CN210093181U - Signal amplification circuit applied to microwave mobile sensor - Google Patents
Signal amplification circuit applied to microwave mobile sensor Download PDFInfo
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- CN210093181U CN210093181U CN201921249455.1U CN201921249455U CN210093181U CN 210093181 U CN210093181 U CN 210093181U CN 201921249455 U CN201921249455 U CN 201921249455U CN 210093181 U CN210093181 U CN 210093181U
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Abstract
The utility model discloses a be applied to microwave mobile sensor's signal amplification circuit, this signal amplification circuit includes an operational amplifier circuit, and this operational amplifier circuit includes: a signal is input from a left end IF _ IN port, the signal passes through a first-stage RC filter circuit formed by a resistor R1 and a capacitor C1, a multiple negative feedback second-order low-pass filter circuit formed by an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a capacitor C3 and a capacitor C4, a bias voltage circuit for providing bias voltage for an anode port of the operational amplifier U1 by a resistor R5 and a resistor R6, the output end of the operational amplifier U1 is connected with a resistor R4, the other end of the resistor R4 is a low-pass filter output end and is connected with a capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the capacitor C4 and the other end of the resistor R3 are connected with each other and are connected to a circuit node between the output end of the operational amplifier U1 and.
Description
Technical Field
The utility model relates to a sensor circuit technical field, specific saying so relates to a be applied to microwave mobile sensor's signal amplification circuit. The utility model discloses a Doppler signal enlargies and the filtering of the microwave moving object sensor who is used for illumination, security protection, little household electrical appliances and other intelligent house. In particular to a microwave moving object detection sensor used for 3.0GHz and 5.8GHz ISM frequency bands.
Background
The existing sensors, Doppler signal amplification and filters for detecting moving objects of 3.0GHz and 5.8GHz discrete devices all adopt active filters with gain double-operational-amplifier structures, positive-end input signals and output signals of the filters are fed back to a negative end through a high-low-pass filter, low-frequency signals and high-frequency signals are close to full feedback, useful intermediate-frequency signals are relatively small in feedback, and therefore the gain is relatively large.
Because the Doppler signal is small, a two-stage amplifier is needed to achieve the required voltage amplification factor of thousands of times, and the circuit cost is increased.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model needs to solve
The technical problem to be solved is to provide a signal amplification circuit applied to a microwave mobile sensor, the single operational amplifier can reduce the cost of the sensor circuit, simultaneously can also reduce the number of operational amplifiers, correspondingly reduces the number of peripheral components, and has better high-frequency cut-off characteristic.
In order to solve the technical problem, the utility model discloses a following scheme realizes: a signal amplifying circuit applied to a microwave mobile sensor comprises an operational amplifier circuit;
the operational amplifier circuit includes:
a signal is input from a left end IF _ IN port, and passes through a first-stage RC filter circuit formed by a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 IN series, and the other end of the capacitor C1 is grounded;
a multiple negative feedback second-order low-pass filter circuit composed of an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a capacitor C3 and a capacitor C4, wherein the resistor R1, the capacitor C2, the resistor R2 and the capacitor C4 are sequentially connected to form a series circuit, the capacitor C3 and the resistor R3 are respectively and electrically connected to a circuit node between the capacitor C2 and the resistor R2, the other end of the capacitor C3 is grounded, and a circuit node between the resistor R2 and the capacitor C4 is connected to an input port of the operational amplifier U1;
a bias voltage circuit which provides a bias voltage for the input port of the operational amplifier U1 by a resistor R5 and a resistor R6, wherein the resistor R5 is connected in series with the resistor R6, the other end of the resistor R5 is grounded, a circuit node between the resistor R5 and the resistor R6 is electrically connected with a capacitor C6 and the input port of the operational amplifier U1, the other end of the resistor R6 is connected to a VCC power supply, and the other end of the capacitor C6 is grounded;
the output end of the operational amplifier U1 is connected with a resistor R4, the other end of the resistor R4 is a low-pass filtering output end and is connected with a capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the capacitor C4 and the other end of the resistor R3 are mutually connected and connected to a circuit node between the output end of the operational amplifier U1 and the resistor R4.
Further, the operational amplifier U1 operates with a single power supply.
Further, the first-stage RC filter is used for filtering carrier signals of microwaves.
Furthermore, the multiple negative feedback second-order low-pass filter circuit is a main active filter.
Compared with the prior art, the beneficial effects of the utility model are that: in order to reduce cost, the utility model discloses a be applied to microwave mobile sensor's single fortune amplifier can only adopt single fortune to put can, main part active filter adopts multiple negative feedback second order low pass filter, and the amplitude-frequency curve descends more precipitously, because signal processing adopts digital technique, and the magnification reduces also can handle. The utility model discloses it is exactly a signal amplification circuit who is applied to microwave mobile sensor to design, can reduce the quantity that fortune was put, and outlying components and parts quantity also very reduces simultaneously to have better high frequency cut-off characteristic.
Drawings
Fig. 1 is a circuit diagram of the single operational amplifier of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention. It is obvious that the described embodiments of the invention are only some of the embodiments of the invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1: the utility model discloses a concrete structure as follows:
referring to fig. 1, the signal amplifying circuit applied to a microwave mobile sensor of the present invention includes an operational amplifier circuit;
the operational amplifier circuit includes:
a signal is input from a left end IF _ IN port, and passes through a first-stage RC filter circuit formed by a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 IN series, and the other end of the capacitor C1 is grounded;
a multiple negative feedback second-order low-pass filter circuit composed of an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a capacitor C3 and a capacitor C4, wherein the resistor R1, the capacitor C2, the resistor R2 and the capacitor C4 are sequentially connected to form a series circuit, the capacitor C3 and the resistor R3 are respectively and electrically connected to a circuit node between the capacitor C2 and the resistor R2, the other end of the capacitor C3 is grounded, and a circuit node between the resistor R2 and the capacitor C4 is connected to an input port of the operational amplifier U1;
a bias voltage circuit which provides a bias voltage for the input port of the operational amplifier U1 by a resistor R5 and a resistor R6, wherein the resistor R5 is connected in series with the resistor R6, the other end of the resistor R5 is grounded, a circuit node between the resistor R5 and the resistor R6 is electrically connected with a capacitor C6 and the input port of the operational amplifier U1, the other end of the resistor R6 is connected to a VCC power supply, and the other end of the capacitor C6 is grounded;
the output end of the operational amplifier U1 is connected with a resistor R4, the other end of the resistor R4 is a low-pass filtering output end and is connected with a capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the capacitor C4 and the other end of the resistor R3 are mutually connected and connected to a circuit node between the output end of the operational amplifier U1 and the resistor R4.
In a preferred technical solution of this embodiment, the operational amplifier U1 operates with a single power supply.
In a preferred technical solution of this embodiment, the first-stage RC filter is configured to filter a carrier signal of a microwave.
In a preferred technical solution of this embodiment, the multiple negative feedback second-order low-pass filter circuit is a main active filter.
Example 2:
the utility model discloses a signal amplification circuit theory of operation as follows:
as shown IN fig. 1, a signal is input from the left IF _ IN port, and passes through a first-stage RC filter formed by a resistor R1 and a capacitor C1, where the first-stage RC filter mainly filters a carrier signal of microwave.
The operational amplifier U1, the resistor R1, the resistor R2, the resistor R3, the capacitor C3 and the capacitor C4 form a multiple negative feedback second-order low-pass filter circuit which is used for suppressing high-frequency interference and noise. The operational amplifier U1 works by adopting a single power supply, so that a resistor R5 and a resistor R6 provide a proper bias voltage for a positive input port of the operational amplifier U1, a capacitor C6 decouples a bias voltage power supply, in order to enable the operational amplifier U1 to work in a proper bias state, the negative input end should be fed back fully to direct current, the characteristic of a voltage follower is presented, and a capacitor C2 plays a direct current blocking role, so that the direct current component of an input signal is isolated, and the proper static working point of a circuit is ensured. The amplified output signal is output through low-pass filtering of a resistor R4 and a capacitor C5, the resistor R4 and the capacitor C5 can be omitted, the output signal is subjected to ADC sampling processing of a single chip microcomputer to obtain movement information of an object, sampling clock pulses can appear in the output signal of the omitted C5, and the effect is not influenced.
Example 3:
the utility model discloses a filter characteristic can obtain through adjusting resistance R1, resistance R2, resistance R3 and electric capacity C2, electric capacity C3, electric capacity C4, and the magnification is through adjusting resistance R3 or resistance R1 realization. The power supply voltage can be 3.3-15V, and if the subsequent ADC power supply voltage is 3.3-5V, the voltage of the operational amplifier U1 is not more than the working voltage of the single chip microcomputer.
The specific values of the elements are as follows:
the resistance R5 ═ R6 ═ 100k Ω, the capacitance C6 ═ 10uF, the resistance R1 ═ 1.2k Ω, the resistance R2 ═ 1.2k Ω, the resistance R3 ═ 240k Ω, the resistance R5 ═ 10k Ω, the capacitance C1 ═ 10nF, the capacitance C2 ═ 10uF, the capacitance C3 ═ 10uF, the capacitance C4 ═ 15nF, and the capacitance C5 ═ 10 nF. The maximum amplification factor at 17Hz was 224 and 46 for 50Hz at power frequency.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (4)
1. A signal amplification circuit applied to a microwave mobile sensor is characterized in that: the signal amplifying circuit comprises an operational amplifier circuit;
the operational amplifier circuit includes:
a signal is input from a left end IF _ IN port and passes through a first-stage RC filter circuit consisting of a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 IN series, and the other end of the capacitor C1 is grounded;
a multiple negative feedback second-order low-pass filter circuit composed of an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a capacitor C3 and a capacitor C4, wherein the resistor R1, the capacitor C2, the resistor R2 and the capacitor C4 are sequentially connected to form a series circuit, the capacitor C3 and the resistor R3 are respectively and electrically connected to a circuit node between the capacitor C2 and the resistor R2, the other end of the capacitor C3 is grounded, and a circuit node between the resistor R2 and the capacitor C4 is connected to an input port of the operational amplifier U1;
a bias voltage circuit which provides a bias voltage for the input port of the operational amplifier U1 by a resistor R5 and a resistor R6, wherein the resistor R5 is connected in series with the resistor R6, the other end of the resistor R5 is grounded, a circuit node between the resistor R5 and the resistor R6 is electrically connected with a capacitor C6 and the input port of the operational amplifier U1, the other end of the resistor R6 is connected to a VCC power supply, and the other end of the capacitor C6 is grounded;
the output end of the operational amplifier U1 is connected with a resistor R4, the other end of the resistor R4 is a low-pass filtering output end and is connected with a capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the capacitor C4 and the other end of the resistor R3 are mutually connected and connected to a circuit node between the output end of the operational amplifier U1 and the resistor R4.
2. The signal amplification circuit applied to the microwave motion sensor as claimed in claim 1, wherein: the op-amp U1 operates using a single power supply.
3. The signal amplification circuit applied to the microwave motion sensor as claimed in claim 1, wherein: the first-stage RC filter is used for filtering carrier signals of microwaves.
4. The signal amplification circuit applied to the microwave motion sensor as claimed in claim 1, wherein: the multiple negative feedback second-order low-pass filter circuit is a main active filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921249455.1U CN210093181U (en) | 2019-08-01 | 2019-08-01 | Signal amplification circuit applied to microwave mobile sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921249455.1U CN210093181U (en) | 2019-08-01 | 2019-08-01 | Signal amplification circuit applied to microwave mobile sensor |
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| CN210093181U true CN210093181U (en) | 2020-02-18 |
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| CN201921249455.1U Active CN210093181U (en) | 2019-08-01 | 2019-08-01 | Signal amplification circuit applied to microwave mobile sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381760A (en) * | 2021-06-22 | 2021-09-10 | 深圳市几度创想科技有限公司 | High-speed transmission high-precision analog-to-digital conversion circuit |
-
2019
- 2019-08-01 CN CN201921249455.1U patent/CN210093181U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381760A (en) * | 2021-06-22 | 2021-09-10 | 深圳市几度创想科技有限公司 | High-speed transmission high-precision analog-to-digital conversion circuit |
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