CN100391101C - Limiting amplifier for PSD photoelectric signal - Google Patents
Limiting amplifier for PSD photoelectric signal Download PDFInfo
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- CN100391101C CN100391101C CNB021448809A CN02144880A CN100391101C CN 100391101 C CN100391101 C CN 100391101C CN B021448809 A CNB021448809 A CN B021448809A CN 02144880 A CN02144880 A CN 02144880A CN 100391101 C CN100391101 C CN 100391101C
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- operational amplifier
- amplifier
- resistance
- resistor
- signal
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Abstract
The present invention belongs to an amplifying technique, more specifically a PSD photoelectric signal ultimate amplifier. The PSD photoelectric signal ultimate amplifier is composed of an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistors, a first capacitor and a second capacitor, wherein the negative input end of the operational amplifier is connected with the first capacitor and the second resistor to form a signal passage of the operational amplifier, the operational amplifier is grounded via the first resistor, and the output end has six pins; an amplification feedback loop of the operational amplifier is formed by the second capacitor and the third resistor, and is connected with the feedback end of the operational amplifier; and the fourth resistor and the fifth resistor are respectively connected with the positive input end and the reference voltage end of the operational amplifier so as to regulate the stability of the amplifier. The PSD photoelectric signal ultimate amplifier is an alternating-current small-signal ultimate amplifier which can furthest utilize the magnifying performance of the operational amplifier and has excellent restraining effect to noise.
Description
Technical field
The invention belongs to amplifying technique, specifically a kind of PSD photosignal limit amplifier.
Background technology
In the prior art, typical voltage signal amplifier generally is that linear (ratio) amplifies.Promptly by setting the amplification of feedback resistance realization to input voltage signal.Usually such amplifier has not only amplified signal, has also amplified noise signal simultaneously.That therefore the multiplication factor of one-level amplifier can not be done is very big.In the practical application, have many occasions to be used device (as electrooptical device) restriction, the signal of telecommunication of acquisition is very weak, and with various noises.Therefore to gather the useful signal of enough energy (amplitude), often need modulate, at receiving terminal the signal of telecommunication be adopted multistage amplification then, and add various filter circuits, to guarantee effectively detecting and gathering to small and weak signal to signal source (as light source).Therefore sort signal collection amplifying circuit is a more complicated usually.
Summary of the invention
The object of the present invention is to provide a kind of can amplification performance more excellent, PSD photosignal limit amplifier of noise being had fabulous inhibition effect again.
To achieve these goals, technical scheme of the present invention is: described operational amplifier negative input end links to each other with first electric capacity, second resistance, constitutes the operational amplifier signal path, and input signal is a signal source, and through first grounding through resistance, output is 6 pin; Described second electric capacity, the 3rd resistance constitute operational amplifier and amplify feedback loop, connect the operational amplifier feedback end, and the 4th resistance, the 5th resistance connect operational amplifier positive input terminal, reference voltage end respectively, resonance-amplifier stability.
The present invention compared with prior art has following beneficial effect:
Amplification performance more excellent, noise is had fabulous inhibition effect again.Amplifier provided by the invention can utilize the performance of operational amplifier spare, by improvement to feedback circuit, realized limit amplification (can be amplified to thousands of times even thousands of times effectively) with containing the input of stabilized frequency alternation small-signal to the weak signal of modulation, simultaneously background and electrical noise have been produced fabulous inhibition effect again, collection amplifies and is filtered into one, adopts the useful signal that amplifier of the present invention can be stablized, signal to noise ratio is good, amplitude is big.Have tangible novelty and practicality.
2. simple in structure, applied range.The present invention is applied to the preposition amplification of PSD photoelectrical position sensor analog signal output and detects, and has obtained extraordinary signal and has detected effect.Compare with the classical signal amplifier, the amplification filtering effect of its analog quantity small-signal is very obvious, and then the present invention is particularly useful for being submerged in the preposition amplification of the modulation weak signal in the noise.
Description of drawings
Fig. 1 is structural representation of the present invention and design sketch.
Embodiment
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
As shown in Figure 1, 2, the present invention is made up of operational amplifier F, the first～five resistance R, 1～R5, the first～two capacitor C, 1～C2, wherein: described operational amplifier F negative input end (2 pin) links to each other with first capacitor C 1, second resistance R 2, constitute operational amplifier F signal path, and through first resistance R, 1 ground connection, input signal is a signal source; Output OUT is 6 pin; Second capacitor C 2, the 3rd resistance R 3 constitute operational amplifier F and amplify feedback loops, connect operational amplifier F feedback end (1,8 pin), the 4th resistance R 4, the 5th resistance R 5 connect respectively operational amplifier F positive input terminal, reference voltage end (3,
The principle of the invention is:
Operational amplifier F can adopt instrument amplifier, and model is AD620, and it has signal amplifying power and electric property preferably.The key of circuit has been to use first capacitor C 1 and 2 two electric capacity of second capacitor C as signal path and amplification feedback loop device, and its amount of capacity is relevant with the frequency of signal: when the modulation signal that receives was 20KHz, capacitance was 104 (0.01 microfarads).Second resistance R 2 is the load resistance of input signal, and first resistance R 1 is the leakage resistance that unloads of operational amplifier, and the 3rd resistance R 3 is for amplifying feedback resistance, and the 4th resistance R 4 and the 5th resistance R 5 are used for resonance-amplifier stability, are generally less than 10K.
Technical performance: when signal source is the alternating voltage signal of fixed frequency, the source signal that reaches 1: 1 less than millivolt level, signal to noise ratio can be amplified to the volt level through the present invention, signal amplification factor can reach more than thousand times, and noise signal is constant substantially.Therefore, be used for the amplification of ac small signal and the signal to noise ratio of raising signal and have very desirable effect.
Claims (1)
1. PSD photosignal limit amplifier, it is characterized in that: by operational amplifier, the first～five resistance (R1～R5), the first～two electric capacity (C1～C2) form, wherein: described operational amplifier (F) negative input end links to each other with first electric capacity (C1), second resistance (R2), constitute the operational amplifier signal path, the signal of first electric capacity (C1), the continuous input point of second resistance (R2) is a signal source, and through first resistance (R1) ground connection, output (OUT) is 6 pin; Described second electric capacity (C2), the 3rd resistance (R3) constitute operational amplifier and amplify feedback loop, connect operational amplifier (F) feedback end after second electric capacity (C2), the 3rd resistance (R3) parallel connection, the 4th resistance (R4), the 5th resistance (R5) connect operational amplifier (F) positive input terminal, reference voltage end, resonance-amplifier stability respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021448809A CN100391101C (en) | 2002-11-20 | 2002-11-20 | Limiting amplifier for PSD photoelectric signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021448809A CN100391101C (en) | 2002-11-20 | 2002-11-20 | Limiting amplifier for PSD photoelectric signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1503450A CN1503450A (en) | 2004-06-09 |
| CN100391101C true CN100391101C (en) | 2008-05-28 |
Family
ID=34232150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021448809A Expired - Fee Related CN100391101C (en) | 2002-11-20 | 2002-11-20 | Limiting amplifier for PSD photoelectric signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100391101C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2182994Y (en) * | 1993-08-30 | 1994-11-16 | 陈权孝 | High output type sensor for pressure |
| CN2465401Y (en) * | 2001-02-19 | 2001-12-12 | 中国科学院长春地理研究所 | Differential square law detecting circuit |
| US20020098808A1 (en) * | 1999-06-24 | 2002-07-25 | Thomas Bartl | Circuit configuration for matching an amplifier to a radio-frequency line, and use of the circuit configuration |
| US20020163407A1 (en) * | 2001-03-19 | 2002-11-07 | Koninklijke Philips Electronics N.V. | Circuit and method for input side impedance matching of a power amplifier in an electronic device |
-
2002
- 2002-11-20 CN CNB021448809A patent/CN100391101C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2182994Y (en) * | 1993-08-30 | 1994-11-16 | 陈权孝 | High output type sensor for pressure |
| US20020098808A1 (en) * | 1999-06-24 | 2002-07-25 | Thomas Bartl | Circuit configuration for matching an amplifier to a radio-frequency line, and use of the circuit configuration |
| CN2465401Y (en) * | 2001-02-19 | 2001-12-12 | 中国科学院长春地理研究所 | Differential square law detecting circuit |
| US20020163407A1 (en) * | 2001-03-19 | 2002-11-07 | Koninklijke Philips Electronics N.V. | Circuit and method for input side impedance matching of a power amplifier in an electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1503450A (en) | 2004-06-09 |
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