Comparator and analog-to-digital converter using same
An analog-to-digital converter, analog-to-digital conversion technology, applied in the direction of analog-to-digital converter, analog-to-digital conversion, code conversion, etc., can solve the problems of difficulty in adding output voltage of amplifier, increase of amplifier noise, and reduction of phase margin, etc. Achieve the effect of increasing speed, eliminating offset voltage, improving speed and accuracy
Pending Publication Date: 2022-03-04
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology
There are many ways to eliminate offset, such as input storage, output storage technology, but the disadvantage is that capacitance is introduced in the signal path, and the parasitic parameters of the plate under the capacitance may reduce the value of the pole in the circuit, thereby reducing the phase margin
In order to solve this problem, an auxiliary amplifier is usually added to isolate the signal path and the offset storage capacitor, thereby avoiding the offset of the amplifier, but the two-stage amplifier in the signal path is not ideal in a high-speed amplifier. The output voltage of amplifiers A1 and A2 It is quite difficult to add
Also, in order to increase the speed of the comparator, the bandwidth of the amplifier needs to be large enough, so the noise of the amplifier is also increased
Method used
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[0033] The present invention is described below based on examples, but the present invention is not limited to these examples only. In the following detailed description of the invention, some specific details are described in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. Well-known methods, procedures, procedures, components and circuits have not been described in detail in order to avoid obscuring the essence of the present invention.
[0034] Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0035] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected"...
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The invention discloses a comparator and an analog-to-digital converter applying the same, which are used for reducing latch offset and noise by adopting a two-stage operational amplifier structure so as to improve the precision of the comparator. In order to reduce the offset of the operational amplifier, a working stage of offset voltage elimination is added, and meanwhile, a short circuit stage is added in each bit of conversion of analog-to-digital conversion, so that the output common-mode voltage can be kept at a certain value, the speed of the comparator is increased, and the comparator with higher performance is obtained.
Description
technical field [0001] The present invention relates to a power electronic technology, more particularly, to a comparator and an analog-to-digital converter using the same. Background technique [0002] With the rapid development of science and technology, digital signal processing technology is more and more widely used in various fields of science and daily life. The signals processed by the digital system are digital signals, but the signals in nature, such as temperature, pressure, speed, sound, etc., which are often used in industrial detection control and life, are all continuously changing analog signals. In order to enable the digital system to process these analog signals, it is necessary to realize the mutual conversion between analog and digital, and the analog-to-digital converter (ADC) has become a key component in the connection between the analog system and the digital system. [0003] As we all know, the comparator is an important part of the high-precision ...
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IPC IPC(8): H03K5/24H03M1/12
CPCH03K5/2481H03M1/1245
Inventor 张丹妮曲光阳宋林
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD