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Controlling switching mode power supply of power amplifier

A technology of switching power supply and power amplifier, which is applied in the direction of power amplifiers, amplifiers, parts of amplifiers, etc., can solve the problems of low SMPS efficiency, high power consumption, etc., and achieve the effect of easy implementation and flexible control

Inactive Publication Date: 2009-07-08
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this means lower SMPS efficiency and thus higher power consumption

Method used

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  • Controlling switching mode power supply of power amplifier
  • Controlling switching mode power supply of power amplifier
  • Controlling switching mode power supply of power amplifier

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[0023] Figure 2A An example of a switching power supply is shown. Switching mode power supply 108 converts the battery voltage V BAT converted to the voltage level required by the power amplifier V PA . The switching mode power supply 108 generally includes a switching converter 200 or power stage, and a control circuit 202 for the switching converter. exist Figure 2A In the example, the input of the switching mode power supply includes the reference voltage V M and clock signal CLK. Depending on the type of switching converter and the type of control it has, there are many ways to implement a switching power supply.

[0024] A switching converter can be implemented as a buck converter with a step-down characteristic behavior. Therefore, the output voltage of the converter V OUT is always higher than the converter input voltage V BAT Low. The converter can also be implemented as a boost converter with a step-up characteristic behavior, where the converter output vo...

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Abstract

A radio frequency transceiver is provided. The transceiver comprises a receiver for receiving transmission at a first radio frequency and a transmitter for transmitting at a second radio frequency, and in the transmitter a power amplifier (100) with a switching mode power supply (108). The transceiver further comprises a controller (406) configured to vary the switching frequency of the switching mode power supply on the basis of the frequency separation of the first and the second radio frequencies.

Description

technical field [0001] This invention relates to switched mode power supplies commonly used in radio frequency transmitters. More specifically, the invention relates to how to control a switched mode power supply. Background technique [0002] A switched-mode power supply (SMPS) is used to feed power to the power amplifier. This arrangement is used, for example, in many portable radio frequency transmitters between the battery and the transmitter's power amplifier. The main reason for using a switching mode power supply is its good efficiency. For example, the power loss of a linear regulator is much greater than that of a switching power supply. [0003] figure 1 An example of a high efficiency RF transmitter layout is shown. The transmitter includes a radio frequency power amplifier 100 for amplifying a signal 102 to be transmitted prior to transmission by an antenna 104 . The transmitter also includes a battery for supplying the voltage V BAT battery 106 . This ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H04B1/40H04J13/04
CPCH02M1/44H03F2200/504H04B15/005H04B1/0475H04B1/525H03F1/0238H04B2215/065H04W88/02H03F3/24
Inventor S·阿波雅V·格里戈里S·康加斯玛
Owner NOKIA CORP