DRIVING CIRCUIT

• US 20200135244A1
• Filed: 07/16/2019
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Active Grant

• Current Assignee: Realtek Semiconductor Corp.
• Original Assignee: Realtek Semiconductor Corp.
• Inventors: CHANG, Chia-Ling, TANG, Wei-Cheng, KAO, Li-Lung, LIN, Che-Hung
• Granted Patent: US 11,004,486 B2
• Time in Patent Office: Days
• CPC Class Codes: G11C 7/1051 Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
• CPC Class Codes: G11C 7/1078 Data input circuits, e.g. write amplifiers, data input buffers, data input registers, data input level conversion circuits
• CPC Class Codes: H03K 19/017509 Interface arrangements
• CPC Class Codes: H03K 19/018521 of complementary type, e.g. CMOS
• CPC Class Codes: H03K 5/04 by increasing duration; by decreasing duration
• CPC Class Codes: H03K 5/1534 Transition or edge detectors

Abstract

The present disclosure relates to a driving circuit including a first circuit, a transistor switch, and a voltage level conversion circuit. The first circuit includes an operational amplifier and a feedback circuit, and is configured to output a first signal (e.g., an analog signal). The feedback circuit is configured to feed back the first signal to the operational amplifier. A source terminal and a drain terminal of the transistor switch are respectively electrically coupled to the operational amplifier and an output pin of the driving circuit. The voltage level conversion circuit is connected to the source terminal and a gate terminal of the transistor switch. When the voltage level conversion circuit is enabled, a voltage difference between the gate terminal and the source terminal of the transistor switch is controlled to a set value, so that the first signal is output to the output pin through the transistor switch.

Claims

1. A driving circuit, comprising:

a first analog circuit, an output terminal of the first analog circuit configured to output a first analog signal;

a digital circuit configured to output a digital signal;

a first transistor switch comprising a source terminal, a gate terminal, and a drain terminal, wherein the source terminal of the first transistor switch is electrically coupled to the output terminal of the first analog circuit, and the drain terminal of the first transistor switch is electrically coupled to an output pin of the driving circuit; and

a first voltage level conversion circuit electrically coupled between the source terminal of the first transistor switch and the gate terminal of the first transistor switch, wherein when the first voltage level conversion circuit is enabled, the first voltage level conversion circuit is configured to control a voltage difference between the gate terminal and the source terminal of the first transistor switch to a set value, so that the first transistor switch is turned on, and the first analog signal is outputted to the output pin of the driving circuit through the first transistor switch, when the first voltage level conversion circuit is disabled, the first transistor switch is turned off, so that the digital signal is outputted to the output pin of the driving circuit.

2. The driving circuit of claim 1, further comprising:

a first switch electrically coupled between the gate terminal of the first transistor switch and a reference electric potential, wherein when the first voltage level conversion circuit is disabled, the first switch is turned on, so that the gate terminal of the first transistor switch is turned off through the reference electric potential.

3. The driving circuit of claim 1, wherein the first analog circuit further comprises:

a first operational amplifier, an output terminal of the first operational amplifier configured to output the first analog signal; and

a first feedback circuit electrically coupled between an input terminal of the first operational amplifier and the output terminal of the first operational amplifier so as to feedback the first analog signal to the input terminal of the first operational amplifier.

4. The driving circuit of claim 1, wherein the first analog circuit further comprises:

a first operational amplifier, an output terminal of the first operational amplifier configured to output the first analog signal; and

a first feedback circuit, wherein a first terminal of the first feedback circuit is electrically coupled to an input terminal of the first operational amplifier, a second terminal of the first feedback circuit is electrically coupled to the drain terminal of the first transistor switch, so that the first transistor switch is electrically coupled between the output terminal of the first operational amplifier and the second terminal of the first feedback circuit.

5. The driving circuit of claim 1, further comprising:

a second analog circuit, an output terminal of the second analog circuit configured to output a second analog signal;

a second transistor switch comprising a source terminal, a gate terminal and a drain terminal, wherein the source terminal of the second transistor switch is electrically coupled to the output terminal of the second analog circuit, the drain terminal of the second transistor switch is electrically coupled to the output pin of the driving circuit; and

a second voltage level conversion circuit electrically coupled between the source terminal of the second transistor switch and gate terminal of the second transistor switch, wherein when the second voltage level conversion circuit is enabled, the second voltage level conversion circuit is configured to control a voltage difference between the gate terminal and the source terminal of the second transistor switch to another set value, so that the second transistor switch is turned on, and the second analog signal is outputted to the output pin of the driving circuit through the second transistor switch.

6. A driving circuit, comprising:

a first circuit comprising an operational amplifier and a feedback circuit, wherein an output terminal of the operational amplifier is configured to output a first signal;

the feedback circuit is electrically coupled between an input terminal of the operational amplifier and the output terminal of the operational amplifier to configured to feedback the first signal to the input terminal of the operational amplifier;

a transistor switch comprising a source terminal, a gate terminal and a drain terminal, wherein the source terminal of the transistor switch is electrically coupled to the output terminal of the operational amplifier, the drain terminal of the transistor switch is electrically coupled to an output pin of the driving circuit; and

a voltage level conversion circuit electrically coupled between the source terminal of the transistor switch and the gate terminal of the transistor switch, wherein when the voltage level conversion circuit is enabled, the voltage level conversion circuit is configured to control a voltage difference between the gate terminal and the source terminal of the transistor switch to a set value, so that the transistor switch is turned on, and the first signal is outputted to the output pin of the driving circuit through the transistor switch.

7. The driving circuit of claim 6, wherein a first terminal of the feedback circuit is electrically coupled to the input terminal of the operational amplifier, a second terminal of the feedback circuit is electrically coupled to the drain terminal of the transistor switch, so that the transistor switch is electrically coupled between the output terminal of the operational amplifier and the second terminal of the feedback circuit.

8. The driving circuit of claim 6, further comprising:

a first switch electrically coupled between the gate terminal of the transistor switch and a reference electric potential, wherein when the voltage level conversion circuit is disabled, the first switch is turned on, so that the gate terminal of the transistor switch is turned off through the reference electric potential.

9. The driving circuit of claim 6, further comprising:

a second circuit electrically coupled to the output pin of the driving circuit through a second switch, wherein when the voltage level conversion circuit is disabled, the transistor switch is turned off, and the second circuit outputs a second signal to the output pin of the driving circuit.

10. The driving circuit of claim 9, wherein the first circuit comprises an analog circuit, and the second circuit comprises a digital circuit.