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Dynamic bias current optimized operational amplifier

An operational amplifier and bias current technology, applied in the field of operational amplifiers, can solve problems such as power consumption not being optimized, and achieve the effects of reducing average current, power consumption, and error reduction

Active Publication Date: 2018-11-23
苏州真感微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the bias current of the conventional switched capacitor integrator (or sampling, amplifier, etc.) is designed to be a fixed value. Although it meets the maximum demand for bias current during the charging swing period, the power consumption has not been optimized.

Method used

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  • Dynamic bias current optimized operational amplifier
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Embodiment Construction

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0042] An op amp optimized for dynamic bias current, such as Figure 4 , Figure 5 , Figure 6 As shown, it includes an input pair transistor 301, a tail bias current source 303, a tail bias current source control switch 313, a non-turn-off tail current source 302, a cascode PMOS pair transistor 309, a pair of PMOS current sources 305, a A pair of PMOS current source control switches 315, a pair of non-shutdown PMOS current sources 304, a pair of cascode NMOS transistors 306, a pair of NMOS current sources 308, a pair of NMOS current source...

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Abstract

The invention provides a dynamic bias current optimized operational amplifier, which comprises an input pair tube, an output stage, a bias circuit switching control, a non-overlapping pulse generationsource of the operational amplifier; few CMOS devices and simple circuit improvement are added and the average current of the operational amplifier in the switched capacitor system is greatly reduced, so that the power consumption of the entire switched capacitor system is reduced. The dynamic bias current optimized operational amplifier in the invention satisfies the requirements of data acquisition and analog signal processing integrated circuits having low power consumption requirements or powered by a battery, which has wide applicable range, especially in the signal acquisition aspect ofthe Internet of Things sensors.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to an operational amplifier optimized for dynamic bias current. Background technique [0002] like figure 1 The fully differential switched capacitor reverse integrator used in analog signal processing is shown as an example. The most conventional basic circuit structure is to use a two-phase square wave to control the CMOS switch + integrator. The pulse square wave of the first phase is the sampling time, the second phase of the pulsed square wave is the amplification or integration time. In this way, the sampling + integration / amplification of the signal is realized within one cycle. in: [0003] 101 is a differential signal source, [0004] 102, 112, 103, 113, 202, 212, 203, and 213 are CMOS switch tubes turned on by positive pulses, [0005] 104 and 204 are differential signal sampling capacitors, Cin, 105 and 205 are differential integration capacitors, Cint, [0006] 1...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F3/45
CPCH03F1/0216H03F3/45179H03F2203/45062H03F2203/45024H03F2203/45168
Inventor 王磊古振刚
Owner 苏州真感微电子科技有限公司