阅读说明：本技术 一种采用bf量化器的新型数字ldo电路 (Novel digital LDO circuit adopting BF quantizer ) 是由 李凡阳 程树英 刘晓权 于 2019-11-07 设计创作，主要内容包括：本发明涉及一种采用BF量化器的新型数字LDO电路,其特征在于,所述电路包括粗调节环路、细调节环路、粗调节功率管和细调节功率管；所述粗调节环路包括第一压控振荡器、第二压控振荡器、BF量化器和数字控制模块,所述BF量化器与第一压控振荡器、第二压控振荡器和数字控制模块分别连接；所述细调节环路包括依次连接的动态比较器、二选一多路选择器、累加/累减模块；所述粗调节功率管与数字控制模块；所述细调节功率管与累加/累减模块连接。本发明电路结构简单,在保证瞬态响应时间效果良好的情况下,确保电路功耗较低,有更好的稳定性。(The invention relates to a novel digital LDO circuit adopting a BF quantizer, which is characterized by comprising a coarse regulation loop, a fine regulation loop, a coarse regulation power tube and a fine regulation power tube; the coarse adjustment loop comprises a first voltage-controlled oscillator, a second voltage-controlled oscillator, a BF quantizer and a digital control module, wherein the BF quantizer is respectively connected with the first voltage-controlled oscillator, the second voltage-controlled oscillator and the digital control module; the fine regulation loop comprises a dynamic comparator, an alternative multi-path selector and an accumulation/subtraction module which are connected in sequence; the coarse adjustment power tube and the digital control module; the fine adjustment power tube is connected with the accumulation/subtraction module. The invention has simple circuit structure, ensures lower power consumption of the circuit and better stability under the condition of ensuring good transient response time effect.)

1. A novel digital LDO circuit adopting a BF quantizer is characterized by comprising a coarse regulation loop, a fine regulation loop, a coarse regulation power tube and a fine regulation power tube; the coarse adjustment loop comprises a first voltage-controlled oscillator, a second voltage-controlled oscillator, a BF quantizer and a digital control module, wherein the BF quantizer is respectively connected with the first voltage-controlled oscillator, the second voltage-controlled oscillator and the digital control module; the fine regulation loop comprises a dynamic comparator, an alternative multi-path selector and an accumulation/subtraction module which are connected in sequence; the coarse adjustment power tube and the digital control module; the fine adjustment power tube is connected with the accumulation/subtraction module.

2. According to the claimsAsk 1 the novel digital LDO circuit who adopts BF quantizer, its characterized in that: the input end of the first voltage-controlled oscillator is connected with a reference voltage V _refThe output end of the input end of the BF quantizer is connected with the input end of the BF quantizer; the input end of the second voltage-controlled oscillator is connected with a feedback voltage V ₁The output end is connected with the other input end of the BF quantizer; the output end of the BF quantizer is connected with the input end of the digital control module; the input end of the coarse adjustment power tube array is connected with the binary output of the digital control module, and the output end of the coarse adjustment power tube array enters the feedback resistance network to form voltage feedback to generate voltage V ₁。

3. The novel digital LDO circuit using BF quantizer according to claim 1, characterized by: and a second comparator is also arranged in the BF quantizer, the second comparator is connected with the output of the first voltage-controlled oscillator and the RES of the BF quantizer, and a clock Clk is formed at the output end of the second comparator to control the dynamic comparator and the accumulation/subtraction module.

4. The novel digital LDO circuit employing a BF quantizer of claim 3, wherein: two access ends of the dynamic comparator are connected with a reference voltage V _refAnd a feedback voltage V ₁Comparing under the control of a clock Clk, and connecting an output end with a regulation end of the alternative multiplexer; two input ends of the alternative multiplexer are connected with a high level and a low level, and an output end of the alternative multiplexer is connected with the input of the accumulation/subtraction module; the accumulation/accumulation module performs binary output under the control of a clock Clk to perform left-right displacement and regulate and control a fine regulation power tube array accessed by output; the output of the fine regulation power tube array is connected to the voltage feedback resistance load network to output feedback voltage V ₁。

Technical Field

The invention relates to the technical field of integrated circuits, in particular to a novel digital LDO circuit adopting a BF quantizer.

Background

At present, the electronic equipment is portable and miniaturized, and the system integration level is higher and higher. The power management modules in the system become more complex and important. Many of these modules switch at high speed with the system clock, which requires the power management module to have excellent stability and fast transient response. The digital LDO has the advantages that the analog LDO cannot be replaced, low voltage, low power consumption and interference resistance, and has excellent stability. Digital LDOs are one of the current research and development directions for power management units.

Conventional digital LDO As shown in FIG. 2, module 11 is a voltage quantizer for reading a 1-bit comparison of the output voltage with a reference voltage, the voltage quantizer producing a digital code (N) proportional to the voltage error _OUT). The module 12 is a digital control module that converts the digital code (N) _OUT) The output stage comprises an array of PMOS transistors as switches driven by digital control, compared to a desired value (N). Such control requires many clock cycles to reach steady state and using higher clock frequencies for loop sampling is the only solution for this architecture to improve transient response. A large amount of power consumption is consumed, resulting in stability problems.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a novel digital LDO circuit using a BF quantizer, which ensures lower power consumption and better stability of the circuit under the condition of ensuring good transient response time.

In order to achieve the purpose, the invention adopts the following technical scheme:

a novel digital LDO circuit adopting a BF quantizer comprises a coarse regulation loop, a fine regulation loop, a coarse regulation power tube and a fine regulation power tube; the coarse adjustment loop comprises a first voltage-controlled oscillator, a second voltage-controlled oscillator, a BF quantizer and a digital control module, wherein the BF quantizer is respectively connected with the first voltage-controlled oscillator, the second voltage-controlled oscillator and the digital control module; the fine regulation loop comprises a dynamic comparator, an alternative multi-path selector and an accumulation/subtraction module which are connected in sequence; the coarse adjustment power tube and the digital control module; the fine adjustment power tube is connected with the accumulation/subtraction module.

Further, the output of the first voltage controlled oscillatorAn input terminal connected to a reference voltage V _refThe output end of the input end of the BF quantizer is connected with the input end of the BF quantizer; the input end of the second voltage-controlled oscillator is connected with a feedback voltage V ₁The output end is connected with the other input end of the BF quantizer; the output end of the BF quantizer is connected with the input end of the digital control module; the input end of the coarse adjustment power tube array is connected with the binary output of the digital control module, and the output end of the coarse adjustment power tube array enters the feedback resistance network to form voltage feedback to generate voltage V ₁。

Furthermore, a second comparator is arranged in the BF quantizer, the second comparator is connected to the output of the first voltage-controlled oscillator and the RES of the BF quantizer, and a clock Clk is formed at the output end of the second comparator to control the dynamic comparator and the accumulation/subtraction module.

Furthermore, two access ends of the dynamic comparator are connected with a reference voltage V _refAnd a feedback voltage V ₁Comparing under the control of a clock Clk, and connecting an output end with a regulation end of the alternative multiplexer; two input ends of the alternative multiplexer are connected with a high level and a low level, and an output end of the alternative multiplexer is connected with the input of the accumulation/subtraction module; the accumulation/accumulation module performs binary output under the control of a clock Clk to perform left-right displacement and regulate and control a fine regulation power tube array accessed by output; the output of the fine regulation power tube array is connected to the voltage feedback resistance load network to output feedback voltage V ₁。

Compared with the prior art, the invention has the following beneficial effects:

the invention has simple circuit structure, ensures lower power consumption of the circuit and better stability under the condition of ensuring good transient response time effect.

Drawings

FIG. 1 is a circuit schematic of the present invention;

FIG. 2 is a circuit diagram of a conventional digital LDO circuit in the background of the invention;

in the figure, 1-a first voltage-controlled oscillator, 2-a second voltage-controlled oscillator, 3-BF quantizer, 4-digital control module, 5-coarse regulation power tube array, 6-dynamic comparator, 7-alternative multiplexer, 8-accumulation/accumulation module, 9-fine regulation power tube array and 10-BF quantizer comparator.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments.

Referring to fig. 1, the present invention provides a novel digital LDO circuit using a BF quantizer, the circuit includes a coarse regulation loop, a fine regulation loop, a coarse regulation power transistor, and a fine regulation power transistor; the coarse adjustment loop comprises a first voltage-controlled oscillator, a second voltage-controlled oscillator, a BF quantizer and a digital control module, wherein the BF quantizer is respectively connected with the first voltage-controlled oscillator, the second voltage-controlled oscillator and the digital control module; the fine regulation loop comprises a dynamic comparator, an alternative multi-path selector and an accumulation/subtraction module which are connected in sequence; the coarse adjustment power tube and the digital control module; the fine adjustment power tube is connected with the accumulation/subtraction module.

In this embodiment, the input terminal of the first voltage-controlled oscillator is connected to a reference voltage V _refThe output end of the input end of the BF quantizer is connected with the input end of the BF quantizer; the input end of the second voltage-controlled oscillator is connected with a feedback voltage V ₁The output end is connected with the other input end of the BF quantizer; the output end of the BF quantizer is connected with the input end of the digital control module; the input end of the coarse adjustment power tube array is connected with the binary output of the digital control module, and the output end of the coarse adjustment power tube array enters the feedback resistance network to form voltage feedback to generate voltage V ₁. The output end of the comparator in the BF quantizer is connected with the output of a voltage-controlled oscillator and the RES of the BF quantizer, and the output end of the comparator forms a clock Clk to control the dynamic comparator and an accumulation/accumulation module.

In this embodiment, the two access terminals of the dynamic comparator are connected to a reference voltage V _refAnd a feedback voltage V ₁Comparing under the control of a clock Clk, and connecting an output end with a regulation end of the alternative multiplexer; two input ends of the alternative multiplexer are connected with a high level and a low level, and an output end of the alternative multiplexer is connected with the input of the accumulation/subtraction module; the accumulation/accumulation module performs binary output under the control of a clock Clk to perform left-right displacement and regulate and control a fine regulation power tube array accessed by output; the output access voltage feedback of the fine adjustment power tube arrayFeedback voltage V output by load-resisting network ₁。

In this embodiment, a full-digital LDO based on a beat frequency quantizer is selected, and V is input _REFAnd V ₁Conversion of the proportional frequency f by two identical VCOs in the module 1 _REFAnd f _OUTIs CK _refAnd CK _outThen, through a module 3 circuit, a digital code (N) is generated according to the input frequency _OUT). Module 4 will be N _OUTComparing with the expected value (N), if N _OUTThe difference from the desired value (N) is greater, entering the coarse regulation system, accumulating and eliminating the error N by switching on/off the Pmos array of the module 5 of the coarse regulation loop _OUTWhen N is present _OUTWhen the distance between the expected value (N) and a certain limit is reached, the counter of the module 3 does not work and is not input at the moment, the beat frequency quantizer enters a standby state, and the feedback input V is input through a module 6 in the fine regulation circuit ₁And V _REFComparing the decision block 8 to determine whether to accumulate or subtract, the Pmos array of the back block 9 accumulates and eliminates the error N _OUT。

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.