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Operational amplifier circuit, operational amplifier and envelope follower power supply

A technology of operational amplifiers and following the power supply, which is applied in the direction of improving amplifiers to improve efficiency, amplifiers, differential amplifiers, etc., and can solve the problem that the slew rate is difficult to meet the demand

Active Publication Date: 2015-03-25
SOI MICRO CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this structure requires that the slew rate of the linear-stage operational amplifier is difficult to meet the demand when the quiescent current is low.

Method used

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  • Operational amplifier circuit, operational amplifier and envelope follower power supply

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] The application discloses an operational amplifier circuit, comprising: a first stage and a second stage, the first stage includes an input stage and a drain load, compared with the operational amplifier circuit in the prior art, the operational amplifier circuit The input stage adopts the form of a cross-coupled pair, the load of the cross-coupled pair is a cascode current mirror, and the drain load of the circuit of the operational amplifier is a casco...

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Abstract

The invention discloses an operational amplifier circuit which comprises a first level and a second level. The first level comprises 22 MOS transistors from the first MOS transistor to the twenty-second MOS transistor, a first current source, a second current source, a first capacitor and a second capacitor. The second level comprises a PMOS transistor and an NMOS transistor, wherein the drain electrode of the PMOS transistor and the drain electrode of the NMOS transistor are connected. The input level of an operational amplifier is of a cross coupling pair structure, a load of a cross coupling pair is a cascode current mirror so that an I-V curve of the operational amplifier can have an expansion character instead of an amplitude limiting character of a common differential pair, and therefore a high slew rate can also be obtained under the condition of low static current.

Description

technical field [0001] The present application relates to the technical field of analog circuits, and more specifically, the present application relates to an operational amplifier circuit, an operational amplifier and an envelope follower power supply. Background technique [0002] Due to the low efficiency of the power amplifier (PA) due to the peak-to-average ratio of the RF output signal in 3G and 4G mobile communications, the envelope tracking technology is mainly used to improve the efficiency of the PA by modulating the power waveform of the PA, thereby prolonging the battery life. Currently, after using the envelope tracking technology, the battery life of mobile phones using the 4G Long Term Evolution (Long Term Evolution, LTE) standard is significantly improved. [0003] At present, the envelope tracking power supply mainly adopts the technical scheme of parallel connection of switch stage and linear stage. The switching stage adopts a PWM-controlled DC-DC structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F1/02H03F3/45475
Inventor 李志强萧延彬张雪张海英
Owner SOI MICRO CO LTD
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