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Power supply control for amplifier in wireless modem devices

A power amplifier and power supply technology, which is applied in the direction of amplifiers, power amplifiers, amplifier parts, etc., can solve the problems of DC-DC boost converter low efficiency, violation of PCMCIA power consumption regulations, etc.

Inactive Publication Date: 2008-07-30
SONY ERICSSON MOBILE COMM AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inefficiency of the DC-DC boost converter leads to a violation of the PCMCIA power consumption specification when the PC card operates at the higher output power required for a modulation mode like GMSK

Method used

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  • Power supply control for amplifier in wireless modem devices
  • Power supply control for amplifier in wireless modem devices

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Embodiment Construction

[0017] The present invention describes and discloses a means of optimizing the performance of a power amplifier, wherein the battery can be used at high transmit power conditions and boost can be used at lower TX power conditions.

[0018] In one embodiment shown in FIG. 1 , a PC card is disclosed that can use both GSMK (high TX power / high current) and 8-PSK (low TX power / low current) modulation modes. This is achieved by designing a boost power supply for GSM / GPRS / EGPRS PC Cards incorporating a bypass circuit for operation in GMSK modulation mode. The bypass circuit makes it possible to meet the spectral requirements of 8-PSK transmission modulation and keep the lowest possible GMSK power consumption.

[0019] Referring to FIG. 1 , the bypass circuit 5 includes switch control logic, a DC / DC boost converter 35 , a boost switch 15 , a battery switch 20 , a baseband circuit 30 and a comparator circuit 50 . Switch control logic 10 is used to control two load switches to a power ...

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PUM

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Abstract

A bypass circuit is disclosed for use with lower power supply voltage PC cards. The bypass circuit controls the power supply voltage fed to a power amplifier when switching between a lower power 8-PSK modulation mode and a higher power GMSK modulation mode. A step-up DC / DC converter provides a higher voltage to the power amplifier than can be supplied by an original power supply. Switch control logic controls a step-up switch and a battery switch. The step-up switch is turned on when operating in an 8-PSK modulation mode to provide a higher voltage to the power amplifier than the original power supply voltage. The battery switch is turned on when operating in the GMSK modulation mode to provide the original power supply voltage to the power amplifier.

Description

[0001] Acronym List [0002] EDGE GSM Evolution Technology for Raising Data Rate [0003] EGPRS Enhanced General Packet Radio Service [0004] GMSK Gaussian Minimum Shift Keying [0005] GPRS general packet radio service [0006] GSM Global System for Mobile Communications [0007] PCMCIA Personal Computer Memory Card International Association [0008] PSK phase shift keying Background technique [0009] Power amplifiers used in GSM / GPRS / EGPRS cellular handsets are designed to operate from batteries, which provide a typical supply voltage of 3.6 volts. However, since the PC card supply voltage is rated at 3.3 volts, using an amplifier of the same power would cause problems in a PC card application. The lower operating voltage of the PC card makes it extremely difficult to meet the requirements of the 8-PSK transmit modulation spectrum at the maximum output power as defined in the GSM 05.05 cellular phone specification. This particular problem was solved by designing a D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/06
CPCH03F3/24H03F1/0205H03F1/0238H03F1/0244H03F2200/511H03F2200/513
Inventor P·伊尔C·哈恩
Owner SONY ERICSSON MOBILE COMM AB