CN201322804Y - CCD analog signal processing circuit of space multispectral remote sensor - Google Patents

Abstract

The signal input end of the space multispectral remote sensor CCD analog signal processing circuit passes through a resistor R in sequence₁Resistance R₂Resistance R₃A resistor R connected to the positive input terminal of the operational amplifier₁And a resistance R₂Is connected through a resistor R₄Connected to a reference potential, resistor R₂And a resistance R₃Is connected to the node via a capacitor C₁Connected with the output end of the operational amplifier, and the positive input end of the operational amplifier is connected with the output end of the operational amplifier through a capacitor C₂Connected to a reference potential, the negative input of the operational amplifier is connected via a resistor R₆The negative input end of the operational amplifier is connected with a reference potential and is also connected with the reference potential through a resistor R₅Connected with the output end of the operational amplifier, the output end of the operational amplifier passes through a resistor R₇Is connected with the signal output end which is also connected with the signal output end through a resistor R₈Connected to a reference potential. The utility model discloses simple structure can accomplish the regulation to gain and bandwidth, and noise information in the filtering useful signal provides the input of high quality for the back level.

Description

Space multi-spectral remote sensor CCD analog signal processing circuit

Technical field

The utility model relates to a kind of analogue signal circuit, particularly a kind of circuit that the simulating signal of Space Remote Sensors CCD is handled of being used for.

Background technology

At present, the typical circuit schematic diagram that space multi-spectral remote sensor CCD analog signal processing is adopted as shown in Figure 1, signal input part 101 passes through resistance R ₁Link to each other with the positive input 131 of operational amplifier 121, the negative input 132 of operational amplifier 121 passes through resistance R ₃Link to each other with the reference ground wire, the negative input 132 of operational amplifier 121 also passes through resistance R ₂Link to each other with the output terminal 102 of operational amplifier 121, the output terminal 102 of operational amplifier 121 is also as the output terminal of whole analog signal processing circuit.

If the input signal of signal input part 101 is U1, the output signal of signal output part 102 is U2, resistance R ₁Resistance be R1, resistance R ₂Resistance be R2, following relationship is then arranged:

U2＝U1(1+R2/R1)

By following formula as can be known, this signal processing circuit adopts the amplification output mode of standard, and this signal circuit only has the gain-adjusted pattern, and circuit bandwidth is subject to the intrinsic bandwidth of operational amplifier 121 itself, can't adjust flexibly.

The utility model content

Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of to signal gain and all adjustable space multi-spectral remote sensor CCD analog signal processing circuit of bandwidth.

Technical solution of the present utility model is: space multi-spectral remote sensor CCD analog signal processing circuit comprises operational amplifier, resistance R ₁, resistance R ₂, resistance R ₃, resistance R ₄, resistance R ₅, resistance R ₆, resistance R ₇, resistance R ₈, capacitor C ₁And capacitor C ₂, signal input part is successively through resistance R ₁, resistance R ₂, resistance R ₃Link to each other resistance R with the positive input of operational amplifier ₁And resistance R ₂Tie point pass through resistance R ₄Link to each other resistance R with reference potential ₂And resistance R ₃Tie point pass through capacitor C ₁Link to each other with the output terminal of operational amplifier, the positive input of operational amplifier also passes through capacitor C ₂Link to each other with reference potential, the negative input of operational amplifier passes through resistance R ₆Link to each other with reference potential, the negative input of operational amplifier also passes through resistance R ₅Link to each other with the output terminal of operational amplifier, the output terminal of operational amplifier passes through resistance R ₇Link to each other with signal output part, signal output part also passes through resistance R ₈Link to each other with reference potential.

Described resistance R ₂Resistance and described resistance R ₃Resistance equate.Described resistance R ₅Resistance and described resistance R ₆Resistance equate.Described resistance R ₇Resistance and described resistance R ₈Resistance equate.Described capacitor C ₂The appearance value be described capacitor C ₁2 times of appearance value.

The utility model advantage compared with prior art is: the utility model analog signal processing circuit adopts operational amplifier, resistor, capacitor to carry out circuit design, utilize the input pickup resistance device to the input signal preconditioning that gains earlier, constitute the bandwidth tunable low pass filter by operational amplifier and capacitor then signal is carried out denoising, at last again by resistor to the output signal preconditioning that gains, simple in structure, can finish adjusting to gain and bandwidth, noise information in the filtering useful signal is for the back level provides superior in quality input.

Description of drawings

Fig. 1 is an existing space multispectral remote sensor CCD analog signal processing circuit;

Fig. 2 is the utility model space multi-spectral remote sensor CCD analog signal processing circuit.

Embodiment

Circuit theory diagrams of the present utility model comprise operational amplifier 231, resistance R as shown in Figure 2 ₁211, resistance R ₂212, resistance R ₃213, resistance R ₄214, resistance R ₅215, resistance R ₆216, resistance R ₇217, resistance R ₈218, capacitor C ₁221 and capacitor C ₂222, input end 201 passes through resistance R ₁211, resistance R ₂212, resistance R ₃213 link to each other resistance R with the positive input 243 of operational amplifier 231 ₁211, resistance R ₂212 tie point 241 passes through resistance R ₄214 link to each other resistance R with the reference ground wire ₂212, resistance R ₃213 tie point 242 passes through capacitor C ₁221 link to each other with operational amplifier output terminal 245, and the positive input 243 of operational amplifier 231 passes through capacitor C ₂222 link to each other with the reference ground wire, and the negative input 244 of operational amplifier 231 passes through resistance R ₆216 link to each other with the reference ground wire, and the negative input 244 of operational amplifier 231 passes through resistance R ₅215 link to each other with the output terminal 245 of operational amplifier 231, and the output terminal 245 of operational amplifier 231 passes through resistance R ₇217 link to each other with signal output part 202, and signal output part 202 passes through resistance R ₈218 link to each other resistance R with the reference ground wire ₁211 resistance and resistance R ₄214 is signal gain scalable item, resistance R ₂212 resistance and resistance R ₃213 resistance equates, resistance R ₅215 resistance and resistance R ₆216 resistance equates, resistance R ₇217 resistance and resistance R ₈218 resistance equates, capacitor C ₂222 appearance value is a capacitor C ₁2 times of 221 appearance value.

If resistance R ₁211 resistance is R1, resistance R ₂212 resistance is R2, resistance R ₃213 resistance is R3, resistance R ₄214 resistance is R4, resistance R ₅215 resistance is R5, resistance R ₆216 resistance is R6, resistance R ₇217 resistance is R7, resistance R ₈218 resistance is R8, capacitor C ₁221 appearance value is C1, capacitor C ₂222 appearance value is C2, and the input signal of signal input part 201 is U1, and the input signal of signal output part 202 is U2, then has:

The transport function of analog signal processing circuit is:

$T_S=\frac{1}{C1\·R2\·C2\·R3\·S^2+C2(R2+R3)S+1}\·\frac{R4}{R1+R4}\·\frac{R8}{R7+R8},$

Therefore, the free-running frequency of this analog signal processing circuit and ratio of damping are respectively:

${\mathrm{\ω}}_n=\frac{1}{\sqrt{C1\·R2\·C2\·R3}},$

$\mathrm{\ξ}=\frac{R2+R3}{2}\sqrt{\frac{C2}{C1\·R2\·R3}},$

When R2=R3=R:

${\mathrm{\ω}}_n=\frac{1}{R\sqrt{C1\·C2}},$

$\mathrm{\ξ}=\sqrt{\frac{C2}{C1}}=\sqrt{2}$

By $T_S=\frac{1}{C1\·R2\·C2\·R3\·S^2+C2(R2+R3)S+1}\·\frac{R4}{R1+R4}\·\frac{R8}{R7+R8}$ As can be known, this circuit gain is subject to R ₁, R ₄, R ₇, R ₈, regulate the numerical value of these four parameters, can make it to be applicable to different space multi-spectral remote sensor CCD analog signal processing by calculating the yield value of this circuit.

By ${\mathrm{\ω}}_n=\frac{1}{R\sqrt{C1\·C2}}$ As can be known, this circuit bandwidth is subject to R, C ₁, C ₂, regulate the numerical value of these three parameters, can make it to be applicable to different space multi-spectral remote sensor CCD analog signal processing by calculating the bandwidth value of this circuit.

By $\mathrm{\ξ}=\sqrt{2}$ As can be known, this circuit has best flat type on frequency domain, is suitable for the processing to space multi-spectral remote sensor CCD simulating signal.

By following formula as can be known, the utility model space multi-spectral remote sensor CCD analog signal processing circuit both can have been realized the multistage adjusting of signal gain, can regulate the bandwidth of analog signal processing circuit again according to actual needs, make it the noise information in the better filtering useful signal, for the back level provides superior in quality input.

Need to prove all resistance in the utility model, i.e. resistance R ₁211 or resistance R ₂212 or resistance R ₃213 or resistance R ₄214 or resistance R ₅215 or resistance R ₆216 or resistance R ₇217 or resistance R ₈218 all can parallel resistance.

The content that is not described in detail in the utility model instructions belongs to those skilled in the art's known technology.

Claims (6)

1, space multi-spectral remote sensor CCD analog signal processing circuit is characterized in that comprising: operational amplifier (231), resistance R ₁(211), resistance R ₂(212), resistance R ₃(213), resistance R ₄(214), resistance R ₅(215), resistance R ₆(216), resistance R ₇(217), resistance R ₈(218), capacitor C ₁(221) and capacitor C ₂(222), signal input part (201) is successively through resistance R ₁(211), resistance R ₂(212), resistance R ₃(213) link to each other resistance R with the positive input (243) of operational amplifier (231) ₁(211) and resistance R ₂(212) tie point (241) passes through resistance R ₄(214) link to each other resistance R with reference potential ₂(212) and resistance R ₃(213) tie point (242) passes through capacitor C ₁(221) link to each other with the output terminal (245) of operational amplifier (231), the positive input (243) of operational amplifier (231) also passes through capacitor C ₂(222) link to each other with reference potential, the negative input (244) of operational amplifier (231) passes through resistance R ₆(216) link to each other with reference potential, the negative input (244) of operational amplifier (231) also passes through resistance R ₅(215) link to each other with the output terminal (245) of operational amplifier (231), the output terminal (245) of operational amplifier (231) passes through resistance R ₇(217) link to each other with signal output part (202), signal output part (202) also passes through resistance R ₈(218) link to each other with reference potential.

2, space multi-spectral remote sensor CCD analog signal processing circuit according to claim 1 is characterized in that: described resistance R ₂(212) resistance and described resistance R ₃(213) resistance equates.

3, space multi-spectral remote sensor CCD analog signal processing circuit according to claim 1 is characterized in that: described resistance R ₅(215) resistance and described resistance R ₆(216) resistance equates.

4, space multi-spectral remote sensor CCD analog signal processing circuit according to claim 1 is characterized in that: described resistance R ₇(217) resistance and described resistance R ₈(218) resistance equates.

5, space multi-spectral remote sensor CCD analog signal processing circuit according to claim 1 is characterized in that: described capacitor C ₂(222) appearance value is described capacitor C ₁(221) 2 times of appearance value.

6, space multi-spectral remote sensor CCD analog signal processing circuit according to claim 1 is characterized in that: described resistance R ₁(211) or resistance R ₂(212) or resistance R ₃(213) or resistance R ₄(214) or resistance R ₅(215) or resistance R ₆(216) or resistance R ₇(217) or resistance R ₈(218) can parallel resistance.

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