Driver circuit

TW202642492AActive Publication Date: 2026-10-16NOVATEK MICROELECTRONICS CORP
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Patent Information

Application Number
TW114115222
Authority / Receiving Office
TW · TW
Patent Type
Applications
Current Assignee / Owner
Priority Date
2025-03-31
Filing Date
2025-04-22
Publication Date
2026-10-16
Estimated Expiration
2045-04-21

Smart Images

  • Figure TWG2TA001080407_001
    Figure TWG2TA001080407_001
  • Figure TWG2TA001080407_002
    Figure TWG2TA001080407_002
  • Figure TWG2TA001080407_003
    Figure TWG2TA001080407_003
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Abstract

A driver circuit including a buffer circuit and at least one charge and discharge circuit is provided. The buffer circuit is coupled to a first resistor string and a digital-to-analog converter via a trace. The buffer circuit is configured to output an input voltage to the first resistor string via the trace. The trace is coupled between the buffer circuit and the digital-to-analog converter. The charge and discharge circuit is coupled to the buffer circuit via the trace. The charge and discharge circuit is configured to charge or discharge the trace according to a first control signal.
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Claims

1. A driver circuit, comprising: A buffer circuit, coupled to a first resistor string and a digital-to-analog converter via a trace, and used to output an input voltage to the first resistor string via the trace, wherein the trace is coupled between the buffer circuit and the digital-to-analog converter; and at least one charge / discharge circuit, coupled to the buffer circuit via the trace, and used to charge or discharge the trace according to a first control signal.

2. The driver circuit of claim 1, wherein the at least one charge / discharge circuit is configured to charge or discharge the trace according to a second control signal, wherein the second control signal is the inverted signal of the first control signal.

3. The driver circuit as claimed in claim 1, wherein the at least one charging / discharging circuit comprises: The second resistor string is coupled between the first operating voltage and the second operating voltage, and is used to output a charging voltage or a discharging voltage according to the first control signal. A switching circuit is coupled to the second resistor string and used to receive the charging voltage or the discharging voltage and output a voltage signal to the trace, wherein the voltage signal is charged by the charging voltage or discharged by the discharging voltage.

4. The driver circuit as claimed in claim 3, wherein the switching circuit is configured to output the voltage signal to the trace according to the first control signal and the second control signal, wherein the second control signal is the inverted signal of the first control signal.

5. The driver circuit as claimed in claim 3, wherein the second resistor string comprises: Multiple resistors and at least one switch are connected in series between the first operating voltage and the second operating voltage.

6. The driver circuit as claimed in claim 5, wherein the plurality of resistors are configured to generate the charging voltage and the discharging voltage according to the first operating voltage and the second operating voltage.

7. The driver circuit as claimed in claim 6, wherein when the at least one switch is turned on, the plurality of resistors output the charging voltage and the discharging voltage to the switching circuit.

8. The driver circuit as claimed in claim 5, wherein the first control signal is used to control the on state of the at least one switch.

9. The driver circuit as claimed in claim 3, wherein the switching circuit comprises: A first transistor is coupled between the first operating voltage and the output node and is used to receive the charging voltage, wherein the voltage signal is output from the output node; And a second transistor, coupled between the output node and the second operating voltage, for receiving the discharge voltage.

10. The driver circuit as claimed in claim 9, wherein the switching circuit further comprises: At least one first switch is controlled by a second control signal, wherein the at least one first switch and the first transistor are connected in series between the first operating voltage and the output node; And at least one second switch, controlled by the first control signal, wherein the at least one second switch and the second transistor are connected in series between the output node and the second operating voltage, wherein the second control signal is the inverted signal of the first control signal.

11. The driver circuit of claim 10, wherein the voltage signal is charged by the charging voltage when the at least one first switch is turned on.

12. The driver circuit of claim 10, wherein the voltage signal is discharged by the discharge voltage when the at least one second switch is turned on.

13. The driver circuit as claimed in claim 3, wherein the at least one charging / discharging circuit further comprises: A multiplexer circuit is coupled between the second resistor string and the switching circuit, and is used to receive the charging voltage or the discharging voltage from the second resistor string, and to select and output the charging voltage or the discharging voltage to the switching circuit.