Radio frequency receiving front-end circuit based on coupling structure
By introducing a coupling structure and a common-source cascode amplifier module into the RF receiver front-end circuit, the problems of increased size and cost of the RF receiver front-end circuit under multi-band interference are solved, achieving circuit miniaturization and low cost while improving impedance matching effect.
Patent Information
- Application Number
- CN202423069407.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing RF receiver front-end circuits face challenges in reducing size and cost, especially when dealing with multi-band interference, where traditional methods lead to increased circuit size and cost.
A coupling structure is used to connect the receiving filter and the low-noise amplifier through inductive coupling, which reduces the circuit area, and the signal is amplified by a common source cascode amplifier module, thereby improving the impedance matching effect.
This achieves a reduction in the size and cost of the RF receiver front-end circuit, while improving the impedance matching performance of the filter and low-noise amplifier.
Smart Images
Figure CN223514891U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a wireless communication field especially is radio frequency receives front end circuit. BACKGROUND
[0002] Radio frequency receives front end circuit is the core component of wireless communication terminal, is located the intermediate position of antenna and transceiver chip, plays signal amplification, filter, channel switching's effect, in recent years along with the rapid development of wireless communication terminal, its integrated function is more and more, and then requires radio frequency receives front end circuit to reduce size as far as possible, however due to the interference frequency band of wireless communication increasing, the requirement of radio frequency receives front end circuit's receiving filter is higher and higher, and it is more and more difficult to reduce the size of radio frequency front end circuit, adopts advanced integrated circuit manufacturing technology, multilayer substrate technology etc. SUMMARY
[0003] Therefore, in order to solve the above problems in the prior art, the utility model provides a radio frequency receives front end circuit based on coupling structure, by connecting the filter and low noise amplifier in radio frequency receives front end circuit in the way of coupling, reduce the size of overall radio frequency receives front end circuit, reduce cost, and improve the impedance matching effect between filter and low noise amplifier.
[0004] To achieve the above object, the technical scheme of the utility model is as follows:
[0005] A radio frequency receives front end circuit based on coupling structure, comprising receiving filter, low noise amplifier.
[0006] Further, the receiving filter comprises a first parallel resonator, a first parallel inductor, a first series capacitor, a first series resonator, a second series capacitor, and a second series resonator.
[0007] Further, the first parallel resonator is connected to the input end of the filter and the first parallel inductor, the first series resonator is connected to the first series capacitor and the second series capacitor, and the second series resonator is connected to the second series capacitor and the output end of the filter.
[0008] Through the above circuit structure, the first parallel resonator, the first series resonator, and the second series resonator are used to filter out signals of three different interference frequency bands, and the first parallel inductor, the first series capacitor, and the second series capacitor are used to complete impedance matching of the receiving filter.
[0009] Further, the low noise amplifier comprises a common source amplification module circuit and a common gate amplification module circuit, the common source amplification module circuit comprises a first serial inductor, a first transistor, a first feed resistor, a first feed capacitor, a first ground inductor, the common gate amplification module circuit comprises a second transistor, a second feed resistor, a second feed capacitor, a first output inductor, a second output inductor, a first output capacitor, the drain of the first transistor of the common source amplification module circuit is connected with the source of the second transistor of the common gate amplification module circuit.
[0010] Further, the first serial inductor is connected with the input of the low noise amplifier and the first feed resistor, the gate of the first transistor is connected with the first feed resistor, the source of the first transistor is connected with the first ground inductor, the drain of the first transistor is connected with the source of the second transistor, the gate of the second transistor is connected with the second feed resistor, the drain of the second transistor is connected with the ground output inductor and the second output inductor, and the first output capacitor is connected with the second output inductor and the output of the low noise amplifier.
[0011] Through the above circuit structure, the common source amplification circuit module and the common gate amplification circuit module constitute a common source common gate amplification circuit to realize signal amplification.
[0012] Further, the third inductor of the receiving filter and the first serial inductor of the low noise amplifier are connected in a winding coupling mode.
[0013] Through the above circuit structure, the overall size of the radio frequency receiving front end can be reduced by one inductor area, and the cost is reduced, and in addition, the filter and the low noise amplifier can obtain better impedance matching effect.
[0014] Compared with the prior art, the radio frequency receiving front end circuit based on the coupler structure has the following beneficial effects and advantages:
[0015] (1) The circuit is connected in a coupling mode, and the circuit size is small
[0016] (2) The circuit is connected in a coupling mode, and the cost is reduced
[0017] (3) The circuit is connected in a coupling mode, and the inter-stage impedance matching effect of the filter and the low noise amplifier is better BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a principle diagram of the radio frequency receiving front end circuit based on the coupling structure of the utility model
[0019] Figure 2 It is a two inductor layout of the coupling structure of the utility model
[0020] Figure 3Two-inductor circuit layout for traditional structure
[0021] Figure 4 Voltage gain result of the utility model DETAILED DESCRIPTION
[0022] The utility model will be further explained in combination with the drawings and specific embodiments. It should be pointed out that the described embodiments are only a part of the embodiments of the utility model, not all embodiments, all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.
[0023] As Figure 1 A radio frequency receiving front-end circuit based on coupling structure, comprising receiving filter 1, low noise amplifier 2, the radio frequency receiving front-end circuit is connected through input and output interface in the order of receiving filter 1, low noise amplifier 2.
[0024] The receiving filter 1 includes first parallel resonator 11, first parallel inductor 12, first series capacitor 13, first series resonator 14, second series capacitor 15, second series resonator 16, the first parallel resonator 11 is formed by the parallel connection of first inductor 111 and first capacitor 112, the first series resonator 14 is formed by the series connection of second inductor 141 and second capacitor 142, and the second series resonator 16 is formed by the series connection of third inductor 161 and third capacitor 162.
[0025] Preferably, the first parallel resonator 11 is connected to the input end of the receiving filter 1 and the first parallel inductor 12, the first series resonator 14 is connected to the first series capacitor 13 and the second series capacitor 15, and the second series resonator 16 is connected to the second series capacitor 15 and the output end of the receiving filter 1.
[0026] Preferably, the low noise amplifier 2 includes a common-source amplification module circuit 21 and a common-gate amplification module circuit 22, the common-source amplification module circuit includes a first series inductor 211, a first transistor 212, a first feed resistor 213, a first feed capacitor 214, a first ground inductor 215, the common-gate amplification module circuit includes a second transistor 221, a second feed resistor 222, a second feed capacitor 223, a first output inductor 224, a second output inductor 225, and a first output capacitor 226, and the drain electrode of the first transistor 212 of the common-source amplification module circuit 21 is connected to the source electrode of the second transistor 221 of the common-gate amplification module circuit 22.
[0027] Preferably, the first series inductor 221 is connected to the input terminal of the low-noise amplifier 2 and the first feed resistor 213, the gate of the first transistor 212 is connected to the first feed resistor 213, the source of the first transistor 212 is connected to the first ground inductor 215, the drain of the first transistor 212 is connected to the source of the second transistor 221, the gate of the second transistor 221 is connected to the second feed resistor 222, the drain of the second transistor 221 is connected to the first output inductor 224 and the second output inductor 225, and the first output capacitor 226 is connected to the second output inductor 225 and the output terminal of the low-noise amplifier 2.
[0028] Preferably, the third inductor 161 of the receiving filter 1 and the first series inductor 221 of the low noise amplifier 1 are connected by wire-wound coupling.
[0029] The principle of the RF receiver front-end circuit: The RF receiver front-end circuit includes a receiver filter and a low-noise amplifier. The receiver filter is used to filter out interference signals in the communication environment. The first parallel resonator, the first series resonator, and the second series resonator in the receiver filter filter out interference signals in three different frequency bands. The first parallel inductor, the first series capacitor, and the second series capacitor are used to achieve impedance matching of the receiver filter. The low-noise amplifier amplifies the received signal and generates noise as little as possible. The noise usually comes from the first transistor and the second transistor of the low-noise amplifier. By using the first series inductor to perform impedance matching of the low-noise amplifier, the noise generated by the first transistor and the second transistor can be reduced as much as possible, achieving low-noise-figure signal amplification.
[0030] In traditional radio frequency (RF) receiver front-ends, the increasing number of interference frequency bands in communication places higher demands on the receiver filters of the RF receiver front-end circuit, and their size also increases accordingly, resulting in a larger RF front-end circuit size. Using advanced integrated circuit manufacturing technology and multi-layer substrate processes can reduce the size of the RF front-end circuit to a certain extent, but the corresponding circuit cost will increase significantly.
[0031] This invention introduces inductive coupling between the receiving filter and the low-noise amplifier. The coupling occurs before the third inductor of the receiving filter and the first series inductor of the low-noise amplifier. On the layout, these two inductors are wound together, as shown below. Figure 2 As shown, comparison Figure 3 Compared to the traditional layout of two inductors, the coupled inductor structure proposed in this invention reduces the layout size of two inductors to that of a single inductor, thereby reducing circuit size and cost. Furthermore, the coupling between the inductors introduces higher-order filter impedance matching, allowing for further reduction in the size of the receiving filter during design.
[0032] Example 1
[0033] A radio frequency receiving front end working at 3.3-4.2GHz is designed and manufactured by TSMC 65nm CMOS technology.
[0034] A radio frequency receiving front end circuit based on coupling structure comprises a receiving filter 1 and a low noise amplifier 2, the radio frequency receiving front end circuit is connected through input and output interfaces in the order of the receiving filter 1 and the low noise amplifier 2, the receiving filter 1 comprises a first parallel resonator 11, a first parallel inductor 12, a first series capacitor 13, a first series resonator 14, a second series capacitor 15 and a second series resonator 16, the first parallel resonator 11 is composed of a first inductor 111 and a first capacitor 112 in parallel, the first series resonator 14 is composed of a second inductor 141 and a second capacitor 142 in series, the second series resonator 16 is composed of a third inductor 161 and a third capacitor 162 in series, the first parallel resonator 11 is connected to the input end of the receiving filter 1 and the first parallel inductor 12, the first series resonator 14 is connected to the first series capacitor 13 and the second series capacitor 15, the second series resonator 16 is connected to the second series capacitor 15 and the output end of the receiving filter 1, the low noise amplifier 2 comprises a common source amplification module circuit 21 and a common gate amplification module circuit 22, the common source amplification module circuit comprises a first series inductor 211, a first transistor 212, a first feed resistor 213, a first feed capacitor 214 and a first ground inductor 215, the common gate amplification module circuit comprises a second transistor 221, a second feed resistor 222, a second feed capacitor 223, a first output inductor 224, a second output inductor 225 and a first output capacitor 226, the drain of the first transistor 212 of the common source amplification module circuit 21 is connected to the source of the second transistor 221 of the common gate amplification module circuit 22, the first series inductor 221 is connected to the input end of the low noise amplifier 2 and the first feed resistor 213, the gate of the first transistor 212 is connected to the first feed resistor 213, the source of the first transistor 212 is connected to the first ground inductor 215, the drain of the first transistor 212 is connected to the source of the second transistor 221, the gate of the second transistor 221 is connected to the second feed resistor 222, the drain of the second transistor 221 is connected to the first output inductor 224 and the second output inductor 225, the first output capacitor 226 is connected to the second output inductor 225 and the output end of the low noise amplifier 2, and the third inductor 161 of the receiving filter 1 and the first series inductor 221 of the low noise amplifier 1 are connected by winding coupling.
[0035] As Figure 4As shown, it is the voltage gain curve diagram of the utility model, demonstrated the utility model in 0.5-8GHz frequency range voltage gain amplification curve, wherein 3.3-4.2GHz's in-band voltage gain is greater than 19dB, has 60dB's inhibitory effect to Band1 and Band3 frequency band, has 40dB's inhibitory effect to Band41 frequency band, has 35dB's inhibitory effect to 5G WIFI frequency band.
[0036] In conclusion, the utility model discloses a kind of radio frequency receiving front-end circuit based on coupling structure, by introducing coupling structure between receiving filter and low noise amplifier, can effectively reduce circuit size, reduce circuit cost.
Claims
1. A radio frequency receiving front-end circuit based on a coupling structure, comprising a receiving filter (1) and a low-noise amplifier (2), wherein the output terminal of the receiving filter (1) is connected to the input terminal of the low-noise amplifier (2), characterized in that: The receiving filter (1) includes: a first parallel resonator (11), a first parallel inductor (12), a first series capacitor (13), a first series resonator (14), a second series capacitor (15), and a second series resonator (16); wherein, the first parallel resonator (11) is composed of a first inductor (111) and a first capacitor (112) connected in parallel, the first series resonator (14) is composed of a second inductor (141) and a second capacitor (142) connected in series, and the second series resonator (16) is composed of a third inductor (161) and a third capacitor (162) connected in series; The low-noise amplifier (2) includes a common-source amplifier module circuit (21) and a common-gate amplifier module circuit (22); wherein, the common-source amplifier module circuit (21) includes a first series inductor (211), a first transistor (212), a first feed resistor (213), a first feed capacitor (214), and a first ground inductor (215); the common-gate amplifier module circuit (22) includes a second transistor (221), a second feed resistor (222), a second feed capacitor (223), a first output inductor (224), a second output inductor (225), and a first output capacitor (226).
2. The radio frequency receiving front-end circuit based on a coupling structure according to claim 1, characterized in that: One end of the first parallel resonator (11) is connected to the input terminal of the receiving filter (1), and the other end is connected to one end of the first parallel inductor (12); the first series resonator (14) is connected in series between the first series capacitor (13) and the second series capacitor (15); one end of the second series resonator (16) is connected to the other end of the second series capacitor (15), and the other end constitutes the output terminal of the receiving filter (1).
3. The radio frequency receiving front-end circuit based on a coupling structure according to claim 1, characterized in that: The drain of the first transistor (212) of the common-source amplifier module circuit (21) is connected to the source of the second transistor (221) of the common-gate amplifier module circuit (22).
4. The radio frequency receiving front-end circuit based on a coupling structure according to claim 1, characterized in that: The first series inductor (211) is connected to the input terminal of the low noise amplifier (2) and the first feed resistor (213). The gate of the first transistor (212) is connected to the first feed resistor (213). The source of the first transistor (212) is connected to the first ground inductor (215). The gate of the second transistor (221) is connected to the second feed resistor (222). The drain of the second transistor (221) is connected to the first output inductor (224) and the second output inductor (225). The first output capacitor (226) is connected to the second output inductor (225) and the output terminal of the low noise amplifier (2).
5. The radio frequency receiving front-end circuit based on a coupling structure according to claim 1, characterized in that: The third inductor (161) of the receiving filter (1) and the first series inductor (211) of the low noise amplifier (2) are connected by wire-wound coupling.