Summary of the invention
Technical problem to be solved by this invention provides a kind of vehicle active antenna amplifier with automatic gain function.
The technical scheme that the present invention adopted is:
Automatic gain vehicle active antenna amplifier comprises that power circuit 15, frequency modulation input frequency selection circuit 16, frequency modulation agc circuit 17, frequency modulation output frequency selection circuit 18, amplitude modulation input frequency selection circuit 19, amplitude modulation agc circuit 20, amplitude modulation output frequency selection circuit 21, anti-treble attenuation circuit 22, frequency modulation AGC threshold value adjustment circuit 23, amplitude modulation AGC threshold value adjustment circuit 24, frequency modulation AGC response time adjust that circuit 25, amplitude modulation AGC response time are adjusted circuit 26, biasing circuit 27, reference voltage power filter 28, chip U1 are imported in amplitude modulation;
Antenna output connects chip U1 through frequency modulation input frequency selection circuit 16, and the frequency modulation output of chip U1 connects receiver through frequency modulation output frequency selection circuit 18,
Frequency modulation AGC threshold value adjustment circuit 23 is connected chip U1 respectively with the output that the frequency modulation AGC response time is adjusted circuit 25,
The frequency modulation AGC control output of chip U1 connects frequency modulation agc circuit 17;
Antenna output connects chip U1 through amplitude modulation input frequency selection circuit 19, also connects chip U1 through amplitude modulation input biasing circuit 27 simultaneously, and the amplitude modulation output of chip U1 connects receiver through amplitude modulation output frequency selection circuit 21,
Amplitude modulation AGC threshold value adjustment circuit 24 is connected chip U1 respectively with the output that the amplitude modulation AGC response time is adjusted circuit 26,
The amplitude modulation AGC control output of chip U1 connects amplitude modulation agc circuit 20.
Chip U1 adopts the ATR425X integrated circuit.
Mechanical structure comprises circuit board 14, support 5, loam cake 6, lower cover 13, signal terminal 8, signal input line 7 and base of a fruit line 3, signal output plug 2, power input socket 1,
Single face is pasted with said amplifier chip U1 and electronic component on the circuit board 14; And the coaxial cable in the base of a fruit line 39 penetrates and is crimped on the support 5 from the cable-through hole 4 of support 5; Signal input line 7 with and base of a fruit line 3 in coaxial cable 9, the corresponding aperture position that power line 10 is welded to circuit board 14 respectively; Circuit board is through being weldingly fixed on the support 5 with earth terminal 11,12
Loam cake 6 and lower cover 13 protect circuit board 14 and the part support 5 that is connected with circuit board 14 through the buckle mode.
Good effect of the present invention is: 1, utilize automatic gain control agc circuit to eliminate the antenna amplifier antennafire output amplitude and require voltage error between the output amplitude; Improved the amplifier dynamic range; Make stable output signal; Thereby radio reception is clear, also can distortion under the fast-changing extreme environment of signal strength signal intensity even be in.2, adopt the double-sided PCB single face to mount design, simplified production technology, be convenient to assembling.3, adopt chip that signal is handled, simplified amplifier circuit.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
1, circuit block diagram of the present invention is as shown in Figure 3,
Automatic gain vehicle active antenna amplifier comprises that power circuit 15, frequency modulation input frequency selection circuit 16, frequency modulation agc circuit 17, frequency modulation output frequency selection circuit 18, amplitude modulation input frequency selection circuit 19, amplitude modulation agc circuit 20, amplitude modulation output frequency selection circuit 21, anti-treble attenuation circuit 22, frequency modulation AGC threshold value adjustment circuit 23, amplitude modulation AGC threshold value adjustment circuit 24, frequency modulation AGC response time adjust that circuit 25, amplitude modulation AGC response time are adjusted circuit 26, biasing circuit 27, reference voltage power filter 28, chip U1 are imported in amplitude modulation;
Antenna output connects chip U1 through frequency modulation input frequency selection circuit 16, and the frequency modulation output of chip U1 connects receiver through frequency modulation output frequency selection circuit 18,
Frequency modulation AGC threshold value adjustment circuit 23 is connected chip U1 respectively with the output that the frequency modulation AGC response time is adjusted circuit 25,
The frequency modulation AGC control output of chip U1 connects frequency modulation agc circuit 17;
Antenna output connects chip U1 through amplitude modulation input frequency selection circuit 19, also connects chip U1 through amplitude modulation input biasing circuit 27 simultaneously, and the amplitude modulation output of chip U1 connects receiver through amplitude modulation output frequency selection circuit 21,
Amplitude modulation AGC threshold value adjustment circuit 24 is connected chip U1 respectively with the output that the amplitude modulation AGC response time is adjusted circuit 26,
The amplitude modulation AGC control output of chip U1 connects amplitude modulation agc circuit 20.
Chip U1 adopts the ATR425X integrated circuit.
Mechanical structure comprises circuit board 14, support 5, loam cake 6, lower cover 13, signal terminal 8, signal input line 7 and base of a fruit line 3, signal output plug 2, power input socket 1,
Single face is pasted with said amplifier chip U1 and electronic component on the circuit board 14; And the coaxial cable in the base of a fruit line 39 penetrates and is crimped on the support 5 from the cable-through hole 4 of support 5; Signal input line 7 with and base of a fruit line 3 in coaxial cable 9, the corresponding aperture position that power line 10 is welded to circuit board 14 respectively; Circuit board is through being weldingly fixed on the support 5 with earth terminal 11,12
Loam cake 6 and lower cover 13 protect circuit board 14 and the part support 5 that is connected with circuit board 14 through the buckle mode.
Aerial signal carries out frequency-selecting through frequency modulation input frequency selection circuit 16, and the signal after the frequency-selecting gets among the chip U1 and carries out processing and amplifying, and the signal after the amplification is transferred to receiver through frequency modulation output frequency selection circuit 18.When FM signal needs automatic gain control, adjust circuit 25 through frequency modulation AGC threshold value adjustment circuit 23 with the frequency modulation AGC response time, confirm threshold value and the response time of frequency modulation AGC, signal is realized AGC through frequency modulation agc circuit 17; Aerial signal carries out frequency-selecting through amplitude modulation input frequency selection circuit 19, and the signal after the frequency-selecting feeds back through amplitude modulation input biasing circuit 27, gets into simultaneously among the chip U1 and carries out processing and amplifying, and the signal after the amplification is transferred to receiver through amplitude modulation output frequency selection circuit 21.When amplitude-modulated signal needs automatic gain control, adjust circuit 26 through amplitude modulation AGC threshold value adjustment circuit 24 with the amplitude modulation AGC response time, confirm threshold value and the response time of amplitude modulation AGC, signal is realized AGC through amplitude modulation agc circuit 20.
2, circuit theory diagrams of the present invention are as shown in Figure 4.The with dashed lines square frame has marked each logical block corresponding electrical circuits element composition among Fig. 3 among the figure.
Power circuit 15 is made up of diode D1, resistance R 16, inductance L 8, capacitor C 20, C23 and voltage-stabiliser tube D2;
Frequency modulation input frequency selection circuit 16 is made up of capacitor C 2, inductance L 1, L3, L4;
Frequency modulation agc circuit 17 is made up of PIN pipe P1, resistance R 1, R2, R4, capacitor C 3 and triode Q1;
Frequency modulation output frequency selection circuit 18 is made up of capacitor C 21;
Amplitude modulation input frequency selection circuit 19 is made up of capacitor C 1, inductance L 1, L2;
Amplitude modulation agc circuit 20 is made up of diode PIN pipe P2, resistance R 11, R12, R13, capacitor C 18 and triode Q2;
Amplitude modulation output frequency selection circuit 21 is made up of inductance L 6, resistance R 14 and capacitor C 19;
Anti-treble attenuation circuit 22 is made up of resistance R 7, R15 and capacitor C 11, C22;
Frequency modulation AGC threshold value adjustment circuit 23 is made up of with capacitor C 16, C17 resistance R 10;
Amplitude modulation AGC threshold value adjustment circuit 24 is made up of resistance R 5, R9 and capacitor C 6;
The frequency modulation AGC response time is adjusted circuit 25 and is made up of capacitor C 15;
The amplitude modulation AGC response time is adjusted circuit 26 and is made up of capacitor C 7, C12;
Amplitude modulation input biasing circuit 27 is made up of resistance R 6, capacitor C 9;
Reference voltage power filter 28 is made up of capacitor C 13, C14.
Chip U1 adopts ATR425X.The processing and amplifying that is used for signal realizes the automatic gain control logic computing of signal.
Concrete circuit structure is following:
Power circuit 15 parts link to each other with resistance R 16 through diode D1, and the other end of resistance R 16 links to each other with inductance L 8, and the other end of inductance L 8 connects voltage stabilizing didoe D2, drop-down capacitor C 20, C23,2 pin of inductance L 7 and 17 pin of chip, output Vp power supply signal.
Inductance L 1 one termination car antenna signal terminals in the frequency modulation input frequency selection circuit 16, the other end of inductance L 1 connect capacitor C 2, inductance L 3, L4 composition frequency modulation input frequency selection circuit, inductance L 4 other end ground connection; Connect PIN pipe P1 and capacitor C 4 in the frequency modulation agc circuit 17 through inductance L 3, the other end of PIN pipe P1 links to each other with drop-down ground capacity C3, pull down resistor R4 and triode Q1 collector electrode, and the emitter of triode Q1 sockets Vp resistance R 2 on connecting; Base stage connects 5 pin of pull-up resistor R1 and chip U1, and the other end of capacitor C 4 connects 2 pin, capacitor C 22 and the inductance L 5 of chip U1, and the other end of capacitor C 22 links to each other with 1 pin of resistance R 15; Inductance L 5 other ends connect 3 pin and the capacitor C 10 of chip U1; Capacitor C 10 other ends link to each other with pull down resistor R3, and 1 pin of chip U1 connects resistance R 7 and pull down resistor R8, and the other end of R7 connects drop-down capacitor C 11; The 4 pin ground connection of chip U1; 7 pin of chip U1 are connected with drop-down capacitor C 9 with resistance R 6, and the other end of resistance R 6 links to each other with 1 pin of capacitor C 8 and 8 pin of chip U1, and 9 pin of chip U1 connect drop-down capacitor C 7; 10 pin of chip U1 link to each other with capacitor C 6, and the electric capacity other end connects 1 pin and the pull down resistor R5 of resistance R 9.
Inductance L 1 one termination car antenna signal terminals in the amplitude modulation input frequency selection circuit 19, the other end of inductance L 1 connect inductance L 2, capacitor C 1, C5 composition amplitude modulation input frequency selection circuit, and the other end of capacitor C 1 connects 2 pin of capacitor C 8; Through the PIN pipe P2 in capacitor C 5 connections and the amplitude modulation agc circuit 20; The other end of PIN pipe P2 connects the collector electrode of pull down resistor R11, drop-down capacitor C 18 and triode Q2, and the emitter of triode Q2 connects pull-up resistor R12, and the base stage of triode Q2 connects 11 pin of pull-up resistor R13 and chip U1; 12 pin of chip U1 connect drop-down C12; 13, the 20 pin ground connection of chip U1,15 pin of chip U1 connect drop-down capacitor C 13, C14, and 16 pin of chip U1 connect drop-down capacitor C 15; 18 pin of chip U1 connect capacitor C 17 and drop-down capacitor C 16; The other end of capacitor C 17 links to each other with resistance R 10, and resistance R 10 other ends connect 19 pin of chip U1,2 pin of resistance R 15,1 pin and the capacitor C 21 of inductance L 7, and the other end of capacitor C 21 connects the output of parallel coaxial-cable signal; 2 pin of resistance R 9 connect 14 pin, the inductance L 6 of chip U1; An other end of inductance L 6 links to each other with resistance R 14, and the other end of resistance R 14 connects capacitor C 19, and the other end of capacitor C 19 connects signal output part.
3, circuit each several part operation principle is following:
Aerial signal obtains FM signal through inductance L 1, L3, L4, capacitor C 2 frequency-selectings; Be input to 2 pin (frequency modulation input) of chip through coupling capacitance C4; Amplify through chip internal, signal amplifies the back and after capacitor C 21 frequency-selectings, exports FM signal from the 19 pin frequency modulation output of chip.When FM signal needs automatic gain control; 5 pin frequency modulation AGC turn-on transistor Q1 of chip; Drive PIN pipe P1 conducting, realize frequency modulation gain adjustment, through the threshold value of resistance R 10 with capacitor C 16, C17 adjustment frequency modulation AGC; Capacitor C 15 is confirmed the response time of frequency modulation automatic gain control, finally realizes frequency modulation AGC.
Aerial signal obtains amplitude-modulated signal through inductance L 1, L2, capacitor C 1 frequency-selecting; Be input to the 8 pin amplitude modulation input of chip through coupling capacitance C8; Amplify through chip internal, signal amplifies the back and after inductance L 4, resistance R 14 and capacitor C 19 frequency-selectings, exports amplitude-modulated signal from the 14 pin amplitude modulation output of chip.When amplitude-modulated signal needs automatic gain control; 11 pin amplitude modulation AGC turn-on transistor Q2 of chip; Drive PIN pipe P2 conducting, realize amplitude modulation gain adjustment, through the threshold value of resistance R 5, R9 and capacitor C 6 adjustment amplitude modulation automatic gain controls; Capacitor C 17, C12 confirm the response time of amplitude modulation automatic gain control, finally realize amplitude modulation AGC.
The external power supply signal through resistance R 16, inductance L 8, filter capacitor C20, C23 and voltage stabilizing didoe D2 voltage stabilizing, provides the working power of chip and frequency modulation/amplitude modulation AGC control circuit through the unidirectional conducting of diode D1.
4, mechanical structure of the present invention such as Fig. 1, shown in Figure 2, product mainly are made up of circuit board 14, support 5, loam cake 6, lower cover 13, signal terminal 8, signal input line 7 and base of a fruit line 3, signal output plug 2, power input socket 1 etc.
Single face is pasted with antenna amplifier antennafire chip U1 and electronic component on the circuit board 14; And the coaxial cable in the base of a fruit line 39 penetrates and is crimped on the support 5 from the cable-through hole 4 of support 5; Signal input line 7 with and base of a fruit line 3 in coaxial cable 9, the corresponding aperture position that power line 10 is welded to circuit board 14 respectively, circuit board is through being weldingly fixed on the support 5 with earth terminal 11,12.
Loam cake 6 and lower cover 13 protect circuit board 14 and the part support 5 that is connected with circuit board 14 through the buckle mode.