CN108337010B - Radio frequency receiver based on carrier wave reinforcing technology - Google Patents
Radio frequency receiver based on carrier wave reinforcing technology Download PDFInfo
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- CN108337010B CN108337010B CN201810005577.XA CN201810005577A CN108337010B CN 108337010 B CN108337010 B CN 108337010B CN 201810005577 A CN201810005577 A CN 201810005577A CN 108337010 B CN108337010 B CN 108337010B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
The invention discloses a radio frequency receiver based on a carrier wave reinforcement technology, which belongs to the technical field of electronic circuits and comprises: antenna, alternating current source, time varying transmission line, duplexer, 50Ohm load, DC bias, low noise amplifier, power amplifier. Wherein the upper transmission line of the time-varying transmission line is used for propagating the received signal and the transmitted signal, and the lower transmission line propagates the carrier. The two transmission lines are connected in parallel with the abrupt junction varactor group at equal intervals and are used for mixing the carrier wave and the received signal. The lower transmission line and the ground are connected with the MOS varactor group in parallel at equal intervals and used for increasing the amplitude of the carrier wave. The radio frequency receiver based on the carrier enhancement technology can realize high gain of a received signal in a wider frequency band, makes up the loss problem of a traditional time-varying transmission line after the traditional time-varying transmission line enters high frequency, reduces the requirement on a post-stage duplexer, reduces post-stage noise at the same time, and further improves the overall noise of a system.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a radio frequency receiver based on a carrier enhancement technology.
Background
The high isolation and low noise of the time-varying transmission line adopting the Distributed Modulation Capacitor (DMC) structure show the potential advantages of the application in the front end of a full-duplex transceiver. In a time-varying transmission line, the signals received and transmitted by the antenna are at the same frequency, but the propagation directions are different. The signal received from the antenna is modulated by the carrier in the transmission process to the transmitter because the propagation direction is the same as the carrier; and the transmission signal is directly transmitted to the antenna due to the reverse propagation direction, and only causes little interference to the DMC. The variable capacitance diodes which are connected in parallel at equal intervals among transmission lines and are modulated by carriers not only enable the time-varying transmission lines to have non-reciprocity, but also realize full-duplex communication; and meanwhile, the device also plays a role of a mixer, and reduces the requirements on the duplexer for down-conversion of the received signals. However, in the conventional time-varying transmission line, the frequency conversion gain is positive at a low frequency, and is negative after the frequency reaches 0.6GHz, and the frequency conversion loss increases with further increase of the frequency. Although the passive network has the advantage of low noise, for the noise of the whole system, when the frequency conversion gain is continuously reduced or even is negative, the noise of the later stage is amplified, and further the whole noise is increased. The above problem is solved by feeding back the received signal at the output terminal to the input terminal, but only a high gain in a narrow band can be achieved.
Disclosure of Invention
In view of the above, the present invention provides a radio frequency receiver architecture based on carrier enhancement technology to overcome the loss problem of the conventional time-varying transmission line and to achieve high gain in a wider frequency band.
In order to achieve the purpose, the invention provides the following technical scheme:
a radio frequency receiver based on carrier enhancement technology, comprising:
an antenna (A) for receiving and transmitting co-frequency signals;
an alternating current source (B) for outputting a carrier signal;
a time-varying transmission line (C) comprising an upper transmission line for propagating a received signal and a transmitted signal, and a lower transmission line for propagating a carrier; the input end of the upper transmission line is connected with an antenna (A), and the input end of the lower transmission line is connected with an alternating current source (B) of the carrier; a first varactor group (C) is connected in parallel between the upper transmission line and the lower transmission line1) A second varactor group (C) is connected in parallel between the lower transmission line and the ground2)；
The input end of the duplexer (D) is connected with the output end of the upper transmission line in the time-varying transmission line (C) and is used for separating the receiving signal and the transmitting signal after down-conversion; the second varactor diode group (C)2) Each varactor in the series circuit is a varactor formed by MOS source-drain short circuits;
the input end of the 50Ohm load (E) is connected with the output end of the lower transmission line in the time-varying transmission line (C);
a direct current bias (F) for providing a reverse bias voltage to the varactor diode within the time-varying transmission line (C);
a low noise amplifier (G) having an input coupled to the RX output of the duplexer (D) for amplifying the down-converted received signal;
and the input end of the power amplifier (H) is connected with the TX output end of the duplexer (D) and is used for carrying out power amplification on the transmitting signal.
Based on the above scheme, the present invention can further adopt a plurality of following preferred modes:
the first changeCapacitor diode group (C)1) The varactors in (1) are equally spaced in parallel between the upper and lower transmission lines.
The second varactor diode group (C)2) The varactors in (1) are equally spaced in parallel between the lower transmission line and ground.
The first varactor diode group (C)1) Each varactor in (1) is a abrupt junction varactor.
The first varactor diode group (C)1) And a second varactor group (C)2) The variable capacitance diodes are the same in number and are connected to the lower transmission lines in a one-to-one correspondence manner.
Compared with the prior art, according to the radio frequency receiver based on the carrier enhancement technology, the MOS varactor diodes connected in parallel to the lower transmission line of the time-varying transmission line have the functions of charging and storing, so that the carrier transmitted to a load has a higher amplitude, the frequency conversion gain of a received signal is increased while frequency mixing is performed, the problem of loss caused by previous transmission on the time-varying transmission line is solved, and the noise of the next stage cannot be expanded. Because of adopting the periodic parallel MOS varactor structure, the band-pass filter has the characteristics of low dispersion degree and wide frequency band, and can realize high gain in a wider frequency band.
Drawings
FIG. 1 is a schematic diagram of a conventional time-varying transmission line;
FIG. 2 is a schematic diagram of a time-varying transmission line based on carrier enhancement of the present invention; in the figure: omegasRepresenting the received signal, ωcRepresenting a carrier modulated signal, omegac-sRepresenting the down conversion of the received signal;
fig. 3 is an internal schematic diagram of an abrupt junction varactor;
FIG. 4 is an internal schematic diagram of a varactor constructed from MOS transistors;
FIG. 5 shows simulation results of the time-varying transmission line of the present invention and the conventional time-varying transmission line.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
Referring to fig. 2, a radio frequency receiver architecture based on a carrier enhancement technique includes an antenna (a), an alternating current source (B), a time-varying transmission line (C), a duplexer (D), a 50Ohm load (E), a low noise amplifier (G), and a power amplifier (H). Wherein:
an antenna (A) for receiving and transmitting co-frequency signals;
an alternating current source (B) for outputting a carrier signal;
the time-varying transmission line (C) comprises an upper transmission line, a lower transmission line and two groups of varactor diode groups, wherein the upper transmission line is used for transmitting a received signal and a transmitted signal, and the lower transmission line is used for transmitting a carrier wave; the input end of the upper transmission line is connected with an antenna (A), and the input end of the lower transmission line is connected with an alternating current source (B) of the carrier; a first varactor group (C) is connected in parallel between the upper transmission line and the lower transmission line1) A second varactor group (C) is connected in parallel between the lower transmission line and the ground2). And the first varactor diode group (C)1) And a second varactor group (C)2) The number of the variable capacitance diodes is N, two groups of variable capacitance diodes are arranged at equal intervals, and the variable capacitance diodes are connected to the lower transmission line in a one-to-one correspondence mode. The number of N is determined according to practical conditions, and most N is preferable.
The input end of the duplexer (D) is connected with the output end of the upper transmission line in the time-varying transmission line (C) and is used for separating the receiving signal and the transmitting signal after down-conversion;
the input end of the 50Ohm load (E) is connected with the output end of the lower transmission line in the time-varying transmission line (C), and the other end of the 50Ohm load (E) is grounded;
a direct current bias (F) for providing a reverse bias voltage to the varactor in the time-varying transmission line (C), the other end of which is grounded;
a low noise amplifier (G) having an input coupled to the RX output of the duplexer (D) for amplifying the down-converted received signal;
and the input end of the power amplifier (H) is connected with the TX output end of the duplexer (D) and is used for carrying out power amplification on the transmitting signal.
A first varactor diode group (C)1) Each varactor in (1) is a abrupt junction varactor. Referring to fig. 3, which is an internal schematic diagram of an abrupt junction varactor, LsFor packaging inductors, RsIs a series equivalent resistance of a PN junction, CpThe two ends of the tube capacitor need to be added with reverse voltage to control the capacitance change.
Second varactor diode group (C)2) Each varactor in the series circuit is a varactor formed by MOS source-drain short circuits. Referring to fig. 4, an internal schematic diagram of the MOS varactor is shown, in which a source terminal (S) is short-circuited with a drain terminal (D), and is connected to a substrate (B) and then grounded, so that a varactor is formed between a gate (G) and ground, and a reverse voltage is applied to both ends of the varactor to control capacitance change.
Compared with the traditional time-varying transmission line, the invention is characterized in that a second varactor group (C) is added between the lower transmission line and the ground2). The working principle of the invention is as follows:
in the time-varying transmission line, a transmission signal is directly transmitted to an antenna due to the fact that the propagation direction is opposite to the carrier wave, only small interference is caused to DMC, and the signal received from the antenna is modulated by the carrier wave in the transmission process of the signal to a transmitter due to the fact that the propagation direction is the same as the carrier wave. The abrupt junction varactor group plays a role in down-conversion of received signals, so that the received and transmitted signals are at different frequencies, and can be separated by a duplexer at the transmitting end of a transmission line. The invention adds a parallel MOS varactor group (namely C)2Referring to the inner part of the frame in fig. 2), the MOS transistor is shorted through the source and drain, and a capacitance value C is formed between the gate and the ground1A varactor diode. After charging, when the switch is turned off, the charge is stored in the variable capacitance diode, and the total charge is Q ═ C1V1. With the switch continuously closed, the capacitor is controlled by C1Is reduced to C0The voltage on the varactor is increased to V0＝V1C1/C0＞V1The device plays a role in amplifying the amplitude of the carrier, so that the frequency conversion gain of the received signal is increased, and the bandwidth is enlarged.
In order to visually demonstrate the difference between the present invention and the conventional time-varying transmission line, the conventional time-varying transmission line shown in fig. 1 and the time-varying transmission line of the present invention shown in fig. 2 are simulated.
The conventional time-varying transmission line structure is shown in fig. 1, and the parameters are: on a Rogers 4350b substrate of 1 ounce copper clad with a plate dielectric constant of 3.66 and a thickness of 0.254mm, the line width of the upper transmission line was 0.91mm, the line width of the lower transmission line was 0.44mm, and the spacing between the parallel diodes was 7.29 mm. The direct current bias power supply is 0.05V; the carrier power is 20dBm, and the frequency is 1.92 GHz; the power of the received signal is-10 dBm, the power of the transmitted signal is 10dBm, the received signal and the transmitted signal have the same frequency, and the simulation is carried out in the range of 0.25-1.1 GHz.
The time-varying transmission line structure of the present invention is shown in fig. 2, and the parameters are: on a Rogers 4350b substrate of 1 ounce copper clad with a plate dielectric constant of 3.66 and a thickness of 0.254mm, the line width of the upper transmission line was 0.91mm, the line width of the lower transmission line was 0.44mm, and the spacing between the parallel diodes was 7.29 mm. The direct current bias power supply is 0.05V; the carrier power is 20dBm, and the frequency is 1.92 GHz; the power of the received signal is-10 dBm, the power of the transmitted signal is 10dBm, the received signal and the transmitted signal have the same frequency, and the simulation is carried out in the range of 0.25-1.1 GHz.
The simulation results of the two are shown in fig. 5, which can show that: compared with the traditional structure, the invention improves the gain and enlarges the bandwidth. The dotted line in the figure represents a conventional time-varying transmission line, the gain decreases sharply when the signal frequency is greater than 0.5GHz and is always negative after 0.6 GHz; the solid line in the figure represents the time-varying transmission line of the present invention, and the down-conversion gain of the time-varying transmission line is positive in the whole simulation frequency band, wherein the gain is relatively flat and maintained at about 7dB between 0.3 and 0.8 GHz.
Therefore, compared with the prior art, the invention increases the frequency conversion gain of the received signal, makes up the loss problem of the traditional time-varying transmission line after the transmission line enters high frequency, reduces the requirement on the duplexer, reduces the noise of the later stage at the same time, and further improves the overall noise of the system. The periodic parallel structure also has the characteristics of low dispersion degree and wide frequency band.
The foregoing detailed description is provided to illustrate the invention and to enable any person skilled in the art to make or use the invention, and not to limit the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and any modifications and variations to the present invention are within the spirit of the invention and the scope of the claims and fall within the scope of the invention.
Claims (1)
1. A radio frequency receiver based on carrier enhancement technology, comprising:
an antenna (A) for receiving and transmitting co-frequency signals;
an alternating current source (B) for outputting a carrier signal;
a time-varying transmission line (C) comprising an upper transmission line for propagating a received signal and a transmitted signal, and a lower transmission line for propagating a carrier; the input end of the upper transmission line is connected with an antenna (A), and the input end of the lower transmission line is connected with an alternating current source (B) of the carrier; a first varactor group (C) is connected in parallel between the upper transmission line and the lower transmission line1) A second varactor group (C) is connected in parallel between the lower transmission line and the ground2) (ii) a The second varactor diode group (C)2) Each varactor in the series circuit is a varactor formed by MOS source-drain short circuits;
the duplexer (D), its input end couples to carry-out terminal of the upper transmission line in the time-varying transmission line (C) while receiving the signal, used for separating the received signal after the frequency down-conversion and transmitting the signal;
the input end of the 50Ohm load (E) is connected with the output end of the lower transmission line in the time-varying transmission line (C);
a direct current bias (F) for providing a reverse bias voltage to the varactor diode within the time-varying transmission line (C);
a low noise amplifier (G) having an input coupled to the RX output of the duplexer (D) for amplifying the down-converted received signal;
the output end of the power amplifier (H) is connected with the TX input end of the duplexer (D) and is used for carrying out power amplification on the transmitting signal;
the first varactor diode group (C)1) The variable capacitance diodes in the upper transmission line and the lower transmission line are connected in parallel at equal intervals;
the second varactor diode group (C)2) The variable capacitance diodes in the lower transmission line are connected in parallel at equal intervals with the ground;
the first varactor diode group (C)1) Each varactor in (1) is a abrupt junction varactor;
the first varactor diode group (C)1) And a second varactor group (C)2) The variable capacitance diodes are the same in number and are connected to the lower transmission lines in a one-to-one correspondence manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810005577.XA CN108337010B (en) | 2018-01-03 | 2018-01-03 | Radio frequency receiver based on carrier wave reinforcing technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810005577.XA CN108337010B (en) | 2018-01-03 | 2018-01-03 | Radio frequency receiver based on carrier wave reinforcing technology |
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| CN108337010A CN108337010A (en) | 2018-07-27 |
| CN108337010B true CN108337010B (en) | 2020-02-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1303956A2 (en) * | 2000-07-27 | 2003-04-23 | Lynk Labs, Inc. | Current mode transmission |
| JP4026593B2 (en) * | 2003-12-25 | 2007-12-26 | セイコーエプソン株式会社 | Receiver |
| TWI373925B (en) * | 2004-02-10 | 2012-10-01 | Tridev Res L L C | Tunable resonant circuit, tunable voltage controlled oscillator circuit, tunable low noise amplifier circuit and method of tuning a resonant circuit |
| US10027306B2 (en) * | 2014-12-02 | 2018-07-17 | The Regents Of The University Of California | Non-reciprocal, tunable notch amplifying RF front-ends based on distributedly modulated capacitors (DMC) |
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