CN114825870A - Delay detection circuit of DTOF drive circuit and drive circuit - Google Patents
Delay detection circuit of DTOF drive circuit and drive circuit Download PDFInfo
- Publication number
- CN114825870A CN114825870A CN202210568372.9A CN202210568372A CN114825870A CN 114825870 A CN114825870 A CN 114825870A CN 202210568372 A CN202210568372 A CN 202210568372A CN 114825870 A CN114825870 A CN 114825870A
- Authority
- CN
- China
- Prior art keywords
- delay
- unit
- signal
- dtof
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
Abstract
The invention provides a delay detection circuit of a DTOF drive circuit and the DTOF drive circuit, wherein the delay detection circuit is used for detecting the target delay of the DTOF drive circuit and comprises a first feedforward module, a second feedforward module, a feedback module and a delay control module; the first feedforward module receives a detection input signal and generates a first delay feedback signal; the second feedforward module outputs a delay compensation signal; the feedback module outputs a second delay feedback signal; the time delay from the detection input signal to the time delay compensation signal is recorded as compensation time delay; the time delay from the detection input signal to the second time delay feedback signal is recorded as feedback time delay; the delay difference between the feedback delay and the compensation delay is equal to the target delay; the first feedforward module adjusts the self delay time under the delay control signal generated by the delay control module, so that the delay difference value is equal to the reference delay.
Description
Technical Field
The invention relates to the field of driving circuits, in particular to a delay detection circuit of a DTOF driving circuit and the driving circuit.
Background
DTOF systems measure distance based on the delay time between the transmission of an optical signal and the reception of the optical signal. In the DTOF driving system, it is required that the delay time from the input of the control signal to the output of the optical signal is stable and does not vary with the power supply voltage, temperature, and process, and therefore, it is necessary to implement delay control in the DTOF driving system.
When performing delay control of the DTOF drive system, it is necessary to detect a time delay from an input signal to a drive output signal in a chip. A common method in practice is to perform closed-loop control on the delay time, and compare the actually detected delay time with a reference time. Because the self delay time of the signal input module is difficult to directly obtain in a chip, if the part of the delay time is not contained in the delay control, a larger system error can be caused; in addition, while detecting the driving output signal, the delay time introduced by the detection circuit also introduces a systematic error to the delay control, so how to accurately detect the delay time of the driving system is one of the key problems of the DTOF system.
Disclosure of Invention
The invention provides a delay detection circuit of a DTOF drive circuit and the DTOF drive circuit, which are used for solving the problem that the delay time of a system is difficult to accurately detect in the DTOF drive circuit.
According to a first aspect of the present invention, there is provided a delay detection circuit of a DTOF driving circuit, for detecting a target delay of the DTOF driving circuit, wherein the DTOF driving circuit is configured to output an output signal to drive a laser diode, the delay detection circuit comprising: the system comprises a first feedforward module, a second feedforward module, a feedback module and a time delay control module; wherein:
the first feedforward module is used for receiving a detection input signal and generating a first delay feedback signal;
the first feedforward module comprises a first input differential signal detection unit and a delay adjustment unit; the input end of the first input differential signal detection unit receives the detection input signal, and the output end of the first input differential signal detection unit outputs the first delay feedback signal; the first delay feedback signal is input to the DTOF driving circuit after passing through the delay adjusting unit and the DTOF driving circuit generates the output signal;
the second feedforward module comprises a delay unit, and the input end of the delay unit is connected with the output end of the first input differential signal detection unit so as to receive the first delay feedback signal; the output end of the delay unit outputs a delay compensation signal; the time delay from the detection input signal to the time delay compensation signal is recorded as compensation time delay;
the input end of the feedback module receives an output signal output by the DTOF drive circuit, and the output end of the feedback module outputs a second delay feedback signal; the time delay from the detection input signal to the second time delay feedback signal is recorded as feedback time delay;
the delay control module is used for generating a delay control signal according to a delay difference value between the feedback delay and the compensation delay and a reference delay; the delay adjusting unit is used for adjusting the delay time of the delay adjusting unit under the delay control signal so as to enable the delay difference value to be equal to the reference delay; wherein a delay difference between the feedback delay and the compensation delay is equal to the target delay; the target delay characterizes a circuit delay from the probing input signal to the output signal.
Optionally, the feedback module includes a second input differential signal detection unit and an inverter; a first input end and a second input end of the second input differential signal detection unit respectively receive the output signal and an inverted output signal output by the inverter; and the output end of the second input differential signal detection unit outputs a second delay feedback signal.
Optionally, the delay control module includes a trigger unit and a delay control unit; a first input end of the trigger unit is connected with an output end of the second feedforward module and used for receiving the delay compensation signal, a second input end of the trigger unit is connected with an output end of the feedback module and used for receiving the second delay feedback signal, and an output end of the trigger unit is connected with the delay control unit so as to output a difference signal representing the delay difference to the delay control unit;
a first input end of the delay control unit receives the delay difference value, and a second input end of the delay control unit receives the reference delay; the output end of the delay control unit is connected with the delay adjusting unit; the delay control unit is used for comparing the difference signal with the reference delay and outputting a delay control signal to the delay adjusting unit.
Optionally, the trigger unit includes an RS trigger; the S end of the RS trigger is connected with the output end of the second feedforward module so as to receive the delay compensation signal; the R end of the RS trigger is connected with the output end of the feedback module to receive the second delay feedback signal; and the output end of the RS trigger is connected with the delay control unit to output the delay difference value.
Optionally, the circuit delay of the delay unit in the second feedforward module is the same as the circuit delay of the inverter.
Optionally, the feedback module further includes a first level shift unit and a second level shift unit;
the input end of the first level transfer unit is connected with the output end of the phase inverter; the output end of the first level shift unit is connected with the first input end of the second input differential signal detection unit;
the input end of the second level transfer unit is connected with the output end of the DTOF drive circuit and receives the output signal output by the DTOF drive circuit; and the output end of the second level shift unit is connected with the second input end of the second input differential signal detection unit.
Optionally, the second feed-forward module includes a third level shift unit;
the input end of the third level shift unit is connected with the output end of the first input differential signal detection unit; and the output end of the third level transfer unit is connected with the time delay unit.
Optionally, the circuit delays of the first level shift unit, the second level shift unit, and the third level shift unit are the same.
Optionally, the feed-forward module further includes a fourth level shift unit; the input end of the fourth level transfer unit is connected with the output end of the delay adjusting unit; and the output end of the fourth level transfer unit is connected with the DTOF driving circuit.
Optionally, the DTOF driving circuit includes a driving amplifying unit and a switching tube; the input end of the driving amplification unit is connected with the output end of the feedforward module; the output end of the driving amplification unit is connected with the control end of the switch tube; the first end of the switching tube is connected with the laser diode; the second end of the switching tube is grounded or connected with a power supply.
Optionally, the switching tube is a MOSFET.
According to a second aspect of the present invention, a DTOF driving circuit with closed-loop delay control is provided, which includes the delay detection circuit of the DTOF driving circuit according to the first aspect of the present invention and the DTOF driving circuit.
The delay detection circuit of the DTOF drive circuit and the DTOF drive circuit are provided by the invention, the delay detection circuit is used for detecting the target delay of the DTOF drive circuit, and the target delay represents the circuit delay from the detection input signal to the output signal; the delay detection circuit obtains compensation delay according to a first delay feedback signal generated by the first feedforward module and a delay compensation signal generated by the second feedforward module; obtaining the feedback delay according to a second delay feedback signal output by the feedback module; the delay control module generates a delay control signal according to a delay difference value between the feedback delay and the compensation delay and a reference delay; and the delay adjusting unit in the first feedforward module adjusts the delay time of the delay adjusting unit under the delay control signal so as to enable the delay difference to be equal to the reference delay.
The delay detection circuit of the DTOF driving circuit provided by the invention enables the delay difference between the feedback delay and the compensation delay to be equal to the target delay through the delay compensation circuit in the second feedforward module, and adjusts the delay difference to be the same as the reference delay through the delay adjusting unit, thereby realizing the control of the target delay.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a delay detection circuit of a conventional DTOF driving circuit with closed-loop control;
fig. 2 is a schematic circuit configuration diagram of a delay detection circuit of the DTOF drive circuit provided in an exemplary embodiment;
fig. 3 is a schematic circuit configuration diagram of a delay detection circuit of the DTOF drive circuit provided in another exemplary embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
DTOF, i.e. Direct TOF, directly measures the time of flight, i.e. measures the time interval between the transmitted pulse and the received pulse, and when performing delay control of the DTOF driving system, it is necessary to detect the time delay from the input signal to the driving output signal in the chip. A common method in practice is to perform closed-loop control on the delay time, and compare the actually detected delay time with a reference time. As shown in fig. 1, a common closed-loop control circuit compares the delay time difference between the output signal X1 of the feedforward module and the output signal X3 of the feedback circuit with a reference time, but since the detection point X1 of the feedforward module is input to the differential signal detection unit LVDS circuit, the circuit delay time of the LVDS itself is not included in the detected delay time; in the feedback branch, the delay time of the circuit for detecting the driving output voltage is included in the detected delay time. The delay time thus detected and the actual delay will have errors. In order to eliminate the error, the delay detection circuit of the DTOF driving circuit provided by the invention is based on the principle of error cancellation, and the delay difference between the feedback delay and the compensation delay is equal to the target delay through the compensation circuits in the second feedforward module and the feedback module, and the delay difference is adjusted to be the same as the reference delay through the delay adjusting unit, so that the control on the target delay is realized more accurately.
Fig. 2 is a delay detection circuit of a DTOF driving circuit according to an embodiment of the present invention, configured to detect a target delay tdly _ target of the DTOF driving circuit, where the DTOF driving circuit is configured to output an output signal to drive a laser diode, and the delay detection circuit includes: a first feedforward module 10, a second feedforward module 20, a feedback module 30 and a delay control module 40; wherein:
the first feed-forward module 10 is configured to receive a detection input signal and generate a first delayed feedback signal X1;
the first feed-forward module 10 includes a first input differential signal detection unit 11 and a delay adjustment unit 12; the input end of the first input differential signal detection unit 11 receives the detection input signal, and the output end of the first input differential signal detection unit 11 outputs the first delayed feedback signal X1; the first delayed feedback signal X1 passes through the delay adjustment unit 12 and then is input to the DTOF driving circuit, and the DTOF driving circuit generates the output signal X2;
the detection input signal is a group of differential signals DATA/XDATA; the first input differential signal detection unit is a low-voltage differential signal detection circuit LVDS, which converts a set of differential input signals DATA/XDATA into single-ended digital signals, i.e. a first delayed feedback signal X1;
the second feed-forward module 20 comprises a delay unit 21, an input end of the delay unit is connected to an output end of the first input differential signal detection unit 11 to receive the first delayed feedback signal X1; the output end of the delay unit 21 outputs a delay compensation signal X1 a; the time delay from the detection input signal DATA/XDATA to the delay compensation signal X1a is denoted as the compensation delay tdly _ X1 a;
the input end of the feedback module 30 receives the output signal X2 output by the DTOF driving circuit, and the output end thereof outputs a second delayed feedback signal X3 a; the time delay from the detection input signal to the second time delayed feedback signal X3a is denoted as feedback time delay tdly _ X3 a;
in one embodiment, the feedback module 30 includes a second input differential signal detection unit 31 and an inverter 32; the first input terminal and the second input terminal of the second input differential signal detection unit 31 respectively receive the output signal X2 and the inverted output signal X3 output by the inverter 32; the output terminal of the second input differential signal detection unit 31 outputs a second delayed feedback signal X3 a.
The delay control module 40 is configured to generate a delay control signal dly _ ctrl according to a delay difference tdly _ det between the feedback delay tdly _ X3a and the compensation delay tdly _ X1a and a reference delay Time _ Ref; the delay adjusting unit 12 is configured to adjust its own delay Time under the delay control signal dly _ ctrl, so that the delay difference tdly _ det is equal to the reference delay Time _ Ref; wherein a delay difference between the feedback delay tdly _ X3a and the compensation delay tdly _ X1a is equal to the target delay tdly _ target; the target time delay tdly _ target characterizes the circuit time delay from the probing input signal to the output signal.
In one embodiment, the delay control module 40 includes a trigger unit 41 and a delay control unit 42; a first input end of the flip-flop unit 40 is connected to the output end of the second feedforward module 20 and is configured to receive the delay compensation signal X1a, a second input end of the flip-flop unit 41 is connected to the output end of the feedback module 30 and is configured to receive the second delay feedback signal X3a, and an output end of the flip-flop unit 41 is connected to the delay control unit 42 and is configured to output the delay difference tdly _ det to the delay control unit 42; wherein tdly _ det is tdly _ X3a-tdly _ X1 a;
in one embodiment, the trigger unit 41 includes an RS trigger; the S terminal of the RS flip-flop is connected to the output terminal of the second feed-forward module 20 to receive the delay compensation signal X1 a; the R end of the RS flip-flop is connected to the output end of the feedback module 30 to receive the second delayed feedback signal X3 a; the output end of the RS flip-flop is connected to the delay control unit 12 to output a difference signal dly _ det representing the delay difference tdly _ det. The RS flip-flop compares the delay between X1a and X3a and generates said difference signal dly _ det, said output signal dly _ det being a pulse signal having a pulse width equal to said delay difference tdly _ det.
Of course, it should be appreciated that the RS flip-flop is only an example of the present invention, and the flip-flop unit of the present invention is not limited to the RS flip-flop, and any circuit that performs time domain comparison between two signals may be used, such as a Phase Frequency Detector (PFD).
A first input end of the delay control unit 42 receives the delay difference, and a second input end of the delay control unit 42 receives the reference delay Time _ Ref; the output end of the delay control unit 42 is connected with the delay unit 21; the delay control unit 42 is configured to compare the delay difference tdly _ det with the reference delay Time _ Ref, and output a delay control signal dly _ ctrl to the delay adjusting unit 12. The delay control signal dly _ ctrl is used to control the delay adjusting unit 12, and the delay adjusting unit adjusts its own delay so that the pulse width of the output signal dly _ det representing the delay difference tdly _ det is equal to the reference delay Time _ Ref, thereby implementing closed-loop control of the delay difference between the feedback delay tdly _ X3a and the compensation delay tdly _ X1 a.
In one embodiment, the circuit delay of the delay unit 21 in the second feedforward block is the same as the circuit delay of the inverter 32. Thus, the second feedforward module 20 can output the delay compensation signal X1a to compensate the circuit delay caused by the inverter 32 in the feedback module 30, so that the delay difference tdly _ det between the feedback delay tdly _ X3a and the compensation delay tdly _ X1a can be more accurately equal to the target delay tdly _ target.
The delay detection circuit of the DTOF driving circuit provided by the invention is based on the principle of error cancellation, the second feedforward module 20 is added, the influence of the corresponding circuit on the feedback branch is cancelled through the delay compensation circuit in the second feedforward module 20, the delay compensation signal is output, in addition, an input differential signal detection unit LVDS is added in the feedback module 30 to cancel the circuit delay of the LVDS in the feedforward module 20, the delay difference between the feedback delay and the compensation delay is equal to the target delay through the compensation circuits in the second feedforward module and the feedback module, and the delay difference is adjusted to be the same as the reference delay through the delay adjustment unit, so that the control of the target delay is realized, and more accurate driving delay is obtained.
In one embodiment, the feedback module 30 further includes a first level shift unit 33 and a second level shift unit 34; an input end of the first level shift unit 33 is connected to an output end of the inverter 32; the output end of the first level shift unit 33 is connected to the first input end of the second input differential signal detection unit 31; the input end of the second level shift unit 34 is connected to the output end of the DTOF driving circuit, and receives the output signal output by the DTOF driving circuit; an output terminal of the second level shifter unit 34 is connected to a second input terminal of the second input differential signal detection unit 31. The second feed-forward module comprises a third level-shifting unit 22; the input end of the third level shift unit 22 is connected to the output end of the first input differential signal detection unit 11; the output end of the third level shifter unit 22 is connected to the delay unit 21.
The circuit delays of the first level shift unit 33, the second level shift unit 34, and the third level shift unit 22 are the same.
In one embodiment, the feed-forward module 10 further includes a fourth level shift unit 13; the input end of the fourth level shifter 13 is connected to the output end of the delay adjuster 12; the output end of the fourth level shift unit 13 is connected to the DTOF driving circuit.
In one embodiment, as shown in fig. 3, the DTOF driving circuit includes a driving amplifying unit 51 and a switching tube 52; the input end of the driving amplification unit is connected with the output end of the feedforward module; the output end of the driving amplification unit is connected with the control end of the switch tube; the first end of the switching tube is connected with the laser diode; the second end of the switch tube is grounded or connected with a power supply. The switch tube is an MOSFET.
Of course, it should be appreciated that the switch of the present invention is not limited to MOSFETs, bipolar transistors or other types of switches within the scope of the present invention.
The invention also provides a DTOF drive circuit with closed-loop delay control, which comprises the delay detection circuit of the DTOF drive circuit and the DTOF drive circuit.
To illustrate the detection of the target delay time tdly _ target of the DTOF driving circuit, the circuit delay of each unit in each module is denoted by tdly (unit number), and the circuit delay of the first input differential signal detection unit 11 is denoted by tdly (11).
Said target time delay tdly _ target characterizes the circuit time delay from said probing input signal to said output signal, i.e. from the input signal DATA/XDATA to the output signal X2, and may be expressed as:
tdly_target＝tdly(11)+tdly(12)+tdly(13)+tdly(51)+tdly(52)
the delay detection circuit of the DTOF driving circuit using the delay matching closed-loop control proposed by the present invention actually controls the delay difference between the feedback delay tdly _ X3a and the compensation delay tdly _ X1a,
the compensation delay tdly _ X1a is the delay from the probing input signal DATA/XDATA to the delay compensation signal X1a, and tdly _ X1a can be expressed as:
tdly_X1a＝tdly(11)+tdly(21)+tdly(22)
the feedback delay tdly _ X3a is the delay between the detection input signal DATA/XDATA and the second delayed feedback signal X3a, i.e. from the detection input signal DATA/XDATA to the output signal X2 to the second delayed feedback signal X3a, tdly _ X3a can be expressed as:
tdly_X3a＝tdly_target+tdly(31)+tdly(32)+tdly(33)
since the circuit delay of the delay unit 21 in the second feedforward module is the same as the circuit delay of the inverter 32, i.e., tdly (21) ═ tdly (32); the first level shift unit 33 and the third level shift unit 22 have the same circuit delay, i.e., tdly (22) ═ tdly (33); the first input differential signal detection unit 11 and the second input differential signal detection unit 31 have the same circuit delay, that is, dly (31) is tdly (11).
Therefore, the delay difference tdly _ det is tdly _ X3a-tdly _ X1a is tdly _ target, i.e., the delay difference tdly _ det between the feedback delay tdly _ X3a and the compensation delay tdly _ X1a is equal to the target delay tdly _ target. In the scheme of the delay matching provided by the invention, the delay difference value tdly _ det is controlled to be the same as the Time reference Time _ Ref through closed-loop control, so that the target delay can be controlled.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A delay detection circuit of a DTOF driving circuit, which is used for detecting a target delay of the DTOF driving circuit, wherein the DTOF driving circuit is used for outputting an output signal to drive a laser diode, and the delay detection circuit comprises: the system comprises a first feedforward module, a second feedforward module, a feedback module and a time delay control module; wherein:
the first feedforward module is used for receiving a detection input signal and generating a first delay feedback signal;
the first feedforward module comprises a first input differential signal detection unit and a delay adjustment unit; the input end of the first input differential signal detection unit receives the detection input signal, and the output end of the first input differential signal detection unit outputs the first delay feedback signal; the first delay feedback signal is input to the DTOF driving circuit after passing through the delay adjusting unit and the DTOF driving circuit generates the output signal;
the second feedforward module comprises a delay unit, and the input end of the delay unit is connected with the output end of the first input differential signal detection unit so as to receive the first delay feedback signal; the output end of the delay unit outputs a delay compensation signal; the time delay from the detection input signal to the time delay compensation signal is recorded as compensation time delay;
the input end of the feedback module receives an output signal output by the DTOF drive circuit, and the output end of the feedback module outputs a second delay feedback signal; the time delay from the detection input signal to the second time delay feedback signal is recorded as feedback time delay;
the delay control module is used for generating a delay control signal according to a delay difference value between the feedback delay and the compensation delay and a reference delay; the delay adjusting unit is used for adjusting the delay time of the delay adjusting unit under the delay control signal so as to enable the delay difference value to be equal to the reference delay; wherein a delay difference between the feedback delay and the compensation delay is equal to the target delay; the target delay characterizes a circuit delay from the probing input signal to the output signal.
2. The delay detection circuit of the DTOF driving circuit of claim 1, wherein the feedback module comprises a second input differential signal detection unit and an inverter; a first input end and a second input end of the second input differential signal detection unit respectively receive the output signal and an inverted output signal output by the inverter; and the output end of the second input differential signal detection unit outputs a second delay feedback signal.
3. The delay detection circuit of the DTOF driving circuit of claim 2, wherein the delay control module comprises a flip-flop unit and a delay control unit; a first input end of the trigger unit is connected with an output end of the second feedforward module and used for receiving the delay compensation signal, a second input end of the trigger unit is connected with an output end of the feedback module and used for receiving the second delay feedback signal, and an output end of the trigger unit is connected with the delay control unit so as to output a difference signal representing the delay difference to the delay control unit;
a first input end of the delay control unit receives the delay difference value, and a second input end of the delay control unit receives the reference delay; the output end of the delay control unit is connected with the delay adjusting unit; the delay control unit is used for comparing the difference signal with the reference delay and outputting a delay control signal to the delay adjusting unit.
4. The delay detection circuit of the DTOF drive circuit of claim 3, wherein the flip-flop unit comprises an RS flip-flop; the S end of the RS trigger is connected with the output end of the second feedforward module so as to receive the delay compensation signal; the R end of the RS trigger is connected with the output end of the feedback module to receive the second delay feedback signal; and the output end of the RS trigger is connected with the delay control unit to output the delay difference value.
5. The delay detection circuit of the DTOF driving circuit of claim 2, wherein the circuit delay of the delay unit in the second feedforward block is the same as the circuit delay of the inverter.
6. The delay detection circuit of the DTOF driving circuit of claim 2, wherein the feedback module further comprises a first level shift unit and a second level shift unit;
the input end of the first level transfer unit is connected with the output end of the phase inverter; the output end of the first level shift unit is connected with the first input end of the second input differential signal detection unit;
the input end of the second level transfer unit is connected with the output end of the DTOF drive circuit and receives the output signal output by the DTOF drive circuit; and the output end of the second level shift unit is connected with the second input end of the second input differential signal detection unit.
7. The delay detection circuit of the DTOF driving circuit of claim 6, wherein the second feed-forward module comprises a third level shift unit;
the input end of the third level shift unit is connected with the output end of the first input differential signal detection unit; and the output end of the third level transfer unit is connected with the time delay unit.
8. The delay detection circuit of the DTOF drive circuit of claim 7,
the circuit delays of the first level shifting unit, the second level shifting unit and the third level shifting unit are the same.
9. The delay detection circuit of the DTOF driving circuit of claim 2, wherein the feed-forward module further comprises a fourth level shift unit; the input end of the fourth level transfer unit is connected with the output end of the delay adjusting unit; and the output end of the fourth level transfer unit is connected with the DTOF driving circuit.
10. The delay detection circuit of the DTOF driving circuit according to claim 1, wherein the DTOF driving circuit comprises a driving amplification unit and a switching tube; the input end of the driving amplification unit is connected with the output end of the feedforward module; the output end of the driving amplification unit is connected with the control end of the switch tube; the first end of the switching tube is connected with the laser diode; the second end of the switch tube is grounded or connected with a power supply.
11. The delay detection circuit of the DTOF driving circuit of claim 10, wherein the switch transistor is a MOSFET.
12. A DTOF drive circuit with closed-loop delay control, comprising the DTOF drive circuit of any of claims 1-11 and a delay detection circuit of the DTOF drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210568372.9A CN114825870A (en) | 2022-05-23 | 2022-05-23 | Delay detection circuit of DTOF drive circuit and drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210568372.9A CN114825870A (en) | 2022-05-23 | 2022-05-23 | Delay detection circuit of DTOF drive circuit and drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114825870A true CN114825870A (en) | 2022-07-29 |
Family
ID=82516909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210568372.9A Pending CN114825870A (en) | 2022-05-23 | 2022-05-23 | Delay detection circuit of DTOF drive circuit and drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114825870A (en) |
-
2022
- 2022-05-23 CN CN202210568372.9A patent/CN114825870A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1806838B1 (en) | Delay controller and delay control method | |
| US7505498B2 (en) | Apparatus and method for measurement for dynamic laser signals | |
| US8237479B2 (en) | Delay line calibration mechanism and related multi-clock signal generator | |
| US20170288369A1 (en) | Dual closed loop for laser power control | |
| EP1746725B1 (en) | Signal amplifying circuit | |
| JP2011511261A5 (en) | ||
| JP2002520986A (en) | Local control for burst mode optical transmitter | |
| JP2009246484A (en) | Vernier delay circuit, time digital converter using the same, and test device | |
| US7477589B2 (en) | Calibration method for optical disk drive signal and device doing the same | |
| US11152928B2 (en) | Electronic circuit, electronic apparatus, and method | |
| JP3042608B2 (en) | Burst light receiving circuit | |
| EP1808959B1 (en) | Timing adjusting method and timing adjusting apparatus | |
| US5978124A (en) | Light emitting control apparatus and optical transmitter | |
| KR19980701298A (en) | DRIVER CIRCUIT FOR CORRECTING THE TEMPERATURE | |
| US7012444B2 (en) | Semiconductor tester | |
| CN114825870A (en) | Delay detection circuit of DTOF drive circuit and drive circuit | |
| US6525577B2 (en) | Apparatus and method for reducing skew of a high speed clock signal | |
| US20230107400A1 (en) | Edge combiners with symmetrical operation range at high speed | |
| US20090279895A1 (en) | Frequency doubler, signal generator, optical transmitter, and optical communication apparatus | |
| US7119939B2 (en) | Phase modulation circuit, test apparatus, and communication system | |
| US7068747B2 (en) | Data decision circuit using clock signal which has phase optimized with respect to phase of input data signal | |
| CN116366059B (en) | Radio frequency power synthesis circuit and method | |
| US20230141571A1 (en) | Drive apparatus and distance measurement sensor including the same | |
| KR102488870B1 (en) | Distance measuring apparatus and impulse iq signal mismatch calibration apparats | |
| JP2019052976A (en) | Array antenna device and calibration method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |