Dark current compensating circuit
阅读：748发布：2023-02-12
专利汇可以提供Dark current compensating circuit专利检索，专利查询，专利分析的服务。并且The disclosure relates to an electrical circuit and method for suppressing the effect of undesirable electrical signal, such as, the dark current of a photomultiplier tube. The circuit comprises, preferably, a current-to-volts amplifier with a feedback that includes a noninverting amplifier and a memory. The method for suppressing the effect of dark current consists of biasing the memory under no light conditions until the output potential of the current-to-volts amplifier is zeroed to the input level and holding the bias while monitoring the output of the current-to-volts amplifier under light conditions.，下面是Dark current compensating circuit专利的具体信息内容。
1. A circuit for suppressing the effect of a given electrical signal which is relatively constant over a determined time period comprising: a. a first circuit means having an output terminal, a fixed potential input terminal, and a conductive path for said electrical signal from said input terminal to said output terminal; b. an amplifying means, the input of which is coupled to said output terminal of said circuit means; c. a capacitive means coupled to the output of said amplifying means, said amplifying means being adapted to bias said capacitive means during a first portion of said time period; d. an isolating means disposed between said output terminal and said capacitive means and isolating said capacitive means from said output terminal during a second portion of said time period; and e. a second circuit means coupled between said capacitive means and said input terminal of said first circuit means and providing a flow path between said capacitive means and said input terminal at least during said second porTion of said time period, whereby the magnitude of the electrical signal at said output terminal resulting from said given electrical signal is reduced at least during said second portion of said time period.
2. The circuit of claim 1 wherein: a. said input of said amplifying means is connected to said output terminal; and b. said isolating mean is connected between and provides a conductive path between said output of said amplifying means and said capacitive mean during said first portion of said time period and isolates said capacitive means from said output of said amplifying means during said second portion of said time period.
3. The circuit of claim 2 wherein said first circuit means is an operational amplifier having a resistive feedback.
4. The circuit of claim 2 wherein said second circuit means is adapted to provide a flow path between said input terminal and said capacitive means during said first and second portions of said time period and said amplifying means is adjustable such that the potential at said output terminal can be set substantially equal to the potential at said input terminal during said first portion of said time period.
5. The circuit of claim 2 wherein said amplifying means is adapted to charge and discharge said capacitive mean during said first portion of said time period in response to fluctuations in said given electrical signal such that the bias charge on said capacitive means is determined by the average value of said given electrical signal.
6. The circuit of claim 5 wherein said capacitive means comprises a short term memory and a long term memory, said short term memory adapted to respond rapidly to said fluctuations and said long term memory adapted to predominate thereby controlling the bias on said capacitive means.
7. A circuit for suppressing the effect of the average value of a given electrical signal, the average being relatively constant over a determined time period, said given electrical signal being present alone during a first portion of said time period and in combination with at least one other electrical signal during a second portion of said time period, said circuit comprising: an operational amplifier having an output terminal and a fixed potential input terminal, resistance feedback connected between said output and input terminals, an adjustable amplifying means connected to said output terminal, a capacitive means coupled to said amplifying means, said amplifying means adapted to charge and discharge said capacitive means during only said first portion of said time period in response to fluctuations in said given electrical signal such that the bias charge on said capacitive means is determined by the average value of said given electrical signal, and resistive means coupled between said capacitive means and said input terminal of said operational amplifier, said resistive means selected such that by adjustment of said adjustable amplifying means, an electrical signal substantially equal to the average of said given electrical signal will flow between said input terminal and said capacitive means during said time period.
8. The circuit of claim 7 wherein said amplifying means includes a pair of transistors connected together through their base terminals and through one other terminal of such that said pair of transistors are alternately driven conductive and nonconductive during said first portion of said time period in response to fluctuations in said given electrical signal, and a control transistor having the conductive path formed by its collector and emitter terminals coupled between said base terminals and said other terminals of said pair of transistors, said control transistor being adapted to turn off said pair of transistors during said second portion of said time period.
9. The circuit of claim 7 wherein said capacitive means comprises a short term memory and a long term memory, said short term memory adapted to respond rapidly to said fluctuations and said long term meMory adapted to predominate thereby controlling the bias on said capacitive means.
10. The circuit of claim 9 wherein said short term memory is a low value capacitor and said long term memory is high value capacitor in combination with a resistor.
11. A method for suppressing the effect of the dark current of a photomultiplier tube comprising: a. passing said dark current through a current-to-volts amplifier; b. biasing with the output of said amplifier and under no-light conditions at least one capacitor coupled to the input and output of said amplifier; c. supplying the current flow from said capacitor to said amplifier input, said biasing being continued until said current flow from said capacitor to said input is sufficient to zero the output potential of said amplifier to its input level under said no-light conditions; and d. maintaining said current flow from said capacitor to said amplifier input while the current from said photomultiplier tube resulting from a reading taken under light conditions is passed through said current-to-volts amplifier whereby the effect of said dark current is suppressed from the results of said reading taken under light conditions at said output of said amplifier.
12. A method for suppressing the effect of the average value of a first electrical signal on a second electrical signal, the average of said first signal being relatively constant during a determined time period comprising: a. passing said first electrical signal through a current-to-volts amplifier; b. biasing with the output of said amplifier at least one capacitor coupled to the input and output of said amplifier during a first portion of said time period; c. supplying the current flow from said capacitor to said amplifier output, said biasing being continued until said current flow from said capacitor to said input is sufficient to zero the output potential of said amplifier to its input level; and d. maintaining said current flow from said capacitor to said amplifier input during a second portion of said time period while said second signal is passed through said current-to-volts amplifier whereby the effect of said first signal is suppressed from said second signal at said output of said amplifier.
13. A circuit for suppressing the effect of the average value of a given electrical signal, the average being relatively constant over a determined time period, said given electrical signal being present alone during a first portion of said time period and in combination with at least one other electrical signal during a second portion of said time period, said circuit comprising: a. an operational amplifier having an output terminal and a fixed potential input terminal; b. a resistance feedback connected between said output and input terminals; c. an adjustable amplifying means, the input of which is coupled to said output terminal; d. a capacitive means coupled to the output of said adjustable amplifying means; e. an isolating means disposed between said output terminal and said capacitive means, during said first portion of said time period and isolating said capacitive means from said output terminal during said second portion of said time period, said amplifying means adapted to bias said capacitive means during said first portion of said time period; and f. a resistive means coupled between said capacitive means and said input terminal of said operational amplifier, said resistive means selected such that by adjustment of said adjustable amplifying means an electrical signal substantially equal to the average of said given electrical signal will flow between said input terminal and said capacitive means during said time period.
14. The circuit of claim 13 wherein: a. said input of said amplifying means is connected to said output terminal; and amplifying b. said isolating means is connected between and provides a conductive path between said output of said adjustable amplifying mEans and said capacitive means, during said first portion of said time period and isolating said capacitive means from said adjustable amplifying means during said second portion of said time period, said amplifying means adapted to bias said capacitive means during only said first portion of said time period.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 一种台面式硅掺砷阻挡杂质带探测器及其制备方法 | 2020-05-11 | 502 |
| 非极性面型BeZnOS合金晶体基MSM紫外光探测器及制备方法 | 2020-05-11 | 156 |
| 一种基于深度学习识别的社区垃圾分类系统及方法 | 2020-05-08 | 918 |
| 基于红外光谱和磁化率测量的斑岩矿床蚀变分带识别方法 | 2020-05-08 | 138 |
| PIIN型高In组分InGaAs探测器材料结构和制备方法 | 2020-05-12 | 145 |
| 单芯片集成型光谱成像微系统光谱数据校正方法 | 2020-05-08 | 135 |
| 一种锌镓氧材料薄膜及其制备方法 | 2020-05-08 | 111 |
| 用于X射线萤光的检测器 | 2020-05-08 | 165 |
| 一种ZnO薄膜紫外探测器件的制备方法 | 2020-05-11 | 599 |
| 固态摄像器件及电子设备 | 2020-05-11 | 929 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈