Small signal amplifier particularly for flow meter monitoring
阅读：726发布：2022-05-24
专利汇可以提供Small signal amplifier particularly for flow meter monitoring专利检索，专利查询，专利分析的服务。并且A monitoring system has a small signal amplifier to amplify the low millivolt signals of a remotely located flowmeter. A pair of transistors are mutually parallel connected in emitter follower configuration by a variable bias potentiometer to the meter through three terminals. Each transistor supplies an input to an analog comparator with resistive and capacitive feedback to provide common mode rejection with a single-ended output signal. An isolating transistor in common collector configuration is connected to the output of the analog comparator for impedance transformation. The transistors are selectively connected to receive either a pair of balanced incoming signals or an unbalanced signal. A reference signal is applied as an input to one of the parallel connected transistors in unbalanced operation.，下面是Small signal amplifier particularly for flow meter monitoring专利的具体信息内容。
1. A small signal amplifying circuit for differentially amplifying a pair of low voltage signals with rejection of common mode voltage signals appearing on said low voltage signals, comprising a signal source means establishing said pair of low voltage signals and including a transducer for establishing at least one of said low voltage signals as a variable signal to be detected, a first and a second high input impedance means connected to the source means and each receiving one of said pair of low voltage signals and the corresponding common mode voltage signal, a first and a second amplifying transistor each connected in an open loop amplifying circuit to said first and second high input impedance means respectively to receive said two input voltage signals and said common mode voltage signals and to establish a pair of output signals including both said input voltage signals and said common mode voltage signals received from said first and second impedance means, and an analog comparator means responsive to the difference voltage and having a first input means connected to said first amplifying transistor and a second input means connected to said second amplifying transistor for combining said pair of output signals supplied by said first and second amplifying transistors and constituting the means for rejecting said common mode voltages with said common mode voltages rejected at the first and second input means and providing a differential comparison between said pair of output signals to supply a single-ended output.
2. The small signal amplifying circuit of claim 1, including an adjustable potentiometer connected to a bias voltage source and connected in common to said first and second amplifying transistors to inversely vary the bias of said first and second amplifying transistors and provide offset bias current and voltage to said analog comparator means to allow accurate common mode rejection.
3. The circuit of claim 1 wherein said signal source includes, a reference signal means connected to the other of said first and second high input impedance means to supply a reference signal from that of the transducer as the second low voltage signal in unbalanced operation.
4. The circuit of claim 1 including, a flow metering means and said transducer means connected to said metering means to establish an output signal proportional to flow, and connecting means to selectively connect said transducer means to at least one of said first and second high input impedance means.
5. The circuit of claim 4, wherein said connecting means is connected to both of said first and second high input impedance means to supply a pair of signals indicative of flow rate in balanced operation.
6. The circuit of claim 4 wherein, said signal source means includes a reference signal means selectively connected to one of said first and second high input impedance means to supply a reference signal, said connecting means selectively connected to the opposite of said first and second high input impedance means tO supply a signal indicative of flow rate in unbalanced operation.
7. The circuit of claim 6, wherein said reference signal means includes a voltage source connected through a variable resistive voltage divider to supply a reference signal.
8. The circuit of claim 1, wherein said first and second high input impedance means each includes a resistor serially connected to a parallel connected resistor, capacitor and Zener diode to supply high input impedance, establish an upper cutoff frequency, and provide overdrive protection for said small signal amplifying circuit.
9. The circuit of claim 1, wherein said analog comparator means employs a parallel connected resistive and capacitive feedback circuit to provide direct current stability with hysteresis to suppress noise and allow high speed feedback response to signal level changes.
10. The circuit of claim 1 including a coupling capacitor connected to said first and second input means of said analog comparator means to short circuit said first and second input means when receiving high frequency noise.
11. The circuit of claim 1 and including an impedance transformation means connected to said analog comparator means and having a low output impedance to allow matching of said small signal amplifying circuit with succeeding circuitry.
12. A small signal amplifying circuit for amplifying low voltage signals received from a remotely located flowmeter, comprising a first and a second input means including a resistor serially connected to a parallel connected resistor, capacitor and Zener diode to supply high input impedance, establish an upper cutoff frequency, and provide overdrive protection for said small signal amplifying circuit, a first and a second amplifying transistor connected in common emitter configuration and connected to said first and second input means respectively to receive at least one low voltage signal and to establish a pair of output signals, an analog comparator means including parallel connected resistive and capacitive feedback circuit to provide direct current stability with hysteresis to suppress noise and allow high speed feedback response to signal level changes, and including a first input means connected to said first amplifying transistor and a second input means connected to said second amplifying transistor to combine said pair of output signals supplied by said first and second amplifying transistors with a coupling capacitor connecting said first and second input means to short circuit when receiving high frequency noise, and an adjustable potentiometer with a center tap connected to a bias voltage source, said adjustable potentiometer connected through a pair of emitter resistors to said first and second amplifying transistors to inversely vary the bias of said first and second amplifying transistors and provide offset bias current and voltage to said analog comparator means to allow accurate common mode rejection.
13. The small signal amplifier of claim 12, including a transducer means connected to said flowmeter to establish an output signal indicative of flow rate, connecting means connected to said transducer means and to said first input means to supply a flow indicative signal, and a reference signal means including a voltage source selectively connected through a variable resistive voltage divider to said second input means to supply a reference signal in unbalanced operation.
14. The small signal amplifier of claim 12, including a transducer means connected to said flowmeter to establish a pair of output signals indicative of flow rate, and connecting means connected to said transducer means and to said first and second input means to supply a pair of flow indicative signals in balanced operation.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 矿用电气设备绝缘数据远程在线测试装置及方法 | 2020-05-08 | 692 |
| 基于调整结构补偿参数的硅微谐振式加速度计温度补偿算法 | 2020-05-13 | 593 |
| 振动式黏弹力传感器的测量电路及测量设备、测量方法 | 2020-05-08 | 775 |
| 一种采集手臂肌电信号的柔性电路板装置 | 2020-05-12 | 686 |
| 一种基于正交斩波调制的多通道人体生理信号采集前端 | 2020-05-14 | 378 |
| 放大器 | 2020-05-14 | 182 |
| 高压母线感应取电装置及方法 | 2020-05-08 | 435 |
| 一种适用于狭小空间的可回程数显式智能扳手 | 2020-05-08 | 17 |
| 无线静态应变测试仪以及无线静态应变测试系统 | 2020-05-11 | 974 |
| 便于进行量值溯源的新型交流充电桩 | 2020-05-12 | 478 |
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