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Radio frequency amplifier with reduced intermodulation distortion

A technology for amplifying stages and amplifying signals, which is applied in the field of broadband amplification devices, can solve problems such as reducing battery life, and achieve the effects of easy implementation and low power requirements

Inactive Publication Date: 2005-03-16
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it is not desirable to increase the power consumption of the amplifier in the device, as this would reduce the life of the battery used to run the device, or reduce the number of cycles the battery must be charged

Method used

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  • Radio frequency amplifier with reduced intermodulation distortion
  • Radio frequency amplifier with reduced intermodulation distortion
  • Radio frequency amplifier with reduced intermodulation distortion

Examples

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Embodiment Construction

[0037] refer to figure 1 A device 6 for amplifying a signal (eg, a portable radio receiver such as a cellular telephone) includes a receiver input 8, an amplifier 10, a receiver output 12, and a power source 14 (eg, a battery). Receiver input 8 is used to receive an electromagnetic signal 16 (eg, a signal with a frequency greater than 100 MHz, and possibly a signal with a frequency greater than 500 MHz) from a transmitter 18 and to generate an electrical signal 20 . Amplifier 10 receives signal 20 and sends an amplified signal 22 to receiver output 12, which converts amplified signal 22 into an appropriate output signal 24 (eg, a phonetic representation of a human voice).

[0038] Although in figure 1Only one electromagnetic signal 16 is shown in , but receiver input 8 typically receives other signals (different frequencies). As noted above, when two or more tones are received at receiver input 8, the amplified signal 22 will contain intermodulation products that may interfe...

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PUM

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Abstract

Apparatus and methods of broadband amplification with high linearity and low power consumption are described. An apparatus configured to amplify a signal includes an input transistor and an output transistor coupled together in a cascode configuration with the input transistor defining an input of the amplifier and the output transistor defining an output of the amplifier. A feedback network is coupled between the input and the output and is characterized by an impedance of substantially zero resistance and non-zero reactance. A method of amplifying a signal is also described. An input signal is received at an input; the input signal is amplified to provide an output signal at an output; and the output signal is sampled at the input through a feedback network characterized by an impedance of substantially zero resistance and ion-zero reactance. A method of making an apparatus configured to amplify a signal is also described.

Description

technical field [0001] The present invention generally relates to apparatus and methods for broadband amplification with high linearity and low power consumption. Background technique [0002] Broadband signal amplifiers and methods for amplifying signals over a wide frequency range have many uses. For example, wireless communication devices such as cellular phones, cordless phones, pagers, TV tuners, local area networks, etc. require wide dynamic range, highly linear amplifiers to amplify the strength of received signals without distortion and crosstalk between different frequencies. Unfortunately, however, all linear amplifiers distort the signal being amplified to some extent. This is especially troublesome when two or more independent channels are to be amplified. In these situations, the amplifier will generate unwanted intermodulation products that can cause interference and degrade the performance of the communications equipment. [0003] Intermodulation distortion...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F1/02H03F1/22H03F1/34
CPCH03F1/34H03F1/22H03F2201/3215
Inventor 约翰尼斯·J·E·M·哈格拉茨
Owner MURATA MFG CO LTD
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