WO2007111035A1 - データ受信装置及び該データ受信装置を備える半導体集積回路 - Google Patents
データ受信装置及び該データ受信装置を備える半導体集積回路 Download PDFInfo
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- WO2007111035A1 WO2007111035A1 PCT/JP2007/050900 JP2007050900W WO2007111035A1 WO 2007111035 A1 WO2007111035 A1 WO 2007111035A1 JP 2007050900 W JP2007050900 W JP 2007050900W WO 2007111035 A1 WO2007111035 A1 WO 2007111035A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
- H04L25/4923—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using ternary codes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
- H03F3/45183—Long tailed pairs
- H03F3/45188—Non-folded cascode stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
- H03F3/45744—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by offset reduction
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45212—Indexing scheme relating to differential amplifiers the differential amplifier being designed to have a reduced offset
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45354—Indexing scheme relating to differential amplifiers the AAC comprising offset means
Definitions
- the present invention relates to a data receiving device and a semiconductor integrated circuit including the data receiving device.
- the present invention relates to a data receiving device and a semiconductor integrated circuit including the data receiving device, and is provided in, for example, a transmission device that transmits and receives an electric signal via a cable or an electric wiring on a board.
- the present invention relates to a data receiving apparatus suitable for use in receiving duobinary transmitted data and a semiconductor integrated circuit including the data receiving apparatus.
- duo-binary transmission has been carried out in order to suppress signal amplitude degradation due to signal attenuation and signal timing degradation due to increased intersymbol interference.
- duo-binary transmission by allowing interference between adjacent bits, the amount of signal attenuation is suppressed, and timing degradation due to intersymbol interference is also suppressed.
- FIG. 1 is a waveform diagram of received data subjected to duo-binary transmission.
- the current received data changes depending on the data transmitted from the transmission side, particularly the data transmitted immediately before. For example, the last sent If the data is “0”, the received data is “0” if the currently transmitted data is “0”, and the received data is "1” if the currently transmitted data is 1 On the other hand, if the data sent immediately before is “1”, it is currently sent! If the data to be sent is “0”, the received data is “1”, and the data power currently being sent is If it is “1”, the received data will be “2”.
- the data received by the data receiver is from “0" (low level), "1" (intermediate level), and "2" (high level).
- the data receiving device must discriminate between these ternary data.
- the ternary data “0”, “1”, and “2” is determined at the first eye opening and the second eye opening. “0” and “1” are determined in the first eye opening, and “1” and “2” are determined in the second eye opening.
- a low-voltage reference voltage Vref- is used in the first eye opening
- a high-voltage reference voltage Vref + is used in the second eye opening to determine the ternary signal of duo 'binary data. Is done.
- FIG. 2 is a block diagram showing an electrical configuration of a data receiving apparatus that receives duo'binary transmitted data.
- This data receiving apparatus includes sampling latches 1 and 2 with multilevel determination, offset cancel control circuits 3 and 4, and a decoder 5.
- Sampling latches 1 and 2 with multi-level determination are based on reference voltages Vref + and Vref-, and are used to determine the level of duo and binary data dat transmitted from a transmitter not shown in synchronization with the clock signal CLK. .
- the sampling latch 1 with multi-level determination determines the data of the second eye opening in FIG. 1 and outputs a determination signal a
- the sampling latch 2 with multi-level determination has the first eye opening Judge the data and output decision signal b.
- the offset cancel control circuit 3 sends offset cancel control signals cl and c2 to the sampling latch 1 with multi-value determination.
- the offset cancel control circuit 4 sends the offset cancel control signals dl and d2 to the sampling latch 2 with multi-value judgment.
- the decoder 5 restores transmission data originally transmitted by decoding the determination signals a and b.
- FIG. 3 is a circuit diagram showing an electrical configuration of sampling latch 1 with multi-value determination in FIG. [0010]
- the sampling latch 1 with multivalued judgment is a p-channel MOSFET (hereinafter referred to as “pMOS”! /,) 11, 12, 13, 14, 15, 16, 17, ⁇ channel type MOSFET (hereinafter referred to as “nMOS”! /, U) 18, 19, 20, 21, 22, 23, 24 and offset canceller 25, 26.
- pMOS p-channel MOSFET
- nMOS ⁇ channel type MOSFET
- sampling latch 1 In sampling latch 1 with multi-level determination, input data DIN and DINB, which are differential data, are input as duo'binary data dat, and reference voltages Vref + and Vref- and input data DIN when clock signal CLK is input Based on the voltage comparison result with DINB, the eye opening of the duo-binary data dat is determined, and the received data is determined.
- the sampling latch 2 with multi-value determination has the same configuration, but the reference voltage Vref + is applied to the gate of the nMOS 22 and is applied to the gate of the reference voltage Vref ⁇ power MOSMOS 23.
- the drain currents of the nMOSs 20 and 21 are controlled using the offset cancellations 25 and 26. That is, the offset cancel 25 controls the drain current of the nMOS 20 by the offset cancel control signal cl from the offset cancel cell control circuit 3, and the offset cancel 26 controls the drain current of the nMOS 21 by the offset cancel control signal c2. As a result, the offset caused by the variation in the threshold voltages of the nMOSs 20 and 21 is cancelled.
- the sample with multi-valued judgment in Figure 2 The latch 2 has the same configuration as the sampling latch 1 with multi-value determination.
- the offset cancel 25 in the sampling latch 2 with multi-valued judgment controls the drain current of the nMOS 20 by the offset cancel control signal dl of 4 offset cancel control circuits.
- the offset cancel 26 in the sampling latch 2 with multi-level determination controls the drain current of the nMOS 21 by the offset cancel control signal d2 from the offset cancel control circuit 4. For this reason, the offset caused by the variation in the threshold voltage of the nMOSs 20 and 21 of the sampling latch 2 with multi-value determination is canceled.
- FIG. 4 is a time chart for explaining the operation of the data receiving apparatus shown in FIG.
- the first eye opening is indicated by Bl, B2,...
- the second eye opening is indicated by Al, A2,.
- This data receiving apparatus requires a clock signal having the same frequency as the transmission data rate. For example, if the transmission data rate is lOGbZs, 10 GHz is required as the clock signal CLK. Then, at the rising timing of the clock signal CLK, the first and second eye openings are determined by the two sampling latches 1 and 2 with multi-value determination, and determination signals a and b are output. The determination signals a and b are decoded by the decoder 5 to restore the transmission data.
- FIG. 5 is a block diagram showing the electrical configuration of the parallel data receiving apparatus. Elements common to those in FIG. 2 are denoted by common reference numerals.
- sampling latches with multi-value determination 31, 32, offset cancel control circuits 33, 34, inverter 35, flip-flops 36, 37 , 38, 39, and a decoder 5A is provided instead of the decoder 5 in FIG.
- FIG. 6 is a time chart for explaining the operation of the data receiving apparatus shown in FIG.
- the sampling latches 1 and 2 with multi-value determination determine the duo and binary data dat at the rising edge of the clock signal CLK.
- the sampling latches 31 and 32 with multi-value determination determine the duo binary data dat at the rising timing of the clock signal CLKB, and output the determination signals a, b, e, and f.
- Judgment signals a, b, e, fi and flip-flops 36, 38, 37, 39 [clock signal CK] are sent to decoder 5A synchronously, and the transmission data is restored by decoder 5A.
- the offset cancel function is necessary for each sampling latch with multi-value determination, and the number of sampling latches with multi-value determination increases according to the parallelization of the circuits in the data receiving apparatus. As the number increases, the number of offset cancellation control circuits also increases. Furthermore, if parallelization is promoted by using a clock signal as a 4-phase clock or 8-phase clock, the operating speed of the data receiver will be further reduced, and high-speed operation will be possible. However, parallelization increases the number of sampling latches with multi-valued determination, that is, the number of differential pair transistors to which received data is input increases, and the characteristics of these transistors are reduced. The offset cancel control circuit for correcting the fluctuation also increases.
- this type of technology includes, for example, those described in the following documents.
- the AZD converter described in Patent Document 1 includes an offset cancel circuit that detects an offset independently of the voltage comparison circuit and generates a cancel signal corresponding thereto.
- the voltage comparison circuit compares the signal voltage with the reference voltage, and adds a reverse offset for canceling the offset of the input of the voltage comparison circuit to the offset based on the offset cancellation signal.
- the reference voltage is generated by a voltage dividing circuit.
- the switch circuit In the offset detection period, a signal voltage is supplied to the reference voltage input terminal and the signal voltage input terminal of each voltage comparison circuit, and the voltage comparison circuit outputs a comparison result corresponding to the input offset.
- the offset cancellation circuit generates an offset cancellation signal based on the comparison result.
- an input multilevel signal is amplified by a DC amplifier with an offset adjustment function.
- This amplified output is identified by the AZD converter and output with at least (N + 2) bits.
- the duobinary AM 'PSK demodulation circuit described in Patent Document 4 includes two comparison circuits that perform ternary determination of a baseband signal and one comparison circuit that performs binary determination. It is. It takes advantage of the fact that a ternary value is obtained for a specific pattern, and this is detected by the coincidence detection circuit. In most other cases, the output is switched to the output of a comparison circuit that performs binary determination. This reduces the decision error rate due to sampling clock jitter, waveform distortion, and noise.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-165241
- Patent Document 2 Japanese Patent Laid-Open No. 09-130172
- Patent Document 3 Japanese Patent Publication No. 06-Oi 122
- Patent Document 4 Japanese Patent Publication No. 06-091560
- the conventional data receiving apparatus has the following problems.
- duo binary transmission it is possible to suppress timing deterioration due to signal attenuation and intersymbol interference, which are factors that hinder high-speed operation.
- high-speed transmission increases the transmission distance. Accordingly, the eye opening is reduced.
- the data receiving apparatus in FIG. 2 needs a mechanism for canceling the offset caused by the variation in threshold voltage between the differential pair transistors on the input side.
- the data receiver needs two sampling latches with multi-valued determination, and accordingly, two offset cancellation mechanisms and two control circuits that control the offset cancellation mechanism are also required.
- the duobinary AM 'PSK demodulator circuit described in Patent Document 4 reduces the determination error rate due to jitter, waveform distortion, noise, etc. of the sampling clock. However, the above problems are not improved.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a data receiving device in which the circuit scale and power consumption are reduced, and a semiconductor integrated circuit including the data receiving device.
- the invention according to claim 1 relates to a data receiving device that receives duo'binary data, amplifies the received duo'binary data with a predetermined gain, and outputs the amplified data Cancel the offset of the amplifier circuit and the output signal of the amplifier circuit
- the received duobinary data is sampled by sampling the output signal of the offset cancellation unit and the amplification circuit based on a first reference voltage and a second reference voltage lower than the first reference voltage.
- the invention according to claim 2 relates to the data receiving device according to claim 1, wherein the duo 'binary data is constituted by differential data, and the amplifier circuit inputs the differential data. It has two transistors and is composed of a differential amplifier that amplifies the differential data and outputs an output signal differentially, and the offset canceling unit controls the current flowing through the output unit of each transistor.
- the configuration is such that the offset of the output signal is canceled out! /
- the invention according to claim 3 relates to the data receiving device according to claim 2, wherein the data determination unit samples the output signal of the amplifier circuit based on the first and second reference voltages.
- a first multi-value determining circuit for determining whether the received duo 'binary data is at a high level or an intermediate level among the three values constituting the duo' binary data; and
- a first sampling latch that latches the first determination signal of the multi-level determination circuit, and the output signal of the amplifier circuit are sampled based on the first and second reference voltages, thereby receiving the received duo signal.
- a second multi-value determination circuit for determining whether binary data is at a low level or an intermediate level of the three values constituting the duo-binary data; and a second determination of the second multi-value determination circuit Ladder the signal It is composed of a second sampling latch and /
- the invention according to claim 4 relates to a data receiving apparatus that receives duo 'binary data, wherein the received duo' binary data is received at a first level lower than the first reference voltage and the first reference voltage.
- a data determination unit that determines whether the received duo-binary data is one of three values constituting the duo-binary data by sampling based on the reference voltage of 2;
- the data determination unit samples the received duo'noinary data based on the first reference voltage, so that the received duobinary data includes the three values constituting the duobinary data.
- a first multi-level determination circuit that determines whether the first multi-level determination circuit is at a high level or an intermediate level, a first sampling latch that latches a first determination signal of the first multi-level determination circuit, and the received duo ' By sampling binary data based on the second reference voltage, it is determined whether the received duo'binary data is at a low level or an intermediate level among the three values constituting the duo'binary data. It comprises a second multi-value determination circuit for determining and a second sampling latch for latching the second determination signal of the second multi-value determination circuit! /
- the invention according to claim 5 relates to the data receiving device according to claim 4, wherein the first multi-value determination circuit cancels an offset of the first determination signal of its own circuit.
- a set cancellation unit is included, and the second multi-value determination circuit includes a second offset cancellation unit that cancels an offset of the second determination signal of its own circuit.
- the invention according to claim 6 relates to the data receiving device according to claim 4 or 5, wherein the duo is provided.
- each of the first and second multi-value determination circuits has two transistors for inputting the differential data, and amplifies and outputs the differential data.
- a differential amplifier for outputting a signal differentially, and the first and second offset canceling units each control a current flowing through an output unit of each of the transistors of each of the differential amplifiers.
- the first and second determination signal offsets are cancelled, and are characterized in that.
- the invention according to claim 7 relates to the data receiving device according to claim 6, wherein the data determination unit converts the received duo 'binary data to V based on the first and second reference voltages. Sampling the received duobinary data to determine whether the received duobinary data is at a high level or an intermediate level among the three values constituting the duobinary data; A first sampling latch that latches a first determination signal of a multi-value determination circuit of 1 and sampling the received duo 'binary data based on the first and second reference voltages.
- a second multi-value determination circuit for determining whether the received duo-binary data is at a low level or an intermediate level of the three values constituting the duo 'binary data; and the second multi-value determination Times
- a second determination signal It consists of a second sampling latch that latches, and is characterized by! /
- the invention according to claim 8 relates to the data receiving device according to claim 4, 5, 6 or 7, wherein the first sampling latch receives the first determination signal as a plurality of clocks having different phases.
- the second sampling latch is composed of a plurality of latch circuits that latch the second determination signal in synchronization with the plurality of clock signals, respectively. It is composed and is characterized by
- the invention according to claim 9 relates to a semiconductor integrated circuit, and is characterized by comprising the data receiving device according to any one of claims 1 to 8.
- the output signal obtained by amplifying duo 'binary data by the amplifier circuit is determined by sampling by the data determination unit, erroneous determination in the data determination unit is reduced.
- the amplifier circuit is configured to cancel the offset of the output signal of its own circuit, erroneous determination in the data determination unit is further reduced. Also, because only one configuration is required to cancel the offset of the output signal of the amplifier circuit,
- the area occupied by the offset cancellation mechanism and the control circuit in the semiconductor integrated circuit can be reduced, and the power consumption can be reduced.
- the data determination unit includes the first multi-value determination circuit, the first sampling latch, the second multi-value determination circuit, and the second sampling latch.
- the operation speed of the second multi-value determination circuit can be improved.
- the data determination unit samples the duo'binary data using the first reference voltage (or the first and second reference voltages), so that the duo'binary data is at a high level or intermediate level.
- the first multi-value determination circuit for determining whether the level is the same, the first sampling latch for latching the first determination signal of the first multi-value determination circuit, and the duo 'binary data to the second
- the reference voltage or the first and second reference voltages
- the amplifier circuit is composed of a differential amplifier that amplifies the duo binary data composed of differential data and outputs the output signal differentially, so that noise and distortion of the signal of each part are reduced, Misjudgments in the data judgment section can be further reduced. Since the first and second multi-value determination circuits have differential amplifiers that amplify the binary data composed of differential data and output the output signal differentially, the data determination unit It is possible to further reduce misjudgment.
- FIG. 1 is a waveform diagram of received data subjected to duo-binary transmission.
- FIG. 2 is a block diagram showing an electrical configuration of a data receiving apparatus for receiving duo 'binary-transmitted data.
- FIG. 3 is a circuit diagram showing an electrical configuration of sampling latch 1 with multi-value determination in FIG.
- FIG. 4 is a time chart for explaining the operation of the data receiving apparatus shown in FIG.
- FIG. 5 is a block diagram showing an electrical configuration of a parallel-type data receiving apparatus.
- FIG. 6 is a time chart for explaining the operation of the data receiving apparatus shown in FIG.
- FIG. 7 is a block diagram showing the electrical configuration of the main part of the data receiving apparatus according to the first embodiment of the present invention.
- FIG. 8 is a circuit diagram showing an electrical configuration of amplifier 41 in FIG. 7.
- FIG. 9 is a circuit diagram showing an electrical configuration of sampling latch 43 with multi-value determination in FIG.
- FIG. 10 is a time chart of signals of respective parts for explaining the operation of the data receiving apparatus shown in FIG.
- FIG. 11 is a block diagram showing an electrical configuration of a main part of a data receiving apparatus according to a second embodiment of the present invention.
- FIG. 12 is a circuit diagram showing an electrical configuration of multi-value determination circuit 81 in FIG. 11.
- FIG. 13 is a circuit diagram showing an electrical configuration of sampling latch 82 in FIG. 11.
- FIG. 14 is a block diagram showing an electrical configuration of a main part of a data receiving apparatus according to a third embodiment of the present invention.
- FIG. 15 is a circuit diagram showing an electrical configuration of multilevel determination circuit 81A with offset cancellation in FIG.
- FIG. 16 is a block diagram showing an electrical configuration of a data receiving apparatus having a configuration in which the data receiving apparatus shown in FIG. 14 is parallelized.
- FIG. 17 is a time chart for explaining the operation of the data receiving apparatus shown in FIG.
- an output signal obtained by amplifying duo 'binary data by an amplifier is sampled by a sampling latch with multi-value determination, whereby the value of duo-binary data is determined, and multi-value
- a data reception device provided with a multi-value determination circuit with offset cancellation that performs determination and offset cancellation by the same circuit, and a semiconductor integrated circuit including the data reception device.
- FIG. 7 is a block diagram showing an electrical configuration of the main part of the data receiving apparatus according to the first embodiment of the present invention.
- the data receiving apparatus of this example includes an amplifier 41 and an offset cancel It comprises a control circuit 42, sampling latches 43 and 44 with multi-level determination, and a decoder 45.
- the amplifier 41 receives duo 'binary data dat transmitted from a transmitter (not shown), amplifies it with a predetermined gain, and generates an output signal p.
- Duo 'binary data dat has ternary data consisting of high level ("2"), low level (“0") and intermediate level (“1").
- the amplifier 41 is configured to be able to cancel the offset of the output signal p.
- the duo'binary data dat is composed of differential data, and the amplifier 41 has the difference.
- the offset cancel control signal from the offset cancel control circuit 42 is composed of a differential amplifier that has two transistors that input dynamic data, amplifies the differential data, and outputs the output signal P differentially. Based on cl and c2, the offset of the output signal p is canceled by controlling the current flowing through the output of each transistor.
- the operating frequency band of the amplifier 41 may be the 2Z3 frequency band of the transmission data rate.
- the amplifier 41 will need a 5 GHz frequency band, which is the symbol rate of lOGbps data. Should have a frequency band of about 3.3GHz, which is 2Z3 of 5GHz. For this reason, if an amplifier with a slower operating speed than the sampling latch is installed in front of the sampling latch, which has a higher operating speed, it is a factor that limits the high-speed operation of the receiving device, whereas the duo binary In the case of transmission, even if the amplifier 41 is provided, the operating speed does not decrease.
- the sampling latch 43 with multi-level determination samples the output signal p of the amplifier 41 on the basis of a relatively high level reference voltage Vref + for discriminating between the intermediate level and the high level. And the determination signal a is output differentially.
- the sampling latch 44 with multi-level determination samples the output signal p of the amplifier 41 based on a comparatively low level reference voltage Vref ⁇ for determining an intermediate level and a low level.
- the data of p is judged and the judgment signal b is output differentially.
- Vref- has a lower voltage level than Vref +.
- the decoder 45 restores the originally transmitted transmission data by decoding the determination signals a and b.
- this data receiving device is a semiconductor It is provided in an integrated circuit.
- FIG. 8 is a circuit diagram showing an electrical configuration of amplifier 41 in FIG.
- the amplifier 41 is composed of HMOS 51 and 52, resistors 53 and 54, an nMOS 55, and talent offset cancellations 56 and 57.
- nMOS 51 and 52 input differential data of duo 'binary data dat.
- the nMOS 55 operates as a constant current circuit with a current source bias applied to the gate electrode.
- the offset cancellations 56 and 57 are configured by a variable resistance unit such as a source follower of a MOS transistor, for example, and control current based on offset cancellation control signals cl and c2 from the offset cancellation control circuit 42.
- the current flowing through the offset cancellation 56 is controlled based on the offset cancellation control signal cl from the offset cancellation control circuit 42, and the offset is controlled based on the offset cancellation control signal c2 from the offset cancel control circuit 42.
- the current flowing through the Tokiyan cell 57 is controlled.
- the offset cancel 56 current to the nMOS 51 drain current the current flowing through the output of the nMOS 51 is controlled, and by adding the offset cancel 57 current to the nMOS 52 drain current, the nMOS 52
- the output current p is controlled, and the differential output signal p from which offset caused by variations in the threshold voltages of the nMOSs 51 and 52 is canceled is output from the terminals OUT and OUTB.
- FIG. 9 is a circuit diagram showing an electrical configuration of sampling latch 43 with multi-value determination in FIG.
- Multi-level half U fixed sampling latch 43 ⁇ , Fig. 9 [As shown, pMOS61, 62, 63, 64, 65, 66, 67, nMOS68, 69, 70, 71, 72, 73 , 74 and force!
- the sampling latch 43 with multi-value determination determines a minute magnitude relationship between the differential output signal p of the amplifier 41 and the reference voltages Vref + and Vref ⁇ when the clock CLK is input.
- Vref- Vref-
- the sampling latch 44 with multivalued judgment has the same configuration, but the reference voltage Vref + is applied to the gate of the nMOS 72, and is applied to the gate of the reference voltage Vref-power MOS 73! /, The
- FIG. 10 is a signal timing chart of each part for explaining the operation of the data receiving apparatus shown in FIG. 7.
- the vertical axis represents the logic level, and the horizontal axis represents the time.
- the transmitted duobinary data dat is amplified by the amplifier 41, and an output signal p is output.
- the output signal p is displayed as an amplified version of the first eye opening Bl, B2,... And the second eye opening Al, A2,. Is done.
- the offset of the output signal p of the amplifier 41 is canceled based on the offset cancel control signals cl and c2 from the offset cancel control circuit 42.
- the first and second eye opening force sampling latches 43 and 44 with multi-value determination are based on the reference voltages Vref + and Vref-.
- the value of the output signal p is determined, and the determination signals a and b are output.
- the determination signals a and b are decoded by the decoder 45, and the originally transmitted transmission data is restored.
- the output signal p obtained by amplifying the duo'binary data dat by the amplifier 41 is sampled by the sampling latches 43 and 44 with multi-value determination, whereby the output signal Since the data of p is determined, erroneous determination is reduced even if the characteristics of the sampling latches 43 and 44 with multi-value determination vary.
- the amplifier 41 since the offset of the output signal p is canceled based on the offset cancel control signals cl and c2 of the offset cancel control circuit 42, the sampling latches 43 and 44 with multi-value determination are canceled. The erroneous determination in is further reduced. Also, only one offset cancel control circuit 42 is required.
- the amplifier 41 is composed of a differential amplifier that amplifies the duo binary data dat composed of differential data and outputs the output signal p differentially, reducing the noise and distortion of the signals in each part.
- the erroneous determination in the sampling latches 43 and 44 with multi-value determination is further reduced.
- FIG. 11 is a block diagram showing the electrical configuration of the main part of the data receiving apparatus according to the second embodiment of the present invention, and is common to the elements in FIG. 7 showing the first embodiment. Elements have a common sign.
- multi-value determination circuits 81 and 83 and sampling latches 82 and 84 are provided in place of the sampling latches with multi-value determination 43 and 44 in FIG. 7, multi-value determination circuits 81 and 83 and sampling latches 82 and 84 are provided. It has been.
- the multilevel determination circuit 81 determines the data of the output signal p by sampling the output signal p of the amplifier 41 based on the reference voltage Vref +, and outputs the determination signal u.
- the sampling latch 82 latches the determination signal u in synchronization with the clock signal CLK and outputs it as the determination signal a.
- the multi-level determination circuit 83 determines the data of the output signal p by sampling the output signal p of the amplifier 41 based on the reference voltage Vref ⁇ , and outputs the determination signal V.
- the sampling latch 84 latches the determination signal V in synchronization with the clock signal CLK and outputs it as the determination signal b.
- the other configuration is the same as that shown in FIG.
- FIG. 12 is a circuit diagram showing an electrical configuration of multi-value determination circuit 81 in FIG.
- this multi-value half IJ constant circuit 81 includes nMOS 91 and 92, resistors 93 and 94, n
- MOS95, 96, 97 and power are also composed.
- the multi-value determination circuit 83 has the same configuration, but the reference voltage Vref + is applied to the gate of the nMOS 96, and is applied to the gate of the reference voltage Vref ⁇ power 3 ⁇ 4MOS97.
- FIG. 13 is a circuit diagram showing an electrical configuration of the sampling latch 82 in FIG. 11. Elements common to those in FIG. 9 showing the first embodiment are denoted by common reference numerals. Yes. As shown in FIG. 13, the sampling latch 82 has a configuration in which the nMOSs 72 and 73 in FIG. 9 are deleted. The other configuration is the same as the configuration shown in FIG. The sampling latch 84 has the same configuration.
- the multilevel determination circuits 81 and 83 and the sampling latches 82 and 84 are provided in place of the sampling latches 43 and 44 with multilevel determination in FIG. Therefore, in addition to the advantages of the first embodiment, since the gains of the input differential pair MOS transistors (nMOS 91, 92) of the multi-level determination circuits 81, 83 are all used for data determination, the multi-level determination circuit 81 , 83 operating speed is improved.
- FIG. 14 is a block diagram showing the electrical configuration of the main part of the data receiving apparatus according to the third embodiment of the present invention. Elements common to those in FIG. It is attached.
- the amplifier 41 in FIG. 11 is omitted, and the multilevel determination circuits 81 A, 83 with offset cancellation are used instead of the multilevel determination circuits 81, 83.
- A is provided, and an offset cancel control circuit 85 similar to the offset cancel control circuit 42 is provided.
- Multi-level decision circuit 81 A, 83 A with offset cancellation determines the value of duo'binary data dat by sampling duo'binary data dat based on reference voltages Vref +, Vref- , V is output.
- the multi-value determination circuits 81 A and 83A are configured to be able to cancel the offset of the determination signals u and v, and the duo'binary data dat is composed of differential data and is subjected to multi-value determination.
- the circuits 81A and 83A have two transistors for inputting the differential data, are configured by a differential amplifier that amplifies the differential data and outputs an output signal differentially, and the offset cancel cell control circuit 42 Based on the offset cancel control signals cl, c2, dl, d2 of 85, the current flowing in the output part of each transistor is controlled to cancel the offset of the judgment signals u, V.
- the other configuration is the same as the configuration shown in FIG.
- FIG. 15 is a circuit diagram showing an electrical configuration of the multi-value determination circuit 81 A with offset cancellation in FIG. 14. Elements common to the elements in FIG. 12 showing the second embodiment are shown in FIG. Common symbols are attached.
- the multi-value determination circuit 81 A with offset cancel the multi-value determination circuit 81 shown in FIG. 99 is added.
- the multi-level determination circuit 83A is also configured to cancel the offset of the determination signal V based on the offset cancellation control signals dl and d2.
- the other configuration is the same as the configuration shown in FIG.
- FIG. 16 is a block diagram showing an electrical configuration of a data receiving apparatus having a configuration in which the data receiving apparatus shown in FIG. 14 is parallelized.
- sampling latches 101 and 102 in addition to the configuration of the data receiving apparatus shown in FIG. 14, sampling latches 101 and 102, an inverter 103, and flip-flops 104, 105, 106, and 107 are provided.
- a decoder 45A is provided.
- the inverter 103 inverts the clock signal CLK and outputs the clock signal CLKB.
- the sampling latches 101 and 102 latch the determination signals u and v from the multi-level determination circuits 81A and 83A in synchronization with the clock signal CLKB, and output the determination signals e and f as latch signals.
- the flip-flops 104, 105, 106, and 107 send the determination signals a, b, e, and f to the decoder 45A in synchronization with the clock signal CLK.
- the decoder 45A restores the originally transmitted transmission data by decoding the determination signals a, b, e, and f.
- FIG. 17 is a time chart for explaining the operation of the data receiving apparatus shown in FIG.
- the operation speed is halved by using two clock signals, clock signals CLK and CLKB, as shown in FIG.
- the offset cancel mechanism is provided in the two multi-value determination circuits 81A and 83A, and the offset latch mechanism and the offset cancel control circuit are required.
- the two offset cancel cell control circuits 42 and 85 have the same function.
- the amplifier 41 in FIG. 11 is deleted, and instead of the multi-value determination circuits 81 and 83, the multi-value determination circuits 81 A, 83A with offset cancellation and Since the offset cancel control circuit 85 is provided, there is no first stage amplifier that requires two offset cancel mechanisms and two control circuits respectively, so that power consumption is reduced.
- the multilevel determination circuits 81A and 83A have differential amplifiers that amplify the duo 'binary data dat composed of differential data and output an output signal differentially, False judgments at the sampling latches 82, 84, 101, 102 are further reduced.
- the sampling latches 82 and 84 operate in synchronization with the clock signal CLK, and the sampling latches 101 and 102 operate in synchronization with the clock signal CLKB.
- a plurality of sampling latches that operate in synchronization with a plurality of clock signals having different phases may be added, for example, a configuration that operates in parallel with four-phase or eight-phase clock signals.
- the number of offset cancellation mechanisms and their control circuits does not depend on the number of sampling latches, and is one in the configuration shown in FIGS. 7 and 11 and only two in the configurations shown in FIGS. 14 and 16. . As a result, high-speed operation by parallelization and reduction of the offset cancel mechanism and control circuit are realized at the same time.
- the duo 'binary data dat, the output signal p of the amplifier 41, and the determination signals a and b are transmitted as differential data by the balanced transmission method.
- the unbalanced transmission method may be used.
- the present invention is generally applied to data receiving apparatuses that receive duo 'binary-transmitted data. Applicable.
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Abstract
Description
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Priority Applications (2)
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US12/294,217 US20090232248A1 (en) | 2006-03-24 | 2007-01-22 | Data receiving device and semiconductor integrated circuit including such data receiving device |
JP2008507384A JPWO2007111035A1 (ja) | 2006-03-24 | 2007-01-22 | データ受信装置及び該データ受信装置を備える半導体集積回路 |
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JP2006083576 | 2006-03-24 | ||
JP2006-083576 | 2006-03-24 |
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WO2007111035A1 true WO2007111035A1 (ja) | 2007-10-04 |
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PCT/JP2007/050900 WO2007111035A1 (ja) | 2006-03-24 | 2007-01-22 | データ受信装置及び該データ受信装置を備える半導体集積回路 |
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US (1) | US20090232248A1 (ja) |
JP (1) | JPWO2007111035A1 (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011030780A1 (ja) * | 2009-09-09 | 2011-03-17 | 日本電気株式会社 | ラッチ回路およびラッチ回路における電位補正方法 |
JP2011223553A (ja) * | 2010-03-26 | 2011-11-04 | Fujitsu Ltd | 増幅回路及びその増幅回路を含むアナログデジタル変換回路 |
JP2012039548A (ja) * | 2010-08-11 | 2012-02-23 | Renesas Electronics Corp | ダイナミック増幅器 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10365833B2 (en) * | 2016-01-22 | 2019-07-30 | Micron Technology, Inc. | Apparatuses and methods for encoding and decoding of signal lines for multi-level communication architectures |
KR20220026773A (ko) * | 2020-08-26 | 2022-03-07 | 삼성전자주식회사 | 저전력 입출력을 위한 송신기, 수신기 및 이를 포함하는 메모리 시스템 |
Citations (3)
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JPS6460132A (en) * | 1987-08-31 | 1989-03-07 | Yokogawa Electric Corp | Duo-binary signal demodulating circuit |
JP2001111421A (ja) * | 1999-10-06 | 2001-04-20 | Hitachi Ltd | オフセットキャンセル回路及びa/d変換器 |
JP2002516046A (ja) * | 1997-03-21 | 2002-05-28 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | フラッシュ型ad変換器を使用するオフセット補償を具備したワイヤレス受信器 |
Family Cites Families (3)
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FR2565448B1 (fr) * | 1984-06-04 | 1986-10-10 | France Etat | Procede et dispositif d'extraction de synchronisation pour systeme de diffusion a multiplexage temporel de signaux numeriques et analogiques |
DE69620272T2 (de) * | 1996-09-24 | 2003-07-24 | Hewlett Packard Co | Datenverabeitungsgerät und -verfahren |
JP4056672B2 (ja) * | 2000-02-29 | 2008-03-05 | シャープ株式会社 | 半導体装置および表示装置モジュール |
-
2007
- 2007-01-22 WO PCT/JP2007/050900 patent/WO2007111035A1/ja active Application Filing
- 2007-01-22 US US12/294,217 patent/US20090232248A1/en not_active Abandoned
- 2007-01-22 JP JP2008507384A patent/JPWO2007111035A1/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6460132A (en) * | 1987-08-31 | 1989-03-07 | Yokogawa Electric Corp | Duo-binary signal demodulating circuit |
JP2002516046A (ja) * | 1997-03-21 | 2002-05-28 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | フラッシュ型ad変換器を使用するオフセット補償を具備したワイヤレス受信器 |
JP2001111421A (ja) * | 1999-10-06 | 2001-04-20 | Hitachi Ltd | オフセットキャンセル回路及びa/d変換器 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011030780A1 (ja) * | 2009-09-09 | 2011-03-17 | 日本電気株式会社 | ラッチ回路およびラッチ回路における電位補正方法 |
JP5454582B2 (ja) * | 2009-09-09 | 2014-03-26 | 日本電気株式会社 | ラッチ回路およびラッチ回路における電位補正方法 |
JP2011223553A (ja) * | 2010-03-26 | 2011-11-04 | Fujitsu Ltd | 増幅回路及びその増幅回路を含むアナログデジタル変換回路 |
JP2012039548A (ja) * | 2010-08-11 | 2012-02-23 | Renesas Electronics Corp | ダイナミック増幅器 |
Also Published As
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US20090232248A1 (en) | 2009-09-17 |
JPWO2007111035A1 (ja) | 2009-08-06 |
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