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Operational amplifier

An operational amplifier and operational amplifier technology, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of operational amplifiers difficult to achieve high gain, low intrinsic gain of MOS transistors, etc., to improve speed, increase gain, Effects that improve speed and stability

Active Publication Date: 2016-08-10
南京德睿智芯电子科技有限公司
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Problems solved by technology

[0003] Conventional operational amplifiers mostly use the traditional CMOS process, but due to the low intrinsic gain of MOS transistors in this process, it is difficult for existing operational amplifiers to achieve high gain

Method used

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Embodiment Construction

[0028] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0029] Such as figure 1 As shown, the operational amplifier provided by the present invention is composed of a three-stage amplifying module and two common-mode feedback modules, wherein the first-stage amplifying module is a differential pair with a diode-connected MOS as a load, and is used to improve the input of the entire operational amplifier. Impedance; the main body of the second-stage amplification module adopts a sleeve-type gain-enhancing cascode structure, including two folded cascode structure auxiliary op amps, BN and BP, to increase the impedance of the current source, thereby improving the entire operational amplifier. The small-signal gain; the t...

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Abstract

The invention discloses a BiCMOS technical design operational amplifier comprising a first stage amplification module, a second stage amplification module, a third stage amplification module, a common mode feedback module DIFF CMFB circuit using two differential pairs, and a switch capacitance common mode feedback module CAP CMFB circuit; the operational amplifier is realized by a bipolar transistor and CMOS transistor BiCMOS technology, so low input impedance and high gain of an ambipolar circuit can be provided, and low power consumption and high integrated level of the CMOS circuit can be added, thus improving amplifier gains, reducing signal main channel parasitic capacitance, improving whole operational circuit speed, and improving ADC circuit speed and stability.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to an operational amplifier, in particular to a high-speed, high-gain operational amplifier used in a high-speed, high-precision pipeline ADC. Background technique [0002] Analog-to-Digital Converter (Analog to Digital Circuit, ADC) is an important part of mixed-signal systems. The trade-off advantages of pipeline ADC between accuracy, speed and power consumption make it widely used in high-resolution and wireless communication fields. a wide range of applications. At present, the noise of the sampling capacitor circuit, the bandwidth of the comparator and the load capacitance of all levels will affect the speed of the pipeline ADC, but the biggest impact on the speed of the pipeline ADC is the bandwidth of the operational amplifier of the sample and hold circuit and the residual operational amplifier of each level. The speed and accuracy of the ADC system are mainly dete...

Claims

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Application Information

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IPC IPC(8): H03F3/45
CPCH03F3/45282H03F2203/45062
Inventor 赵莉黄晶只生武
Owner 南京德睿智芯电子科技有限公司
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