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Anti-saturation current mode control radio frequency power amplifier

A radio frequency power and amplifier technology, applied in the field of radio frequency power amplifiers, can solve problems such as inability to meet communication standards, switching spectrum deterioration, etc., and achieve the effects of improving switching spectrum characteristics, being less susceptible to interference, and improving performance

Pending Publication Date: 2020-02-18
RDA MICROELECTRONICS BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the control voltage V ramp When it increases, the control loop approaches saturation, which will lead to a sharp deterioration of the switching spectrum, which cannot meet the requirements of communication standards

Method used

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  • Anti-saturation current mode control radio frequency power amplifier
  • Anti-saturation current mode control radio frequency power amplifier
  • Anti-saturation current mode control radio frequency power amplifier

Examples

Experimental program
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Embodiment Construction

[0046] see figure 1 , Figure 1a , which is an embodiment of the anti-saturation radio frequency power amplifier using a current mode control loop provided by the present application. The RF power amplifier shown in this embodiment includes a pre-amplifier, a power output stage, a voltage-to-current conversion circuit, a current error amplifier and an anti-saturation circuit.

[0047] The pre-amplifier is used to convert the RF input signal V in Perform pre-amplification to obtain a larger dynamic range, and output a pre-amplified RF signal V pre .

[0048] The power output stage includes a power amplifier circuit and a current sampling circuit. The power amplifier circuit is used at the control voltage V ramp Under the control of the pre-amplified RF signal V pre Perform power amplification to obtain the output power V out . The output power V out After passing through the matching circuit, it is emitted by the antenna. The current sampling circuit is used to sample...

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PUM

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Abstract

The invention discloses an anti-saturation current mode control radio frequency power amplifier. The anti-saturation current mode control radio frequency power amplifier comprises a pre-amplifier, a power output stage, a voltage-current conversion circuit, a current error amplifier and an anti-saturation circuit, the power output stage is used for performing power amplification on a pre-amplifiedradio frequency signal under the control of the control voltage to obtain output power; and the current flowing through the power transistor in the power output stage is sampled. And the voltage-current conversion circuit is used for converting the control voltage into reference current in direct proportion to the control voltage. And the current error amplifier is used for comparing the samplingcurrent with a reference current to obtain a comparison current and providing the comparison current to the pre-amplifier. And the anti-saturation circuit is used for feeding back the output end of the current error amplifier to the first input end of the current error amplifier or feeding back to the control voltage input end. The application has the characteristics of accurate power control andsaturation resistance.

Description

technical field [0001] The present application relates to a radio frequency power amplifier in a mobile terminal, in particular to a radio frequency power amplifier including a power control circuit. Background technique [0002] In the mobile terminal, the RF power amplifier is used to amplify the power of the RF signal, and then feed it to the antenna for external transmission. During the communication process between the mobile terminal and the base station, due to the different distances between the two, or the antenna of the mobile terminal being blocked, etc., it is often necessary to perform power control on the transmit power output by the radio frequency power amplifier in the mobile terminal. For example, a power control circuit is included in a radio frequency power amplifier for 2G (second generation mobile communication technology), and the power control circuit controls the voltage V ramp Continuously control the output power of the RF power amplifier. [000...

Claims

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Application Information

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IPC IPC(8): H03F3/24H03F1/38
CPCH03F3/24H03F1/38Y02D30/70
Inventor 武振宇贾斌陈永聪
Owner RDA MICROELECTRONICS BEIJING