CN-121996011-A - Voltage generating circuit, voltage reference circuit and operation method thereof

CN121996011ACN 121996011 ACN121996011 ACN 121996011ACN-121996011-A

Abstract

A voltage reference circuit is provided that includes a first voltage source and a second voltage source. The first voltage source is configured to generate a first voltage that monotonically decreases with an absolute temperature of the voltage reference circuit. The second voltage source is configured to generate a second voltage that monotonically increases with an absolute temperature of the voltage reference circuit. The second voltage is compensated with the first voltage to generate a reference voltage. The first voltage source includes a first temperature sensitive device and a second temperature sensitive device. The first temperature sensitive device is of a first type and the second temperature sensitive device is of a second type. These devices are arranged in a cascade structure. The first voltage obtained at the output terminal of the first voltage source is equal to the third voltage across the first temperature sensitive device plus the fourth voltage across the second temperature sensitive device. Embodiments of the present application also provide a voltage generation circuit and a method of operating a voltage reference circuit.

Inventors

ZHANG QINGHE
Xia Chuen
REN QINGLIN
PENG YONGZHOU

Assignees

台湾积体电路制造股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251231
Priority Date: 20250505

Claims (10)

1. A voltage reference circuit, comprising: A first voltage source configured to generate a first voltage that monotonically decreases with an absolute temperature of the voltage reference circuit, an A second voltage source configured to generate a second voltage that monotonically increases with the absolute temperature of the voltage reference circuit, wherein the second voltage is compensated with the first voltage to generate a reference voltage, Wherein the first voltage source comprises a first temperature sensitive device of a first type and a second temperature sensitive device of a second type arranged in a cascade structure, Wherein the first voltage obtained at the output terminal of the first voltage source is equal to a third voltage across the first temperature sensitive device plus a fourth voltage across the second temperature sensitive device.
2. The voltage reference circuit of claim 1, wherein the first type is different from the second type.
3. The voltage reference circuit of claim 2, wherein the first temperature sensitive device is an n-type first transistor and the second temperature sensitive device is a p-type second transistor.
4. The voltage reference circuit of claim 3, wherein the first temperature sensitive device and the second temperature sensitive device have a common gate terminal.
5. The voltage reference circuit of claim 4, wherein, The first transistor includes a gate terminal coupled to a first node, a first terminal coupled to the first node, and a second terminal configured to receive a ground voltage, and The second transistor includes a gate terminal coupled to the first node, a first terminal coupled to a second node, and a second terminal coupled to the first node, and The second node serves as the output terminal of the first voltage source to generate the first voltage.
6. The voltage reference circuit of claim 3, wherein the first transistor and the second transistor are in a diode-connected configuration.
7. The voltage reference circuit of claim 6, wherein, The first transistor includes a gate terminal coupled to a first node, a first terminal coupled to the first node, and a second terminal coupled to a second node, and The second transistor includes a gate terminal coupled to a third node, a first terminal coupled to the second node, and a second terminal coupled to the third node, and The first node serves as an output terminal of the first voltage source to generate the first voltage.
8. The voltage reference circuit of claim 2, wherein, The first temperature sensitive device includes a plurality of first transistors arranged in a first stacked gate structure; The plurality of first transistors is divided into a first portion and a second portion, each first transistor within the first portion having a first threshold voltage, each first transistor within the second portion having a second threshold voltage different from the first threshold voltage; the second temperature sensitive device includes a plurality of second transistors divided and arranged in a second stacked gate structure, and The plurality of second transistors is divided into a third portion and a fourth portion, each second transistor within the third portion having a third threshold voltage, and each second transistor within the fourth portion having a fourth threshold voltage different from the third threshold voltage.
9. A voltage generation circuit, comprising: A first temperature sensitive device of a first type, and A second temperature sensitive device of a second type, Wherein the first temperature sensitive device and the second temperature sensitive device are arranged in a cascade structure, Wherein an output voltage obtained at an output terminal of the voltage generating circuit is equal to a first voltage across the first temperature sensitive device plus a second voltage across the second temperature sensitive device, Wherein the output voltage monotonically decreases with the absolute temperature of the voltage generation circuit.
10. A method of operating a voltage reference circuit, comprising: Arranging first and second temperature sensitive devices in a cascade structure to form a first voltage source, the first temperature sensitive device being different in type or threshold voltage from the second temperature sensitive device; generating a first voltage by the first voltage source, the first voltage being complementary to an absolute temperature of the first voltage source; Generating a second voltage by a second voltage source, the second voltage being proportional to the absolute temperature, and A reference voltage is generated by compensating the first voltage with the second voltage.

Description

Voltage generating circuit, voltage reference circuit and operation method thereof Technical Field Embodiments of the present application relate to a voltage generating circuit, a voltage reference circuit, and methods of operating the same. Background The current trend toward miniaturization of Integrated Circuits (ICs) has led to the development of smaller, more efficient devices with increased functionality and higher operating speeds. This miniaturization process also brings more stringent design and manufacturing requirements, as well as reliability challenges. Electronic Design Automation (EDA) tools are used to create, optimize and verify standard cell layout designs for integrated circuits, ensuring that they meet design and manufacturing specifications. Disclosure of Invention According to one aspect of an embodiment of the present application, there is provided a voltage reference circuit comprising a first voltage source configured to generate a first voltage that monotonically decreases with an absolute temperature of the voltage reference circuit, and a second voltage source configured to generate a second voltage that monotonically increases with the absolute temperature of the voltage reference circuit, wherein the second voltage is compensated with the first voltage to generate a reference voltage, wherein the first voltage source comprises a first temperature sensitive device of a first type and a second temperature sensitive device of a second type arranged in a cascade structure, wherein a first voltage obtained at an output terminal of the first voltage source is equal to a third voltage across the first temperature sensitive device plus a fourth voltage across the second temperature sensitive device. According to another aspect of an embodiment of the present application, there is provided a voltage generation circuit comprising a first temperature sensitive device of a first type, and a second temperature sensitive device of a second type, wherein the first temperature sensitive device and the second temperature sensitive device are arranged in a cascade structure, wherein an output voltage obtained at an output terminal of the voltage generation circuit is equal to a first voltage across the first temperature sensitive device plus a second voltage across the second temperature sensitive device, wherein the output voltage monotonically decreases with an absolute temperature of the voltage generation circuit. According to yet another aspect of an embodiment of the present application, there is provided a method of operating a voltage reference circuit comprising arranging first and second temperature sensitive devices in a cascade structure to form a first voltage source, the first temperature sensitive device being different in type or threshold voltage from the second temperature sensitive device, generating a first voltage by the first voltage source, the first voltage being complementary to an absolute temperature of the first voltage source, generating a second voltage by the second voltage source, the second voltage being proportional to the absolute temperature, and generating the reference voltage by compensating the first voltage with the second voltage. Drawings The various aspects of the disclosure are best understood from the following detailed description when read in connection with the accompanying drawings. It should be emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale and are used for illustration purposes only. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. Fig. 1 is a block diagram of a voltage reference circuit according to some embodiments of the present disclosure. Fig. 2 is a diagram illustrating voltage compensation of a voltage reference circuit according to some embodiments of the present disclosure. Fig. 3A is a circuit diagram of a voltage source according to an embodiment of the present disclosure. Fig. 3B is a circuit diagram of a voltage source according to another embodiment of the present disclosure. Fig. 3C is a diagram illustrating a relationship between voltages VCTATP and VCTATN according to some embodiments of the present disclosure. Fig. 4A is a circuit diagram of a voltage source according to yet another embodiment of the present disclosure. Fig. 4B is a circuit diagram of a voltage source according to yet another embodiment of the present disclosure. Fig. 5A is a schematic diagram of a stacked gate device according to some embodiments of the present disclosure. Fig. 5B is an equivalent circuit diagram of the stacked gate device of fig. 5A. Fig. 6A is a schematic diagram of a stacked gate device in a diode connected configuration according to some embodiments of the present disclosure. Fig. 6B is a graph showing a change in a voltage-temperature curve of the stacked gate device in fig. 6A. Fig. 7A-7D are circuit diag