CN219761021U - Isolation improved radio frequency transceiver circuit - Google Patents
Isolation improved radio frequency transceiver circuit Download PDFInfo
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- CN219761021U CN219761021U CN202321116702.7U CN202321116702U CN219761021U CN 219761021 U CN219761021 U CN 219761021U CN 202321116702 U CN202321116702 U CN 202321116702U CN 219761021 U CN219761021 U CN 219761021U
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- local oscillator
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- radio frequency
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- 238000002955 isolation Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 230000010355 oscillation Effects 0.000 claims description 32
- 230000007547 defect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 101100184147 Caenorhabditis elegans mix-1 gene Proteins 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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Abstract
The utility model discloses an isolation improved radio frequency transceiver circuit, which comprises a transmitting channel, a local oscillator channel and a receiving channel which share a local oscillator circuit, wherein the transmitting channel comprises a first intermediate frequency band-pass filter, a first intermediate frequency signal amplifier, an up-conversion mixer, a first radio frequency band-pass filter and a power amplifier; the receiving channel comprises a low-noise amplifier, a second radio frequency band-pass filter, a down-conversion mixer, a second intermediate frequency band-pass filter and a second intermediate frequency signal amplifier; the local oscillator channel comprises a signal generator, a power divider, a first local oscillator amplifier, a second local oscillator amplifier, a first local oscillator filter, a second local oscillator filter and the like. The utility model improves the defects of the existing radio frequency transceiver component, effectively blocks the medium frequency transmission channel, increases the isolation between the transceiver channels, achieves better signal isolation effect, and can ensure the miniaturization design requirement of devices.
Description
Technical Field
The utility model relates to the technical field of radio frequency transceiver circuits, in particular to an isolation improved radio frequency transceiver circuit.
Background
At present, in the system design of a miniaturized microwave component, a time-sharing scheme of receiving and transmitting is generally adopted to solve the problem, or the design of increasing the isolation degree of the microwave component, separating the receiving and transmitting local oscillators and the like is adopted, and the measures can block the connection between the receiving and transmitting channels to a certain extent and separate the receiving and transmitting channels in space, but the volume and the power consumption of a module are increased, so that the design is a great test for miniaturization.
In the conventional scheme design, the local oscillators shared by the receiving and transmitting channels are usually amplified by using a power divider to divide the power into two paths, and then the receiving and transmitting channel mixers are driven, the isolation of the local oscillator channels is mainly determined by the isolation of the power divider, the LO/IF isolation of the superimposed receiving channel and the LO/RF isolation of the transmitting channel form the initial isolation of the channel, and for the receiving and transmitting system, the received radio frequency signals are usually very small in amplitude and amplified by a front-end low-noise amplifier and a rear-stage intermediate-frequency amplifier, and at the moment, even IF the lower-amplitude radio frequency signals leaked from the transmitting channel can generate great interference to the receiving channel.
Disclosure of Invention
In order to solve the defects of the prior art, the utility model aims to provide an isolation improved radio frequency transceiver circuit which improves the defects of the existing radio frequency transceiver component, effectively blocks a medium frequency transmission channel, increases the isolation between the transceiver channels, achieves a better signal isolation effect and can ensure the miniaturization design requirement of devices.
In order to achieve the above object, the present utility model adopts the following technical scheme:
the isolation improved radio frequency transceiver circuit is characterized by comprising a local oscillator channel, and a transmitting channel and a receiving channel sharing the local oscillator channel, wherein the transmitting channel and the receiving channel are arranged on two sides of the local oscillator channel,
the transmitting channel comprises a first intermediate frequency band-pass filter, a first intermediate frequency signal amplifier, an up-conversion mixer (Mix 1), a first radio frequency band-pass filter and a power amplifier;
the receiving channel comprises a low-noise amplifier, a second radio frequency band-pass filter, a down-conversion mixer, a second intermediate frequency band-pass filter and a second intermediate frequency signal amplifier;
the local oscillator channel comprises a signal generator, a power divider, a first local oscillator amplifier, a second local oscillator amplifier, a first local oscillator filter and a second local oscillator filter;
the power divider is used for dividing the signals generated by the signal generator into two paths of same local oscillation signals, one path of signals is transmitted to the up-conversion mixer of the transmitting channel through the first local oscillation amplifier and the first local oscillation filter, and the other path of signals is transmitted to the down-conversion mixer of the receiving channel through the second local oscillation amplifier and the second local oscillation filter.
Preferably, the first local oscillation filter and the second local oscillation filter are both narrow-band local oscillation filters.
Preferably, the first local oscillation filter and the second local oscillation filter are respectively wide-band tunable filters of SIF056 to SIF062 series.
The utility model has the advantages that:
the utility model can realize high receiving and transmitting isolation, meets the index of high receiving sensitivity, and is suitable for the scenes of sharing receiving and transmitting local oscillators, requiring miniaturization, low power consumption and the like.
Drawings
Fig. 1 is a schematic structural diagram of an isolation improved rf transceiver circuit according to a first embodiment.
Detailed Description
The utility model is described in detail below with reference to the drawings and the specific embodiments.
Example 1
As shown in fig. 1, this embodiment proposes an isolation-improved radio frequency transceiver circuit, which includes a local oscillation channel, and a transmitting channel and a receiving channel sharing the local oscillation channel, the transmitting channel and the receiving channel being disposed on two sides of the local oscillation channel,
the transmitting channel comprises a first intermediate frequency band-pass filter BPF_Tx_IF, a first intermediate frequency signal amplifier Amp_Tx_IF, an up-conversion mixer Mix1, a first radio frequency band-pass filter BPF_Tx_RF and a power amplifier PA_Tx;
the receiving channel comprises a low-noise amplifier LNA_Rx, a second radio frequency band-pass filter BPF_Rx_RF, a down-conversion mixer Mix2, a second intermediate frequency band-pass filter BPF_Rx_IF and a second intermediate frequency signal amplifier Amp_Rx_IF;
the local oscillator channel comprises a signal generator, a power divider PD, a first local oscillator amplifier Amp1, a second local oscillator amplifier Amp2, a first local oscillator filter F1 and a second local oscillator filter F2;
the power divider PD is configured to divide a signal generated by the signal generator into two identical local oscillation signals, one of which is transmitted to the up-conversion mixer Mix1 of the transmitting channel through the first local oscillation amplifier Amp1 and the first local oscillation filter F1, and the other of which is transmitted to the down-conversion mixer Mix2 of the receiving channel through the second local oscillation amplifier Amp2 and the second local oscillation filter F2.
The first local oscillation filter and the second local oscillation filter both adopt narrow-band local oscillation filters, and the principle of realizing crosstalk signal isolation is as follows:
after improvement, when the crosstalk signals of the transmitting channels pass through the local oscillator channels, the crosstalk signals pass through the two stages of band-pass filters on the local oscillator channels successively, and the suppression degree of each stage of band-pass filter on the intermediate frequency and the radio frequency signals can reach more than 35 dB. When the amplitude of the received input signal is-70 dBc, the transmitted interference signal reaching the receiving channel through the comprehensive two-stage filtering is very low, and the inhibition degree can reach 105dB. Even if the input signal is-95 dBm, the interference rejection degree can still reach 80dB, and the use requirement of the system can be met.
The scheme is applicable to a narrow-band receiving and transmitting system due to the limitation of the bandwidth of a filter, has a strong isolation effect on signals which are subjected to crosstalk through a local oscillator channel, can meet the requirement of realizing high receiving and transmitting isolation indexes of various systems, and can also play a guiding role in debugging the isolation indexes of the existing systems.
The improved transceiver component scheme provided by the utility model realizes high transceiver isolation and high receiving sensitivity index, has great design advantages for the scene of sharing the transceiver local oscillator and requiring miniaturization and low power consumption, performs index analysis on the primary frequency conversion system, can design the secondary or multiple frequency conversion system according to the scheme, and can also realize high isolation index.
In order to further expand the radio frequency band, the local oscillation filter can be a wide band tunable filter, which is more helpful to expansion design. If SIF056 to SIF062 series electrically tunable filters are adopted, the series electrically tunable filters can be used for filtering in an octave way, and the series electrically tunable filters can cover 2-20GHz to ensure ultra-wideband isolation.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the utility model in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the utility model.
Claims (3)
1. The isolation improved radio frequency transceiver circuit is characterized by comprising a local oscillator channel, and a transmitting channel and a receiving channel sharing the local oscillator channel, wherein the transmitting channel and the receiving channel are arranged on two sides of the local oscillator channel,
the transmission channel includes a first intermediate frequency band-pass filter (bpf_tx_if), a first intermediate frequency signal amplifier (amp_tx_if), an up-conversion mixer (Mix 1), a first radio frequency band-pass filter (bpf_tx_rf), and a power amplifier (pa_tx);
the receiving channel comprises a low noise amplifier (LNA_Rx), a second radio frequency band-pass filter (BPF_Rx_RF), a down-conversion mixer (Mix 2), a second intermediate frequency band-pass filter (BPF_Rx_IF) and a second intermediate frequency signal amplifier (Amp_Rx_IF);
the local oscillator channel comprises a signal generator, a Power Divider (PD), a first local oscillator amplifier (Amp 1), a second local oscillator amplifier (Amp 2), a first local oscillator filter (F1) and a second local oscillator filter (F2);
the Power Divider (PD) is used for dividing the signals generated by the signal generator into two paths of same local oscillation signals, one path of signals is transmitted to the up-conversion mixer (Mix 1) of the transmitting channel through the first local oscillation amplifier (Amp 1) and the first local oscillation filter (F1), and the other path of signals is transmitted to the down-conversion mixer (Mix 2) of the receiving channel through the second local oscillation amplifier (Amp 2) and the second local oscillation filter (F2).
2. The isolation improved radio frequency transceiver circuit of claim 1, wherein: the first local oscillation filter (F1) and the second local oscillation filter (F2) are narrow-band local oscillation filters.
3. The isolation improved radio frequency transceiver circuit of claim 1, wherein: the first local oscillation filter (F1) and the second local oscillation filter (F2) are wide band tunable filters of SIF056 to SIF062 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321116702.7U CN219761021U (en) | 2023-05-10 | 2023-05-10 | Isolation improved radio frequency transceiver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321116702.7U CN219761021U (en) | 2023-05-10 | 2023-05-10 | Isolation improved radio frequency transceiver circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219761021U true CN219761021U (en) | 2023-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321116702.7U Active CN219761021U (en) | 2023-05-10 | 2023-05-10 | Isolation improved radio frequency transceiver circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219761021U (en) |
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2023
- 2023-05-10 CN CN202321116702.7U patent/CN219761021U/en active Active
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