Device and process for telecommunication

A device, radio frequency signal technology, applied in amplifiers with semiconductor devices/discharge tubes, impedance networks, electrical components, etc., can solve problems such as high material costs

Inactive Publication Date: 2000-03-29
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since power amplifiers for mobile phones are expensive devices, this results in higher bill-of-materials costs and requires additional space
This is a very important flaw, especially in mobile phones, because the space inside the mobile station is an important limiting factor

Method used

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  • Device and process for telecommunication
  • Device and process for telecommunication
  • Device and process for telecommunication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] best practice

[0034] exist figure 1 Among them, the letter f represents the frequency, the letter S represents the signal strength, figure 1 The spectra are shown for two radio frequency signals S1 and S2 from one power amplifier. This power amplifier exhibits a certain nonlinearity that causes harmonics to appear in the amplified signal. The main power in the signal S1 is in the main frequency band 51 . This main frequency band 51 has a center frequency f 1 . As is the case for all frequency bandwidths, the bandwidth of this frequency band is exaggerated in the figure with respect to the displayed frequency scale. The signal S1 additionally comprises several frequency bands corresponding to harmonics, namely the first harmonic 52 , the second harmonic 53 and the third harmonic 54 shown in the figure. They each have their own frequency center 2f 1 、3f 1 、4f 1 , which are the main frequency band center frequency f1 Integer multiples of ....

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PUM

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Abstract

The present invention relates to a power amplifier device (10), switchable for at least two separate basic frequency bands, for radio frequency signals with effective suppression of harmonics, where harmonics, corresponding to a first basic frequency band, can be permitted to overlap the frequency range of at least one second basic frequency band. The power amplifier device (10) comprises a power amplifier (1) and an impedance matching circuit (2), switchable by means of a PIN-diode, which provides a load impedance adapted to each individual basic frequency band. Furthermore, the power amplifier device comprises a filter device (3) comprising a fixed low-pass filter (3b) and a switchable filter (3b) acting as an engageable and disengageable notch filter, which comprises at least one reversible PIN-diode. This switchable filter (3a) allows to pass, in a first mode, signals in the first basic frequency band and suppresses at the same time at least one order of harmonics corresponding to this basic frequency band. In a second mode, the second basic frequency band is transmitted without appreciable losses, and harmonics are suppressed by the fixed low-pass filter (3a).

Description

field of invention [0001] The invention relates to a device and a method for suppressing, in a radio frequency signal having at least two independent main frequency bands, harmonics corresponding to these main frequency bands. The invention also relates to a power amplifier device for radio frequency signals, which is switchable between at least two independent main frequency bands. Background technique [0002] Most power amplifiers used in high-efficiency RF transmitters operate near saturation, so in addition to generating the desired RF signal frequency, they also generate non-negligible energy to harmonics of this frequency. In power amplifiers designed for only one fixed frequency band, these harmonics are filtered by means of a low-pass filter between the outlet of the power amplifier and the antenna. [0003] Among the harmonics generated, generally the second and third tones are prominent, corresponding to frequencies two or three times...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/193H03F3/72H03H7/01H03H7/38
CPCH03H7/0123H03H7/38H03F3/72H03F3/1935H03H7/1791H03H7/0153H03H7/1775
Inventor T·波林P·-O·布兰德特U·因贝里
Owner TELEFON AB LM ERICSSON (PUBL)
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