CN213461682U - Touch type high-low gain television signal amplifier - Google Patents
Touch type high-low gain television signal amplifier Download PDFInfo
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- CN213461682U CN213461682U CN202022100009.3U CN202022100009U CN213461682U CN 213461682 U CN213461682 U CN 213461682U CN 202022100009 U CN202022100009 U CN 202022100009U CN 213461682 U CN213461682 U CN 213461682U
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Abstract
The utility model discloses a touch type high-low gain television signal amplifier, which comprises a touch controller, wherein the touch controller is connected with an electronic switch, the input end of the electronic switch is connected with an external power supply, the external power supply is also connected with the positive electrode of the voltage end of a first amplifier, the negative electrode of the voltage end of the first amplifier is grounded, the signal input end of the first amplifier is connected with an initial television signal through a first filter, and the signal output end of the first amplifier is connected with a first capacitor; the output end of the electronic switch comprises a left switch and a right switch; switch on through controlling switch control diode and realize the switching of high low gain, the utility model discloses technical scheme has realized the signal gain height adjustment of television signal amplifier, reduces the noise variation.
Description
Technical Field
The utility model relates to a TV signal amplifier technical field, in particular to touch type high-low gain TV signal amplifier.
Background
The current television antenna amplifier has fixed gain or realizes adjustable gain through attenuation. The amplification times of the fixed gain amplifier for amplifying signals are fixed, and when a television antenna is close to a transmitting tower or has strong interference nearby, the amplifier or a set top box is easy to saturate. In an amplifier that performs gain adjustment by attenuation, the noise factor increases and the signal-to-noise ratio deteriorates.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high low gain television signal amplifier of touch type, aim at realizing the signal gain height adjustment of television signal amplifier, reduce the noise variation.
In order to achieve the above object, the present invention provides a touch type high-low gain television signal amplifier, which comprises a touch controller, wherein the touch controller is connected with an electronic switch, an input end of the electronic switch is connected with an external power supply, the external power supply is further connected with a voltage end anode of a first amplifier, a voltage end cathode of the first amplifier is grounded, a signal input end of the first amplifier is connected with an initial television signal through a first filter, and a signal output end of the first amplifier is connected with a first capacitor; the output end of the electronic switch comprises a left switch and a right switch;
the left switch of the electronic switch is respectively connected with the input end of the first inductor, the positive electrode of the voltage end of the second amplifier and the input end of the second inductor; the output end of the first inductor is respectively connected with the input end of a first diode and one end of a second capacitor, the output end of the first diode is connected with the first capacitor, the other end of the second capacitor is connected with the signal input end of a second amplifier, the signal output end of the second amplifier is connected with the output end of the second inductor through a third capacitor, the output end of the second inductor outputs television signals through the second diode, a fourth capacitor and a second filter in sequence, and the negative electrode of the voltage end of the second amplifier is grounded;
the right switch of the electronic switch is respectively connected with the input ends of a third diode and a fourth diode through a third inductor, the output end of the third diode is grounded through a first resistor, and the output end of the fourth diode is grounded through a second resistor.
Preferably, the external power supply provides 5V dc.
Preferably, the capacitance of the first capacitor, the second capacitor, the third capacitor and the fourth capacitor is set to 1000PF, and is used for blocking direct current.
Preferably, the first inductor, the second inductor and the third inductor are set as 561nH isolation inductors.
Preferably, the first diode, the second diode, the third diode and the fourth diode are configured as PIN diodes.
Preferably, the first and second resistors are set to a bias resistance of 510 ohms.
Compared with the prior art, the beneficial effects of the utility model are that: the gain adjustment mode of the television signal amplifier in the prior art is improved, two amplifiers are adopted, one amplifier is in a low gain mode when working independently, the two amplifiers are in a high gain mode when working simultaneously, then the left switch and the right switch of the electronic switch are controlled through the touch controller, the switching of the high gain and the low gain of the television signal amplifier is realized through the conduction and the closing of the diode, the loss is reduced, and the signal-to-noise ratio is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a gain adjustment circuit of a television signal amplifier according to the present invention;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
Referring to fig. 1, the touch-type high-low gain television signal amplifier provided in this embodiment includes a touch controller, where the touch controller is connected to an electronic switch, an input end of the electronic switch is connected to an external power supply, the external power supply is further connected to a positive electrode of a voltage end of a first amplifier, a negative electrode of the voltage end of the first amplifier is grounded, a signal input end of the first amplifier is connected to an initial television signal through a first filter, and a signal output end of the first amplifier is connected to a first capacitor C1; the output end of the electronic switch comprises a left switch and a right switch;
the left switch of the electronic switch is respectively connected with the input end of a first inductor L1, the positive electrode of the voltage end of the second amplifier and the input end of a second inductor L2; the output end of the first inductor L1 is connected with the input end of a first diode D1 and one end of a second capacitor C2 respectively, the output end of the first diode D1 is connected with the first capacitor C1, the other end of the second capacitor C2 is connected with the signal input end of the second amplifier, the signal output end of the second amplifier is connected with the output end of the second inductor L2 through a third capacitor C3, the output end of the second inductor L2 outputs television signals through a second diode D2, a fourth capacitor C4 and a second filter in sequence, and the negative electrode of the voltage end of the second amplifier is grounded;
the right switch of the electronic switch is connected with the input ends of a third diode D3 and a fourth diode D4 through a third inductor L3, the output end of the third diode D3 is grounded through a first resistor R1, and the output end of the fourth diode D4 is grounded through a second resistor R2.
It should be noted that this embodiment improves the gain adjustment mode of the television signal amplifier in the prior art, and adopts two amplifiers, where one amplifier operates alone in the low gain mode and the two amplifiers operate simultaneously in the high gain mode, and then the touch controller controls the left switch and the right switch of the electronic switch, so as to switch the high gain and the low gain of the television signal amplifier through the on and off of the diode, reduce the loss, and improve the signal-to-noise ratio.
Specifically, the external power supply provides 5V dc power; the first filter and the second filter are used for filtering out-of-band signals and providing signal-to-noise ratio. The capacitance of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 is set to 1000PF and is used for blocking direct current. The first inductor L1, the second inductor L2, and the third inductor L3 are arranged as 561nH isolation inductors, which are used for passing direct current and blocking high frequency. The first diode D1, second diode D2, third diode D3 and fourth diode D4 are arranged as PIN diodes for providing a bias. The first resistor R1 and the second resistor R2 are set to a bias resistance of 510 ohms.
It should be noted that the touch controller operates in the touch inversion mode, and the high-low level function definition depends on the actual application, and is not limited to the function definition. For illustration, when the touch controller outputs a high level, the electronic switch turns on the left switch, and when the touch controller outputs a low level, the electronic switch turns on the right switch.
When the touch controller outputs a high level, the third diode D3 and the fourth diode D4 are turned off because there is no power source. The first diode D1 and the second diode D2 are powered to operate in a conducting state, the second amplifier also operates due to the power, the first amplifier is powered by an external power supply and normally operates, the two amplifiers operate simultaneously, and the whole circuit operates in a high gain mode.
When the touch controller outputs a low level, the third diode D3 and the fourth diode D4 are turned on because they are powered. The first diode D1, the second diode D2 and the second amplifier have no power supply, so the first diode D1 and the second diode D2 work in a cut-off state, the second amplifier does not work, the first amplifier is powered by an external power supply to work normally, and the whole circuit works in a low gain mode.
The above is only the preferred embodiment of the present invention, and not 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 the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (6)
1. A touch type high-low gain television signal amplifier is characterized by comprising a touch controller, wherein the touch controller is connected with an electronic switch, the input end of the electronic switch is connected with an external power supply, the external power supply is also connected with the positive electrode of the voltage end of a first amplifier, the negative electrode of the voltage end of the first amplifier is grounded, the signal input end of the first amplifier is connected with an initial television signal through a first filter, and the signal output end of the first amplifier is connected with a first capacitor; the output end of the electronic switch comprises a left switch and a right switch;
the left switch of the electronic switch is respectively connected with the input end of the first inductor, the positive electrode of the voltage end of the second amplifier and the input end of the second inductor; the output end of the first inductor is respectively connected with the input end of a first diode and one end of a second capacitor, the output end of the first diode is connected with the first capacitor, the other end of the second capacitor is connected with the signal input end of a second amplifier, the signal output end of the second amplifier is connected with the output end of the second inductor through a third capacitor, the output end of the second inductor outputs television signals through the second diode, a fourth capacitor and a second filter in sequence, and the negative electrode of the voltage end of the second amplifier is grounded;
the right switch of the electronic switch is respectively connected with the input ends of a third diode and a fourth diode through a third inductor, the output end of the third diode is grounded through a first resistor, and the output end of the fourth diode is grounded through a second resistor.
2. The touch high and low gain television signal amplifier of claim 1, wherein said external power supply provides 5 volts direct current.
3. The touch high-low gain television signal amplifier of claim 1, wherein the capacitance of the first capacitor, the second capacitor, the third capacitor and the fourth capacitor is set to 1000PF and is used for blocking direct current.
4. The touch high low gain television signal amplifier of claim 1, wherein the first inductor, the second inductor and the third inductor are set as 561nH isolation inductors.
5. The touch high and low gain television signal amplifier of claim 1, wherein the first diode, the second diode, the third diode and the fourth diode are configured as PIN diodes.
6. The touch high and low gain television signal amplifier of claim 1, wherein said first and second resistors are set to a bias resistance of 510 ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022100009.3U CN213461682U (en) | 2020-09-22 | 2020-09-22 | Touch type high-low gain television signal amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022100009.3U CN213461682U (en) | 2020-09-22 | 2020-09-22 | Touch type high-low gain television signal amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213461682U true CN213461682U (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022100009.3U Active CN213461682U (en) | 2020-09-22 | 2020-09-22 | Touch type high-low gain television signal amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213461682U (en) |
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2020
- 2020-09-22 CN CN202022100009.3U patent/CN213461682U/en active Active
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