Disclosure of Invention
The invention aims to provide a wireless data transmission radio station to solve the problems of large volume and low integration level of the existing data transmission radio station.
The invention discloses a wireless data transmission radio station, which comprises a Micro Control Unit (MCU), a modulator, a frequency synthesizer, a multi-band power amplifier, an A/D (analog/digital) converter/demodulator, a mixer, a broadband low noise amplifier, a first N-way switch, a second N-way switch, a 2N-way switch, a transmitting channel filtering unit comprising N filters and a receiving channel filtering unit comprising N filters, wherein N is more than or equal to 2, and
the output end of the modulator is connected with the input end of the frequency synthesizer;
one output end of the frequency synthesizer is connected with the input end of the multi-band power amplifier, and the other output end of the frequency synthesizer is connected with one input end of the mixer;
the output end of the multi-band power amplifier is connected with the movable end of the first N-path switch;
the fixed end of the first N-way switch is respectively connected with the input end of each filter in the transmitting channel filtering unit;
the output end of each filter in the transmitting channel filtering unit is respectively connected with N fixed ends of the 2N-path switch;
the other N fixed ends of the 2N-path switch are respectively connected with the input end of each filter in the receiving channel filtering unit; the movable end is connected with the antenna;
the output end of each filter in the receiving channel filtering unit is respectively connected with the immobile end of the second N-way switch;
the moving end of the second N-way switch is connected with the input end of the broadband low-noise amplifier;
the output end of the broadband low noise amplifier is connected with the input end of the mixer;
the output end of the frequency mixer is connected with the input end of the A/D converter/demodulator;
the MCU is respectively connected with the modulator, the A/D converter/demodulator, the first N-way switch, the second N-way switch and the 2N-way switch and is used for controlling the modulator to generate baseband signals and simultaneously controlling the first N-way switch and the 2N-way switch to be switched on according to a frequency band to be transmitted in a transmitting state; and controlling the second N-way switch and the 2N-way switch according to the frequency band to be received in a receiving state.
Preferably, the first N-way switch, the second N-way switch, and the 2N-way switch are all rf switches.
Preferably, each filter in the transmit channel filtering unit is a low-pass filter; and each filter in the receiving channel filtering unit is a band-pass filter.
The wireless data transmission radio station can work in a plurality of frequency bands including UHF frequency band (410-.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in FIG. 1, the functional block diagram of the wireless data transmission station of the present invention comprises an MCU01, a modulator 02, a frequency synthesizer 03, a multi-band power amplifier 04, an A/D converter/demodulator 05, a mixer 06, a wideband low noise amplifier 07, a first N-way switch 08, a second N-way switch 09, a 2N-way switch 10, a transmit channel filtering unit 11 including N filters, and a receive channel filtering unit 12 including N filters, wherein N is greater than or equal to 2, and N is greater than or equal to 2
The output end of the modulator 02 is connected with the input end of the frequency synthesizer 03;
one output end of the frequency synthesizer 03 is connected with the input end of the multi-band power amplifier 04, and the other output end is connected with the input end of the mixer 06;
the output end of the multi-band power amplifier 04 is connected with the moving end of the first N-way switch 08;
the fixed end of the first N-way switch 08 is respectively connected with the input end of each filter in the transmitting channel filtering unit 11; namely, one fixed end is connected with the input end of one filter; a total of N sets of connections;
the output ends of N filters in the transmitting channel filtering unit 11 are respectively connected with N fixed ends of the 2N-path switch 10; namely, the output end of each filter is connected with one of the fixed ends of the 2N switches; the total N groups are connected, and the other similar reasons are adopted;
the other N fixed ends of the 2N-way switch 10 are respectively connected with the input end of each filter in the receiving channel filtering unit 12; the movable end is connected with the antenna;
the output end of each filter in the receiving channel filtering unit 12 is connected with the immobile end of the second N-way switch 09;
the moving end of the second N-way switch 09 is connected with the input end of the broadband low noise amplifier 07;
the output end of the broadband low-noise amplifier 07 is connected with the input end of the mixer 06;
the output end of the mixer 06 is connected with the input end of the A/D converter/demodulator 05;
the MCU01 is respectively connected to the modulator 02, the a/D converter/demodulator 05, the first N-way switch 08, the second N-way switch 09, and the 2N-way switch 10, and is configured to control the modulator 02 to generate a baseband signal in a transmitting state, and simultaneously control the first N-way switch 08 and the 2N-way switch 10 to be turned on according to a frequency band to be transmitted; and in the receiving state, controlling the conduction of the second N-way switch 09 and the 2N-way switch 10 according to the frequency band to be received; in the invention, each filter of the transmitting path and the receiving path is respectively responsible for filtering signals of one frequency band.
FIG. 2 is a schematic block diagram illustrating an embodiment of the wireless data transfer station of the present invention that can operate in the frequency ranges of 220-240MHz and 410-470 MHz; that is to say, the radio station of this embodiment can only operate in the frequency bands of 220-470 MHz and 410-470MHz, as shown in the figure, the radio station includes an MCU01, a modulator 02, a frequency synthesizer 03, a multi-band power amplifier 04, an a/D converter/demodulator 05, a mixer 06, a wideband low noise amplifier 07, a first single-pole double-throw switch 080, a second single-pole double-throw switch 090, a single-pole four-throw switch 100, a first filter 110, a second filter 111, a third filter 120 and a fourth filter 121, where the first filter 110 and the second filter 111 constitute a transmit channel filtering unit 11; the third filter 120 and the fourth filter 121 constitute a receiving channel filter unit 12; in this embodiment, the first filter 110 and the second filter 111 are low-pass filters; the third filter 120 and the fourth filter 121 are band pass filters; the first single-pole double-throw switch 080, the second single-pole double-throw switch 090 and the single-pole four-throw switch 100 are all radio frequency switches; wherein,
the output end of the modulator 02 is connected with the input end of the frequency synthesizer 03;
one output end of the frequency synthesizer 03 is connected with the input end of the multi-band power amplifier 04, and the other output end is connected with the input end of the mixer 06;
the output end of the multi-band power amplifier 04 is connected with the moving end of the first single-pole double-throw switch 080;
the fixed end of the first single-pole double-throw switch 080 is connected with the input ends of the first filter 110 and the second filter 1111 respectively;
the output ends of the first filter 110 and the second filter 111 are respectively connected with two of the fixed ends of the single-pole four-throw switch 100;
the other two fixed ends of the single-pole four-throw switch 100 are respectively connected with the input ends of the third filter 120 and the fourth filter 121; the movable end is connected with the antenna;
the output ends of the third filter 120 and the fourth filter 121 are connected to the stationary end of the second single-pole double-throw switch 090;
the moving end of the second single-pole double-throw switch 090 is connected with the input end of the broadband low noise amplifier 07;
the output end of the broadband low-noise amplifier 07 is connected with the input end of the mixer 06;
the output end of the mixer 06 is connected with the input end of the A/D converter/demodulator 05;
the MCU01 is respectively connected to the modulator 02, the a/D converter/demodulator 05, the first spdt switch 080, the second spdt switch 090, and the spdt switch 100, and is configured to control the modulator 02 to generate a baseband signal in a transmitting state, and simultaneously control the first spdt switch 080 spdt switch 100 to turn on according to a frequency band to be transmitted; and in the receiving state, controlling the connection state of the second single-pole double-throw switch 090 and the single-pole four-throw switch 100 according to the frequency band to be received.
When the radio station is in a transmitting state, the MCU01 controls the modulator 02 to generate a baseband signal, and simultaneously controls the conduction states of the first single-pole double-throw switch 080 and the single-pole four-throw switch 100 according to the current frequency band to be transmitted to form a radio frequency transmitting channel; the modulator 02 transmits the generated baseband signal to the frequency synthesizer 03; the frequency synthesizer 03 generates a radio frequency signal of a transmission frequency band and sends the radio frequency signal to the multiband power amplifier 04; the multi-band power amplifier 04 amplifies the radio frequency signal, and then filters the harmonic wave generated by the power amplifier through different filters according to different transmission frequency bands, and transmits the harmonic wave to the antenna for transmission.
When the radio station is in a receiving state, the MCU01 controls the on-state of the second single-pole double-throw switch 090 and the single-pole four-throw switch 100 to form a radio frequency receiving channel; the antenna receives radio frequency signals, the radio frequency signals are filtered by the third filter 120 or the fourth filter 121 and amplified by the broadband low noise amplifier 07, then frequency mixing processing is carried out at the frequency mixer 06, local oscillation signals of the frequency mixer 06 are generated by the frequency synthesizer 03, the received radio frequency signals are converted into baseband signals after frequency mixing, then the baseband signals are converted by the A/D converter/demodulator 05 and then are subjected to digital demodulation, and the baseband signals are sent to the MCU01 to complete receiving demodulation of the signals.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept described herein, as determined by the above teachings or as determined by the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.