CN103219962B - Programmable-gain isolating amplifier circuit and its implementation - Google Patents
Programmable-gain isolating amplifier circuit and its implementation Download PDFInfo
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Abstract
The invention belongs to isolating amplifier circuit technical field, especially relate to a kind of programmable-gain isolating amplifier circuit and its implementation, programmable-gain isolating amplifier circuit comprises isolated location U
1, Programmable Gain Amplifier Circuit, isolated location U
1comprise input, conversion electric capacity, microelectronic digital single-pole double-throw switch (SPDT), gating signal, the control signal of microelectronic digital switch, Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier, programmable resistive network, gain measurement circuit, programmable resistive network is made up of digital regulation resistance, gain measurement circuit comprises digital switch, normal voltage, the control signal of digital switch.Programmable-gain isolating amplifier circuit of the present invention can realize " completely isolated " between signal end and amplifier, can overcome " drift " phenomenon of amplifying circuit, and gain selection continuity is strong, significantly improves amplification precision.
Description
Technical field
The invention belongs to isolating amplifier circuit technical field, especially relate to a kind of programmable-gain isolating amplifier circuit and its implementation.
Background technology
In reality, there is a lot of informational needs collection, become the information that can use.Back ground Information is changed by signal to form.Occurring in nature signal has two large classes, and a class is analog signal, and it is continuous in time or changes signal slowly; Another kind of is the signal being interrupted change in time, is referred to as digital signal, and it can be used for digital processing, or gives computer disposal.But be analog signal in a large number in reality, it is extracted by various transducer.
Analog signal, generally not of uniform size, wherein a part is tiny signal, when using further, need amplify.In amplification process, in order to improve transmitting accuracy, also should ensure that signal has suitable amplitude, this just requires the gain-variable of amplifying circuit, and namely range is variable.In the detection, control circuit in each field of actual field; in order to improve the functional reliability of whole system, protection personal safety and device security, reduce interference and noise; often will take electric isolution measure completely in signal transmission passage, isolation is also the most effective means suppressing common mode disturbances.So-called " completely ", refers to segregate two parts circuit, without any public tie point, comprises ground wire and power supply.Analog signal is when amplifying, and for preventing various interference, the jamproof isolation skill of normal employing is asked, and this is one of important measures of Analog signals amplification.Analog signal is when amplifying, and another problem is exactly amplifying circuit temperature influence and fluctuates--null offset.It is that one of key factor of precision is amplified in impact, and general being difficult to presses down brush.
In existing Signal Isolation Technology:
1) have and adopt midget relay to carry out signal isolation, the effect of isolation still can, but speed is slow, volume and power consumption is large, the life-span is low;
2) adopt precision photoelectric coupler isolation, its circuit is simple, and the effect of this isolation is all right, but linearly poor when shortcoming is small-signal, in the occasion that required precision is high, can not use;
3) adopt magnetic or transformer isolation, this isolation effective, but technical sophistication, valency be expensive, volume and power consumption large, have signal can not directly adopt, as direct current signal;
4) adopt electric current to isolate between input circuit and output circuit, technical sophistication, some occasion can not use;
In existing signal Programmable Gain Amplifier Circuit technology:
1) feedback resistive network of amplifying circuit adopts microswitch to control, and can change amplifying circuit gain, but can not automation;
2) feedback resistive network of amplifying circuit adopts electronic switch to control, and can change amplifying circuit gain, but the resistance value in feedback resistive network is fixing, can not continuously changes, namely can not continuously change amplifying circuit gain;
3) digital control programmable gain amplifier, it is specially for the aspects such as data acquisition system (DAS), dynamic gain change and automatic growth control apply and design that the LTC6910 series digit produced as Linear Tech (LTC) controls programmable gain amplifier (PGA) monolithic IC.But determine that the resistance of multiplication factor is still fixing, so amplifying circuit gain can not continuous variable.
Summary of the invention
The object of this invention is to provide a kind of programmable-gain isolating amplifier circuit, amplify precision through this isolating amplifier circuit isolation amplifying signal high, gain selection continuity is strong, and can realize the completely isolated of signal end and amplifier.
The object of the invention is to be realized by following technical proposals:
Programmable-gain isolating amplifier circuit of the present invention, is characterized in that comprising isolated location U
1, Programmable Gain Amplifier Circuit,
Described isolated location U
1comprise input B1, B2 and B3, conversion electric capacity C1 and C2, microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, gating signal GL, the control signal D0 of microelectronic digital single-pole double-throw switch (SPDT),
Gating isolated location U1, signal is by B1, B2 and B3 holds input, in parallel with conversion electric capacity C1 and C2, at microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, under the control of the control signal D0 of gating signal GL and microelectronic digital single-pole double-throw switch (SPDT), first by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, be connected on the left side and receive input signal, exist on conversion electric capacity C1 and C2, again by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22 is connected on the right, input signal is given to Programmable Gain Amplifier Circuit from conversion electric capacity C1 and C2 amplify, at this moment Programmable Gain Amplifier Circuit and input signal end " completely " are isolated,
Described Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier U2, programmable resistive network U3, gain measurement circuit U 4, described programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and described gain measurement circuit U 4 comprises digital switch K1, K2, normal voltage Vb, the control signal D1 of digital switch
Programmable Gain Amplifier Circuit, comprise accurate integrated operational amplifier U2, programmable resistive network U3, programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and this programmable resistive network U3 is the digital regulation resistance of use 8, a digital regulation resistance can produce 256 kinds of resistance values, in order to change the gain of amplifying circuit, the resistance value of digital regulation resistance provides programmable gain amplifier signal by external embedded microcomputer
The actual gain of amplifying circuit was measured at that time: in order to reduce the impact of variations in temperature on amplifying circuit precision, namely " drift " is eliminated, before each signal of amplification, first should survey amplifying circuit gain amplifier at that time, namely start gain measurement circuit U 4, the control signal D1 of digital switch is thrown low level, digital switch K1 is connected, disconnect digital switch K2, Programmable Gain Amplifier Circuit input end grounding, measures output Vout0 at that time; The control signal D1 of digital switch is thrown high level, and digital switch K1 is disconnected, and digital switch K2 connects, and Programmable Gain Amplifier Circuit input access normal voltage Vb, measures output Voutb at that time,
Then the actual gain of amplifying circuit is at that time:
K
at that time=(Voutb-Vout0)/Vb.
Described digital regulation resistance SD1, SD2 and SD3 are 8 bit digital potentiometers.
Based on an implementation method for programmable-gain isolating amplifier circuit, it is characterized in that comprising isolated location U
1, Programmable Gain Amplifier Circuit,
Described isolated location U
1comprise input B1, B2 and B3, conversion electric capacity C1 and C2, microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, gating signal GL, the control signal D0 of microelectronic digital single-pole double-throw switch (SPDT),
Described Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier U2, programmable resistive network U3, gain measurement circuit U 4, described programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and described gain measurement circuit U 4 comprises digital switch K1, K2, normal voltage Vb, the control signal D1 of digital switch
The implementation method of programmable-gain isolating amplifier circuit comprises the steps:
1) gating isolated location U1, signal is by B1, B2 and B3 holds input, in parallel with conversion electric capacity C1 and C2, at microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, under the control of the control signal D0 of gating signal GL and microelectronic digital single-pole double-throw switch (SPDT), first by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, be connected on the left side and receive input signal, exist on conversion electric capacity C1 and C2, again by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22 is connected on the right, input signal is given to Programmable Gain Amplifier Circuit from conversion electric capacity C1 and C2 amplify, at this moment Programmable Gain Amplifier Circuit and input signal end " completely " are isolated,
2) actual gain of amplifying circuit is measured at that time: in order to reduce the impact of variations in temperature on amplifying circuit precision, namely " drift " is eliminated, before each signal of amplification, first should survey amplifying circuit gain amplifier at that time, namely start gain measurement circuit U 4, the control signal D1 of digital switch is thrown low level, digital switch K1 is connected, disconnect digital switch K2, Programmable Gain Amplifier Circuit input end grounding, measures output Vout0 at that time; The control signal D1 of digital switch is thrown high level, and digital switch K1 is disconnected, and digital switch K2 connects, and Programmable Gain Amplifier Circuit input access normal voltage Vb, measures output Voutb at that time.
Then the actual gain of amplifying circuit is at that time:
K
at that time=(Voutb-Vout0)/Vb;
3) Programmable Gain Amplifier Circuit, comprise accurate integrated operational amplifier U2, programmable resistive network U3, programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and this programmable resistive network U3 is the digital regulation resistance of use 8, and a digital regulation resistance can produce 256 kinds of resistance values, in order to change the gain of amplifying circuit, the resistance value of digital regulation resistance provides programmable gain amplifier signal by external embedded microcomputer.
Advantage of the present invention:
(1) the present invention adopts the signal switching method of two precision capacitance and the two Zheng Kaiguan of digital micro hilted broadsword, achieves " completely isolated " between signal end and amplifier;
(2) Programmable Gain Amplifier Circuit, have employed the method for actual measurement " at that time gain ", and this is the effective measures eliminating amplifying circuit " drift ", can significantly improve amplification precision;
(3) Programmable Gain Amplifier Circuit, adopt the programmable-gain transform method be made up of digital regulation resistance, the effective measures realizing the continuous Based Intelligent Control of amplifying circuit gain, because use the digital regulation resistance of 8, a digital regulation resistance can produce 256 kinds of resistance values, only adopts several resistance compared with in prior art, improve significantly, and in resistor network, form coarse adjustment and fine tuning circuit again, programmable-gain can be selected close to continuous print.
Accompanying drawing explanation
Fig. 1 is network data acquirer theory diagram;
Fig. 2 is the schematic diagram of programmable-gain isolating amplifier circuit of the present invention;
Fig. 3 is the schematic diagram of programmable-gain isolating amplifier circuit thermal resistance of the present invention access.
Embodiment
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
Network data acquirer theory diagram as shown in Figure 1, comprises signal access unit, signal conversion unit, isolation amplifying unit, embedded microcomputer and various gating signal and control signal.Wherein isolating amplifying unit is the reliable isolation realized signal conversion unit and amplifying circuit, disturbs with ride gain amplifying circuit and front end.Isolating amplifier circuit of the present invention can simultaneously according to the size of signal in the application of isolation amplifying unit, and the gain of its amplifying circuit selected, namely selects range, so be referred to as programmable-gain isolating amplifier circuit automatically.
Programmable-gain isolating amplifier circuit of the present invention, is characterized in that comprising isolated location U
1, Programmable Gain Amplifier Circuit.
Embodiment 1: the signal that signal conversion unit is sent is non-thermal resistance signal.
As shown in Figure 2, described isolated location U
1comprise input B1, B2 and B3, conversion electric capacity C1 and C2, microelectronic digital switches set KC11, KC12, KC21 and KC22, gating signal GL, the control signal D0 of microelectronic digital single-pole double-throw switch (SPDT), when to receive signal that signal conversion unit sends be non-thermal resistance signal to gating isolated location U1, input B1 and B2 by gating isolated location U1 accesses, and B2 and B3 holds now no signal input.At this moment, control signal D0 low level signal of microelectronic digital single-pole double-throw switch (SPDT) is defeated by by embedded microcomputer, KC11, KC12, KC21, KC22 is made all to be combined in the left side, at this moment Zhuan Change electric capacity C1 and C2 is in receiving state signal, give control signal D0 high level signal of microelectronic digital single-pole double-throw switch (SPDT) again, then KC11, KC12, KC21, KC22 are all combined in the right side, by signal access Programmable Gain Amplifier Circuit, amplify.Now KC11, KC12, KC21, KC22 and B1, B2 and B3 end is in off-state, is namely in and Programmable Gain Amplifier Circuit isolation, therefore is referred to as " completely isolated ".
Described Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier U2, programmable resistive network U3, gain measurement circuit U 4, described programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, this digital regulation resistance uses the digital regulation resistance of 8, a digital regulation resistance can produce 256 kinds of resistance values, several resistance is only adopted compared with in prior art, improve significantly, digital regulation resistance accepts to control from the amplification gating of embedded microcomputer, namely according to wanting amplifying signal to carry out selected suitable multiplication factor, control also known as programming gain, signal Vout after amplification exports to embedded microcomputer by accurate integrated operational amplifier U2.
Described gain measurement circuit U 4 comprises digital switch K1, K2, normal voltage Vb, the control signal D1 of digital switch, is used for surveying " at that time gain ".When " at that time gain " measures, first the control signal D1 of the digital switch in gain measurement circuit U 4 is placed in low level, digital switch K1 is closed, even if the input end grounding of accurate integrated operational amplifier U2, record gain measurement circuit U 4 output end voltage Vout0, again the control signal D1 of digital switch is placed in high level, digital switch K1 is disconnected, K2 closes, gain measurement circuit U 4 inputs termination normal voltage Vb, measure gain measurement circuit U 4 output end voltage Voutb, then the actual gain of amplifying circuit is at that time:
K
at that time=(Voutb-Vout0)/Vb;
Use K
at that timeadjust amplifying signal, namely eliminate the drift of amplifying circuit, considerably improve the amplification precision of signal.Work as K
at that timewhen having surveyed, K1, K2 are disconnected, to receive next signal.
Embodiment 2: the signal that signal conversion unit is sent is thermal resistance signal.
As shown in Figure 3, when to receive signal that signal conversion unit sends be thermal resistance signal to isolated location U1, input B1 and B2 meets thermal resistance Rt, and B2 and B3 termination enters the lead-in wire of thermal resistance Rt, because when using Thermistor Temperature Measurement, deduct the pressure drop on wire.: make microelectronic digital switches set KC11, KC12, KC21, KC22 be all combined in the left side that conversion electric capacity C1 receives the electric Vc1 on thermal resistance Rt by course of work during Thermistor Temperature Measurement
(upper+, under-), conversion electric capacity C2 receives thermal resistance Rt lead-in wire voltage V
lead-in wire (upper+, under-), when microelectronic digital switches set KC11, KC12, KC21, KC22 are all combined in the right side, will the upper end ground connection of conversion electric capacity C2, under terminate to C1 lower end, i.e. Vc1-V
lead-in wire.Like this, the impact that thermal resistance Rt goes between just has been deducted.
Based on an implementation method for programmable-gain isolating amplifier circuit, it is characterized in that: comprise isolated location U
1, Programmable Gain Amplifier Circuit,
Described isolated location U
1comprise input B1, B2 and B3, conversion electric capacity C1 and C2, microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, gating signal GL, the control signal D0 of microelectronic digital single-pole double-throw switch (SPDT),
Described Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier U2, programmable resistive network U3, gain measurement circuit U 4, described programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and described gain measurement circuit U 4 comprises digital switch K1, K2, normal voltage Vb, the control signal D1 of digital switch
The implementation method of programmable-gain isolating amplifier circuit comprises the steps:
1) gating isolated location U1, signal is by B1, B2 and B3 holds input, in parallel with conversion electric capacity C1 and C2, at microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, under the control of the control signal D0 of gating signal GL and microelectronic digital single-pole double-throw switch (SPDT), first by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, be connected on the left side and receive input signal, exist on conversion electric capacity C1 and C2, again by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22 is connected on the right, input signal is given to Programmable Gain Amplifier Circuit from conversion electric capacity C1 and C2 amplify, at this moment Programmable Gain Amplifier Circuit not input signal end " completely " isolation,
2) actual gain of amplifying circuit is measured at that time: in order to reduce the impact of variations in temperature on amplifying circuit precision, namely " drift " is eliminated, before each signal of amplification, first should survey amplifying circuit gain amplifier at that time, namely start gain measurement circuit U 4, the control signal D1 of digital switch is thrown low level, digital switch K1 is connected, disconnect digital switch K2, Programmable Gain Amplifier Circuit input end grounding, measures output Vout0 at that time; The control signal D1 of digital switch is thrown high level, and digital switch K1 is disconnected, and digital switch K2 connects, and Programmable Gain Amplifier Circuit input access normal voltage Vb, measures output Voutb at that time.
Then the actual gain of amplifying circuit is at that time:
K
at that time=(Voutb-Vout0)/Vb;
3) Programmable Gain Amplifier Circuit, comprise accurate integrated operational amplifier U2, programmable resistive network U3, programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and this programmable resistive network U3 is the digital regulation resistance of use 8, and a digital regulation resistance can produce 256 kinds of resistance values, in order to change the gain of amplifying circuit, the resistance value of digital regulation resistance provides programmable gain amplifier signal by external embedded microcomputer.
Claims (2)
1. a programmable-gain isolating amplifier circuit, is characterized in that comprising isolated location U
1, Programmable Gain Amplifier Circuit,
Described isolated location U
1comprise input B1, B2 and B3, conversion electric capacity C1 and C2, microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, gating signal GL, the control signal D0 of microelectronic digital single-pole double-throw switch (SPDT),
Gating U1, signal is by B1, B2 and B3 holds input, in parallel with conversion electric capacity C1 and C2, at microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, under the control of the control signal D0 of gating signal GL and microelectronic digital single-pole double-throw switch (SPDT), first by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, be connected on the left side and receive input signal, exist on conversion electric capacity C1 and C2, again by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22 is connected on the right, input signal is given to Programmable Gain Amplifier Circuit from conversion electric capacity C1 and C2 amplify, at this moment Programmable Gain Amplifier Circuit and input signal end " completely " are isolated,
Described Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier U2, programmable resistive network U3, gain measurement circuit U 4, described programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and described gain measurement circuit U 4 comprises digital switch K1, K2, normal voltage Vb, the control signal D1 of digital switch
Described programmable resistive network U3 is the digital regulation resistance of use 8, and a digital regulation resistance can produce 256 kinds of resistance values, and in order to change the gain of amplifying circuit, the resistance value of digital regulation resistance provides programmable gain amplifier signal by external embedded microcomputer,
The actual gain of amplifying circuit was measured at that time: in order to reduce the impact of variations in temperature on amplifying circuit precision, namely " drift " is eliminated, before each signal of amplification, first should survey amplifying circuit gain amplifier at that time, namely start gain measurement circuit U 4, the control signal D1 of digital switch is thrown low level, digital switch K1 is connected, disconnect digital switch K2, Programmable Gain Amplifier Circuit input end grounding, measures output Vout0 at that time; The control signal D1 of digital switch is thrown high level, and digital switch K1 is disconnected, and digital switch K2 connects, and Programmable Gain Amplifier Circuit input access normal voltage Vb, measures output Voutb at that time,
Then the actual gain of amplifying circuit is at that time:
K
at that time=(Voutb-Vout0)/Vb.
2. based on an implementation method for programmable-gain isolating amplifier circuit, it is characterized in that: programmable-gain isolating amplifier circuit comprises isolated location U
1, Programmable Gain Amplifier Circuit,
Described isolated location U
1comprise input B1, B2 and B3, conversion electric capacity C1 and C2, microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, gating signal GL, the control signal D0 of microelectronic digital single-pole double-throw switch (SPDT),
Described Programmable Gain Amplifier Circuit comprises accurate integrated operational amplifier U2, programmable resistive network U3, gain measurement circuit U 4, described programmable resistive network U3 is by digital regulation resistance SD1, SD2 and SD3 formed, and described gain measurement circuit U 4 comprises digital switch K1, K2, normal voltage Vb, the control signal D1 of digital switch
This programmable resistive network U3 is the digital regulation resistance of use 8, and a digital regulation resistance can produce 256 kinds of resistance values, and in order to change the gain of amplifying circuit, the resistance value of digital regulation resistance provides programmable gain amplifier signal by external embedded microcomputer,
The implementation method of programmable-gain isolating amplifier circuit comprises the steps:
1) gating isolated location U1, signal is by B1, B2 and B3 holds input, in parallel with conversion electric capacity C1 and C2, at microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, under the control of the control signal D0 of gating signal GL and microelectronic digital single-pole double-throw switch (SPDT), first by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22, be connected on the left side and receive input signal, exist on conversion electric capacity C1 and C2, again by microelectronic digital single-pole double-throw switch (SPDT) KC11, KC12, KC21 and KC22 is connected on the right, input signal is given to Programmable Gain Amplifier Circuit from conversion electric capacity C1 and C2 amplify, at this moment Programmable Gain Amplifier Circuit and input signal end " completely " are isolated,
2) actual gain of amplifying circuit is measured at that time: in order to reduce the impact of variations in temperature on amplifying circuit precision, namely " drift " is eliminated, before each signal of amplification, first should survey amplifying circuit gain amplifier at that time, namely start gain measurement circuit U 4, the control signal D1 of digital switch is thrown low level, digital switch K1 is connected, disconnect digital switch K2, Programmable Gain Amplifier Circuit input end grounding, measures output Vout0 at that time; The control signal D1 of digital switch is thrown high level, and digital switch K1 is disconnected, and digital switch K2 connects, and Programmable Gain Amplifier Circuit input access normal voltage Vb, measures output Voutb at that time;
Then the actual gain of amplifying circuit is at that time:
K
at that time=(Voutb-Vout0)/Vb.
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|---|---|---|---|---|
| CN1079345A (en) * | 1992-05-16 | 1993-12-08 | 丘雪明 | Capacity coupled isolated amplifier |
| CN1367629A (en) * | 2001-01-20 | 2002-09-04 | 三星电子株式会社 | Electric efficiency raising circuit of radio-frequency power amplifier in double-mode mobile telephone |
| EP2197109A1 (en) * | 2008-12-15 | 2010-06-16 | STMicroelectronics Srl | Integrated programmable gain amplifier circuit and system including said circuit |
| CN103018530A (en) * | 2012-12-06 | 2013-04-03 | 杭州成功超声电源技术有限公司 | Ultrasonic power supply current detection circuit |
| CN203243287U (en) * | 2013-04-15 | 2013-10-16 | 鞍钢集团矿业公司 | Programmable gain isolation amplifying circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7605659B2 (en) * | 2006-09-07 | 2009-10-20 | National Semiconductor Corporation | Gain adjustment for programmable gain amplifiers |
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2013
- 2013-04-15 CN CN201310128774.8A patent/CN103219962B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079345A (en) * | 1992-05-16 | 1993-12-08 | 丘雪明 | Capacity coupled isolated amplifier |
| CN1367629A (en) * | 2001-01-20 | 2002-09-04 | 三星电子株式会社 | Electric efficiency raising circuit of radio-frequency power amplifier in double-mode mobile telephone |
| EP2197109A1 (en) * | 2008-12-15 | 2010-06-16 | STMicroelectronics Srl | Integrated programmable gain amplifier circuit and system including said circuit |
| CN103018530A (en) * | 2012-12-06 | 2013-04-03 | 杭州成功超声电源技术有限公司 | Ultrasonic power supply current detection circuit |
| CN203243287U (en) * | 2013-04-15 | 2013-10-16 | 鞍钢集团矿业公司 | Programmable gain isolation amplifying circuit |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Anshan Iron & Steel Group Mining Co., Ltd. |