WO2010010661A1 - Ad変換装置 - Google Patents
Ad変換装置 Download PDFInfo
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- WO2010010661A1 WO2010010661A1 PCT/JP2009/003116 JP2009003116W WO2010010661A1 WO 2010010661 A1 WO2010010661 A1 WO 2010010661A1 JP 2009003116 W JP2009003116 W JP 2009003116W WO 2010010661 A1 WO2010010661 A1 WO 2010010661A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
- H03M1/125—Asynchronous, i.e. free-running operation within each conversion cycle
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/34—Analogue value compared with reference values
- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
- H03M1/46—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter
- H03M1/462—Details of the control circuitry, e.g. of the successive approximation register
Definitions
- the present invention relates to an AD conversion apparatus.
- the present invention relates to an asynchronous successive approximation AD converter.
- This application is related to the following US applications and claims priority from the following US applications: For designated countries where incorporation by reference of documents is permitted, the contents described in the following application are incorporated into this application by reference and made a part of this application.
- Asynchronous successive approximation AD converters are known (see, for example, Patent Document 1 and Non-Patent Document 1).
- Asynchronous successive approximation AD converters perform bit-by-bit conversion processing without synchronizing with a clock.
- the comparator starts the comparison operation.
- the conversion period becomes long when the comparator starts the comparison operation after a long time has elapsed since the comparison signal output from the DAC was set. Accordingly, it is preferable that the asynchronous successive approximation AD converter starts comparison between the input signal and the comparison signal at an earlier timing after the comparison signal output from the DAC is set.
- a successive approximation AD converter that outputs digital output data corresponding to an analog input signal.
- a bit selection unit that sequentially selects from the upper side, a data control unit that outputs comparison data for determining the value of the conversion target bit each time a conversion target bit is selected, and an analog comparison according to the comparison data
- a DA conversion unit that outputs a signal, a timing generation unit that outputs a comparison control signal instructing the start of comparison at a timing delayed for a predetermined time after the comparison data is supplied to the DA conversion unit, and a bit to be converted is a higher-order bit
- the timing of the comparison control signal according to the bit position of the bit to be converted so that the comparison start timing indicated in the comparison control signal is later
- a comparison unit that starts comparison of the input signal and the comparison signal at the timing of the comparison start indicated by the comparison control signal whose timing has been changed by the change unit, and the comparison unit outputs the comparison result After that, a completion
- FIG. 1 shows a configuration of an AD conversion apparatus 10 according to the present embodiment.
- FIG. 2 shows an operation flow of the sequence control unit 34.
- FIG. 3 shows an example of a timing chart of signals in the AD conversion apparatus 10.
- FIG. 4 shows an operation flow during the asynchronous successive approximation processing (step S14 in FIG. 2) of the AD conversion apparatus 10.
- FIG. 5 shows an example of a timing chart of signals in the AD conversion apparatus 10 during the asynchronous successive approximation process (step S14 in FIG. 2) of the AD conversion apparatus 10.
- FIG. 6 shows an example of comparison data generation processing by the data control unit 18.
- FIG. 7 shows an example of the configuration of the comparison unit 26 according to the present embodiment.
- FIG. 8 shows an example of the configuration of the completion detection unit 30 according to the present embodiment.
- FIG. 10 shows a configuration of the AD conversion apparatus 10 according to a first modification of the present embodiment.
- FIG. 11 shows an example of the delay amount stored in the memory 40 according to the first modification of the present embodiment.
- FIG. 12 shows a configuration of the AD conversion apparatus 10 according to the second modification of the present embodiment.
- FIG. 13 shows an example of a processing flow during calibration of the AD conversion apparatus 10 according to the second modification.
- FIG. 14 shows a configuration of an AD conversion apparatus 10 according to a third modification of the present embodiment.
- FIG. 10 shows a configuration of the AD conversion apparatus 10 according to a first modification of the present embodiment.
- FIG. 11 shows an example of the delay amount stored in the memory 40 according to the first modification of the present embodiment.
- FIG. 12 shows a configuration of the AD conversion apparatus 10 according to the second modification of the present embodiment.
- FIG. 13 shows an example of a processing flow during calibration of the AD conversion apparatus 10 according to the second modification.
- FIG. 14 shows a configuration of an AD conversion apparatus 10 according to a third
- FIG. 15 shows a configuration of an AD conversion apparatus 10 according to a fourth modification of the present embodiment.
- FIG. 16 shows a configuration of an AD conversion apparatus 10 according to a fifth modification of the present embodiment.
- FIG. 17 shows an example of a timing chart of signals in the AD conversion apparatus 10 according to the fifth modification shown in FIG.
- FIG. 18 shows the configuration of the DA conversion unit 20 according to the sixth modification of the present embodiment, together with the comparison unit 26.
- FIG. 19 shows the configuration of the DA conversion unit 20 according to the seventh modification of the present embodiment, together with the comparison unit 26.
- FIG. 1 shows a configuration of an AD conversion apparatus 10 according to the present embodiment.
- the AD converter 10 is an asynchronous successive approximation type AD (ANALOG TO DIGITAL) converter, and outputs digital output data corresponding to an analog input signal.
- AD converter 10 converts the voltage value V IN of the analog input signal N bits (N is an integer of 2 or more) to the digital output data D O of.
- the AD conversion apparatus 10 includes an S / H circuit 14, a bit selection unit 16, a data control unit 18, a DA conversion unit 20, a timing generation unit 22, a change unit 24, a comparison unit 26, and a holding unit 28.
- the S / H circuit 14 samples the input signal. Then, the S / H circuit 14 holds the sampled analog input signal.
- the bit selection unit 16 sequentially selects the conversion target bits from the higher order side of the output data in response to the conversion start signal or the completion signal being given. For example, the bit selection unit 16 may sequentially select the conversion target bits bit by bit from the most significant bit (Nth bit) to the least significant bit (first bit) of the output data.
- the data control unit 18 generates comparison data for determining the value of the conversion target bit every time the conversion target bit is selected by the bit selection unit 16. That is, the data control unit 18 outputs comparison data representing a comparison signal for determining whether the value of the conversion target bit of the output data is 0 or 1. Then, the data control unit 18 outputs the generated comparison data to the DA conversion unit 20. Details of the method for generating the comparison data will be described with reference to FIG.
- the DA conversion unit 20 outputs an analog comparison signal corresponding to the comparison data given from the data control unit 18. That is, the DA conversion unit 20 performs DA conversion each time comparison data is given from the data control unit 18.
- the DA converter 20 may be a capacitor array type DA converter.
- the timing generator 22 outputs a comparison control signal instructing the start of comparison at a timing delayed for a predetermined time after the comparison data is supplied to the DA converter 20. Further, the timing generator 22 outputs a comparison control signal instructing reset at a timing delayed for a predetermined time after instructing the start of comparison.
- the timing generation unit 22 may generate a pulse-shaped comparison control signal in which a leading edge (for example, a rising edge) indicates a comparison start and a tail edge (for example, a falling edge) indicates a reset.
- the change unit 24 changes the timing of the comparison control signal output by the timing generation unit 22 so that the comparison start timing indicated in the comparison control signal is delayed when the conversion target bit is a higher bit. That is, the changing unit 24 indicates the time from when the comparison data is supplied to the DA converting unit 20 until the comparing unit 26 starts the comparison operation (waiting time of the comparing unit 26), when the conversion target bit is the lower bit. Control is performed so that the higher bit is longer.
- the changing unit 24 may change the timing of the comparison control signal by delaying the comparison control signal output from the timing generating unit 22 by a delay amount corresponding to the position of the conversion target bit. Then, the changing unit 24 gives the comparison control signal whose timing has been changed to the comparing unit 26. Note that the changing unit 24 may change the timing of the comparison control signal so that some of the adjacent bits with the same waiting time among all the bits of the output data are included.
- the comparison unit 26 starts the comparison between the input signal and the comparison signal at the comparison start timing indicated in the comparison control signal whose timing is changed by the changing unit 24. For example, when the leading edge (for example, the rising edge) of the comparison control signal indicates the start of comparison, the comparison unit 26 may start the comparison operation at the timing of the leading edge of the comparison control signal. After starting the comparison operation, the comparison unit 26 outputs a comparison result obtained by comparing the input signal with the comparison signal. Note that the comparison unit 26 causes a delay between the start of the comparison operation and the output of the comparison result. The delay time from when the comparison unit 26 starts the comparison operation until the comparison result is output is hereinafter referred to as response time.
- the comparison unit 26 may output a logical value indicating whether the input signal is larger than the comparison signal as a comparison result. For example, the comparison unit 26 may output 1 when the input signal is larger than the comparison signal, and output 0 when the input signal is equal to or less than the comparison signal.
- the comparison unit 26 resets the comparison result at the reset timing indicated in the comparison control signal whose timing is changed by the changing unit 24. For example, when the tail edge (for example, the falling edge) of the comparison control signal indicates reset, the comparison unit 26 may start the reset operation at the timing of the tail edge of the comparison control signal. For example, the comparison unit 26 may output a predetermined logical value (for example, one of 0 or 1) in response to the comparison result being reset.
- the period from when the comparison unit 26 is instructed to start comparison until the comparison unit 26 is reset is a comparison period, and after the comparison unit 26 is reset, the comparison unit 26 is next instructed to start comparison. The period until it is given is called a reset period.
- the comparison unit 26 outputs a comparison result between the input signal and the comparison signal in response to the DA conversion unit 20 outputting the comparison signal, and is reset after outputting the comparison result.
- the comparison unit 26 outputs a differential comparison result. That is, the comparison unit 26 outputs a positive result signal and a negative result signal that represent the comparison result as a differential logic value in the comparison period. Further, the comparison unit 26 outputs a positive result signal and a negative result signal representing a logic value fixed to one value in the reset period.
- the holding unit 28 takes in the comparison result in response to the output of the comparison result from the comparison unit 26 and holds the taken comparison result. Even when the comparison result of the comparison unit 26 is reset, the holding unit 28 continues to hold the acquired comparison result until the comparison unit 26 outputs a new comparison result next time.
- the holding unit 28 holds a differential comparison result. Instead of this, the holding unit 28 may hold one of the differential comparison results (for example, a positive comparison result).
- the completion detection unit 30 outputs a completion signal that causes the bit selection unit 16 to select the next conversion target bit after the comparison unit 26 outputs the comparison result.
- the completion detection unit 30 detects that the comparison unit 26 has output the comparison result, and outputs a completion signal prior to resetting the comparison unit 26.
- the completion detection unit 30 may output a completion signal at a timing when the logical value of the positive result signal of the comparison unit 26 and the logical value of the negative result signal do not match.
- Such a completion detection unit 30 can transition the conversion target bit selected by the bit selection unit 16 from the current bit to the next lower bit.
- the output unit 32 determines the value of each bit of the output data based on the comparison result output by the comparison unit 26. For example, when the conversion target bit is selected, the output unit 32 sets the value of the bit to which the comparison result that the input signal is larger than the comparison signal is 1 and the comparison result that the input signal is equal to or less than the comparison signal. The value of the bit that is output may be 0. And the output part 32 outputs output data outside according to having determined the value of all the bits of output data. The output unit 32 continues to output the output data until the next output data is determined.
- the sequence control unit 34 controls the overall operation of the AD conversion apparatus 10.
- the sequence control unit 34 receives a clock representing a sampling period from the outside. Then, in response to receiving the clock, the sequence control unit 34 generates a sample signal designating a sample period and a hold period, and supplies the sample signal to the S / H circuit 14. Further, the sequence control unit 34 generates a conversion start signal in response to receiving the clock and supplies the conversion start signal to the bit selection unit 16.
- FIG. 2 shows an operation flow of the sequence control unit 34.
- the sequence control unit 34 executes the processing from step S12 to step S15 for each sampling period (each time a clock is given) (S11, S16).
- the sequence control unit 34 causes the S / H circuit 14 to sample the input signal (S12).
- the sequence control unit 34 causes the S / H circuit 14 to hold the sampled input signal (S13). Thereafter, the sequence controller 34 keeps the S / H circuit 14 holding the input signal.
- sequence control unit 34 gives a conversion start signal to the bit selection unit 16 and causes the bit selection unit 16 or the like to execute asynchronous sequential comparison processing (S14).
- S14 asynchronous sequential comparison processing
- the sequence control unit 34 can cause the output unit 32 to output output data corresponding to the input signal as a result of causing the bit selection unit 16 or the like to execute the asynchronous sequential comparison process. Next, the sequence control unit 34 pauses the operation of the AD conversion apparatus 10 until the next sampling period is started (S15). Thereby, the sequence control unit 34 can suppress the power consumed by the AD converter 10.
- FIG. 3 shows an example of a timing chart of signals in the AD conversion apparatus 10.
- the sequence control unit 34 is given a clock for each sampling period (time t11, t16). Note that the sampling period may be a fixed period or a period that varies as appropriate.
- the sequence control unit 34 When the sequence control unit 34 receives the clock, the sequence signal is set to, for example, logic H, and the S / H circuit 14 starts the sampling operation (time t12).
- the S / H circuit 14 samples the input signal in a period in which the sample signal is, for example, H logic (time t12 to t13).
- the sequence control unit 34 sets the sample signal to L logic, for example, and starts the hold operation in the S / H circuit 14 after a certain period of time has elapsed from setting the sample signal to H logic (time t13).
- the S / H circuit 14 holds the sampled input signal during a period in which the sample signal is, for example, L logic (time t13 to time t16).
- the sequence control unit 34 causes the S / H circuit 14 to start a hold operation, and then gives a conversion start signal to the bit selection unit 16 (time t13).
- the bit selection unit 16 and the like execute asynchronous sequential comparison processing (time t14 to t15).
- the sequence control unit 34 pauses the operation of the AD conversion apparatus 10 until a clock is next applied (time t15 to t16).
- FIG. 4 shows an operation flow during the asynchronous successive approximation process (step S14 in FIG. 2) of the AD conversion apparatus 10.
- the bit selection unit 16 determines whether or not the currently selected conversion target bit is the least significant bit (S22). ).
- the bit selection unit 16 selects a new conversion target bit from each bit of the output data (S23). More specifically, when receiving the conversion start signal, the bit selection unit 16 selects the most significant bit of the output data as the conversion target bit. In addition, when receiving a completion signal, the bit selection unit 16 selects a bit one bit lower than the current conversion target bit as a new conversion target bit.
- the bit selection unit 16 selects a new conversion target bit
- the data control unit 18 generates comparison data for determining the value of the selected conversion target bit and outputs the comparison data to the DA conversion unit 20. (S24). Details of the method for generating the comparison data will be described with reference to FIG.
- the comparison unit 26 waits for comparison processing for a time (settling time) from when the comparison data is supplied to the DA conversion unit 20 until the comparison signal output from the DA conversion unit 20 is stabilized (S26). ). Next, after the settling time has elapsed, the comparison unit 26 starts a comparison operation between the input signal and the comparison signal (S27).
- the comparison unit 26 outputs a comparison result obtained by comparing the input signal and the comparison signal (S28).
- the output unit 32 determines the value of the conversion target bit of the output data in response to the comparison unit 26 outputting the comparison result (S30). For example, the output unit 32 sets the value of the conversion target bit to 1 when the comparison result that the input signal is larger than the comparison signal is output, and outputs the comparison result that the input signal is equal to or less than the comparison signal. May determine the value of the bit to be converted as 0. Then, the comparison unit 26 is reset after a predetermined comparison period has elapsed since the start of the comparison operation (S31).
- the completion detection unit 30 detects that the comparison unit 26 has output the comparison result, and outputs a completion signal prior to resetting the comparison unit 26 (S29).
- the completion detection unit 30 detects the timing at which the logical value of the positive-side result signal and the logical value of the negative-side result signal of the comparison unit 26 do not match, so that the comparison unit 26 outputs the comparison result. You may detect that.
- the bit selection unit 16 can receive a completion signal before the comparison unit 26 is reset (S21), so that the processing of the next bit can be started earlier.
- the bit selecting unit 16 selects all the bits from the most significant bit to the least significant bit of the output data (Yes in S22), the bit selecting unit 16 notifies the output unit 32 that the processing has been completed up to the least significant bit. Then, the process proceeds to step S32.
- the output unit 32 receives a notification from the bit selection unit 16 that processing has been completed up to the least significant bit, the output unit 32 outputs the values of all the bits of the output data to the outside (S32).
- the output unit 32 ends the asynchronous successive approximation process.
- FIG. 5 shows an example of a timing chart of signals in the AD conversion apparatus 10 during the asynchronous successive approximation process (step S14 in FIG. 2) of the AD conversion apparatus 10.
- the bit selection unit 16 selects the most significant bit (Nth bit) as a conversion target bit (time t22).
- the data control unit 18 outputs comparison data for determining the value of the conversion target bit to the DA conversion unit 20 (time t23).
- the DA converter 20 outputs a comparison signal in response to receiving the comparison data.
- the comparison unit 26 receives an instruction to start comparison after the comparison signal is set (time t24), and starts the comparison operation between the input signal and the comparison signal.
- the comparison unit 26 outputs the comparison result after the response time has elapsed after receiving the comparison start instruction (t25). Then, the comparison unit 26 is reset after a lapse of a certain period after receiving the comparison start instruction (t26).
- the timing generation unit 22 makes the period (comparison period) from when the comparison unit 26 starts the comparison operation to when the comparison unit 26 is reset longer than the worst value of the response time of the comparison unit 26.
- the generation timing of the comparison control signal is controlled. Therefore, even when the difference between the comparison signal and the input signal is very small, the timing generation unit 22 can surely reset the comparison unit 26 after the comparison unit 26 outputs the comparison result.
- the completion detection unit 30 detects that the comparison unit 26 has output the comparison result, and outputs a completion signal prior to reset (time t25).
- the bit selection unit 16 selects a new bit to be converted in response to the completion signal being output (time t27). Thereafter, the AD conversion apparatus 10 repeats the same processing from time t22 to time t27.
- the comparison signal output from the DA converter 20 changes every time a new bit to be converted is selected. Since the value of the change amount of the comparison signal is determined by the binary search, it becomes smaller as the conversion target bit transitions to the lower bit. That is, the amount of change in the comparison signal is larger when the conversion target bit is a higher-order bit.
- the settling time of the DA converter 20 becomes longer as the change of the comparison signal is larger. Therefore, the settling time of the DA converter 20 is longer when the bit to be converted is the higher bit.
- the changing unit 24 changes the timing of the comparison control signal output by the timing generating unit 22 so that the comparison start timing is delayed when the conversion target bit is a higher-order bit. That is, the changing unit 24 sets the waiting time Ts from when the comparison data is supplied to the DA conversion unit 20 until the comparison unit 26 starts the comparison operation when the conversion target bit is a lower bit than when the conversion target bit is a lower bit. Control so that is longer. Thereby, the change unit 24 causes the comparison unit 26 to start the comparison operation after the comparison signal is set regardless of the bit position of the conversion target bit, and after the comparison signal is set, Redundancy time until 26 starts the comparison can be shortened.
- the AD conversion apparatus 10 can start the comparison operation of the comparison unit 26 at an appropriate timing. Therefore, according to such an AD converter 10, the conversion period can be further shortened.
- FIG. 6 shows an example of comparison data generation processing by the data control unit 18.
- the input signal range of the AD converter 10 is 0 or more and Vref or less.
- the data control unit 18 outputs comparison data for determining the value of the selected conversion target bit every time the conversion target bit is selected by the bit selection unit 16. More specifically, the data control unit 18 sets the output data in which the bit higher than the selected conversion target bit is a value determined based on the comparison result and the conversion target bit is 0, and the higher order than the conversion target bit.
- the comparison data representing the boundary with the output data in which the bit is a value determined based on the comparison result and the conversion target bit is 1 is output.
- the data control unit 18 causes the output unit 32 to determine whether the value of the conversion target bit is 0 or 1 based on the comparison result obtained by comparing the magnitudes of the comparison signal and the input signal. Can do.
- the data control unit 18 may output comparison data representing the center level (Vref / 2) of the input signal range. For example, the data control unit 18 may output comparison data in which the conversion target bit (most significant bit) is set to 1 and the other bits are set to 0.
- the data control unit 18 may output comparison data representing the center level of the comparison range narrowed down by the binary search. For example, the data control unit 18 sets each bit higher than the conversion target bit to a value determined according to the comparison result, sets the conversion target bit to 1, and sets the lower bit than the conversion target bit to 0. Comparison data may be output.
- FIG. 7 shows an example of the configuration of the comparison unit 26 according to the present embodiment.
- the comparison unit 26 includes a differential amplifier 102, a positive side buffer 104, a negative side buffer 106, and a latch core 108.
- the differential amplifier 102 receives two signals (an input signal V IN and a comparison signal V R ) to be compared.
- Differential amplifier 102 a positive difference signal V P obtained by amplifying the difference between the input signal V IN and the comparison signal V R, and outputs the positive output terminal.
- the differential amplifier 102, to the positive side difference signal V P, a negative difference signal V N level positive and negative are inverted around the common potential is output from the negative output terminal.
- the positive buffer 104 receives the positive difference signal V P and converts the positive difference signal V P into a positive result signal representing a logic level.
- the positive buffer 104 includes an nMOSFET 142 in the positive buffer.
- the positive side difference signal V P output from the positive side output terminal of the differential amplifier 102 is applied to the gate of the nMOSFET 142 in the positive side buffer.
- Negative buffer 106 receives a negative-side differential signal V N, for converting the negative difference signal V N to the negative result signal representative of a logic level inverted with respect to the positive result signal.
- the negative side buffer 106 includes a negative side buffer internal nMOSFET 144. The gate of the negative side in the buffer NMOSFET144, negative difference signal V N outputted from the negative output terminal of the differential amplifier 102 is given.
- the latch core 108 holds the logic level of the positive result signal and the logic level of the negative result signal during the comparison period. In addition, the latch core 108 resets both the logic level of the positive result signal and the logic level of the negative result signal held therein to a logic level representing a predetermined logic value during the reset period.
- the latch core 108 includes a reset nMOSFET 140, a positive nMOSFET 146, a positive pMOSFET 148, a negative nMOSFET 150, a negative pMOSFET 152, a positive reset pMOSFET 154, and a negative reset pMOSFET 156.
- the reset nMOSFET 140 receives a comparison control signal at its gate.
- the source of the reset nMOSFET 140 is connected to the ground potential (L logic level).
- the drain of the reset nMOSFET 140 is connected to the source of the nMOSFET 142 in the positive buffer and the source of the nMOSFET 144 in the negative buffer.
- Such a reset nMOSFET 140 is turned on when the comparison control signal is H logic (comparison period) and turned off when the comparison logic signal is L logic (reset period).
- the gate of the positive nMOSFET 146 and the gate of the positive pMOSFET 148 are connected in common.
- the drain of the positive nMOSFET 146 and the drain of the positive pMOSFET 148 are connected in common.
- the source of the positive nMOSFET 146 is connected to the drain of the negative buffer nMOSFET 144.
- the source of the positive side pMOSFET 148 is connected to the power supply potential (H logic level). Since such positive side nMOSFET 146 and positive side pMOSFET 148 have their gates and drains connected in common, they operate so that when one is on, the other is off.
- the gate of the negative nMOSFET 150 and the gate of the negative pMOSFET 152 are connected in common.
- the drain of the negative side nMOSFET 150 and the drain of the negative side pMOSFET 152 are connected in common.
- the source of the negative nMOSFET 150 is connected to the drain of the positive buffer nMOSFET 142.
- the source of the negative pMOSFET 152 is connected to the power supply potential (H logic level). Since the negative side nMOSFET 150 and the negative side pMOSFET 152 have their gates and drains connected in common, when one is off, the other is turned on.
- drains of the positive nMOSFET 146 and the positive pMOSFET 148 are connected to the positive output terminal 160.
- drains of the negative side nMOSFET 150 and the negative side pMOSFET 152 are connected to the negative side output terminal 162.
- the gates of the positive nMOSFET 146 and the positive pMOSFET 148 are connected to the drains of the negative nMOSFET 150 and the negative pMOSFET 152.
- the gates of the negative nMOSFET 150 and the negative pMOSFET 152 are connected to the drains of the positive nMOSFET 146 and the positive pMOSFET 148.
- the positive side reset pMOSFET 154 is supplied with a comparison control signal at its gate.
- the drain of the positive side reset pMOSFET 154 is connected to the positive side output terminal 160.
- the source of the positive side reset pMOSFET 154 is connected to the power supply potential (H logic level).
- Such a positive side reset pMOSFET 154 is turned off when the comparison control signal is logic H (comparison period) and turned on when logic L (reset period).
- the negative reset pMOSFET 156 is supplied with a comparison control signal at its gate.
- the drain of the negative side reset pMOSFET 156 is connected to the negative side output terminal 162.
- the source of the negative side reset pMOSFET 156 is connected to the power supply potential (H logic level).
- the negative-side reset pMOSFET 156 is turned off when the comparison control signal is H logic (comparison period) and turned on when L logic (reset period).
- the comparison unit 26 having such a configuration, in the reset period, the reset nMOSFET 140 is turned off, and the positive side reset pMOSFET 154 and the negative side reset pMOSFET 156 are turned on. Thereby, the comparison unit 26 can output a predetermined logic level (H logic level) from the positive output terminal 160 and the negative output terminal 162 in the reset period.
- H logic level a predetermined logic level
- the reset nMOSFET 140 is turned on and the positive side reset pMOSFET 154 and the negative side reset pMOSFET 156 are turned off during the comparison period.
- the positive side difference signal V P is greater than the negative difference signal V N
- the negative difference signal V N low drain potential of the positive buffer NMOSFET142
- the negative nMOSFET 150 is turned on
- the negative pMOSFET 152 is turned off.
- the positive output terminal 160 is at the H logic level
- the negative output terminal 162 is at the L logic level.
- the positive side difference if the signal V P is smaller than the negative difference signal V N the higher the potential of the drain of the positive side in the buffer NMOSFET142, low potential of the drain of the negative side in the buffer nMOSFET144 .
- the positive nMOSFET 146 is turned on, the positive pMOSFET 148 is turned off, the negative nMOSFET 150 is turned off, and the negative pMOSFET 152 is turned on.
- the positive output terminal 160 is at the L logic level
- the negative output terminal 162 is at the H logic level.
- the comparison unit 26 can output a positive result signal and a negative result signal that represent the comparison result as a differential logic value in the comparison period. Further, the comparison unit 26 can output a positive result signal and a negative result signal representing a logic value (for example, H logic) fixed to one value in the reset period.
- a logic value for example, H logic
- FIG. 8 shows an example of the configuration of the completion detection unit 30 according to the present embodiment.
- the completion detection unit 30 may include an EXOR circuit 60 as an example.
- the EXOR circuit 60 becomes the first logic (for example, H logic) when the logical value of the positive result signal and the logical value of the negative result signal do not match, and the second logic (for example, L logic) when they match. ) Is output.
- the completion detection unit 30 can output a completion signal at the timing when the logical value of the positive result signal and the logical value of the negative result signal do not match.
- the completion detection unit 30 replaces the EXOR circuit 60 with a differential amplifier that outputs an amplified signal obtained by amplifying the difference between the positive result signal and the negative result signal, and an absolute value of the amplified signal is determined in advance. And a comparator that outputs a completion signal at a timing that is greater than the value. Even with such a configuration, the EXOR circuit 60 can output a completion signal prior to the reset of the comparison unit 26.
- FIG. 9 illustrates an example of the positive side result signal and the negative side result signal output from the comparison unit 26 having the configuration illustrated in FIG. 7, and an example of the completion signal output from the completion detection unit 30 illustrated in FIG. Show.
- the differential amplifier 102 in the comparison unit 26 differentially amplifies the difference between the input signal and the comparison signal (time t101 to t102).
- the positive side buffer 104 and the negative side buffer 106 in the comparison unit 26 set the positive side result signal to the H logic (or L logic) and the negative side result signal to the negative side result signal.
- the logic is opposite to that of the positive result signal.
- the latch core 108 holds the logic of the positive result signal and the negative result signal until a reset instruction is given (time t102 to t103).
- the EXOR circuit 60 in the completion detection unit 30 changes the completion signal from L logic to H logic at the timing when the logic of the positive result signal and the logic of the negative result signal do not match (time t102). . In this way, the completion detection unit 30 can output a completion signal prior to resetting the comparison unit 26.
- FIG. 10 shows a configuration of the AD conversion apparatus 10 according to a first modification of the present embodiment.
- the AD conversion apparatus 10 according to the present modification employs substantially the same configuration and function as the AD conversion apparatus 10 according to the present embodiment illustrated in FIG. 1, and thus is substantially the same as the members included in the AD conversion apparatus 10 according to the present embodiment.
- the members having the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for the differences.
- the AD conversion apparatus 10 further includes a memory 40.
- the memory 40 stores a delay amount for each bit position of output data.
- the AD conversion apparatus 10 according to the present modification reads the delay amount corresponding to the position of the conversion target bit selected by the bit selection unit 16 from the memory 40 and delays the comparison control signal according to the read delay amount. To do.
- FIG. 11 shows an example of the delay amount stored in the memory 40 according to the first modification of the present embodiment.
- the memory 40 stores a delay amount in association with each bit position (for example, each of the Nth to first bits) of the output data.
- the memory 40 may store a delay amount in which the upper bits are larger.
- the AD conversion apparatus 10 according to this modification can cause the comparison unit 26 to start the comparison operation at an appropriate timing according to the position of the conversion target bit.
- FIG. 12 shows a configuration of the AD conversion apparatus 10 according to the second modification of the present embodiment. Since the AD conversion apparatus 10 according to the present modification employs substantially the same configuration and function as the AD conversion apparatus 10 according to the first modification illustrated in FIG. 10, members included in the AD conversion apparatus 10 according to the first modification. The members having substantially the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for differences.
- the AD conversion apparatus 10 further includes a measurement signal generation unit 42 and a settling measurement unit 44.
- the measurement signal generator 42 gives measurement data to the DA converter 20 instead of the comparison data output by the data controller 18 during calibration, and outputs a comparison signal corresponding to the measurement data from the DA converter 20.
- the measurement signal generator 42 gives a predetermined analog measurement signal to the DA converter 20 instead of the input signal at the time of calibration.
- the measurement signal generator 42 gives a sample signal to the S / H circuit 14 instead of the sequence controller 34 at the time of calibration.
- the settling measurement unit 44 measures the time from when the measurement data is given to the DA conversion unit 20 until the comparison signal corresponding to the measurement data is set during calibration. Further, the settling measurement unit 44 gives a comparison control signal to the comparison unit 26 instead of the changing unit 24 at the time of calibration. Then, the setling measurement unit 44 calculates a delay amount for each bit position of the output data based on the measured time and writes it in the memory 40.
- FIG. 13 shows an example of a processing flow during calibration of the AD conversion apparatus 10 according to the second modification.
- the measurement signal generator 42 causes the S / H circuit 14 to sample an analog measurement signal (S41). Subsequently, the measurement signal generator 42 causes the S / H circuit 14 to hold the sampled measurement signal (S42).
- the measurement signal generator 42 performs the processing from step S44 to step S54 for each bit (measurement target bit) for which calibration is to be performed (S43, S55).
- the measurement signal generator 42 repeatedly executes the processing from step S45 to step S50 while sequentially changing the set time (S44, S51).
- the set time represents the time from when the measurement data is given to the DA conversion unit 20 until the comparison unit 26 starts the comparison operation.
- the measurement signal generator 42 gives the first measurement data to the DA converter 20 (S45). Subsequently, the measurement signal generator 42 waits for processing for a predetermined time (a time sufficient for the comparison signal output from the DA converter 20 to be set) (S46). Subsequently, the measurement signal generator 42 gives the second measurement data to the DA converter 20 (S47).
- the first measurement data, the second measurement data and the measurement signal are the first comparison signal obtained by DA-converting the first measurement data and the second measurement data obtained by DA-converting the second measurement data. It has a relationship with the comparison signal.
- the comparison unit 26 starts the comparison operation earlier than the predetermined timing. And the comparison result when the comparison unit 26 starts the comparison operation later than the predetermined timing can be reversed.
- the first measurement data and the second measurement data may have a relationship in which the values of the measurement target bits are inverted from each other and the values other than the measurement target bits are the same.
- the measurement signal generator 42 gives the second measurement data after giving the first measurement data to the DA converter 20
- the measurement signal generator 42 uses the comparison signal output from the DA converter 20 as the measurement target.
- the level can be changed according to the bit weight.
- the second measurement data may be a value close to the measurement signal.
- the comparison unit 26 makes the comparison earlier than the timing when the comparison signal is set. The comparison result when the operation is started and the comparison result when the comparison unit 26 starts the comparison operation after the timing when the comparison signal is set can be reversed.
- the settling measurement unit 44 waits for processing for the set time set in S44 after the second measurement data is given to the DA conversion unit 20 (S48).
- the settling measurement unit 44 causes the comparison unit 26 to start a comparison operation at a timing when the set time has elapsed since the second measurement data was supplied to the DA conversion unit 20 (S49).
- the set ring measurement unit 44 acquires a comparison result by the comparison unit 26 (S50).
- the measurement signal generating unit 42 sequentially changes the set time (for example, sequentially increases or decreases the set time), and the comparison result is inverted from the previous comparison result (the comparison result changes). )
- the set time is detected (S44, S51).
- the measurement signal generating unit 42 detects a set time in which the comparison result is inverted from the immediately preceding comparison result, the measurement signal generating unit 42 ends the iterative process from step S45 to step S50, and shifts the process to step S52 (S51).
- the settling measurement unit 44 calculates the settling time of the comparison signal output from the DA conversion unit 20 based on the set time when the comparison result is inverted (S52). As an example, the settling measurement unit 44 calculates the difference between the measurement signal and the first comparison signal according to the first measurement data, and the second comparison signal according to the measurement signal and the second measurement data. The settling time may be calculated from the difference ratio and the set time when the comparison result is inverted.
- the settling measurement unit 44 calculates a delay amount when the bit is selected as a conversion target bit based on the calculated settling time (S53).
- the settling measurement unit 44 writes the calculated delay amount in the memory 40 (S54).
- the settling measurement unit 44 ends the calibration when the processing from step S45 to step S54 is completed for all the measurement target bits.
- the AD conversion apparatus 10 can calculate the delay amount for each bit position of the output data and write it in the memory 40.
- FIG. 14 shows a configuration of the AD conversion apparatus 10 according to a third modification of the present embodiment.
- the AD conversion apparatus 10 according to the present modification employs substantially the same configuration and function as the AD conversion apparatus 10 according to the present embodiment illustrated in FIG. 1, and thus is substantially the same as the members included in the AD conversion apparatus 10 according to the present embodiment.
- the members having the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for the differences.
- the changing unit 24 includes a plurality of delay units 54 and a delay selection unit 56.
- Each of the plurality of delay units 54 is associated with any bit of the output data.
- Each of the plurality of delay units 54 delays the comparison control signal by a delay amount corresponding to the associated bit.
- the delay selection unit 56 selects the comparison control signal output from the delay unit 54 corresponding to the bit position of the conversion target bit and provides the comparison control signal to the comparison unit 26.
- the AD conversion apparatus 10 can cause the comparison unit 26 to start the comparison operation at an appropriate timing according to the position of the conversion target bit.
- FIG. 15 shows a configuration of the AD conversion apparatus 10 according to a fourth modification of the present embodiment.
- the AD conversion apparatus 10 according to the present modification employs substantially the same configuration and function as the AD conversion apparatus 10 according to the present embodiment illustrated in FIG. 1, and thus is substantially the same as the members included in the AD conversion apparatus 10 according to the present embodiment.
- the members having the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for the differences.
- the AD conversion apparatus 10 according to this modification may be configured without the holding unit 28.
- the data control unit 18 and the output unit 32 start from the timing when the comparison unit 26 outputs the comparison result (for example, the timing when the completion detection unit 30 outputs the completion signal) until the comparison unit 26 is reset.
- the comparison result output from the comparison unit 26 is captured.
- the AD converter 10 according to this modification can be simplified in configuration.
- FIG. 16 shows a configuration of the AD conversion apparatus 10 according to a fifth modification of the present embodiment.
- the AD conversion apparatus 10 according to the present modification employs substantially the same configuration and function as the AD conversion apparatus 10 according to the present embodiment illustrated in FIG. 1, and thus is substantially the same as the members included in the AD conversion apparatus 10 according to the present embodiment.
- the members having the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for the differences.
- the AD conversion apparatus 10 further includes a reset adjustment unit 62.
- the reset adjustment unit 62 determines the next bit to be converted in accordance with the response time from the timing when the comparison unit 26 starts comparison until the timing when the comparison unit 26 outputs a comparison result comparing the input signal and the comparison signal.
- the reset timing indicated by the comparison control signal is changed. Since the AD conversion apparatus 10 according to the present modification can change the comparison period from the start timing of the comparison operation of the comparison unit 26 to the reset timing, the power consumed by the comparison unit 26 can be controlled. .
- FIG. 17 shows an example of a timing chart of signals in the AD conversion apparatus 10 according to the fifth modification shown in FIG.
- the response time from when the comparison unit 26 receives a comparison start instruction to when the comparison result is output becomes longer as the difference between the comparison signal supplied to the comparison unit 26 and the input signal is smaller. Therefore, the timing generation unit 22 compares the period from when the comparison unit 26 starts the comparison operation until it is reset (comparison period) in comparison with the worst value of the response time of the comparison unit 26. Control the control signal. Thereby, the timing generation unit 22 can prevent the comparison unit 26 from being reset before the comparison unit 26 outputs the comparison result.
- the comparison signal output from the DA converter 20 changes according to the binary search. That is, each time the bit to be converted transitions to the lower level bit by bit, the comparison signal is 1/4 level, 1/8 level, 1/16 level, 1/32 level, 1/32 level of the input signal range from the previous level. 64 levels ... change. Therefore, when the difference between the input signal and the comparison signal is very small in one bit in the process of transitioning the conversion target bit to the lower bit by bit, the input signal and the comparison signal in the bit next to the one bit Is substantially the same as the fluctuation amount of the comparison signal. That is, when the difference between the input signal and the comparison signal is very small in a certain bit, the difference between the input signal and the comparison signal in the bit next to the one bit is relatively large.
- the reset adjustment unit 62 compares the input signal with the comparison signal from the timing when the comparison unit 26 starts comparison. If the response time T R until the output timing is longer and may be more quickly timing of the reset indicated by the comparison control signal for the next conversion target bit. Thereby, the reset adjustment unit 62 shortens the comparison period of the comparison unit 26 (that is, the period from the start of the comparison operation to the reset), thereby reducing the power consumed by the comparison unit 26. it can.
- the reset adjustment unit 62 When performing a binary search, the amount of change in the comparison signal output from the DA converter 20 is smaller for the lower bits of the conversion target bits. Therefore, even when the response time of the comparison unit 26 is long, the reset adjustment unit 62 cannot greatly advance the reset timing when the conversion target bit is a relatively low-order bit. Therefore, as an example, the reset adjustment unit 62 indicates the comparison target signal for the next bit to be converted when the response time is longer on condition that the bit to be converted is higher than a predetermined bit position. The reset timing may be made earlier. Thereby, the reset adjustment unit 62 can efficiently reduce the power consumed by the comparison unit 26.
- FIG. 18 shows the configuration of the DA conversion unit 20 according to the sixth modification of the present embodiment, together with the comparison unit 26.
- the AD conversion apparatus 10 according to the present modification employs substantially the same configuration and function as the AD conversion apparatus 10 according to the present embodiment illustrated in FIG. 1, and thus is substantially the same as the members included in the AD conversion apparatus 10 according to the present embodiment.
- the members having the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for the differences.
- the DA conversion unit 20 may be a charge redistribution type DA converter including the function of the S / H circuit 14 (see, for example, US Patent Publication No. 2007/0132626).
- the charge redistribution DA converter 20 samples the voltage (input voltage) VIN of the input signal at the time of sampling. Further, the DA converter 20 holds the sampled input voltage VIN at the time of holding. Furthermore, DA converter 20, during holding, the voltage corresponding to the comparison data D R given (comparison voltage) V R, the voltage obtained by subtracting the input voltage V IN that sample (V R -V IN), Output from the output terminal.
- the comparison unit 26 compares the output voltage output from the output terminal of the DA conversion unit 20 with the common potential, and outputs the comparison result.
- comparing unit 26 may output a comparison result obtained by comparing the comparison voltage V R and the input voltage V IN.
- the AD conversion apparatus 10 according to this modification can perform AD conversion with relatively little power.
- the AD conversion apparatus 10 according to this modification may be configured to further include the S / H circuit 14 in the previous stage of the DA conversion unit 20.
- FIG. 19 shows the configuration of the DA conversion unit 20 according to the seventh modification of the present embodiment together with the comparison unit 26.
- the AD conversion apparatus 10 according to the present modification has substantially the same configuration and function as the AD conversion apparatus 10 according to the present embodiment illustrated in FIG.
- the members having the same configuration and function are denoted by the same reference numerals, and description thereof will be omitted except for the differences.
- the AD conversion apparatus 10 outputs digital output data corresponding to the differential analog input voltage (V IN ⁇ p , V IN ⁇ n ).
- the DA converter 20 according to this modification includes a positive DA converter 96-p and a negative DA converter 96-n.
- the positive-side DA converter 96-p is a charge redistribution type, and samples the positive-side input voltage V IN-p at the time of sampling and samples the positive-side input voltage V IN-p at the time of holding. Hold. Further, the positive side DA converter 96-p is supplied with the positive side reference voltage + V REF as a reference voltage at the time of holding. Then, DA converter 96-p on the positive side, at the time of the hold, given the comparison data D R, the result, the input voltage V IN-p the positive, the comparison of the positive side in response to the comparison data D R It outputs a voltage obtained by subtracting the voltage V R-p (V IN- p -V R-p).
- the negative-side DA converter 96-n is a charge redistribution type, and samples the negative-side input voltage V IN-n at the time of sampling and samples the negative-side input voltage V IN-n at the time of holding. Hold. Further, the negative DA converter 96-n is supplied with a negative reference voltage ⁇ V REF in which positive and negative are inverted with respect to the positive reference voltage + V REF as a reference voltage at the time of holding.
- DA converter 96-n of the negative side during holding, given the comparison data D R, the comparison of this result, the input voltage V IN-n a negative side, the negative side in accordance with the comparison data D R It outputs a voltage obtained by subtracting the voltage V R-n (V IN- n -V R-n).
- the comparison unit 26 compares the difference voltage between the positive input voltage V IN-p and the negative input voltage V IN-n , the positive comparison voltage V R ⁇ p, and the negative A comparison result comparing the difference voltage with the comparison voltage V R ⁇ n is output.
- Such a comparison unit 26 can output a comparison result obtained by comparing the comparison voltage V R of the input voltage V IN and the differential of the differential.
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Abstract
Description
出願番号 12/176,422 出願日 2008年7月21日
Claims (11)
- アナログの入力信号に応じたデジタルの出力データを出力する逐次比較型のAD変換装置であって、
変換対象ビットを前記出力データの上位側から順次に選択するビット選択部と、
前記変換対象ビットが選択される毎に、前記変換対象ビットの値を判別するための比較データを出力するデータ制御部と、
前記比較データに応じたアナログの比較信号を出力するDA変換部と、
前記比較データを前記DA変換部に与えてから所定時間遅延したタイミングにおいて、比較開始を指示する比較制御信号を出力するタイミング発生部と、
前記変換対象ビットがより上位ビットの場合に前記比較制御信号に示された比較開始のタイミングがより遅くなるように、前記変換対象ビットのビット位置に応じて前記比較制御信号のタイミングを変更する変更部と、
前記変更部によりタイミングが変更された前記比較制御信号に示された比較開始のタイミングにおいて、前記入力信号と前記比較信号との比較を開始する比較部と、
前記比較部が比較結果を出力した後に、前記ビット選択部に次の前記変換対象ビットを選択させる完了信号を出力する完了検出部と、
各ビットの値が前記比較部による比較結果に基づき決定される出力データを出力する出力部と、
を備えるAD変換装置。 - 前記データ制御部は、前記変換対象ビットより上位のビットが前記比較結果に基づき決定された値であり且つ前記変換対象ビットが0となる出力データと、前記変換対象ビットより上位のビットが前記比較結果に基づき決定された値であり且つ前記変換対象ビットが1となる出力データとの境界を表す前記比較データを出力する
請求項1に記載のAD変換装置。 - 前記タイミング発生部は、比較開始を指示してから所定時間遅延したタイミングにおいて、リセットを指示する前記比較制御信号を出力し、
前記比較部は、前記比較制御信号に示されたリセットのタイミングにおいて、比較結果がリセットされる
請求項1から2の何れかに記載のAD変換装置。 - 前記タイミング発生部は、先行エッジが前記比較開始を示し、末尾エッジが前記リセットを示すパルス状の前記比較制御信号を発生し、
前記変更部は、前記変換対象ビットの位置に応じた遅延量で前記比較制御信号を遅延し、
前記比較部は、前記比較制御信号の先行エッジのタイミングにおいて比較動作を開始し、前記比較制御信号の末尾エッジのタイミングにおいてリセット動作を開始する
請求項3に記載のAD変換装置。 - 前記出力データのビット位置毎に遅延量を記憶したメモリを更に備え、
前記変更部は、前記変換対象ビットの位置に対応する前記遅延量を前記メモリから読み出して、読み出した前記遅延量に応じて前記比較制御信号を遅延する
請求項4に記載のAD変換装置。 - 前記比較データに代えて測定データを前記DA変換部に与えて、前記測定データに応じた比較信号を前記DA変換部から出力させる測定信号発生部と、
前記測定データが前記DA変換部に与えられてから、前記測定データに応じた比較信号がセットリングするまでの時間を測定し、測定した時間に基づき前記出力データのビット位置毎の遅延量を算出して前記メモリに書き込むセットリング測定部と
を更に備える
請求項5に記載のAD変換装置。 - 前記変更部は、
前記出力データのいずれかのビットに対応付けられ、前記比較制御信号を対応付けられたビットに応じた遅延量で遅延する複数の遅延部と、
前記変換対象ビットのビット位置に対応する遅延部が出力した前記比較制御信号を選択して前記比較部に与える遅延選択部と
請求項4に記載のAD変換装置。 - 前記比較部が比較を開始したタイミングから、前記比較部が前記入力信号と前記比較信号とを比較した比較結果を出力するタイミングまでの応答時間に応じて、次の前記変換対象ビットについての前記比較制御信号により示される前記リセットのタイミングを変更するリセット調整部を更に備える
請求項3から7の何れかに記載のAD変換装置。 - 前記リセット調整部は、前記応答時間がより長い場合に、次の前記変換対象ビットについての前記比較制御信号により示される前記リセットのタイミングをより早くする
請求項8に記載のAD変換装置。 - 前記リセット調整部は、前記変換対象ビットが予め定められたビット位置より上位であることを条件として、前記応答時間がより長い場合に、次の前記変換対象ビットについての前記比較制御信号により示される前記リセットのタイミングをより早くする
請求項9に記載のAD変換装置。 - 前記DA変換部は、容量アレイ型のDA変換器である
請求項1から10の何れかに記載のAD変換装置。
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Cited By (11)
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JP2012039475A (ja) * | 2010-08-09 | 2012-02-23 | Fujitsu Ltd | 逐次比較型ad変換器及び逐次比較型ad変換器の動作クロック調整方法 |
JP2014514855A (ja) * | 2011-04-13 | 2014-06-19 | アナログ ディヴァイスィズ インク | 自己タイミング型デジタル/アナログ変換器 |
JP2014075684A (ja) * | 2012-10-04 | 2014-04-24 | Fujitsu Semiconductor Ltd | Ad変換回路、半導体装置及びad変換方法 |
WO2014061117A1 (ja) * | 2012-10-17 | 2014-04-24 | ルネサスエレクトロニクス株式会社 | Ad変換器 |
US9258009B2 (en) | 2012-10-17 | 2016-02-09 | Renesas Electronics Corporation | AD converter |
JP5917710B2 (ja) * | 2012-10-17 | 2016-05-18 | ルネサスエレクトロニクス株式会社 | Ad変換器 |
JP2015056890A (ja) * | 2013-09-12 | 2015-03-23 | 富士通セミコンダクター株式会社 | 混合信号回路 |
JP2019047339A (ja) * | 2017-09-01 | 2019-03-22 | 株式会社日立製作所 | 逐次比較型アナログデジタル変換器 |
WO2022085324A1 (ja) * | 2020-10-23 | 2022-04-28 | ソニーセミコンダクタソリューションズ株式会社 | 逐次比較型アナログ/デジタル変換器 |
WO2022102035A1 (ja) * | 2020-11-12 | 2022-05-19 | サンケン電気株式会社 | アナログデジタル変換回路 |
US11757460B2 (en) | 2020-11-12 | 2023-09-12 | Sanken Electric Co., Ltd. | Analog-to-digital converter |
Also Published As
Publication number | Publication date |
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JPWO2010010661A1 (ja) | 2012-01-05 |
US7705763B2 (en) | 2010-04-27 |
US20100013693A1 (en) | 2010-01-21 |
JP5277248B2 (ja) | 2013-08-28 |
CN102106087A (zh) | 2011-06-22 |
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