Low-dropout linear regulator of improved digital-analog hybrid circuit

A low-dropout linear, digital-analog hybrid technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as increasing static power consumption and chip area, affecting the quality of the output signal of the reference voltage source, and limiting the power supply voltage. , to achieve the effect of optimizing the load regulation rate, improving the circuit characteristics and reducing the interference

CN104090617AInactive Publication Date: 2014-10-08周国文
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-10-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low-dropout linear regulator of an improved digital-analog hybrid circuit. The digital-analog hybrid circuit comprises a power circuit, an analog circuit and a digital circuit which are integrated on a PCB. The digital circuit and the analog circuit are physically isolated. An analog circuit ground and a digital circuit ground are separately arranged in different stratums. The low-dropout linear regulator comprises an error amplifying circuit, a power level output circuit and a bandwidth increasing circuit. The output end of the power level output circuit is connected to the positive-phase input end of the error amplifying circuit in a negative feedback mode. The negative-phase input end of the error amplifying circuit is connected with a reference voltage. The output end of the bandwidth increasing circuit is connected with the input end of the power level output circuit, and the bandwidth increasing circuit is used as a second level non-inverting amplifier for increasing the bandwidth of the whole negative feedback loop circuit. The low-dropout linear regulator can improve one of the functions of reducing interference between a power line and an earth wire, achieving the high supply voltage rejection ratio, improving work stability and optimizing load regulation.
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Description

technical field

[0001] The invention relates to integrated circuit design technology, in particular to a digital-analog hybrid circuit (chip) and its auxiliary circuits. Background technique

[0002] At present, digital-analog hybrid circuits are more and more widely used. Due to the existence of digital circuits and analog circuits at the same time, many factors must be considered during design. Here are some examples:

[0003] One is that the grounding should be reasonable. In the digital-analog hybrid circuit, the digital signal is a noise source of the analog signal, which will bring ground bounce noise and power disturbance to the entire circuit. These noises and interferences are coupled into the analog circuit, which will affect the working performance of the analog circuit. Since most of the interference sources are generated through the ground wire and the power wire, and the noise interference caused by the ground wire is the largest, the design of the ground wi...

Examples

Embodiment Construction

[0022] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar extensions without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0023] see figure 1 , is a block diagram of a digital-analog hybrid circuit according to an embodiment of the present invention. This embodiment shows a reasonable layout of the digital-analog hybrid circuit. The digital-analog hybrid circuit includes a power supply circuit (including a reference source), a digital circuit (such as a linear digital power supply circuit, a clock circuit, a DSP device, a CPLD device and an FPGA device) and an analog circuit (such as a digital-to-analog converter, an analog-to-digital converter) ...