gate 10g for preventing the output from the time measurement circuit from entering the conversion coefficient control circuit are provided.
- the optical IC 100 inputs the input signal INPUT to the conversion coefficient control circuit 1 Of from the outside and inputs the output signal OUTPUT from the time measurement circuit 10d to the outside. It is equipped with an output shared terminal 4.
- the semiconductor chip 10 of the optical IC 100 further includes a tri-state buffer 10e for connecting the time measurement circuit 10d and the input / output terminal 4 to the tri-state buffer, and the 10d enable signal (control signal: reset) In response to the input of the signal (RESET), the time measuring circuit 1 Od and the input / output terminal 4 are substantially connected and disconnected.
- the tri-state buffer (inverter) 10e is a type of buffer that can set the output of a normal buffer or inverter to high impedance according to the level of the enable signal. High impeder The state is the same as when the output terminal is disconnected from the internal circuit force.
- the time measurement circuit 10d and the input / output terminal 4 are separated as necessary by the tristate buffer 10e, and the input signal INPUT input from the input / output terminal 4 is converted into the conversion coefficient control circuit 10f at the time of separation. Is input.
- the enable signal is also input to the reset terminal.
- the tri-state buffer 10e can be replaced with a connection switch, or a signal may be amplified by placing a buffer before or after the connection switch.
- the photodetection element 10a, the charge voltage conversion circuit 10b, the comparator 10c, the time measurement circuit 10d, the conversion coefficient control circuit 1 Of, the tristate buffer 10e, and the AND gate 10g are the resin package 11 (See Fig. 1).
- the input / output terminal 4 extending from the inside of the resin package 11 to the outside is electrically connected to the control computer CP, the input signal INPUT from the computer CP can be received via the input / output terminal 4.
- the output signal OUTPUT can be input to the computer CP.
- the resin package 11 protects each molded element and is transparent in the wavelength band from ultraviolet to infrared, so that light can enter the light detection element 10a through the resin package 11. Yes (see Figure 1).
- the resin package 11 has the advantage of being lightweight.
- the pulse width is inversely proportional to the amount of light incident on the light detection element 10a, that is, the amount of charge q output from the light detection element 10a.
- the input signal from the input / output terminal 4 is input to the conversion coefficient control circuit 10f, and changes the conversion coefficient a of the charge voltage conversion circuit 10b.
- K is the multiplication factor of the current mirror circuit
- Cx is the combined capacity, each of which can be changed.
- the magnitude of the input signal V to the comparator 10c can be controlled by adjusting the conversion coefficient a. That is, even when the charge amount q is large, the input to the comparator 10c can be reduced by reducing the conversion coefficient a. In this case, the voltage change amount is also small with respect to the change amount of the charge amount. Low accuracy, low sensitivity, and high light intensity.
- the sensitivity can be changed from the outside and the output of the light quantity measurement can be taken out from the input / output terminal 4. Therefore, the sensitivity can be changed with a simple configuration. Thereby, the dynamic range can be easily expanded.
- the conversion coefficient ⁇ is switched when the reset signal RESET that cuts off the tristate buffer 10e is input.
- the input signal INPUT is input as follows.
- (A) Time Measurement Circuit An input signal is input to the conversion coefficient control circuit 10 f via the input / output terminal 4 during the disconnection period between the lOd and the input / output terminal 4. That is, when the enable signal (RESET) is input, the time measurement circuit 10d and the input / output terminal 4 are connected / disconnected, but during the disconnection period, the conversion coefficient control circuit is connected via the input / output terminal 4 1 Input signal INPUT input to Of does not affect the time measurement circuit 1 Od. At this time, since the enable signal (RESET) is H level, the signal input to the input / output terminal 4 is input to the conversion coefficient control circuit by the AND gate 10g.
- the time measurement circuit 10 d measures the time T within the connection period between the time measurement circuit 10 d and the input / output terminal 4. During the connection period, the time measuring circuit 10d
- a signal obtained by measuring 0 0 can be taken out from the input / output terminal 4.
- the enable signal (RESET) power level since the enable signal (RESET) power level, the output of the time measuring circuit is not input to the conversion coefficient control circuit by the AND gate.
- the enable signal (RESET) input to the reset terminal 1 is also used as the reset signal RESET that gives the reference time t of the time measurement circuit 10d.
- the time measurement circuit 10d is connected in this way.
- the reset terminal 1 is a dual-purpose input terminal for the reset signal RESET that also functions as an enable signal (RESET).
- RESET enable signal
- the input of the reset signal RESET gives a reference time t for time measurement by the time measurement circuit 10d.
- connection between the time measuring circuit 10d and the input / output terminal 4 can be disconnected to eliminate the influence of the external input signal INPUT to the input / output terminal 4 on the time measuring circuit 10d.
- FIG. 3 is a circuit diagram of the charge-voltage conversion circuit.
- the charge-voltage conversion circuit 10b includes a current mirror circuit CM in which one line is connected to the photodetecting element 10a, and a variable capacitor capacitor connected to the other line in the current mirror circuit CM. .
- the charge that is proportional to the time integral value of this current is accumulated in the capacitor Cx (for convenience, the combined capacitance is indicated by Cx), and between the two ends of the capacitor Cx, there is a photodetection element 10a.
- the ratio of the current flowing through the input side line and the output side line of the current mirror circuit CM is variable, and one line connected to the photodetecting element 10a is used as an input side line, and the other line is used as an output side line.
- a transistor TO is interposed in series on the input side line, and transistors Tl, ⁇ 2 and ⁇ 3 are arranged in parallel on the output side line with a common gate.
- the ONZOFF of the current flowing through each transistor T1, ⁇ 2, ⁇ 3 is the switch SW, SW, SW
- the conversion coefficient control circuit 10f controls this current ratio according to the input signal INPUT.
- the conversion coefficient ⁇ is determined by the amount of charge flowing into the capacitor Cx per unit time.
- the current flowing into the capacitor Cx is controlled by the ratio of the current flowing through the input side line and output side line of the current mirror CM.
- a connection switch SW is provided between the output side line of the current mirror circuit CM and the variable capacitor Cx. Reset signal Synchronized with RESET input
- Q H level: switch connection
- the reference time t for time measurement is given in synchronization with the power, and the connection switch SW is connected.
- the charge-voltage conversion circuit 10b further includes a discharge switch SW for connecting the capacitor Cx and a fixed potential (in this example, the ground potential), and a second specific output when the comparator 10c is switched (
- connection switch S in synchronization with the falling time of the reset signal (reference time t), the connection switch S
- FIG. 4 is a graph showing a temporal change in the voltage V across the capacitor.
- FIG. 5 is a circuit diagram of the time measuring circuit 10d.
- the time measurement circuit 10d responds to the input of the reset signal RESET (voltage is V).
- the one-shot pulse generator (the comparator output voltage is V) according to the switching of the output of the first one-shot circuit OS1 that generates the one-shot pulse and the comparator 10c (in this example, the falling time)
- FIG. 6 is an input / output correspondence table of the SR flip-flop.
- the SR (set reset) flip-flop FF is the most basic flip-flop FF, and has a set input terminal S, a reset input terminal R, an output terminal Q, and Q bar (Q NOT). .
- output terminal Q retains the previous state. If terminal S is 0 and terminal R is 1, terminal Q is 0. If terminal S is 1 and terminal R is 0, terminal Q is 1. It is forbidden for both terminals S and R to be 1.
- the H level is “0” (switch connection), and the L level is “1” (switch disconnection).
- the output of the flip-flop FF is a reset signal (first output) that gives a reference time t for time measurement.
- One-shot circuit OS1 noise input to S pin at L level
- time measurement end time t Output of comparator 10c second one-shot circuit OS2 pulse: L level at R pin
- the flip-flop FF can output a time measurement signal, that is, a square wave having a pulse width proportional to the amount of light incident on the photodetecting element 10a.
- the time measurement end time t is given by the output of the second one-shot circuit OS2 (L level at the R terminal), so Q becomes L level (switch disconnection), and Q
- the charge stored in the capacitor Cx is discharged to a fixed potential.
- FIG. 7 is a circuit diagram of the conversion coefficient control circuit.
- the conversion coefficient control circuit 10f includes a power counter 10f that counts the number of input pulses from the input / output terminal 4 and a decoder 10f that determines the conversion coefficient ⁇ according to the output of the counter 10f.
- the conversion coefficient ⁇ is determined in association with the output of the counter 10f, for example, the composite capacity Cx of the capacitor can be controlled so as to become the conversion coefficient ⁇ , so the dynamic range and detection sensitivity can be adjusted according to the external input signal INPUT Can be adjusted.
- the conversion coefficient a is proportional to the current ratio K
- the current ratio K can be changed in correspondence with the output of the counter 10f.
- Capacitor Cx has a plurality of capacitors Cl, C2, C3 connected in parallel between the input terminal of comparator 10c and the ground potential, and each capacitor Cl, C2, C3 is effectively used.
- a plurality of switches SW 1, SW 2, SW that connect the input terminal (inverted input terminal) of the comparator 10 c and the capacitors Cl, C 2, C 3 are connected. This connection
- the larger the number, the larger the combined capacitance Cx, the lower the sensitivity, and the ability to handle even high light intensity. [0085] Also, the larger the number of switches SW, SW, SW on the current mirror side, the larger the current The ratio K increases, sensitivity increases, and the amount of light that can be accommodated decreases. Note that the conversion coefficient ⁇ KZCx. The number of transistors can be adjusted on both the input and output sides.
- FIG. 8 is an input / output correspondence table showing an example of the output of the decoder.
- a bit indicating connection of each switch is “0”, and a bit indicating disconnection is “1”.
- the number of input pulses is 0 to 8
- counter output and decoder output are shown.
- the number of pulses of the input signal INPUT is 0 to 2
- the sensitivity ranges indicate low (L), medium (M), and high (H), respectively. The greater the number of input pulses, the lower the sensitivity.
- FIG. 9 is a timing chart of various signals.
- the tri-state buffer 10e is disconnected, the input / output terminal 4 functions as an input pin, and the conversion coefficient ⁇ is adjusted. For example, when the sensitivity range is L, two pulses are input and the capacitors C1 to C3 are all connected, resulting in low sensitivity.
- the level is input, the output Q of the time measurement circuit 10d (flip-flop FF) becomes L level, and charge discharge is performed. Until the next reset signal is input, the tri-state buffer 10e is connected, and the input / output terminal 4 functions as an output pin. From the time measurement circuit 10d, a square wave having a pulse width T proportional to the amount of light is output.
- FIG. 10 is a graph showing the relationship of the pulse width (s) to the incident light amount (a.u.).
- the pulse width can be changed according to the sensitivity range L, M, H.
- the graph is a graph when the power supply potential is 3 V, the wavelength of incident light is 650 nm, and the temperature is 25 ° C.
- FIG. 11 is a graph showing the relationship of relative sensitivity (a.u.) to wavelength (nm).
- the photodetecting element 10a in this example is a silicon photodiode and has sensitivity to light from ultraviolet rays to infrared rays. Since the above-described resin package 11 is transparent, it transmits these lights.
- FIG. 12 is a partial circuit diagram of an optical IC provided with a dummy photodetecting element and a light shield.
- a dummy photodetecting element 10a ′ connected in parallel to the photodetecting element 10a via a current mirror circuit CM, and a light shield SLD provided on the dummy photodetecting element 10a ′. are further provided. Since the light incident on the dummy photodetector 10a 'is blocked by the light shield SLD, the dummy photodetector of this current mirror circuit CM
- this dark current can be estimated to be equal to the dark current flowing in the photodetecting element 10a for photodetection, the dark current is present in the other line of the current mirror circuit CM connected to the capacitor Cx side. The removed current flows.
- the present invention can be used for an optical semiconductor integrated circuit device.
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Light Receiving Elements (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004205243A JP4664017B2 (ja) | 2004-07-12 | 2004-07-12 | 光半導体集積回路装置 |
JP2004-205243 | 2004-07-12 |
Publications (1)
Publication Number | Publication Date |
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WO2006006574A1 true WO2006006574A1 (ja) | 2006-01-19 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/012793 WO2006006574A1 (ja) | 2004-07-12 | 2005-07-11 | 光半導体集積回路装置 |
Country Status (3)
Country | Link |
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JP (1) | JP4664017B2 (ja) |
TW (1) | TW200616213A (ja) |
WO (1) | WO2006006574A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014153260A (ja) * | 2013-02-12 | 2014-08-25 | Seiko Epson Corp | 半導体集積回路、発振器、電子機器、移動体および半導体集積回路の検査方法 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7786422B2 (en) * | 2005-09-21 | 2010-08-31 | Rjs Technology, Inc. | System and method for a high dynamic range sensitive sensor element or array |
JP5292689B2 (ja) * | 2006-10-31 | 2013-09-18 | 日本電気株式会社 | 熱型赤外線撮像装置及びその動作方法 |
US8124922B2 (en) * | 2008-05-21 | 2012-02-28 | Semiconductor Energy Laboratory Co., Ltd. | Photoelectric conversion device including photoelectric conversion element and amplifier circuit having a thin film transistor |
US8207487B2 (en) * | 2008-06-25 | 2012-06-26 | Semiconductor Energy Laboratory Co., Ltd. | Photoelectric conversion device including charge/discharge circuit |
US9207116B2 (en) | 2013-02-12 | 2015-12-08 | Gentex Corporation | Light sensor |
US9870753B2 (en) | 2013-02-12 | 2018-01-16 | Gentex Corporation | Light sensor having partially opaque optic |
JP6219517B2 (ja) * | 2013-07-26 | 2017-10-25 | ジェンテックス コーポレイション | 部分的に不透明なオプティックを持つ光センサー |
JP2016092661A (ja) * | 2014-11-07 | 2016-05-23 | ソニー株式会社 | 撮像素子および駆動方法、並びに電子機器 |
JP6747774B2 (ja) * | 2015-03-19 | 2020-08-26 | キヤノンメディカルシステムズ株式会社 | 集積回路、光子検出装置、及び放射線分析装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07135327A (ja) * | 1993-11-11 | 1995-05-23 | Sharp Corp | 受光ユニット |
JPH11108992A (ja) * | 1997-10-01 | 1999-04-23 | Denso Corp | 半導体集積回路及び電子装置 |
JP2001257593A (ja) * | 2000-03-10 | 2001-09-21 | Hamamatsu Photonics Kk | 信号処理回路 |
JP2002286504A (ja) * | 2001-03-27 | 2002-10-03 | Citizen Watch Co Ltd | 光センサ回路およびこれを用いた光学式変位測長器 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4473425B2 (ja) * | 2000-07-31 | 2010-06-02 | 浜松ホトニクス株式会社 | 光検出装置 |
-
2004
- 2004-07-12 JP JP2004205243A patent/JP4664017B2/ja not_active Expired - Fee Related
-
2005
- 2005-07-11 WO PCT/JP2005/012793 patent/WO2006006574A1/ja active Application Filing
- 2005-07-12 TW TW094123577A patent/TW200616213A/zh unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07135327A (ja) * | 1993-11-11 | 1995-05-23 | Sharp Corp | 受光ユニット |
JPH11108992A (ja) * | 1997-10-01 | 1999-04-23 | Denso Corp | 半導体集積回路及び電子装置 |
JP2001257593A (ja) * | 2000-03-10 | 2001-09-21 | Hamamatsu Photonics Kk | 信号処理回路 |
JP2002286504A (ja) * | 2001-03-27 | 2002-10-03 | Citizen Watch Co Ltd | 光センサ回路およびこれを用いた光学式変位測長器 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014153260A (ja) * | 2013-02-12 | 2014-08-25 | Seiko Epson Corp | 半導体集積回路、発振器、電子機器、移動体および半導体集積回路の検査方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2006032438A (ja) | 2006-02-02 |
JP4664017B2 (ja) | 2011-04-06 |
TW200616213A (en) | 2006-05-16 |
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