CN217388656U - Low-noise amplifier circuit with low standing wave ratio - Google Patents
Low-noise amplifier circuit with low standing wave ratio Download PDFInfo
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- CN217388656U CN217388656U CN202221388675.4U CN202221388675U CN217388656U CN 217388656 U CN217388656 U CN 217388656U CN 202221388675 U CN202221388675 U CN 202221388675U CN 217388656 U CN217388656 U CN 217388656U
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Abstract
The utility model provides a low noise amplifier circuit of low standing-wave ratio, include: the fixed end of the first radio frequency switch circuit receives an antenna signal; the input end of the first hybrid bridge circuit is connected with the first movable end of the first radio frequency switch circuit; the input end of the first low-noise amplifier circuit is connected with the coupling end of the first hybrid bridge circuit; the input end of the second low-noise amplifier circuit is connected with the through end of the first hybrid bridge circuit; the coupling end of the second hybrid bridge circuit is connected with the output end of the first low-noise amplifier circuit, and the straight-through end of the second hybrid bridge circuit is connected with the output end of the second low-noise amplifier circuit; the first movable end of the second radio frequency switch circuit is connected with the isolation end of the second hybrid bridge circuit, and the fixed end of the second radio frequency switch circuit outputs an amplified signal; one end of the isolator circuit is connected with the second movable end of the first radio frequency switch circuit, and the other end of the isolator circuit is connected with the second movable end of the second radio frequency switch circuit. The scheme enables the standing wave index to be good no matter in a small signal state or a large signal state.
Description
Technical Field
The utility model belongs to the technical field of the low noise amplifier module technique of receiver front end and specifically relates to a low noise amplifier circuit of low standing-wave ratio is related to.
Background
In radar and communication circuits, the front end of a receiver is provided with a low-noise amplifier module which has the main function of amplifying weak signals received by an antenna, and because the receiver is positioned at the front end with the weakest signal, the noise coefficient of the receiver directly determines the lowest signal power which can be received, namely the sensitivity of a system; meanwhile, when the spatial signal is large, the noise coefficient is no longer important, and the linearity becomes a key index, so that a module which can ensure high sensitivity when the signal is small and ensure linearity when the signal is large is very important, and therefore, a low-noise amplifier circuit with a low standing-wave ratio is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low noise amplifier circuit of low standing-wave ratio to satisfy above-mentioned demand.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low standing wave ratio low noise amplifier circuit comprising: the fixed end of the first radio frequency switch circuit is used for receiving antenna signals; the input end of the first hybrid bridge circuit is connected with the first movable end of the first radio frequency switch circuit, and the isolation end of the first hybrid bridge circuit is grounded through a resistor; a first low noise amplifier circuit, an input end of which is connected with a coupling end of the first hybrid bridge circuit; the input end of the second low-noise amplifier circuit is connected with the through end of the first hybrid bridge circuit; a second hybrid bridge circuit, a coupling end of which is connected with an output end of the first low noise amplifier circuit, a through end of which is connected with an output end of the second low noise amplifier circuit, and an input end of which is grounded through a resistor; the first movable end of the second radio frequency switch circuit is connected with the isolation end of the second hybrid bridge circuit, and the fixed end of the second radio frequency switch circuit is used for outputting an amplified signal; and one end of the isolator circuit is connected with the second movable end of the first radio frequency switch circuit, and the other end of the isolator circuit is connected with the second movable end of the second radio frequency switch circuit.
The utility model discloses an in the embodiment, low noise amplifier circuit of low standing-wave ratio still includes the comparator, the in-phase end of comparator with second radio frequency switch circuit's end of deciding is connected, the inverting terminal of comparator is used for receiving reference voltage, the output of comparator respectively with first radio frequency switch circuit's on-off control end with second radio frequency switch circuit's on-off control end is connected.
In an embodiment of the present invention, the low noise amplifier circuit with low standing-wave ratio further includes a first linear voltage stabilizer, and both the pin VIN and the pin EN of the first linear voltage stabilizer are connected to the fixed end of the second radio frequency switch circuit; and a pin VOUT of the first linear voltage stabilizer is used for outputting a first circuit voltage.
In an embodiment of the present invention, the low noise amplifier circuit with low standing-wave ratio further includes a second linear voltage stabilizer, and a pin VIN of the second linear voltage stabilizer is connected to a fixed end of the second radio frequency switch circuit; and a pin EN of the second linear voltage stabilizer is respectively connected with a switch control end of the first radio frequency switch circuit and a switch control end of the second radio frequency switch circuit, and a pin VOUT of the second linear voltage stabilizer is used for outputting a second circuit voltage.
In an embodiment of the present invention, the first RF switch circuit includes an RF switch U1, a resistor R13, a resistor R14, a capacitor C28, a capacitor C29, a capacitor C30, and a capacitor C31, a pin RFC of the RF switch U1 is used for receiving an antenna signal, a pin VDD of the RF switch U1 is connected to a voltage through the capacitor C30 and the capacitor C31, which are grounded, the pin LS of the RF switch U1 is connected to a voltage through the resistor R14, a pin V1 of the RF switch U1 is connected to one end of the resistor R13 and the capacitor C29, which is grounded, the other end of the resistor R13 is used as a switch control end, a pin RF2 of the RF switch U1 is connected to an input end of the first hybrid bridge circuit, and a pin RF1 of the RF switch U1 is connected to the isolator circuit through the capacitor C28.
IN an embodiment of the present invention, the first hybrid bridge circuit includes a bridge X1, a resistor R2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C14, a capacitor C15, and a capacitor C16, a pin IN of the bridge X1 is connected to a pin RF2 of the RF switch U1, a pin ISO of the bridge X1 is grounded through the resistor R2, a pin COU of the bridge X1 is connected to one end of the capacitor C3 and the capacitor C4 that is grounded, the other end of the capacitor C3 is connected to the input terminal of the first low noise amplifier circuit through the capacitor C5 that is grounded, a pin DIR of the bridge X1 is connected to one end of the capacitor C16 and the capacitor C15 that is grounded, and the other end of the capacitor C16 is connected to the input terminal of the second low noise amplifier circuit through the capacitor C14 that is grounded.
The utility model discloses an in the embodiment, first low noise amplifier circuit with second low noise amplifier circuit integration is two low noise amplifier circuit.
In an embodiment of the present disclosure, the dual low noise amplifier circuit includes a dual low noise amplifier U3, a resistor R1, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, an inductor L1, an inductor L2, an inductor L3, a capacitor C3, a pin RFIN 3 of the dual low noise amplifier U3 is connected to one end of the inductor L3 and the other end of the capacitor C3, the other end of the inductor L3 is connected to one end of the resistor R3 and the other end of the capacitor C3, the other end of the inductor L3 is connected to the capacitor C3, the capacitor C3 is connected to the dual low noise amplifier U3, the dual low noise amplifier as is connected to the ground, the dual low noise amplifier U3 and the other end of the capacitor as 3 is connected to the dual low noise amplifier as 3 and the dual low noise amplifier 3 is connected to the ground The grounded capacitor C25 is connected to the grounded resistor R11, the pin BIAS _ IN1 of the dual low noise amplifier U3 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R9, the grounded capacitor C23, the grounded capacitor C8 and one end of the resistor R4, the other end of the resistor R9 is connected to an external voltage, the other end of the resistor R4 is connected to one end of the inductor L3 and the grounded capacitor C7, the pin RFOUT1 of the dual low noise amplifier U3 is connected to the other end of the inductor L1 and the coupling end of the second hybrid bridge circuit, the pin RFIN1 of the dual low noise amplifier U1 is connected to one end of the inductor L1 and the other end of the capacitor C1, the other end of the inductor L1 is connected to one end of the resistor R1 and the grounded capacitor C1, and the other end of the pin BIAS _ IN the dual low noise amplifier U1 is connected to the ground resistor R1 and the other end of the capacitor C1 And pins VSD2 of the dual low noise amplifier U3 are all connected to the capacitor C20 connected to ground, the capacitor C26 connected to ground, and the resistor R12 connected to ground, pins BIAS _ IN2 of the dual low noise amplifier U3 are connected to one end of the resistor R8, the other end of the resistor R8 is connected to one end of the resistor R10, the capacitor C24 connected to ground, the capacitor C22 connected to ground, and one end of the resistor R7, the other end of the resistor R10 is externally connected to a voltage, the other end of the resistor R7 is connected to one end of the inductor L4 and the capacitor C21 connected to ground, and pins RFOUT2 of the dual low noise amplifier U3 are connected to the other end of the inductor L4 and the through end of the second hybrid bridge circuit.
IN an embodiment of the present disclosure, the second hybrid bridge circuit includes a bridge X2, a resistor R5, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C17, a capacitor C18, and a capacitor C19, a pin IN of the bridge X2 is grounded through the resistor R5, a pin ISO of the bridge X2 is connected to the first moving terminal of the second rf switch circuit, pins COU of the bridge X2 are all connected to one end of the capacitor C9 and the grounded capacitor C11, the other end of the capacitor C9 is connected to a pin RFOUT1 of the dual low noise amplifier U3 through the grounded capacitor C10, a pin DIR of the bridge X2 is all connected to one end of the capacitor C19 and the grounded capacitor C17, and the other end of the capacitor C19 is connected to a pin RFOUT2 of the dual low noise amplifier U3 through the grounded capacitor C18.
In an embodiment of the present disclosure, the second RF switch circuit includes an RF switch U2, a resistor R2, a capacitor C2, an inductor L2, a magnetic bead FB 2, and a connector J2, a pin VDD of the RF switch U2 is externally connected to a voltage through the capacitor C2 connected to ground and the capacitor C2 connected to ground, a pin LS of the RF switch U2 is externally connected to a voltage through the resistor R2, a pin V2 of the RF switch U2 is connected to one end of the resistor R2 and the capacitor C2 connected to ground, the other end of the resistor R2 serves as a switch control terminal, a pin RF2 of the RF switch U2 is connected to an ISO pin of the bridge X2, a pin of the RF switch U2 is connected to the isolator, and a pin of the RFC switch U2 is connected to an end of the capacitor C2 connected to ground, the other end of the capacitor C33 is connected to one end of the inductor L5, the grounded capacitor C36 and the connector J1, the other end of the inductor L5 is connected to the grounded capacitor C37 and one end of the magnetic bead FB3, and the other end of the magnetic bead FB3 is connected to the grounded capacitor C34 and the grounded capacitor C35 to serve as an RX _ OUT _ DC terminal.
To sum up, the utility model discloses following beneficial effect has at least:
in the utility model, when the antenna signal is small, the antenna signal is input through the first radio frequency switch circuit by the cooperation of the first radio frequency switch circuit and the second radio frequency switch circuit, and is divided into two paths of signals through the first mixed bridge circuit, and the two paths of signals are respectively amplified through the first low noise amplifier circuit and the second low noise amplifier circuit, so that the overall linearity is improved, and the amplified signal is output through the second radio frequency switch circuit through the second mixed bridge circuit; the first hybrid bridge circuit and the second hybrid bridge circuit can respectively reduce the standing-wave ratio of the antenna signal input port and the standing-wave ratio of the amplified signal output port; when the antenna signal is large, the first radio frequency switch circuit is matched with the second radio frequency switch circuit, so that the antenna signal is input through the first radio frequency switch circuit and is output through the second radio frequency switch circuit after passing through the isolator circuit; the isolator circuit effectively reduces the standing wave coefficient (low standing wave ratio) of input and output; therefore, the low-noise amplifier circuit with the low standing wave ratio has a good standing wave index (low standing wave ratio) no matter in a small signal state or a large signal state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a low noise amplifier circuit with a low standing wave ratio according to some embodiments of the present invention.
Fig. 2 is a schematic circuit diagram of a first rf switch circuit and a first hybrid bridge circuit according to some embodiments of the present invention.
Fig. 3 is a circuit schematic diagram of a first low noise amplifier circuit and a second low noise amplifier circuit according to some embodiments of the present invention.
Fig. 4 is a circuit schematic diagram of a second rf switch circuit and a second hybrid bridge circuit according to some embodiments of the present invention.
Fig. 5 is a circuit schematic of an isolator circuit according to some embodiments of the present invention.
Fig. 6 is a schematic circuit diagram of a comparator according to some embodiments of the present invention.
Fig. 7 is a circuit diagram of a first linear regulator according to some embodiments of the present invention.
Fig. 8 is a circuit diagram of a second linear regulator according to some embodiments of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the embodiments of the present invention, it should be understood that the terms "length," "vertical," "horizontal," "top," "bottom," and the like are used in the orientation and positional relationship shown in the drawings for convenience in describing the embodiments of the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the embodiments of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features through another feature not in direct contact. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the present embodiment provides a low noise amplifier circuit with a low standing wave ratio, including: the fixed end of the first radio frequency switch circuit is used for receiving antenna signals; the input end of the first hybrid bridge circuit is connected with the first movable end of the first radio frequency switch circuit, and the isolation end of the first hybrid bridge circuit is grounded through a resistor; the input end of the first low-noise amplifier circuit is connected with the coupling end of the first hybrid bridge circuit; the input end of the second low-noise amplifier circuit is connected with the through end of the first hybrid bridge circuit; the coupling end of the second hybrid bridge circuit is connected with the output end of the first low-noise amplifier circuit, the direct-through end of the second hybrid bridge circuit is connected with the output end of the second low-noise amplifier circuit, and the input end of the second hybrid bridge circuit is grounded through a resistor; the first movable end of the first radio frequency switch circuit is connected with the isolation end of the first hybrid bridge circuit, and the fixed end of the first radio frequency switch circuit is used for outputting an amplified signal; and one end of the isolator circuit is connected with the second movable end of the first radio frequency switch circuit, and the other end of the isolator circuit is connected with the second movable end of the second radio frequency switch circuit.
In some embodiments, the low noise amplifier circuit with low standing wave ratio further includes a comparator, a non-inverting terminal of the comparator is connected to the fixed terminal of the second rf switch circuit, an inverting terminal of the comparator is configured to receive the reference voltage, and an output terminal of the comparator is connected to the switch control terminal of the first rf switch circuit and the switch control terminal of the second rf switch circuit, respectively.
In some embodiments, the low noise amplifier circuit with low standing wave ratio further includes a first linear regulator, and both a pin VIN and a pin EN of the first linear regulator are connected to the fixed end of the second rf switch circuit; the pin VOUT of the first linear regulator is used to output a first circuit voltage.
In some embodiments, the low noise amplifier circuit with low standing wave ratio further includes a second linear voltage regulator, a pin VIN of the second linear voltage regulator is connected to a fixed end of the second rf switch circuit; and a pin EN of the second linear voltage stabilizer is respectively connected with a switch control end of the first radio frequency switch circuit and a switch control end of the second radio frequency switch circuit, and a pin VOUT of the second linear voltage stabilizer is used for outputting the voltage of the second circuit.
In some embodiments, as shown in fig. 2, the first RF switch circuit includes an RF switch U1, a resistor R13, a resistor R14, a capacitor C28, a capacitor C29, a capacitor C30, and a capacitor C31, a pin RFC of the RF switch U1 is used for receiving an antenna signal, a pin VDD of the RF switch U1 is externally connected with a voltage through a grounded capacitor C30 and a grounded capacitor C31, a pin LS of the RF switch U1 is externally connected with a voltage through a resistor R14, pins V1 of the RF switch U1 are connected with one end of the resistor R13 and the grounded capacitor C29, the other end of the resistor R13 serves as a switch control terminal, a pin RF2 of the RF switch U1 is connected with an input terminal of the first hybrid bridge circuit, and a pin RF1 of the RF switch U1 is connected with an isolator circuit (a pin P1 of the isolator G1) through a capacitor C28.
IN some embodiments, as shown IN fig. 2, the first hybrid bridge circuit includes a bridge X1, a resistor R2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C14, a capacitor C15, and a capacitor C16, a pin IN of the bridge X1 is connected to a pin RF2 of the RF switch U1, a pin ISO of the bridge X1 is grounded through the resistor R2, pins COU of the bridge X1 are connected to one end of the capacitor C3 and the grounded capacitor C4, the other end of the capacitor C3 is connected to an input terminal of the first low noise amplifier circuit through the grounded capacitor C5, a pin DIR of the bridge X1 is connected to one end of the capacitor C16 and the grounded capacitor C15, and the other end of the capacitor C16 is connected to an input terminal of the second low noise amplifier circuit through the grounded capacitor C14.
In some embodiments, the first low noise amplifier circuit and the second low noise amplifier circuit are integrated into a dual low noise amplifier circuit.
In some embodiments, as shown in fig. 3, the dual low noise amplifier circuit includes a dual low noise amplifier U3, a resistor R1, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, an inductor L11, a capacitor C11, and a capacitor C11, wherein the pin RFIN 11 of the dual low noise amplifier U11 is connected to one end of the inductor L11 and the other end of the capacitor C11, the other end of the capacitor VSD 11 of the dual low noise amplifier U11 is connected to one end of the resistor L11 and the other end of the capacitor as 11 of the capacitor U11, the pin of the capacitor as 11 is connected to the ground, and the other end of the resistor U11 of the capacitor b 11 is connected to the capacitor b 11 of the capacitor b 11, pin BIAS _ IN1 of dual low noise amplifier U3 is connected to one end of resistor R3, the other end of resistor R3 is connected to one end of resistor R9, grounded capacitor C23, grounded capacitor C8 and one end of resistor R8, the other end of resistor R8 is connected to external voltage, the other end of resistor R8 is connected to one end of inductor L8 and grounded capacitor C8, pin RFOUT 8 of dual low noise amplifier U8 is connected to the other end of inductor L8 and the coupling end of the second hybrid bridge circuit, pin RFIN 8 of dual low noise amplifier U8 is connected to one end of inductor L8 and the other end of capacitor C8, the other end of inductor L8 is connected to one end of resistor R8 and grounded capacitor C8, pin BIAS _ OUT 8 of dual low noise amplifier U8 is connected to the other end of resistor R8 and grounded capacitor C8, and capacitors VSD 8 of dual low noise amplifier U8 are connected to ground and capacitors 8, ground. A pin BIAS _ IN2 of the dual low noise amplifier U3 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with one end of a resistor R10, a grounded capacitor C24, a grounded capacitor C22 and one end of a resistor R7, the other end of the resistor R10 is externally connected with voltage, the other end of the resistor R7 is connected with one end of an inductor L4 and a grounded capacitor C21, and a pin RFOUT2 of the dual low noise amplifier U3 is connected with the other end of the inductor L4 and a through end of the second hybrid bridge circuit.
IN some embodiments, as shown IN fig. 4, the second hybrid bridge circuit includes a bridge X2, a resistor R5, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C17, a capacitor C18, and a capacitor C19, a pin IN of the bridge X2 is grounded through a resistor R5, a pin ISO of the bridge X2 is connected to the first moving end of the second rf switch circuit, pins COU of the bridge X2 are connected to one end of the capacitor C9 and the grounded capacitor C11, the other end of the capacitor C9 is connected to a pin RFOUT1 of the dual low noise amplifier U3 through a grounded capacitor C10, a pin DIR of the bridge X2 is connected to one end of a capacitor C19 and the grounded capacitor C17, and the other end of the capacitor C19 is connected to a pin RFOUT2 of the dual low noise amplifier U3 through a grounded capacitor C18.
In some embodiments, as shown in fig. 4, the second RF switch circuit includes an RF switch U, a resistor R, a capacitor C, an inductor L, a magnetic bead FB, and a connector J, a pin VDD of the RF switch U is externally connected to a voltage via the grounded capacitor C and the grounded capacitor C, a pin LS of the RF switch U is externally connected to a voltage via the resistor R, a pin V of the RF switch U is connected to one end of the resistor R and the grounded capacitor C, the other end of the resistor R serves as a switch control terminal, a pin RF of the RF switch U is connected to a pin ISO of the bridge X, a pin RF of the RF switch U is connected to an isolator circuit (pin P of the isolator G), a pin RFC of the RF switch U is connected to one end of the grounded capacitor C and one end of the capacitor C, and the other end of the capacitor C is connected to one end of the inductor L, a pin b, The grounded capacitor C36 is connected to the connector J1, the other end of the inductor L5 is connected to one end of the grounded capacitor C37 and one end of the magnetic bead FB3, and the other end of the magnetic bead FB3 is connected to the grounded capacitor C34 and the grounded capacitor C35 to serve as an RX _ OUT _ DC terminal.
In summary, other devices not described and connections not described are shown in fig. 2 to 8; models and parameter settings of the respective devices are as shown in fig. 2 to 8;
the external voltage can be set according to actual requirements, and as shown in fig. 2 to 8, the external voltage can be 3V or 4.8V; the radio frequency switch U1 and the radio frequency switch U2 can be of the type PE 42422;
clearly, when an antenna signal is small, the antenna signal is input through the radio frequency switch U1 by matching the radio frequency switch U1 with the radio frequency switch U2, and is divided into two paths of signals through the bridge X1, the two paths of signals are respectively amplified through the dual low noise amplifier U3, the overall linearity of low noise is improved, and a reflected signal of the dual low noise amplifier U3 is absorbed by a 50 Ω matching resistor (resistor R2) of the bridge X1, so that the standing-wave ratio of the antenna signal input port is reduced; the amplified signal passes through the bridge X2 and is output through the radio frequency switch U2, and the reflected wave at the output end is absorbed by a 50 omega matching resistor (resistor R5) of the bridge X2, so that the standing wave ratio of the output port of the amplified signal is reduced;
when the antenna signal is large, the radio frequency switch U1 is matched with the radio frequency switch U2, so that the antenna signal is input through the radio frequency switch U1, passes through the isolator G1 and is output through the radio frequency switch U2, and the isolator G1 effectively reduces the standing wave coefficient (low standing wave ratio) of input and output; therefore, the low-noise amplifier circuit with the low standing wave ratio has a good standing wave index (low standing wave ratio) no matter in a small signal state or a large signal state.
The rf switch U1 and the rf switch U2 can be switched by the comparator U4, the first linear regulator U5 and the second linear regulator U6 can provide the operating voltage, and when the signal is switched to the branch of the isolator G1, the power supply of the dual low noise amplifier U3 is simultaneously turned off, so the power supply of the dual low noise amplifier U3 is also simultaneously controlled.
The utility model provides an innovation thinking realizes high dynamic range through the switch switching, and the mode through isolator, electric bridge and double-circuit amplifier improves the standing-wave ratio. When the signal is small, the signal is switched to a low noise amplifier circuit, the signal is amplified by the low noise amplifier, and the standing-wave ratio performance is improved in an electric bridge shunting and combining way; when the signal is large, the signal is switched to a direct path, and the standing-wave ratio performance is improved through the isolator. Meanwhile, the low standing wave bit performance improves the matching degree of the low noise amplifier module, the antenna and a subsequent circuit, further reduces signal loss, and improves the sensitivity and the consistency of products.
The above embodiments describe a plurality of specific embodiments of the present invention, but it should be understood by those skilled in the art that various changes or modifications may be made to these embodiments without departing from the principles and spirit of the present invention, and these changes and modifications all fall into the protection scope of the present invention.
Claims (10)
1. A low noise amplifier circuit with a low standing wave ratio, comprising:
the fixed end of the first radio frequency switch circuit is used for receiving antenna signals;
the input end of the first hybrid bridge circuit is connected with the first movable end of the first radio frequency switch circuit, and the isolation end of the first hybrid bridge circuit is grounded through a resistor;
a first low noise amplifier circuit, an input end of which is connected with a coupling end of the first hybrid bridge circuit;
the input end of the second low-noise amplifier circuit is connected with the through end of the first hybrid bridge circuit;
a second hybrid bridge circuit, a coupling end of which is connected with an output end of the first low noise amplifier circuit, a through end of which is connected with an output end of the second low noise amplifier circuit, and an input end of which is grounded through a resistor;
the first movable end of the second radio frequency switch circuit is connected with the isolation end of the second hybrid bridge circuit, and the fixed end of the second radio frequency switch circuit is used for outputting an amplified signal;
and one end of the isolator circuit is connected with the second movable end of the first radio frequency switch circuit, and the other end of the isolator circuit is connected with the second movable end of the second radio frequency switch circuit.
2. The low-noise amplifier circuit with low standing-wave ratio of claim 1, further comprising a comparator, wherein a non-inverting terminal of the comparator is connected to the fixed terminal of the second rf switch circuit, an inverting terminal of the comparator is configured to receive a reference voltage, and output terminals of the comparator are respectively connected to the switch control terminal of the first rf switch circuit and the switch control terminal of the second rf switch circuit.
3. The low standing-wave ratio low noise amplifier circuit according to claim 1, further comprising a first linear regulator, wherein a pin VIN and a pin EN of the first linear regulator are connected to a fixed terminal of the second rf switch circuit; and a pin VOUT of the first linear voltage stabilizer is used for outputting a first circuit voltage.
4. The low standing wave ratio low noise amplifier circuit according to claim 1, further comprising a second linear regulator, wherein a pin VIN of the second linear regulator is connected to a fixed terminal of the second rf switching circuit; and a pin EN of the second linear voltage stabilizer is respectively connected with a switch control end of the first radio frequency switch circuit and a switch control end of the second radio frequency switch circuit, and a pin VOUT of the second linear voltage stabilizer is used for outputting a second circuit voltage.
5. The low standing wave ratio low noise amplifier circuit of claim 1, the first radio frequency switch circuit comprises a radio frequency switch U1, a resistor R13, a resistor R14, a capacitor C28, a capacitor C29, a capacitor C30 and a capacitor C31, the pin RFC of the radio frequency switch U1 is used for receiving antenna signals, the pin VDD of the radio frequency switch U1 is externally connected with voltage through the capacitor C30 which is grounded and the capacitor C31 which is grounded, the pin LS of the radio frequency switch U1 is externally connected with voltage through the resistor R14, the pin V1 of the radio frequency switch U1 is connected with one end of the resistor R13 and the grounded capacitor C29, the other end of the resistor R13 is used as a switch control end, a pin RF2 of the radio frequency switch U1 is connected with the input end of the first hybrid bridge circuit, the pin RF1 of the radio frequency switch U1 is connected to the isolator circuit through the capacitor C28.
6. The low standing wave ratio low noise amplifier circuit of claim 5, the first hybrid bridge circuit comprises a bridge X1, a resistor R2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C14, a capacitor C15 and a capacitor C16, the pin IN of the bridge X1 is connected with the pin RF2 of the radio frequency switch U1, the pin ISO of the bridge X1 is grounded through the resistor R2, the pins COU of the bridge X1 are all connected to one end of the capacitor C3 and the capacitor C4 which is connected to ground, the other end of the capacitor C3 is connected to the input of the first low noise amplifier circuit through the capacitor C5 which is connected to ground, pins DIR of the bridge X1 are each connected to one end of the capacitor C16 and the capacitor C15 which is connected to ground, the other end of the capacitor C16 is connected to the input of the second low noise amplifier circuit through the capacitor C14, which is connected to ground.
7. The low standing wave ratio low noise amplifier circuit of claim 6, wherein the first low noise amplifier circuit and the second low noise amplifier circuit are integrated as a dual low noise amplifier circuit.
8. The low standing wave ratio lna circuit according to claim 7, wherein the dual low noise amplifier circuit comprises a dual low noise amplifier U3, a resistor R1, a resistor R3, a resistor R4, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C5, a capacitor C6, a capacitor C7 and a capacitor C7, wherein the pin n 7 of the dual low noise amplifier U7 is connected to one end of the inductor L7 and the other end of the capacitor C7, the other end of the inductor L7 is connected to the resistor as 7 and the other end of the resistor R7, and the other end of the resistor as 7 are connected to the ground, and the other end of the resistor as 7 and the resistor OUT of the dual low noise amplifier U7 are connected to the ground, the VSD1 of the dual low noise amplifier U3 is connected to the capacitor C6 connected to ground, the capacitor C25 connected to ground and the resistor R11 connected to ground, the BIAS _ IN1 of the dual low noise amplifier U3 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R9, the capacitor C23 connected to ground, the capacitor C8 connected to ground and one end of the resistor R4, the other end of the resistor R9 is connected to external voltage, the other end of the resistor R4 is connected to one end of the inductor L3 and the capacitor C7 connected to ground, the RFOUT1 of the dual low noise amplifier U3 is connected to the other end of the inductor L1 and the coupling end of the second hybrid bridge circuit, the pin n1 of the dual low noise amplifier U1 is connected to one end of the inductor L1 and the capacitor R1 connected to ground, pin BIAS _ OUT2 of the dual low noise amplifier U3 is connected to the other end of the resistor R6 and the capacitor C13 connected to ground, pin VSD2 of the dual low noise amplifier U3 is connected to the capacitor C20 connected to ground, the capacitor C26 connected to ground and the resistor R12 connected to ground, pin BIAS _ IN2 of the dual low noise amplifier U3 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to one end of the resistor R10, the capacitor C24 connected to ground, the capacitor C22 connected to ground and one end of the resistor R7 connected to ground, the other end of the resistor R10 is connected to external voltage, the other end of the resistor R7 is connected to one end of the inductor L4 and the capacitor C21 connected to ground, and pin RFOUT2 of the dual low noise amplifier U3 is connected to the other end of the inductor L4 and the bridge terminal of the second hybrid circuit.
9. The low standing wave ratio low noise amplifier circuit of claim 8, the second hybrid bridge circuit comprises a bridge X2, a resistor R5, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C17, a capacitor C18 and a capacitor C19, the pin IN of the electric bridge X2 is grounded through the resistor R5, the pin ISO of the electric bridge X2 is connected with the first movable end of the second radio frequency switch circuit, the pins COU of the bridge X2 are all connected to one end of the capacitor C9 and the capacitor C11 which is connected to ground, the other end of the capacitor C9 is connected to pin RFOUT1 of the dual low noise amplifier U3 through the capacitor C10 connected to ground, pins DIR of the bridge X2 are each connected to one end of the capacitor C19 and the capacitor C17 which is connected to ground, the other end of the capacitor C19 is connected to pin RFOUT2 of the dual low noise amplifier U3 through the capacitor C18, which is connected to ground.
10. The low standing wave ratio low noise amplifier circuit as claimed in claim 9, wherein the second RF switch circuit comprises an RF switch U2, a resistor R15, a resistor R29, a capacitor C32, a capacitor C33, a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a capacitor C40, an inductor L5, a magnetic bead FB3 and a connector J1, a pin VDD of the RF switch U2 is externally connected with a voltage through the capacitor C39 connected to ground and the capacitor C40 connected to ground, a pin LS of the RF switch U2 is externally connected with a voltage through the resistor R15, a pin V1 of the RF switch U2 is connected with one end of the resistor R29 and the capacitor C38 connected to ground, the other end of the resistor R29 is used as a switch control terminal, a pin RF1 of the RF switch U2 is connected with a pin of the ISO X2, and a pin of the RF switch U2 is connected with the RF2 of the RF switch circuit, the pins RFC of the radio frequency switch U2 are all connected to one ends of the capacitors C32 and C33, which are grounded, the other end of the capacitor C33 is all connected to one end of the inductor L5, the capacitor C36, which is grounded, and the connector J1, the other end of the inductor L5 is all connected to one ends of the capacitors C37 and the magnetic bead FB3, which are grounded, and the other end of the magnetic bead FB3 is connected to the capacitors C34, which are grounded, and the capacitor C35, which is grounded, and then serves as an RX _ OUT _ DC terminal.
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| CN202221388675.4U CN217388656U (en) | 2022-06-06 | 2022-06-06 | Low-noise amplifier circuit with low standing wave ratio |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221388675.4U CN217388656U (en) | 2022-06-06 | 2022-06-06 | Low-noise amplifier circuit with low standing wave ratio |
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