WO2022259971A1 - Drive circuit and solid-state imaging element - Google Patents

Abstract

The present invention achieves both an increase in transmission speed and noise suppression in a circuit in which a driver is disposed.　This drive circuit comprises a drive unit and a transformer. In the drive circuit comprising the drive unit and the transformer, the transformer is provided with a plurality of magnetically coupled coils. Further, in the drive circuit, the drive unit supplies a non-differential signal or a differential signal to the transformer provided with the plurality of magnetically coupled coils.

Description

Driving circuit and solid-state imaging device

This technology relates to drive circuits. More specifically, the present invention relates to a driver circuit for transmitting differential signals and single-phase signals, and a solid-state imaging device.

Conventionally, a driver such as a differential driver is arranged in the transmission side circuit in an interface such as MIPI (Mobile Industry Processor Interface). The larger the output capacity of this circuit, the longer the rise time and fall time of the signal to be transmitted, and the lower the transmission speed. Therefore, in order to shorten the rise time and fall time, there has been proposed an electronic component in which a coil is inserted in the transmission line on the output side of the differential driver (see, for example, Patent Document 1).

Japanese Patent No. 5872710

In the conventional technology described above, the transmission speed is improved by inserting a coil. However, if the inductance of the coil is large, the rising and falling edges become steep, making it difficult to suppress noise due to EMI (Electro Magnetic Interference). As described above, it is difficult to improve the transmission speed and suppress noise at the same time with the above-described electronic component.

This technology was created in view of this situation, and aims to achieve both improved transmission speed and noise suppression in circuits where drivers are arranged.

The present technology has been made to solve the above-described problems, and a first aspect thereof is a transformer provided with a plurality of magnetically coupled coils, a non-differential signal and a differential signal to the transformer, wherein the plurality of coils includes first and second coils that are magnetically coupled, and the drive unit supplies one of the first coil and One end of each of the first and second coils is connected to one end of the second coil, and when a common-mode current is caused to flow into each of the one ends of the first and second coils, the magnetic flux generated by each of the first and second coils is They are drive circuits that weaken each other. This brings about the effect of reducing the inductance during non-differential signal transmission.

Further, in this first aspect, the driving section supplies the differential signal to one end of the first coil and one end of the second coil, and the driving section supplies one end of the first coil. and one end of the second coil may be supplied with the differential signal. This brings about the effect that the signal is transmitted via two lines.

Also, in this first aspect, a first ESD protection diode connected to a node between both ends of the first coil and a second ESD protection diode connected to a node between both ends of the second coil. An ESD protection diode may also be provided. This brings about the effect of improving the waveform.

Further, in this first aspect, the driving section includes a shared driver that supplies either the differential signal or the non-differential signal, and an output voltage control section that controls the output voltage of the shared driver. may This brings about the effect of reducing the number of drivers.

Further, in this first aspect, the driving section may be arranged on a predetermined semiconductor chip, and the transformer may be arranged outside the semiconductor chip. This brings about the effect of reducing the circuit scale of the semiconductor chip.

Further, in this first aspect, the driving section may include a differential driver that supplies the differential signal and a non-differential driver that supplies the non-differential signal. This has the effect of eliminating the need to control the output voltage of the driver.

Also, in this first aspect, the output terminal of the non-differential driver may be connected to a node between either end of the first and second coils. This has the effect of eliminating the need for connection to the center tap.

Also, in this first aspect, the output terminal of the non-differential driver may be connected to one end of the first and second coils. This brings about the effect of improving the waveform.

Further, in this first aspect, the driving section may be arranged on a predetermined semiconductor chip, and the transformer may be arranged outside the semiconductor chip. This brings about the effect of reducing the circuit scale of the semiconductor chip.

Also, in this first aspect, the plurality of coils includes first, second, and third coils that are magnetically coupled, and the driving section includes one end of the first coil and the second coil. When the differential signal is supplied to one end of the coil of and the one end of the third coil, and a common-mode current is caused to flow into the one end of each of the second and third coils, the second and third coils are supplied with the differential signal. The magnetic fluxes created by each of the coils may weaken each other. This brings about the effect that the signal is transmitted through the three lines.

Further, the first aspect further includes a receiving section that receives differential signals via the first and second signal lines, the driving section includes first and second output terminals, and the The one end of the first coil is connected to the first output terminal, the other end is connected to the first signal line, and the one end of the second coil is connected to the second output terminal. and the other end may be connected to the second signal line. This brings about the effect that the differential signal from the driving section is input to the receiving section via the first and second coils.

Further, in this first aspect, the first and second coils share a predetermined winding axis, and when viewed from the direction of the winding axis, the output terminal of the wiring of the first coil The winding direction around the winding axis from one connected end to the other end connected to the signal line is from the one end connected to the output terminal of the wiring of the second coil to the other end connected to the signal line. It may be in a direction opposite to the winding direction around the winding axis up to. As a result, when in-phase currents flow into one end connected to the drive of the first coil and one end connected to the drive section of the second coil, the magnetic fluxes generated by the coils weaken each other.

A second aspect of the present technology is a transformer provided with a plurality of magnetically coupled coils, and supplying either a non-differential signal or a differential signal to the transformer according to a predetermined control signal. and a logic circuit that designates either the non-differential signal or the differential signal according to the control signal and supplies the signal to the driving unit, wherein the plurality of coils are magnetically coupled. The driver includes first and second coils, and the driver is connected to one end of the first coil and one end of the second coil and is in phase with the one end of each of the first and second coils. This is a solid-state imaging device in which magnetic fluxes generated by the first and second coils weaken each other when a current is supplied. This brings about the effect of reducing the inductance with respect to the non-differential signal when the logic circuit transmits the non-differential signal.

It is a block diagram showing an example of 1 composition of an imaging device in a 1st embodiment of this art. It is a block diagram showing an example of 1 composition of a solid-state image sensing device in a 1st embodiment of this art. 1 is a circuit diagram showing a configuration example of a drive circuit according to a first embodiment of the present technology; FIG. It is a top view showing the winding direction of the coil in a 1st embodiment of this art. FIG. 4 is a circuit diagram showing a configuration example of a drive circuit in a comparative example; It is a figure for comparing the inductance of a 1st embodiment of this art, and a comparative example. 4A and 4B are timing charts showing an example of the operation of the drive circuit in the first embodiment and the comparative example of the present technology; It is a circuit diagram which shows one structural example of the drive circuit in 2nd Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 3rd Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 4th Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 5th Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 6th Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 7th Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 8th Embodiment of this technique. It is a circuit diagram which shows one structural example of the drive circuit in 9th Embodiment of this technique. 1 is a block diagram showing a schematic configuration example of a vehicle control system; FIG. FIG. 4 is an explanatory diagram showing an example of an installation position of an imaging unit;

Hereinafter, a form for carrying out the present technology (hereinafter referred to as an embodiment) will be described. Explanation will be given in the following order.
1. First embodiment (example of providing two magnetically coupled coils)
2. Second embodiment (an example in which two magnetically coupled coils are provided and a driver is connected to the center tap)
3. Third embodiment (an example in which two magnetically coupled coils are provided and a diode is connected)
4. Fourth Embodiment (Example of providing two magnetically coupled coils sharing a driver)
5. Fifth embodiment (an example in which two magnetically coupled coils are arranged outside the chip)
6. Sixth Embodiment (Example of applying the third embodiment to the second embodiment)
7. Seventh Embodiment (Example of applying the fourth embodiment to the third embodiment)
8. Eighth embodiment (an example in which the fifth embodiment is applied to the fourth embodiment)
9. Ninth embodiment (example in which three magnetically coupled coils are provided)
10. Example of application to mobile objects

<1. First Embodiment>
[Configuration example of imaging device]
FIG. 1 is a block diagram showing a configuration example of an imaging device 100 according to the first embodiment of the present technology. This imaging device 100 is a device for capturing image data, and includes a solid-state imaging device 200 provided on a mounting substrate 110 and a receiving section 130 .

The solid-state imaging device 200 generates image data by photoelectric conversion. The solid-state imaging device 200 supplies image data to the receiving section 130 via the transmission line 120 on the mounting board 110 . MIPI, for example, is used as a standard for a communication interface between the solid-state imaging device 200 and the receiving section 130 . A communication interface other than MIPI can also be used.

The receiving unit 130 receives image data and performs predetermined image processing on the image data. For example, an application processor is used as the receiving unit 130 . Image recognition processing and the like are executed as the image processing.

[Configuration example of solid-state imaging device]
FIG. 2 is a block diagram showing a configuration example of the solid-state imaging device 200 according to the first embodiment of the present technology. This solid-state imaging device 200 comprises a pixel chip 201 and a circuit chip 202 which are stacked. These chips are electrically connected through connections such as vias. In addition to vias, Cu--Cu bonding or bumps may be used for connection. These other methods (magnetic coupling, etc.) can also be used for connection. Also, although two chips are stacked, three or more layers can be stacked.

A plurality of pixels 210 are arranged in a two-dimensional grid on the pixel chip 201 . In the pixel chip 201, a vertical signal line 219 is wired for each column of the pixels 210. FIG. The pixel 210 generates an analog pixel signal by a photoelectric conversion element. The pixels 210 supply pixel signals to the circuit chip 202 via vertical signal lines 219 .

The circuit chip 202 includes an analog-to-digital converter 220 , a logic circuit 230 , a serializer 240 and a drive circuit 300 . The analog-to-digital converter 220 performs AD (Analog to Digital) conversion on each pixel signal. In the analog-to-digital converter 220, for example, an ADC (Analog to Digital Converter) is arranged for each column, and converts analog pixel signals into digital signals for each column. The analog-to-digital converter 220 supplies the digital signal for each pixel to the logic circuit 230 .

The logic circuit 230 performs predetermined signal processing on digital signals. CDS (Correlated Double Sampling) processing and the like are executed as the signal processing. The logic circuit 230 outputs the processed digital signal to the serializer 240 in parallel.

The logic circuit 230 also supplies control signals DIF and SC to the drive circuit 300 . These control signals are signals for controlling the drive circuit 300 to either a differential signal output state or a non-differential signal output state.

The differential signal output state is an operating state in which the drive circuit 300 supplies differential signals. A non-differential signal output state is an operating state in which the drive circuit 300 provides a pair of signals with in-phase transitions or single-phase transitions. A common mode transition means that both of a pair of signals transition to a high or low level at the same time. A monophasic transition means that only one of a pair of signals transitions to a high or low level. Hereinafter, a signal that undergoes a common-phase transition will be referred to as a "common-phase signal," and a signal that undergoes a single-phase transition will be referred to as a "single-phase signal." In-phase signals and single-phase signals are collectively referred to as "non-differential signals". In the non-differential signal output state, the drive circuit 300 supplies both a single-phase signal and an in-phase signal, but it is also possible to supply only one of them.

The serializer 240 performs parallel-serial conversion on the digital signal from the logic circuit 230 . The serializer 240 sequentially supplies the digital signal after parallel-serial conversion to the drive circuit 300 via signal lines 241 to 244 bit by bit. A differential signal, a common-mode signal, or a single-phase signal is provided according to the control of the logic circuit 230 . Two of these four signal lines are used for differential signal transmission, and the remaining two are used for non-differential signal transmission (in-phase signal or single-phase signal). It is assumed that the transmission speed of differential signals from the serializer 240 is faster than that of non-differential signals.

The drive circuit 300 adjusts the amplitude, fall time, and rise time of the digital signal from the serializer 240, and drives the transmission line 120 and the receiving circuit. The technique of adjusting the fall time or rise time is called peaking. The driving circuit 300 supplies the peaked digital signal to the receiving section 130 via the signal lines 121 and 122 in the transmission line 120 . Either a differential signal or a non-differential signal is supplied according to the control of the logic circuit 230 . It is also assumed that the amplitude of the differential signal from drive circuit 300 is smaller than that of the non-differential signal.

[Configuration example of drive circuit]
FIG. 3 is a circuit diagram showing a configuration example of the drive circuit 300 according to the first embodiment of the present technology. This drive circuit 300 comprises a drive section 305 and a transformer 360 .

The driving section 305 supplies either a non-differential signal (in-phase signal or single-phase signal) having a larger amplitude than the differential signal or a differential signal to the transformer 360 according to the control signals DIF and SC. This drive section 305 comprises non-differential drivers 310 and 320 and a differential driver 330 . Differential driver 330 comprises drivers 331 and 332 .

The transformer 360 is also provided with magnetically coupled coils 361 and 362 . Also, the inductances of the coils 361 and 362 are substantially the same.

Here, it is assumed that when the coil 361 is assumed to be the primary side and a primary voltage is applied across it, a secondary voltage having a polarity different from that of the primary voltage is generated across the coil 362 . However, in transformer 360, coils 361 and 362 are not used as primary and secondary sides. One end of the coil 361 is connected to the output terminal of the driver 331, and the other end is connected to the signal line 121 on the output side. One end of the coil 362 is connected to the output terminal of the driver 332, and the other end is connected to the signal line 122 on the output side. The drive unit 305 supplies a differential signal to one end of the coil 361 and one end of the coil 362, and causes common-mode currents to flow into one end of the coil 361 connected to the drive unit 305 and one end of the coil 362 connected to the drive unit 305, respectively. , the magnetic fluxes produced by each coil weaken each other. Further, when a differential current is caused to flow into one end of the coil 361 connected to the driving section 305 and one end of the coil 362 connected to the driving section 305, the magnetic fluxes generated by the respective coils strengthen each other.

The coil 361 is an example of the first coil described in the claims, and the coil 362 is an example of the second coil described in the claims.

The winding directions of the coils 361 and 362 will be described in detail with reference to FIG. Coils 361 and 362 share a predetermined winding axis W, and their respective wires are wound around that axis. One end of the wiring 361-1 forming the coil 361 is designated as 361-2, and the other end is designated as 361-3. One end of the wiring 362-1 forming the coil 362 is designated as 362-2, and the other end is designated as 362-3. One ends 361 - 2 and 362 - 2 are connected to drive section 305 . Also, the other ends 361-3 and 362-3 are connected to the receiving section . This figure is a plan view of the coils 361 and 362 viewed from the direction of the winding axis W. FIG. Arrows indicate the direction of current flow when common-mode currents flow from 361-2 and 362-2. The winding direction of the wiring 361-1 of the coil 361 around the winding axis W is opposite to the winding direction of the wiring 362-1 of the coil 362 around the winding axis W. For example, the wire 361-1 is wound clockwise as illustrated in the figure, while the wire 362-1 is wound counterclockwise.

Returning to FIG. 3, the non-differential driver 310 adjusts the amplitude of the non-differential signal from the serializer 240 and supplies it to one end of the coil 361. The non-differential driver 310 includes, for example, an inverter 311 , switches 312 to 315 , a p-channel Metal Oxide Semiconductor (p-channel) transistor 316 and an n-channel MOS (n-channel MOS) transistor 317 . Inverter 311 inverts the signal input to non-differential driver 310 . The switch 312 opens and closes the path between the output terminal of the inverter 311 and the gate of the pMOS transistor 316 according to the control signal SC. The switch 313 opens and closes the path between the output terminal of the inverter 311 and the gate of the nMOS transistor 317 according to the control signal SC. The switch 314 opens and closes the path between the power supply terminal and the gate of the pMOS transistor 316 according to the control signal SC. The switch 315 opens and closes the path between the ground terminal and the gate of the nMOS transistor 317 according to the control signal SC. PMOS transistor 316 and nMOS transistor 317 are connected in series between the power supply terminal and the ground terminal, and the voltage at their connection node is output as the output signal of non-differential driver 310 . When switches 312 and 313 are closed, switches 314 and 315 are open and non-differential driver 310 is activated. When switches 312 and 313 are open, switches 314 and 315 are closed and non-differential driver 310 is deactivated. The circuit configurations of the non-differential driver 320 , the driver 331 , and the driver 332 are similar to that of the non-differential driver 310 . Non-differential signals are input to non-differential drivers 310 and 320 via signal lines 241 and 244 . Differential signals are input to drivers 331 and 332 via signal lines 242 and 243 .

The logic circuit 230 drives the drivers 331 and 332 with the control signal DIF and stops the non-differential drivers 310 and 320 with the control signal SC when transmitting in the differential signal output state.

Also, when transmitting in a non-differential signal output state, the logic circuit 230 drives the non-differential drivers 310 and 320 with the control signal SC, and stops the drivers 331 and 332 with the control signal DIF.

In the non-differential signal output state, the non-differential drivers 310 and 320 supply a non-differential signal Dsc consisting of ?sc1 and Dsc2.

The driver 331 adjusts the amplitude of the positive phase signal Dp of the differential signals and supplies it to one end of the coil 361 . The driver 332 adjusts the amplitude of the anti-phase signal Dn of the differential signals and supplies it to one end of the coil 362 .

It is also assumed that the DC (Direct Current) output voltages of the non-differential drivers 310 and 320 are higher than the drivers 331 and 332 in the differential driver 330 . This causes the amplitude of the slow non-differential signal to be greater than the amplitude of the fast differential signal.

With the circuit configuration illustrated in the figure, in the differential signal output state, the differential driver 330 is driven to supply a high-speed, small-amplitude differential signal to the receiving section 130 via the transformer 360 . In the non-differential signal output state, non-differential drivers 310 and 320 are driven to provide low-speed, large-amplitude in-phase or single-phase signals to receiver 130 via transformer 360 .

Also, by inserting the coils 361 and 362, the rise time and fall time of the differential signal can be shortened in the differential signal output state. This peaking can improve the transmission speed of the differential signal compared to the case where the coils 361 and 362 are not inserted. Also, in the non-differential signal output state, the insertion of coils 361 and 362 shortens the rise time and fall time, but the inductance of these coils is smaller than when these coils are not magnetically coupled. . As a result, the amount of decrease in rise time and fall time is smaller than in the case of no magnetic coupling, and noise due to EMI can be sufficiently suppressed. The reason why the inductance in the non-differential signal output state is relatively small will be described later.

Here, a drive circuit in which a pair of magnetically uncoupled coils is inserted instead of the magnetically coupled coils 361 and 362 is assumed as a comparative example.

FIG. 5 is a circuit diagram showing a configuration example of a drive circuit in a comparative example. As illustrated in the figure, in the comparative example, a pair of coils that are not magnetically coupled are inserted between the output terminals of drivers 331 and 332 and signal lines 121 and 122 .

FIG. 6 is a diagram for comparing inductances between the first embodiment of the present technology and a comparative example. In the first embodiment, the inductance of transformer 360 for differential signals corresponds to the combined inductance of coils 361 and 362 . Assuming that the inductance of each of coils 361 and 362 is L, the inductance L _diff of transformer 360 for differential signals is expressed by the following equation.
L _diff =2L+2M Equation 1
In the above formula, M is mutual inductance and is represented by the following formula.
M=kL Expression 2
In the above equation, k is a coupling coefficient, eg, a positive real number less than 1. Substituting Equation 2 into Equation 1 yields the following equation.
L _diff =2(1+k)L Equation 3

On the other hand, in the comparative example, the total inductance of the pair of coils for the differential signal is 2L.

Next, in the first embodiment, the combined inductance of the transformer 360 with respect to the common-mode signal is expressed by the following equation because the polarities of the mutual inductances are reversed.
(1−k) L/2 Expression 4

On the other hand, in the comparative example, the inductance of the pair of coils for the common-mode signal is L/2.

In order to compare the inductance with respect to the common-mode signal, the inductances of the differential mode first embodiment and the comparative example are matched. For example, the inductance of coils 361 and 362 in the first embodiment is adjusted to L' expressed by the following equation.
L'=L/(1+k) Expression 5

From Equation 5, the inductance L _com of the first embodiment after adjustment is expressed by the following equation.
L _com = {(1−k)/(1+k)}L/2 Equation 6

According to Equation 6, in the first embodiment using the magnetically coupled coils 361 and 362, the inductance with respect to the common-mode signal is smaller than L/2 in the comparative example. As a result, the rise time and fall time are increased compared to the comparative example, and noise due to EMI can be suppressed. Since the inductance for a single-phase signal is L/(1+k), noise due to EMI can be similarly suppressed even in the single-phase mode.

On the other hand, since the inductance of the first embodiment with respect to the differential signal after adjustment is the same as that of the comparative example, it is possible to improve the transmission speed by inserting the coil as in the comparative example.

As described above, by using the magnetically coupled coils 361 and 362, both noise suppression and transmission speed improvement can be achieved.

[Example of drive circuit operation]
FIG. 7 is a timing chart showing an example of the operation of the drive circuit in the first embodiment and the comparative example of the present technology. A in FIG. 4 is a timing chart showing an example of the operation of the drive circuit 300 according to the first embodiment. b in the figure is a timing chart showing an example of the operation of the comparative example.

It is assumed that the differential signal output state is set during the period up to timing T1, and the non-differential signal output state is set after timing T1. As exemplified by a in the figure, in the differential signal output state, a differential signal of a positive phase signal Dp and a negative phase signal Dn having a smaller amplitude than the in-phase signal and the single-phase signal and having a high speed is transmitted. Further, in the non-differential signal output state, a non-differential signal Dsc having a larger amplitude and a lower speed than the differential signal is transmitted. In the figure, a common-mode signal is transmitted as a non-differential signal.

As illustrated in b in the figure, the rise time and fall time of the differential signal in the comparative example are the same as in the first embodiment. However, the rise time dT1 of the common-mode signal is shorter than the rise time _dT0 of the _first embodiment.

As shown in the figure, low-speed, large-amplitude signals are prohibited from differential transitions and are transmitted by single-phase transitions or common-phase transitions. Transformer 360 can also act as an inductor only for differential waveforms, as described above, to reduce the contribution of output capacitance. Therefore, it is possible to suppress the peaking of low-speed, large-amplitude single-phase and common-mode signals while sharpening the rise of high-speed, small-amplitude differential signals, thereby achieving both high-speed operation and EMI suppression.

Thus, according to the first embodiment of the present technology, since the magnetically coupled coils 361 and 362 are provided, the inductance for a common-mode signal and the inductance for a single-phase signal are higher than when coils that are not magnetically coupled are used. Inductance can be lowered. As a result, it is possible to suppress the peaking of the common-phase transition and the single-phase transition, thereby improving the transmission speed and suppressing noise.

<2. Second Embodiment>
In the first embodiment described above, the output terminals of non-differential drivers 310 and 320 are connected to one ends of coils 361 and 362 . However, this configuration may not be able to sufficiently reduce the influence of the output capacitance of non-differential drivers 310 and 320 on the waveform. The drive circuit 300 of the second embodiment differs from the first embodiment in that the connection destinations of the output terminals of the non-differential drivers 310 and 320 are changed.

FIG. 8 is a circuit diagram showing a configuration example of the drive circuit 300 according to the second embodiment of the present technology. The drive circuit 300 of this second embodiment differs from the first embodiment in that the output terminals of the non-differential drivers 310 and 320 are connected to the center taps 365 and 366 of the coils 361 and 362. . This connection can sufficiently reduce the influence of the output capacitance of non-differential drivers 310 and 320 on the waveform.

When the output terminals of non-differential drivers 310 and 320 are connected to center taps 365 and 366, the inductance _Lcom for common mode signals is given by the following equation.
L _com = (1−k) {L/4} Equation 7

Although the output terminals of the non-differential drivers 310 and 320 are connected to the center taps 365 and 366, the connection destination is not limited to the center tap as long as it is a node between both ends of the coils 361 and 362.

In this way, according to the second embodiment of the present technology, since the output terminals of the non-differential driver 310 and the like are connected to nodes (such as center taps) between both ends of the coil, the non-differential driver 310 and 320 can be sufficiently reduced.

<3. Third Embodiment>
In the first embodiment described above, the magnetically coupled coils 361 and 362 are used to reduce the inductance in the non-differential signal output state. However, this configuration may not be able to sufficiently reduce the influence of the output capacitance of the driver on the waveform. The drive circuit 300 of the third embodiment differs from the first embodiment in that ESD (Electro-Static Discharge) protection diodes are connected to coils 361 and 362 .

FIG. 9 is a circuit diagram showing one configuration example of the drive circuit 300 according to the third embodiment of the present technology. The drive circuit 300 of this third embodiment differs from the first embodiment in that it further includes ESD protection diodes 371 to 374 .

The ESD protection diodes 371 and 372 are connected in series between the power terminal and the ground terminal. The connection node of these ESD protection diodes 371 and 372 is connected to the center tap 365 of coil 361 .

The ESD protection diodes 373 and 374 are connected in series between the power terminal and the ground terminal. The connection node of these ESD protection diodes 373 and 374 is connected to the center tap 366 of coil 362 .

The ESD protection diodes 371 and 372 are examples of the first ESD protection diodes described in the claims. ESD protection diodes 373 and 374 are an example of the claimed second ESD protection diodes.

By connecting the ESD protection diodes 371 to 374, the influence of the output capacitance of the driver on the waveform can be sufficiently reduced, and the waveform can be improved as in the second embodiment.

Although the ESD protection diodes 371 to 374 are connected to the center tap, the connection destination is not limited to the center tap as long as it is a node between both ends of the coils 361 and 362.

Thus, according to the third embodiment of the present technology, since the ESD protection diodes 371 to 374 are connected to the coils 361 and 362, it is possible to sufficiently reduce the influence of the output capacitance of the driver on the waveform.

<4. Fourth Embodiment>
In the first embodiment described above, different drivers are used in the differential signal output state and the non-differential signal output state, but a common driver can be used in those states. The drive circuit 300 of the fourth embodiment differs from the first embodiment in that a common driver is used in each operating state.

FIG. 10 is a circuit diagram showing one configuration example of the drive circuit 300 according to the fourth embodiment of the present technology. The driving circuit 300 of the fourth embodiment differs from the first embodiment in that an output voltage control section 341, switches 353 to 356, and shared drivers 351 and 352 are arranged in the driving section 305. different.

The output voltage control section 341 controls the DC output voltages of the shared drivers 351 and 352 according to the control signal DIF. This output voltage control section 341 lowers the output voltage in the differential signal output state than in the non-differential signal output state.

The shared driver 351 supplies a differential signal (such as a positive phase signal) or a non-differential signal from the serializer 240 to one end of the coil 361 . Shared driver 352 supplies a differential signal (such as an anti-phase signal) or a non-differential signal from serializer 240 to one end of coil 362 .

The switch 353 opens and closes the path between the signal line 241 on the input side and the input terminal of the shared driver 351 according to the control signal SC. The switch 352 opens and closes the path between the signal line 242 on the input side and the input terminal of the shared driver 351 according to the control signal DIF. The switch 353 opens and closes the path between the signal line 243 on the input side and the input terminal of the shared driver 352 according to the control signal DIF. The switch 354 opens and closes the path between the signal line 244 on the input side and the input terminal of the common driver 352 according to the control signal SC.

When transmitting in a non-differential signal output state, the logic circuit 230 closes the switches 353 and 356 with the control signal SC and opens the switches 354 and 355 with the control signal DIF. In addition, the logic circuit 230 closes the switches 354 and 355 by the control signal DIF and opens the switches 353 and 356 by the control signal SC when transmitting in the differential signal output state.

By using shared drivers 351 and 352 in common in each operating state, the number of drivers can be reduced compared to the first embodiment.

In this way, according to the fourth embodiment of the present technology, since the shared drivers 351 and 352 are commonly used in each operating state, the number of drivers can be reduced compared to the case where different drivers are used in each operating state. can be done.

<5. Fifth Embodiment>
In the first embodiment described above, the driving section 305 and the transformer 360 are arranged on the circuit chip 202, but with this configuration, it is difficult to further reduce the circuit scale of the circuit chip 202. FIG. The drive circuit 300 of the fifth embodiment differs from the first embodiment in that the transformer 360 is arranged outside the circuit chip 202 .

FIG. 11 is a circuit diagram showing one configuration example of the drive circuit 300 according to the fifth embodiment of the present technology. The drive circuit 300 of the fifth embodiment differs from the first embodiment in that the transformer 360 is arranged in the transmission line 120 outside the circuit chip 202 . Squares in the figure indicate pads. By disposing the transformer 360 outside the circuit chip 202, the circuit scale of the circuit chip 202 can be reduced. Note that the circuit chip 202 is an example of the semiconductor chip described in the claims.

Thus, according to the fifth embodiment of the present technology, since the transformer 360 is arranged outside the circuit chip 202, the circuit scale of the circuit chip 202 can be reduced.

<6. Sixth Embodiment>
In the second embodiment described above, the magnetically coupled coils 361 and 362 are used to reduce the inductance in the non-differential signal output state. However, this configuration may not be able to sufficiently reduce the influence of the output capacitance of the driver on the waveform. The drive circuit 300 of the sixth embodiment differs from the second embodiment in that the third embodiment is applied to the second embodiment.

FIG. 12 is a circuit diagram showing one configuration example of the drive circuit 300 according to the sixth embodiment of the present technology. The driving circuit 300 of the sixth embodiment differs from the second embodiment in that it further includes the ESD protection diodes 371 to 374 of the third embodiment.

By connecting the ESD protection diodes 371 to 374, the influence of the output capacitance of the driver on the waveform can be sufficiently reduced.

Although the output terminals of the non-differential drivers 310 and 320 are connected to the center tap, the connection destination is not limited to the center tap as long as it is a node between both ends of the coils 361 and 362. The same is true for the ESD protection diodes 371-374.

Thus, according to the sixth embodiment of the present technology, since the ESD protection diodes 371 to 374 are connected to the coils 361 and 362, it is possible to sufficiently reduce the influence of the output capacitance of the driver on the waveform.

<7. Seventh Embodiment>
In the third embodiment described above, different drivers are used in the differential signal output state and the non-differential signal output state, but a common driver can be used in those operating states. The drive circuit 300 of the seventh embodiment differs from the third embodiment in that the fourth embodiment is applied to the third embodiment.

FIG. 13 is a circuit diagram showing one configuration example of the drive circuit 300 according to the seventh embodiment of the present technology. In the drive circuit 300 of the seventh embodiment, the output voltage control section 341 of the fourth embodiment, the switches 353 to 356, and the shared drivers 351 and 352 are arranged in the drive section 305. It differs from the third embodiment.

By using shared drivers 351 and 352 in common in each operating state, the number of drivers can be reduced compared to the third embodiment.

As described above, according to the seventh embodiment of the present technology, since the shared drivers 351 and 352 are commonly used in each operating state, the number of drivers can be reduced compared to the case where different drivers are used in each operating state. can be done.

<8. Eighth Embodiment>
In the fourth embodiment described above, the driving section 305 and the transformer 360 are arranged on the circuit chip 202, but with this configuration, it is difficult to further reduce the circuit scale of the circuit chip 202. FIG. The drive circuit 300 of the eighth embodiment differs from the fourth embodiment in that the fifth embodiment is applied to the fourth embodiment.

FIG. 14 is a circuit diagram showing one configuration example of the drive circuit 300 according to the eighth embodiment of the present technology. The drive circuit 300 of the eighth embodiment differs from the fourth embodiment in that the transformer 360 is arranged in the transmission line 120 outside the circuit chip 202. FIG. Thereby, the circuit scale of the circuit chip 202 can be reduced.

Thus, according to the eighth embodiment of the present technology, since the transformer 360 is arranged outside the circuit chip 202, the circuit scale of the circuit chip 202 can be reduced.

<9. Ninth Embodiment>
In the first embodiment described above, the drive circuit 300 outputs signals to the two signal lines 121 and 122, but it is also possible to output the signals to three lines. The drive circuit 300 of the ninth embodiment differs from the first embodiment in that it outputs signals to three lines.

FIG. 15 is a circuit diagram showing one configuration example of the drive circuit 300 according to the ninth embodiment of the present technology. The drive circuit 300 of the ninth embodiment differs from the first embodiment in that it further includes a non-differential driver 321 , a driver 333 and a coil 363 .

A driver 333 constitutes a differential driver together with drivers 331 and 332 . The output voltage of the non-differential driver 321 is higher than the differential driver. The driver 333 and the non-differential driver 321 supply Dq forming a differential signal or Dsc3 forming a non-differential signal to one end of the coil 363 .

The coil 363 is magnetically coupled with the coil 362 and the other end is connected to the receiving section 130 via the signal line 123 . Also, the inductance of the coil 363 is substantially the same as that of the coil 362 , and the winding direction of the coil 363 from the driver 333 to the signal line 123 is different from the winding direction of the coil 362 from the driver 332 to the signal line 122 .

The logic circuit 230 drives the drivers 331 to 333 with the control signal DIF and stops the non-differential drivers 310, 320, 321 with the control signal SC when transmitting in the differential signal output state.

In addition, the logic circuit 230 stops the drivers 331 to 333 with the control signal DIF and drives the non-differential drivers 310, 320, 321 with the control signal SC when transmitting in the non-differential signal output state.

Although the drive circuit 300 transmits signals via three lines, it is also possible to transmit signals via four or more lines. Moreover, each of the second to eighth embodiments can be applied to the ninth embodiment.

Thus, according to the ninth embodiment of the present technology, since the non-differential driver 321, the driver 333, and the coil 363 are further provided, signals can be transmitted through three lines.

<10. Example of application to moving objects>
The technology (the present technology) according to the present disclosure can be applied to various products. For example, the technology according to the present disclosure can be realized as a device mounted on any type of moving body such as automobiles, electric vehicles, hybrid electric vehicles, motorcycles, bicycles, personal mobility, airplanes, drones, ships, and robots. may

FIG. 16 is a block diagram showing a schematic configuration example of a vehicle control system, which is an example of a mobile control system to which the technology according to the present disclosure can be applied.

A vehicle control system 12000 includes a plurality of electronic control units connected via a communication network 12001. In the example shown in FIG. 16, the vehicle control system 12000 includes a drive system control unit 12010, a body system control unit 12020, an exterior information detection unit 12030, an interior information detection unit 12040, and an integrated control unit 12050. Also, as the functional configuration of the integrated control unit 12050, a microcomputer 12051, an audio/image output unit 12052, and an in-vehicle network I/F (interface) 12053 are illustrated.

The drive system control unit 12010 controls the operation of devices related to the drive system of the vehicle according to various programs. For example, the driving system control unit 12010 includes a driving force generator for generating driving force of the vehicle such as an internal combustion engine or a driving motor, a driving force transmission mechanism for transmitting the driving force to the wheels, and a steering angle of the vehicle. It functions as a control device such as a steering mechanism to adjust and a brake device to generate braking force of the vehicle.

The body system control unit 12020 controls the operation of various devices equipped on the vehicle body according to various programs. For example, the body system control unit 12020 functions as a keyless entry system, a smart key system, a power window device, or a control device for various lamps such as headlamps, back lamps, brake lamps, winkers or fog lamps. In this case, the body system control unit 12020 can receive radio waves transmitted from a portable device that substitutes for a key or signals from various switches. The body system control unit 12020 receives the input of these radio waves or signals and controls the door lock device, power window device, lamps, etc. of the vehicle.

The vehicle exterior information detection unit 12030 detects information outside the vehicle in which the vehicle control system 12000 is installed. For example, the vehicle exterior information detection unit 12030 is connected with an imaging section 12031 . The vehicle exterior information detection unit 12030 causes the imaging unit 12031 to capture an image of the exterior of the vehicle, and receives the captured image. The vehicle exterior information detection unit 12030 may perform object detection processing or distance detection processing such as people, vehicles, obstacles, signs, or characters on the road surface based on the received image.

The imaging unit 12031 is an optical sensor that receives light and outputs an electrical signal according to the amount of received light. The imaging unit 12031 can output the electric signal as an image, and can also output it as distance measurement information. Also, the light received by the imaging unit 12031 may be visible light or non-visible light such as infrared rays.

The in-vehicle information detection unit 12040 detects in-vehicle information. The in-vehicle information detection unit 12040 is connected to, for example, a driver state detection section 12041 that detects the state of the driver. The driver state detection unit 12041 includes, for example, a camera that captures an image of the driver, and the in-vehicle information detection unit 12040 detects the degree of fatigue or concentration of the driver based on the detection information input from the driver state detection unit 12041. It may be calculated, or it may be determined whether the driver is dozing off.

The microcomputer 12051 calculates control target values for the driving force generator, the steering mechanism, or the braking device based on the information inside and outside the vehicle acquired by the vehicle exterior information detection unit 12030 or the vehicle interior information detection unit 12040, and controls the drive system control unit. A control command can be output to 12010 . For example, the microcomputer 12051 realizes the functions of ADAS (Advanced Driver Assistance System) including collision avoidance or shock mitigation, follow-up driving based on inter-vehicle distance, vehicle speed maintenance driving, vehicle collision warning, or vehicle lane deviation warning. Cooperative control can be performed for the purpose of

In addition, the microcomputer 12051 controls the driving force generator, the steering mechanism, the braking device, etc. based on the information about the vehicle surroundings acquired by the vehicle exterior information detection unit 12030 or the vehicle interior information detection unit 12040, so that the driver's Cooperative control can be performed for the purpose of autonomous driving, etc., in which vehicles autonomously travel without depending on operation.

Also, the microcomputer 12051 can output a control command to the body system control unit 12020 based on the information outside the vehicle acquired by the information detection unit 12030 outside the vehicle. For example, the microcomputer 12051 controls the headlamps according to the position of the preceding vehicle or the oncoming vehicle detected by the vehicle exterior information detection unit 12030, and performs cooperative control aimed at anti-glare such as switching from high beam to low beam. It can be carried out.

The audio/image output unit 12052 transmits at least one of audio and/or image output signals to an output device capable of visually or audibly notifying the passengers of the vehicle or the outside of the vehicle. In the example of FIG. 16, an audio speaker 12061, a display unit 12062, and an instrument panel 12063 are illustrated as output devices. The display unit 12062 may include at least one of an on-board display and a head-up display, for example.

FIG. 17 is a diagram showing an example of the installation position of the imaging unit 12031. FIG.

In FIG. 17, the imaging unit 12031 has imaging units 12101, 12102, 12103, 12104, and 12105.

The imaging units 12101, 12102, 12103, 12104, and 12105 are provided at positions such as the front nose of the vehicle 12100, the side mirrors, the rear bumper, the back door, and the upper part of the windshield in the vehicle interior, for example. An image pickup unit 12101 provided in the front nose and an image pickup unit 12105 provided above the windshield in the passenger compartment mainly acquire images in front of the vehicle 12100 . Imaging units 12102 and 12103 provided in the side mirrors mainly acquire side images of the vehicle 12100 . An imaging unit 12104 provided in the rear bumper or back door mainly acquires an image behind the vehicle 12100 . The imaging unit 12105 provided above the windshield in the passenger compartment is mainly used for detecting preceding vehicles, pedestrians, obstacles, traffic lights, traffic signs, lanes, and the like.

Note that FIG. 17 shows an example of the imaging range of the imaging units 12101 to 12104. FIG. The imaging range 12111 indicates the imaging range of the imaging unit 12101 provided in the front nose, the imaging ranges 12112 and 12113 indicate the imaging ranges of the imaging units 12102 and 12103 provided in the side mirrors, respectively, and the imaging range 12114 The imaging range of an imaging unit 12104 provided on the rear bumper or back door is shown. For example, by superimposing the image data captured by the imaging units 12101 to 12104, a bird's-eye view image of the vehicle 12100 viewed from above can be obtained.

At least one of the imaging units 12101 to 12104 may have a function of acquiring distance information. For example, at least one of the imaging units 12101 to 12104 may be a stereo camera composed of a plurality of imaging elements, or may be an imaging element having pixels for phase difference detection.

For example, based on the distance information obtained from the imaging units 12101 to 12104, the microcomputer 12051 determines the distance to each three-dimensional object within the imaging ranges 12111 to 12114 and changes in this distance over time (relative velocity with respect to the vehicle 12100). , it is possible to extract, as the preceding vehicle, the closest three-dimensional object on the course of the vehicle 12100, which runs at a predetermined speed (for example, 0 km/h or more) in substantially the same direction as the vehicle 12100. can. Furthermore, the microcomputer 12051 can set the inter-vehicle distance to be secured in advance in front of the preceding vehicle, and perform automatic brake control (including following stop control) and automatic acceleration control (including following start control). In this way, cooperative control can be performed for the purpose of automatic driving in which the vehicle runs autonomously without relying on the operation of the driver.

For example, based on the distance information obtained from the imaging units 12101 to 12104, the microcomputer 12051 converts three-dimensional object data related to three-dimensional objects to other three-dimensional objects such as motorcycles, ordinary vehicles, large vehicles, pedestrians, and utility poles. It can be classified and extracted and used for automatic avoidance of obstacles. For example, the microcomputer 12051 distinguishes obstacles around the vehicle 12100 into those that are visible to the driver of the vehicle 12100 and those that are difficult to see. Then, the microcomputer 12051 judges the collision risk indicating the degree of danger of collision with each obstacle, and when the collision risk is equal to or higher than the set value and there is a possibility of collision, an audio speaker 12061 and a display unit 12062 are displayed. By outputting an alarm to the driver via the drive system control unit 12010 and performing forced deceleration and avoidance steering via the drive system control unit 12010, driving support for collision avoidance can be performed.

At least one of the imaging units 12101 to 12104 may be an infrared camera that detects infrared rays. For example, the microcomputer 12051 can recognize a pedestrian by determining whether or not the pedestrian exists in the captured images of the imaging units 12101 to 12104 . Such recognition of a pedestrian is performed by, for example, a procedure for extracting feature points in images captured by the imaging units 12101 to 12104 as infrared cameras, and performing pattern matching processing on a series of feature points indicating the outline of an object to determine whether or not the pedestrian is a pedestrian. This is done by a procedure that determines When the microcomputer 12051 determines that a pedestrian exists in the images captured by the imaging units 12101 to 12104 and recognizes the pedestrian, the audio image output unit 12052 outputs a rectangular outline for emphasis to the recognized pedestrian. is superimposed on the display unit 12062 . Also, the audio/image output unit 12052 may control the display unit 12062 to display an icon or the like indicating a pedestrian at a desired position.

An example of a vehicle control system to which the technology according to the present disclosure can be applied has been described above. The technology according to the present disclosure can be applied to, for example, the imaging unit 12031 among the configurations described above. Specifically, the imaging device 100 in FIG. 1 can be applied to the imaging unit 12031 . By applying the technology according to the present disclosure to the imaging unit 12031, it is possible to improve the transmission speed, reduce noise, and obtain a more viewable captured image, thereby reducing driver fatigue.

It should be noted that the above-described embodiment shows an example for embodying the present technology, and the matters in the embodiment and the matters specifying the invention in the scope of claims have corresponding relationships. Similarly, the matters specifying the invention in the scope of claims and the matters in the embodiments of the present technology with the same names have corresponding relationships. However, the present technology is not limited to the embodiments, and can be embodied by various modifications to the embodiments without departing from the scope of the present technology.

It should be noted that the effects described in this specification are only examples and are not limited, and other effects may also occur.

Note that the present technology can also have the following configuration.
(1) a transformer provided with a plurality of magnetically coupled coils;
a driver that supplies either a non-differential signal or a differential signal to the transformer;
the plurality of coils includes first and second coils that are magnetically coupled;
The drive unit is connected to one end of the first coil and one end of the second coil,
A drive circuit in which magnetic fluxes generated by the first and second coils weaken each other when a common-mode current is caused to flow into the one end of each of the first and second coils.
(2) The drive unit supplies the differential signal to one end of the first coil and one end of the second coil, and the drive unit supplies the differential signal to one end of the first coil and one end of the second coil. The drive circuit according to (1) above, which supplies the differential signal to one end of
(3) a first ESD protection diode connected to a node across the first coil;
The driving circuit according to (2), further comprising a second ESD protection diode connected to a node between both ends of the second coil.
(4) the driving unit,
a shared driver that provides one of the differential signal and the non-differential signal;
The driving circuit according to (2) or (3), further comprising an output voltage control section that controls the output voltage of the shared driver.
(5) the driving unit is arranged on a predetermined semiconductor chip;
The driving circuit according to (4), wherein the transformer is arranged outside the semiconductor chip.
(6) the driving unit,
a differential driver that supplies the differential signal;
The driving circuit according to (2), further comprising a non-differential driver that supplies the non-differential signal.
(7) The drive circuit according to (6), wherein the output terminal of the non-differential driver is connected to a node between either end of the first and second coils.
(8) The drive circuit according to (7), wherein the output terminal of the non-differential driver is connected to one end of the first and second coils.
(9) the driving unit is arranged on a predetermined semiconductor chip;
The driving circuit according to (8), wherein the transformer is arranged outside the semiconductor chip.
(10) the plurality of coils includes first, second and third coils that are magnetically coupled;
The drive unit supplies the differential signal to one end of the first coil, one end of the second coil, and one end of the third coil,
The drive circuit according to (1) above, wherein the magnetic fluxes generated by the second and third coils weaken each other when a common-mode current is caused to flow into the one end of each of the second and third coils.
(11) further comprising a receiver that receives differential signals via the first and second signal lines;
The drive unit has first and second output terminals,
the one end of the first coil is connected to the first output terminal and the other end is connected to the first signal line;
The driving circuit according to (1), wherein the one end of the second coil is connected to the second output terminal and the other end is connected to the second signal line.
(12) the first and second coils share a predetermined winding axis;
When viewed from the direction of the winding axis, the winding direction about the winding axis from one end connected to the output terminal of the wiring of the first coil to the other end connected to the signal line is 2 is opposite to the winding direction about the winding axis from one end connected to the output terminal of the wiring of the coil to the other end connected to the signal line.
The driving circuit according to (1) above.
(13) a transformer provided with a plurality of magnetically coupled coils;
a driving unit that supplies either a non-differential signal or a differential signal to the transformer according to a predetermined control signal;
a logic circuit that designates either the non-differential signal or the differential signal according to the control signal and supplies the signal to the drive unit;
the plurality of coils includes first and second coils that are magnetically coupled;
The drive unit is connected to one end of the first coil and one end of the second coil,
A solid-state imaging device in which magnetic fluxes generated by the first and second coils weaken each other when a common-mode current is caused to flow into the one end of each of the first and second coils.

REFERENCE SIGNS LIST 100 Imaging Device 110 Mounting Board 120 Transmission Line 130 Receiving Section 200 Solid-State Imaging Device 201 Pixel Chip 202 Circuit Chip 210 Pixel 220 Analog-to-Digital Conversion Section 230 Logic Circuit 240 Serializer 300 Driving Circuit 305 Driving Section 310, 320, 321 Non-Differential Driver 311 Inverter 312-315, 353-356 Switch 316 pMOS transistor 317 nMOS transistor 330 Differential driver 331-333 Driver 341 Output voltage controller 351, 352 Shared driver 360 Transformer 361-363 Coil 371-374 ESD protection diode 12031 Imaging unit

Claims (13)

1. a transformer provided with a plurality of magnetically coupled coils;
   a driver that supplies either a non-differential signal or a differential signal to the transformer;
   the plurality of coils includes first and second coils that are magnetically coupled;
   The drive unit is connected to one end of the first coil and one end of the second coil,
   A drive circuit in which magnetic fluxes generated by the first and second coils weaken each other when a common-mode current is caused to flow into the one end of each of the first and second coils.
2. The drive unit supplies the differential signal to one end of the first coil and one end of the second coil, and the differential signal is output from the other ends of the first and second coils. 2. A drive circuit according to claim 1.
3. a first ESD protection diode connected to a node across the first coil;
   2. The drive circuit of claim 1, further comprising a second ESD protection diode connected to a node across said second coil.
4. The drive unit
   a shared driver that provides one of the differential signal and the non-differential signal;
   2. The driving circuit according to claim 1, further comprising an output voltage control section for controlling an output voltage of said shared driver.
5. The driving unit is arranged on a predetermined semiconductor chip,
   5. The driving circuit according to claim 4, wherein said transformer is arranged outside said semiconductor chip.
6. The drive unit
   a differential driver that supplies the differential signal;
   2. The drive circuit of claim 1, further comprising a non-differential driver for supplying said non-differential signal.
7. 7. The drive circuit according to claim 6, wherein the output terminal of said non-differential driver is connected to a node between either end of said first and second coils.
8. 8. The drive circuit according to claim 7, wherein the output terminal of said non-differential driver is connected to said one end of either said first or second coil.
9. The driving unit is arranged on a predetermined semiconductor chip,
   9. The drive circuit according to claim 8, wherein said transformer is arranged outside said semiconductor chip.
10. the plurality of coils includes first, second and third coils that are magnetically coupled;
    The drive unit supplies the differential signal to one end of the first coil, one end of the second coil, and one end of the third coil,
    2. The drive circuit according to claim 1, wherein when a common-mode current is caused to flow into said one end of each of said second and third coils, the magnetic fluxes generated by said second and third coils weaken each other.
11. further comprising a receiving unit that receives differential signals via the first and second signal lines;
    The drive unit has first and second output terminals,
    the one end of the first coil is connected to the first output terminal and the other end is connected to the first signal line;
    2. The drive circuit according to claim 1, wherein said one end of said second coil is connected to said second output terminal, and the other end is connected to said second signal line.
12. the first and second coils share a predetermined winding axis;
    When viewed from the direction of the winding axis, the winding direction about the winding axis from one end connected to the output terminal of the wiring of the first coil to the other end connected to the signal line is 2. The drive circuit according to claim 1, wherein the winding direction about the winding axis from one end connected to the output terminal of the wiring of the second coil to the other end connected to the signal line is opposite to the winding direction.
13. a transformer provided with a plurality of magnetically coupled coils;
    a driving unit that supplies either a non-differential signal or a differential signal to the transformer according to a predetermined control signal;
    a logic circuit that designates either the non-differential signal or the differential signal according to the control signal and supplies the signal to the drive unit;
    the plurality of coils includes first and second coils that are magnetically coupled;
    The drive unit is connected to one end of the first coil and one end of the second coil,
    A solid-state imaging device in which magnetic fluxes generated by the first and second coils weaken each other when a common-mode current is caused to flow into the one end of each of the first and second coils.

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