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Operational amplifier and analog-digital converter with inductor and double power supplies

An operational amplifier, dual power supply technology, used in amplifiers with semiconductor devices/discharge tubes, DC-coupled DC amplifiers, amplifiers, etc., can solve problems such as limiting the overall performance of ADCs, improve phase margin, and speed up the establishment of Time and performance improvements

Active Publication Date: 2017-05-10
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the time-domain interleaving structure can be used to improve the speed of the overall ADC, the ADC with this structure usually introduces offset, gain, timing, bandwidth and other mismatches, which limit the overall performance of the ADC.
Single-channel GS / s high-speed and high-precision pipeline ADC has also been designed, but it needs to be realized by digital foreground and background calibration, and the operational amplifier becomes the key factor limiting the improvement of ADC performance
[0004] It is difficult for traditional operational amplifiers to meet the requirements of high speed and high precision at the same time, so it is necessary to design a new structure operational amplifier that can meet high gain and high bandwidth at the same time.

Method used

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  • Operational amplifier and analog-digital converter with inductor and double power supplies
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  • Operational amplifier and analog-digital converter with inductor and double power supplies

Examples

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Embodiment 1

[0040] See figure 1 , figure 1 It is a schematic diagram of a circuit structure of an operational amplifier powered by dual power supplies with inductance provided by an embodiment of the present invention. The operational amplifier 10 powered by inductive dual power supplies includes a preamplifier 11 and a main amplifier stage circuit 13; the preamplifier 11 includes a first switch M1, a second switch M2, a third switch M3, a fourth switch M4, and a fifth switch M5, the first inductance L1 and the second inductance L2; the main amplifier stage circuit 13 includes the sixth switch M6, the seventh switch M7, the eighth switch M8, the ninth switch M9, the tenth switch M10, the eleventh switch M11, the The twelfth switch M12 and the thirteenth switch M13.

[0041] Specifically, the first inductor L1, the fourth switch M4, the second switch M2, and the first switch M1 are sequentially connected in series between the voltage source VDD and the ground terminal GND; the second ind...

Embodiment 2

[0050] In this embodiment, on the basis of the above-mentioned embodiments, the working principle and connection relationship thereof will be further described with emphasis.

[0051] see again figure 1 , the operational amplifier 10 includes a preamplifier 11, which is composed of M1-M5, L1, and L2. It adopts a simple active load common-source amplifier, uses M2, M3 as input tubes, and uses NMOS tubes M4, M5 as loads. Two inductors L1, L2 are connected in series above M4, M5.

[0052]The preamplifier 11 is powered by a power supply voltage VDD of 1.2V, which can reduce circuit power consumption while ensuring that all MOS transistors work in a safe area. The input tubes M2 and M3 adopt the minimum channel length to make the circuit faster. Because the preamplifier 11 only provides low gain and introduces the secondary point of the overall operational amplifier 10 at its output end, the load transistors M4 and M5 also use the minimum channel length to reduce parasitic capaci...

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Abstract

The invention relates to an operational amplifier and an analog-digital converter with inductors and double power supplies. The operational amplifier (10) comprises a preamplifier (11) and a master amplifier circuit (13). The preamplifier (11) comprises a first switch (M1), a second switch (M2), a third switch (M3), a fourth switch (M4), a fifth switch (M5), a first inductor (L1) and a second inductor (L2). The master amplifier circuit (13) comprises a sixth switch (M6), a seventh switch (M7), a eighth switch (M8), a ninth switch (M9), a tenth switch (M10), an eleventh switch (M11), a twelfth switch (M12), a thirteenth switch (M13), a first amplifier (131) and a second amplifier (133). According to the embodiment of invention, a composite cascade structure combining a folding structure and a sleeve pipe structure is used, and at the same time serially connected inductors are introduced in the preamplifier to achieve the goal of high gain, high bandwidth and low energy consumption on the precondition of stable operation. The operational amplifier and analog-digital converter with inductor and double power supplies is applicable to the circuits requiring high speed and high precision in different circumstances.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an operational amplifier and an analog-to-digital converter powered by dual power supplies with inductance. Background technique [0002] With the continuous development of wireless communication technology, the demand for high-speed and high-precision analog / digital converters (Analog to Digital Converter, referred to as ADC) with radio frequency and intermediate frequency sampling continues to increase. The high sampling rate of ADC makes it have high bandwidth, so It can carry more information, simplifies the design of anti-folding filter and system, and provides high design flexibility, which can better assist the design of software radio. [0003] The operational amplifier is the key module of the high-speed and high-precision pipeline ADC. With the improvement of the sampling speed of the pipeline ADC, especially after video (Radio Frequency, RF) sam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/4539H03F2203/45028
Inventor 过良刘马良朱樟明丁瑞雪杨银堂
Owner XIDIAN UNIV
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