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Infinite impulse response (IIR) filter and filtering method

An infinite impulse response, filter technology, applied in the direction of transverse filter, N-channel filter, filter, etc., can solve the problems of high static power consumption and increased flicker noise of high-order filter.

Inactive Publication Date: 2013-02-06
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the number of required amplifiers will increase, the static power consumption of high-order filters will be very high
Also, flicker noise increases as more amplifiers are used

Method used

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  • Infinite impulse response (IIR) filter and filtering method
  • Infinite impulse response (IIR) filter and filtering method
  • Infinite impulse response (IIR) filter and filtering method

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Embodiment

[0026] Analog and digital baseband (ADBB) receivers typically operate on signals that occupy a subset of the full operating bandwidth of an RF receiver. Such a subset is called a channel. However, when the RF receiver and RF transmitter are installed on the same communication device, even if the frequency spectrum of the RF receiver and RF transmitter does not overlap, interference from the RF transmitter will still occur during the operation of the RF receiver . Interference outside the channel, especially adjacent interference, can cause serious damage to analog and digital baseband receivers, such as desensitization, intermodulation, intermodulation, saturation, synchronization error, channel equalization error, etc. . Therefore, there is a need to suppress near (out-of-channel) interference to RF receivers.

[0027] figure 1 Shown is a radio frequency receiver 100 according to an embodiment of the present invention. In this embodiment, the radio frequency receiver 100...

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Abstract

An infinite impulse response (IIR) filter is provided. The IIR filter includes an amplifier and a filter coupled in a feedback path of the amplifier. The amplifier generates an output signal according to an input signal. The filter filters the output signal according to a first transfer function and provides the filtered output signal to an input of the amplifier. The IIR filter and the first filter have the same order larger than one.

Description

technical field [0001] The present invention relates to a switched capacitor filter, and in particular to an infinite impulse response (IIR) filter with only one amplifier and a filtering method. Background technique [0002] Filters are typically used to allow desired signal components to pass and attenuate unwanted signal components. Filters are widely used in different applications, such as communication, computer, network, and consumer electronics applications. For example, in a wireless communication device, such as a mobile phone, a filter filters a received signal to allow desired signals within a specific frequency channel to pass and attenuate unwanted signals outside the frequency band. signal and noise. [0003] A switched capacitor filter (SCF) is used for discrete-time signal processing. A switched capacitor filter operates by moving charge into and out of the capacitor when the switch is turned on and off. Typically, non-overlapping signals can be used to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H15/00H03H15/023H03H19/002H03H17/02
Inventor 颜昇宏
Owner MEDIATEK INC
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