A Current Mode RF Bandpass Filter
A filter and radio frequency band technology, which is applied in the field of radio frequency front end of wireless receiver and current mode radio frequency bandpass filter, can solve the problem of poor noise performance, limited switch on-resistance and load order of N-phase filter, and lack of gain etc. to achieve high blocking rejection ratio and good out-of-band matching
Active Publication Date: 2022-02-01
SOUTHEAST UNIV
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Problems solved by technology
Among the above four schemes, the first two essentially construct on-chip RF bandpass filters to eliminate the influence of blocking signals, but the way of using the feedforward active cancellation structure is limited by the matching problem, and the feedback active cancellation structure is limited by the stability N-phase filter is limited by switch on-resistance and load order, it is difficult to obtain ideal filter characteristics
The current-mode structure based on the passive mixer avoids large signal swings by constructing low-impedance nodes to achieve better blocking tolerance. The structure without low-noise amplifier avoids amplifying the blocking signal by removing the low-noise amplifier. This structure has Extremely high blocking tolerance (linearity can reach more than 25dBm), the filtering of blocking in these two structures is done in the intermediate frequency circuit, but due to the lack of gain, especially the structure without low noise amplifier, its noise performance poor
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[0025] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0026] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein Explanation.
[0027] The technical scheme adopted in the present invention is:
[0028] Two kinds of transconductance units with different frequency selection characteristics are constructed through feedback; the input voltage is converted into current through the transconductance unit, and the circuit works ...
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The invention discloses a current mode radio frequency bandpass filter, which belongs to the field of integrated circuits. The RF filter consists of an all-pass transconductance unit and a band-stop transconductance unit. The input signal passes through the input transconductance source series resistance and N-phase filter to construct all-pass and band-stop characteristics; the input voltage is converted into current through the transconductance unit, and the circuit works in current mode, which can effectively avoid large voltage Swing amplitude; the two currents at the output end are reversely superimposed to form a radio frequency bandpass filter, which can filter out blockage and amplify the signal. The current radio frequency filter is applied in a silent surface radio frequency receiver. Compared with other RF bandpass filters, the current RF filter can withstand stronger out-of-band blocking interference and higher blocking rejection rate.
Description
technical field [0001] The invention relates to a current mode radio frequency bandpass filter, which is applied to the radio frequency front end of a wireless receiver without an off-chip surface acoustic filter, and belongs to the field of integrated circuits. Background technique [0002] In the receiver RF front-end without off-chip SAW filter, due to the lack of off-chip filtering, blocking signals in other frequency bands and signals in the receiving frequency band will be received by the front-end at the same time. The strength of the blocking signal is generally much stronger than that of the receiving signal, so how to tolerate the blocking signal (to prevent the blocking signal from affecting the normal reception signal of the RF front-end) and how to filter the blocking signal (to prevent the blocking signal from affecting the subsequent stage) become two problems that the system must solve question. In view of these problems, the current main solutions are: usin...
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IPC IPC(8): H03H11/38
CPCH03H11/38
Inventor吴建辉金锦陈超李红
OwnerSOUTHEAST UNIV