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Electric efficiency raising circuit of radio-frequency power amplifier in double-mode mobile telephone

A radio frequency power, mobile phone technology, applied in gated amplifier, amplifier input/output impedance improvement, radio/induction link selection arrangement, etc., can solve problems such as consumption, high power, etc.

Inactive Publication Date: 2002-09-04
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this RF power amplifier will generate a lot of heat when it works in AMPS mode, thus consuming a lot of power
[0007] However, an RF power amplifier operating in AMPS mode does not require high linearity compared to operating in CDMA mode

Method used

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  • Electric efficiency raising circuit of radio-frequency power amplifier in double-mode mobile telephone
  • Electric efficiency raising circuit of radio-frequency power amplifier in double-mode mobile telephone
  • Electric efficiency raising circuit of radio-frequency power amplifier in double-mode mobile telephone

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Embodiment Construction

[0017] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

[0018] The characteristics of an RF power amplifier are mainly determined by the circuits around it. Here, the "peripheral circuit" refers to a power supply circuit and an input / output impedance circuit. In other words, the characteristics of the RF power amplifier are mainly determined by the impedance of the input and output. Also, the electrical efficiency and linearity characteristics mainly depend on the matching state of the output impedance.

[0019] In general, matching for high linearity is different from matching for high electrical efficiency.

[0020] Therefore, by matching the RF power amplifier for high linearity in CDMA mode and high electrical efficiency in AMPS mode, t...

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Abstract

An electrical efficiency improving circuit for a power amplifier in a dual-mode mobile phone, the mobile phone comprising: a radio frequency power amplifier for amplifying a radio frequency input signal, an antenna transceiving conversion device connected to an antenna, and an isolator connected to the antenna transceiving conversion device . The circuit includes: a CDMA matching circuit connected to the output terminal of the radio frequency power amplifier, used to match the output impedance of the radio frequency power amplifier in the CDMA working mode; an AMPS matching circuit connected to the output terminal of the radio frequency power amplifier, used for matching the output impedance of the radio frequency power amplifier in the AMPS working mode Matching the output impedance of the radio frequency power amplifier; the radio frequency switch is used to select the CDMA matching circuit or the AMPS matching circuit according to the mode control signal. The CDMA matching circuit includes an inductor connected between the output terminal of the RF power amplifier and the isolator. The AMPS matching circuit includes a capacitor connected between the RF switch and a node formed between the inductor and the isolator.

Description

technical field [0001] The present invention relates generally to dual-mode mobile phones, and more particularly to a circuit for maximizing the electrical efficiency (power rate) of an RF (Radio Frequency) power amplifier. Background technique [0002] In a mobile phone, the RF power amplifier consumes much more power than other components. Therefore, the RF power amplifier is the main problem causing shortened battery life and heat generation. [0003] Moreover, in a dual-mode mobile phone, when the operating mode of the mobile phone is switched from an analog communication mode to a digital communication mode, a high linearity of the RF power amplifier is required. [0004] Increasing the linearity of RF power amplifiers results in a decrease in electrical efficiency, thus causing problems of reduced battery life and heat generation in mobile phones. [0005] In general, dual-mode mobile phones that support both CDMA (Code Division Multiple Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/54H03F1/56H03F3/72H04B1/04H04B1/40
CPCH03F1/56H03F3/72H04B1/04H04B1/0458H04B1/406H04B1/54
Inventor 金学洙
Owner SAMSUNG ELECTRONICS CO LTD
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