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High-efficiency and high-fidelity envelope modulator

An envelope modulation and high-fidelity technology, which is applied in the field of high-efficiency and high-fidelity envelope modulator structure, can solve high-fidelity problems, achieve high efficiency and high-fidelity, high-precision envelope tracking, and save bandwidth The effect of the restriction

Inactive Publication Date: 2018-01-23
SOUTHEAST UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above four envelope modulators can only achieve high efficiency or only high fidelity

Method used

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  • High-efficiency and high-fidelity envelope modulator
  • High-efficiency and high-fidelity envelope modulator
  • High-efficiency and high-fidelity envelope modulator

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention will be further described

[0020] The high-efficiency and high-fidelity envelope modulator of the present invention includes a linear amplifier stage 1, a current sensing unit 2, a hysteresis comparator 3, an anti-through buffer stage 4, and a switch amplifier stage 5 connected in sequence; wherein, the linear amplifier stage 1 includes The folded cascade amplifier OTA and the class AB output buffer composed of the first pull-up transistor M1 and the first pull-down transistor M2 are cascaded to form a two-stage cascade structure. The linear amplifier stage is used as an independent voltage source to amplify the envelope signal through the feedback network, and at the same time Compensate the ripple current of the switching amplifier stage; the current sensing unit 2 is used to detect the output current of the linear amplifier stage, and the current sensing resistor R sen Generate a voltage drop on t...

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Abstract

The invention discloses a high-efficiency and high-fidelity envelope modulator comprising a linear amplification stage (1), a current sensing unit (2), a hysteresis comparator (3), a counter direct connection buffer stage (4) and a switch amplification stage (5), which are connected in sequence, wherein the linear amplification stage is used as an independent voltage source to amplify an envelopesignal via a feedback network and meanwhile compensates the ripple current of the switch amplification stage, the current sensing unit is used for detecting the output current of the linear amplification stage, generating a voltage drop on a current sensing resistor, and comparing the voltage drop with the hysteresis voltage of the hysteresis comparator to change the working state of the switch amplification stage, the counter direct connection buffer stage is used for enhancing the driving ability of the input signal of the switch amplification stage, so that the output signal of the hysteresis comparator can drive the switching tube with a large size; and the switch amplification stage is used as a controlled current source to provide the most current for the load. High-precision envelope tracking is achieved, and compared with the traditional envelope modulator structure, higher efficiency and fidelity are achieved.

Description

technical field [0001] The invention relates to an envelope modulator structure, in particular to a high-efficiency and high-fidelity envelope modulator structure suitable for an envelope tracking power amplifier. Background technique [0002] For an envelope tracking power amplifier, the envelope signal from a modem or envelope detector should be linearly amplified by an envelope modulator to provide the supply voltage for the power amplifier. The envelope modulator must have a wide bandwidth, which is larger than the bandwidth of the envelope signal, and has high efficiency in the entire bandwidth. At the same time, the bandwidth of the envelope signal is several times that of the modulation signal, so it is difficult to achieve linear amplification of wideband signals with high efficiency. [0003] In traditional envelope modulators, the current sense resistor is usually small to reduce power consumption, but such a small resistor is difficult to achieve precisely. In t...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F3/21
Inventor 吴建辉陈建芳李红
Owner SOUTHEAST UNIV
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