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Conduction-cross circuit module and RF filter

A conductive circuit and filter technology, applied in logic circuits, amplifiers with semiconductor devices/discharge tubes, frequency-independent attenuators, etc.

Inactive Publication Date: 2008-01-16
AVAGO TECH WIRELESS IP SINGAPORE PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The latter is designed to give the maximum frequency level with minimum ripple at the filter's bandpass frequency, while the former is designed to behave in essentially the same way, but with a time delay

Method used

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  • Conduction-cross circuit module and RF filter
  • Conduction-cross circuit module and RF filter
  • Conduction-cross circuit module and RF filter

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Embodiment Construction

[0058] This specification discloses one or more embodiments that incorporate the features of this invention. It should be noted that these embodiments and references in this specification to "one embodiment", "an embodiment", "exemplary embodiment" and so on mean that the described embodiment may include certain features, structures or characteristics, but not every embodiment necessarily includes that particular feature, structure or characteristic. Furthermore, these phrases are not necessarily referring to the same embodiment. Also, when a specific feature, structure or characteristic is described in conjunction with a certain embodiment, those skilled in the art should know that these specific features, structures or characteristics can also be combined in other embodiments, whether explicitly stated or not.

[0059] FIG. 3 shows a wireless receiver 300 according to an embodiment of the invention. Wireless receiver 300 includes antenna 305, low noise amplifier (LNA) 310,...

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Abstract

There are various mobile communication standards such as GSM, EDGE, and W-CDMA. For a GSM or EDGE system, a receiver (300) must be configured to work with an IF signal with a center frequency and bandwidth of 200 KHz. For WCDMA system, the same receiver (300) must be configured to work with an IF signal with a center frequency of 600KHz to 1000KHz and band width of 2000KHz. Accordingly, a configurable frequency IF filter with the capability to operate with multiple standards is provided.

Description

technical field [0001] The present invention relates to a reconfigurable / programmable intermediate frequency (IF) filter. Background technique [0002] Many radio frequency (RF) receivers today are superheterodyne receivers. The RF receiver 100 shown in FIG. 1 uses heterodyne principles to down convert and demodulate data from an RF signal. Typically, data will be transmitted using high frequency signals due to the inherent relationship between RF wavelength and antenna size. This high frequency signal used to piggy back lower frequency information signals is called a carrier signal. [0003] In a heterodyne system, the received signal is mixed with another locally generated signal to remove the carrier signal from the transmitted RF signal. This mixing process results in multiple signals in various frequency bands. The frequency band of interest is the intermediate frequency (IF) of the system, which includes the data signal in modulated form. As shown in FIG. 1 , the ...

Claims

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Application Information

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IPC IPC(8): H03H11/04H03K19/00
CPCH03F3/211H03F2203/7209H03F3/72H03H11/04H03F2203/21178H03H11/24H03F2200/111H03F2203/7236
Inventor 李强
Owner AVAGO TECH WIRELESS IP SINGAPORE PTE
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