CN114442720A - Common-base current transmission loop-free negative feedback I/V circuit - Google Patents
Common-base current transmission loop-free negative feedback I/V circuit Download PDFInfo
- Publication number
- CN114442720A CN114442720A CN202210097034.1A CN202210097034A CN114442720A CN 114442720 A CN114442720 A CN 114442720A CN 202210097034 A CN202210097034 A CN 202210097034A CN 114442720 A CN114442720 A CN 114442720A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 description 9
- 102100041023 Coronin-2A Human genes 0.000 description 4
- 101000748858 Homo sapiens Coronin-2A Proteins 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
- G05F1/466—Sources with reduced influence on propagation delay
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/59—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including plural semiconductor devices as final control devices for a single load
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to a common-base current transmission I/V circuit without large loop negative feedback, which mainly solves the problems of low working frequency and low transmission speed of a differential circuit formed by a common-emitter circuit. It is known that the actual operating frequency of a transistor is only f under the common emitter connection methodC＝fT/hfeAnd its operating frequency can be close to f under the common base connection methodT. It can be seen that the operating frequency of the common base connection method is improved by h compared with the common emitter connection methodfeThe distortion of the common-base circuit is very small, so that the large loop negative feedback is not considered in the design of the circuit, the circuit is simplified, and the phenomenon of loop delay cannot be generated in the transmission process of the circuit, so that the circuit has the advantages of replacing common emission by the common base and canceling the design of the large loop negative feedback. The circuit belongs to analog electronic technology and is mainly used in a high-speed current transmission circuit or a DAC circuit.
Description
Technical Field
The invention relates to a decoder circuit with I/V common-base conversion, belonging to the analog electronic technology, mainly used in DAC circuit requiring high-speed transmission, in particular to a current transmission I/V circuit using common-base input stage to replace common-emitter differential in-phase input stage and without large loop negative feedback.
The device belongs to analog electronic technology, and is mainly used in high-speed DAC or the field needing high-speed signal transmission.
Background
At present, in the digital era, circuits are developed towards high frequency and high speed, the analog circuits connected with the past digital circuits cannot adapt to the development of the current era, and the differential in-phase input amplifying circuit in the analog circuit is the bottleneck for determining whether the input stage can be developed towards high frequency and high speed.
Disclosure of Invention
To overcome the circuit constitution caused by common emissionThe invention designs an I/V circuit which is composed of a common-base circuit and used for current transmission and voltage conversion, and is used for replacing the original structure of the common-emitter differential circuit. It is known that the actual operating frequency of a transistor is only f under the common emitter connection methodC＝fT/hfeAnd its operating frequency can be close to f under the common base connection methodT. It can be seen that the operating frequency of the common base connection method is improved by h compared with the common emitter connection methodfeThe circuit is simplified because the large loop negative feedback is not considered in the design of the circuit, and the loop delay phenomenon cannot be generated in the transmission process of the circuit, so that the circuit uses common basis to replace common emission and cancels the large loop negative feedback.
The invention discloses a common-base current transmission loop-free negative feedback I/V circuit, which adopts the following scheme for solving the technical problem: DAC chips such as PCM1704 are all of current output type, the common base mode is suitable for current transmission, the distortion of the common base circuit is small, the common base circuit can work in a low distortion state even without large loop negative feedback, the circuit is designed into a common base current transmission circuit and a mirror current source circuit from an input end to an output end to realize high speed of the circuit, a constant current source circuit is connected with a U1 voltage regulator LM317LZ, a constant voltage is formed on R7 (R9) to control the static currents of R3(R6) and R11(R14), and therefore the static currents of R4(R5), Q1(Q2), Q8(Q9) and Q11(Q12) and the static working points of the static currents are controlled.
The invention discloses a negative feedback current transmission I/V circuit without a large loop, which has the working principle that: q1 and Q2 at the input terminals are designed to be in common base form and the respective collectors are connected to the emitters of Q7 and Q10, Q3 collector → R4 → ground → R5 → Q4 collector controls the static current of emitter of Q1 → R1 → Ii → R2 → Q2, and ground controls the virtual ground potential of Ii, similarly, emitter of Q8 → R12 → R10 upper end → R13 → Q9 emitter controls the static current of emitter of Q11 → R15 → Vo → R16 → emitter of Q12, since the static state of IR11 IR14, the static current of IR10 is zero without shunt action, so the static state of VR10 upper end is 0V, and the output Vo is also 0V. In the positive half cycle, the input signal current enters R14 from the + Ii end through an emitter and a collector of R2 and Q2, so that IQE10 is reduced, meanwhile IR1 is reduced, IQE7 is increased, the difference between the two currents is just + IR10 to + Ii, and then IR10 completes the I/V conversion of the positive half cycle; in the negative half cycle, the input signal current flows out of R11 from the end of-Ii through R1, the emitter and the collector of Q1, so that IQE7 is reduced, meanwhile IR2 is reduced, IQE10 is increased, the difference between the two currents is just-IR 10 to-Ii, and then IR10 completes the I/V conversion in the negative half cycle.
The design of Q1 and Q2 using field effect transistors has been considered, so that R3-R6, Q3 and Q4 can be omitted to simplify the circuit, but the N, P transistors of the field effect transistors are difficult to match, and the cost is further increased, so that the design is abandoned.
The invention has the advantages that the negative feedback I/V without the large loop has the following effects: because the differential common-emitter connection is changed into common-base connection and large loop negative feedback is cancelled, the loop delay phenomenon cannot be generated in the circuit transmission process, so that the circuit has high output speed, no transient intermodulation distortion and no input end transient distortion caused by out-of-control negative feedback, phase shift and the like.
Drawings
FIG. 1 is a block diagram of a large loop-free negative feedback current transmission I/V circuit of the present invention.
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Detailed Description
The circuit takes Ii in the attached drawing of the specification as an input end, and the circuit connection mode is as follows: (upper circuit) Ii → R1 → Q1 emitter, collector → R11 lower end (R11 upper end → VCC) → Q7 emitter, collector → Q8 collector and base short, emitter → R12 → R10 → ground, VCC → R3 → Q3 emitter, collector → Q1 base → R4 → ground, VCC → R7 → Q5 emitter, collector and base short → Q3 base, Q7 base coupling, Q5 collector → Vin end of U1 → ADJ → Q6 base, collector short → R8 → Vout end, VCC → Q11 collector, base and Q8 base connection, Q11 emitter → R15 → Vo end; (lower circuit) Ii → R2 → Q2 emitter, collector → R14 upper end (R14 lower end → VEE) → Q10 emitter, collector → Q9 collector and base short circuit, emitter → R13 → R10 → ground, VEE → R6 → Q4 emitter, collector → R5 → ground, VEE → R9 → Q6 emitter, collector and base short circuit with R8 lower end → Q4 base, Q10 base coupling, VEE → Q12 collector, base and Q9 base coupling, Q12 emitter → R16 → Vo end.
Claims (1)
- The invention relates to a common-base current transmission I/V circuit without large loop negative feedback, which has the protection range as follows: (upper circuit) Ii → R1 → Q1 emitter, collector → R11 lower end (R11 upper terminal VCC) → Q7 emitter, collector → Q8 collector and base short, emitter → R12 → R10 → ground; (lower circuit) Ii → R2 → Q2 emitter, collector → R14 upper end (lower end of R14 is connected to VEE) → Q10 emitter, collector → Q9 collector and base short circuit, emitter → R13 → R10 → ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210097034.1A CN114442720B (en) | 2022-01-20 | 2022-01-20 | Common-base current transmission non-large loop negative feedback I/V circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210097034.1A CN114442720B (en) | 2022-01-20 | 2022-01-20 | Common-base current transmission non-large loop negative feedback I/V circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114442720A true CN114442720A (en) | 2022-05-06 |
| CN114442720B CN114442720B (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210097034.1A Active CN114442720B (en) | 2022-01-20 | 2022-01-20 | Common-base current transmission non-large loop negative feedback I/V circuit |
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| Country | Link |
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| CN (1) | CN114442720B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6420933B1 (en) * | 2000-11-20 | 2002-07-16 | Texas Instruments Incorporated | Low distortion current-to-current converter |
| CN1112760C (en) * | 1999-02-03 | 2003-06-25 | 王仲季 | Biased common-base power amplifier |
| CN2785256Y (en) * | 2005-04-30 | 2006-05-31 | 王丰硕 | Current module high fidelity power amplifier |
| FR2884984A1 (en) * | 2005-04-21 | 2006-10-27 | Vincent Jean Sebastie Tamisier | Single ended class A power amplifier for push-pull type audio-phonic signal amplification system, has power stage to amplify current, equal to current from voltage/current converter, to produce amplified audio-phonic signal as drive current |
| US20070241818A1 (en) * | 2006-04-12 | 2007-10-18 | Texas Instruments Incorporated | Class ab folded cascode stage and method for low noise, low power, low-offset operational amplifier |
| CN102594263A (en) * | 2012-02-13 | 2012-07-18 | 金海辉 | Simple and high-efficiency super class-A power amplifier |
| CN105897193A (en) * | 2015-02-15 | 2016-08-24 | 天工方案公司 | Common-emitter common-base cascode amplifier segmentation for enhanced thermal ruggedness |
| US20190273474A1 (en) * | 2018-03-04 | 2019-09-05 | Zhenwu Wang | Biasing Method Without Using Thermal Compensation Applicable for Both Class-A and Class-AB Audio Power Amplifier |
| CN111082800A (en) * | 2019-12-19 | 2020-04-28 | 王仲季 | I/V converter |
-
2022
- 2022-01-20 CN CN202210097034.1A patent/CN114442720B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112760C (en) * | 1999-02-03 | 2003-06-25 | 王仲季 | Biased common-base power amplifier |
| US6420933B1 (en) * | 2000-11-20 | 2002-07-16 | Texas Instruments Incorporated | Low distortion current-to-current converter |
| FR2884984A1 (en) * | 2005-04-21 | 2006-10-27 | Vincent Jean Sebastie Tamisier | Single ended class A power amplifier for push-pull type audio-phonic signal amplification system, has power stage to amplify current, equal to current from voltage/current converter, to produce amplified audio-phonic signal as drive current |
| CN2785256Y (en) * | 2005-04-30 | 2006-05-31 | 王丰硕 | Current module high fidelity power amplifier |
| US20070241818A1 (en) * | 2006-04-12 | 2007-10-18 | Texas Instruments Incorporated | Class ab folded cascode stage and method for low noise, low power, low-offset operational amplifier |
| CN102594263A (en) * | 2012-02-13 | 2012-07-18 | 金海辉 | Simple and high-efficiency super class-A power amplifier |
| CN105897193A (en) * | 2015-02-15 | 2016-08-24 | 天工方案公司 | Common-emitter common-base cascode amplifier segmentation for enhanced thermal ruggedness |
| US20190273474A1 (en) * | 2018-03-04 | 2019-09-05 | Zhenwu Wang | Biasing Method Without Using Thermal Compensation Applicable for Both Class-A and Class-AB Audio Power Amplifier |
| CN111082800A (en) * | 2019-12-19 | 2020-04-28 | 王仲季 | I/V converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114442720B (en) | 2024-05-17 |
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