High-linearity radio-frequency front end suitable for nano-scale technology

A radio frequency front-end, nano-scale technology, applied in the network using time-varying components, electrical components, impedance networks, etc., can solve the problem of unsatisfactory harmonic suppression capability of the receiver, achieve flexible gain configuration, clear circuit principle, The effect of low power consumption

Inactive Publication Date: 2011-09-28
PEKING UNIV
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Problems solved by technology

[0006] Patent documents US20100317311A1 and EP2270982A2 are based on impedance change technology and adopt a unified LO frequency to realize a RF front-end without SAW filter and strong anti-interference ability, but the harmonic suppression ability of the architecture receiver is not ideal

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  • High-linearity radio-frequency front end suitable for nano-scale technology
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  • High-linearity radio-frequency front end suitable for nano-scale technology

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Embodiment Construction

[0032] The specific implementation scheme of the high frequency selective radio frequency front end of the present invention is as follows:

[0033] figure 1 is a timing chart of the local oscillator signal used in the present invention. For N (N=4,8) LO signals, the LO signal is required to be a square wave, the duty cycle of each signal is (1 / N), and the delay is 1 / N cycles in turn. figure 1 Taking 4 LO signals as an example, all 4 signals are required to have a 25% duty cycle, and each channel is relatively delayed by 1 / 4 cycle. Taking 8 LO signals as an example, all LO signals are required to have a duty cycle of 12.5%, and each channel is relatively delayed by 1 / 8 cycle.

[0034] figure 2 It is a schematic diagram of the transformation effect of the NMOS switch on the baseband impedance in the frequency domain. baseband impedance Z BB at a frequency of f 0 and satisfied figure 1 Shifts occur in the frequency domain under the switching action of the desired LO si...

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Abstract

The invention provides a high-frequency-selectivity radio-frequency front end suitable for nano-scale. The front end comprises a high-frequency input matching network, a lower-noise transconductor, a load network and a passive frequency mixer, wherein the passive frequency mixer is arranged on an output node of the input matching network or the low-noise transconductor or the load network; impedance conversion is adopted by the input matching network and the load network to realize high Q values and high frequency selectivity for filtering out-of-band interference; a radio-frequency signal is filtered by using the high-Q-value input matching network, and is then amplified by using the transconductor and the load of the high-Q-value load network which is subjected impedance conversion; a high-frequency signal is converted to a low-frequency signal by performing down-conversion with the passive frequency mixer for processing with an analog or digital baseband. The radio-frequency front end has the advantages of low power consumption, high image rejection ratio, high out-of-band linearity, strong gain configurability, no need of off-chip SAW (Surface Acoustic Wave) filter and the like, and is suitable for application to a future multifunctional integrated radio-frequency chip.

Description

technical field [0001] The invention relates to a high-linearity radio frequency front end of software radio suitable for nanoscale technology, belonging to the field of radio frequency integrated circuits. Background technique [0002] Software-Defined Radio (SDR), as an expected general-purpose radio frequency transceiver, has become an important direction of research and industry attention. [0003] The functions of personal mobile terminals tend to be diversified. For example, some current smart phones already include functions such as 2G, 3G communication, Bluetooth communication, Wi-Fi and digital mobile TV. For mobile terminals compatible with multiple communication standards, the current mainstream solution is to use different chips for different standards, and add a high-Q surface acoustic wave (Surface acoustic wave, SAW) filter behind the antenna to pre-filter interference signals Then the useful signal is processed. The disadvantage of this scheme is that the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H19/00
Inventor 王川陈龙叶乐廖怀林黄如
Owner PEKING UNIV
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