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Multimode receiver with complex filter

一种滤波器、射频接收器的技术，应用在调制载波系统、数字传输系统、电气元件等方向，能够解决旁频带增益不对称性等问题

Inactive Publication Date: 2014-09-17
MSTAR SEMICON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Another problem with RF receivers is sideband gain asymmetry

Method used

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  • Multimode receiver with complex filter
  • Multimode receiver with complex filter
  • Multimode receiver with complex filter

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0041] In an embodiment of the present invention, the radio frequency receiver supports multiple wireless transmission standards, such as 2G and 3G. For example, the receiver can support multiple standards without turning off any mixer and / or the clock signal to the mixer.

[0042] An embodiment of the present invention is shown in figure 1 The radio frequency receiver 200, wherein the signal is a differential signal. The front end of the RF receiver 200 includes a low noise amplifier 10 for amplifying the differential RF input signals RFIN1, RFIN2. These radio frequency input signals may be wireless signals received through an antenna (not shown). In this embodiment, these radio frequency input signals are mobile phone signals. These radio frequency input signals may also be television signals received via electrical or fiber optic cables.

[0043] The output of the low noise amplifier 10 is coupled to the first set of mixers 40 through the impedance circuit 20 , and coup...

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PUM

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Abstract

One aspect of the present invention includes a radio frequency (RF) receiver having a first mixer and a second mixer. The first mixer may be an I-mixer and the second mixer a Q-mixer for downconverting the received RF signal. An impedance circuit is disposed between the first mixer and the second mixer to decouple the channels. In another aspect of present invention, the RF receiver includes a digital filter having at least one complex coefficient. The digital filter exhibits asymmetrical frequency response, and may be used to compensate the asymmetrical frequency response of another filter in the RF receiver.

Description

technical field [0001] The present invention relates to radio frequency communication devices, in particular to radio frequency receivers with mixers, such as mobile telephones and wireless area network receivers. Background technique [0002] The present invention is related to US Patent No. 8,121,577, the content of which is incorporated by reference in this application. [0003] A radio frequency receiver included in a radio frequency communication system is used to receive radio frequency signals transmitted through a specific radio frequency channel (eg, through a target center frequency within a target frequency band). One of the functions of an RF receiver is to reject signals with frequencies outside the band of interest. RF signals adjacent to the frequency band of interest are especially difficult to process. [0004] Through a mixer, a super-heterodyning RF receiver mixes the RF signal with a local oscillator signal, thereby down-converting the RF signal into a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04B1/18H04B1/1027H04B1/0067H04B1/123H04L27/2647
Inventor 强纳森·谷温汤玛士·麦可史蒂芬·欧图西罗·瓦兰登
Owner MSTAR SEMICON INC