Automatic gain control regulator

专利摘要:

公开号:SU1205792A3
申请号:SU823449162
申请日:1982-06-07
公开日:1986-01-15
发明作者:Шредер Эрнст
申请人:Лицентиа Патент Фервальтунгс-Гмбх (Фирма)；
IPC主号:

专利说明:

one
The invention relates to radio engineering, and gfy circuit design with automatic gain control may be used.
The purpose of the invention is to reduce nonlinear distortion.
Figure 1 shows a circuit diagram of a regulator for an automatic gain control device when an additional resistor is switched on in the zmittarny circuit of the transistor of the first arm of the differential amplifier; in fig. 2 - the same, with the inclusion of an additional resistor in the emitter circuit of the transistor of the second shoulder of the differential amplifier; in fig. 3 shows diagrams explaining the operation of the controller for the device; automatic gain control; in fig. 4 is a circuit diagram of one of the variants of the controller for the automatic gain control device, which is based on the principles of operation of the regulators of FIGS. 1 and 2.
The controller for the automatic gain control device (Figures 1 and 2) contains a switch 1, an additional capacitor 2, a current source 3, an additional switch 4, a filter capacitor 5, the first and second resistors 6 and 7, a controlled transistor 8, a differential amplifier 9 , a current generator 10, an additional resistor 11, a voltage source 12 and diodes 13.
The regulator of FIG. 4 contains a switch 1, an additional capacitor 2, a voltage source 3, an additional switch 4, a filter capacitor 5, the first and second resistors 6 and 7, the controlled transistor 8, the first and second transistors 9 and 10, and the third resistor eleven.
The controller for the automatic gain control device (Fig. 1) works as follows.
In the absence of an input signal or if its value is less than a certain threshold value determined by the response voltage of the additional switch 4, the filter capacitor 5 is charged to a certain value and, therefore, the control voltage at the output of the regulator is constant.
If the amplitude of the input signal at the moment of time to (Fig. Over) exceeds 05792
the switch voltage of the switch 1, then the additional capacitor 2, is very quickly discharged to some residual voltage determined by the value of the voltage
open key 1 (fig.Zb). In this case, the transistor of the first arm of the differential amplifier 9 is closed, its collector current decreases almost to zero (Fig. 3b), and therefore the charge current of the filter capacitor 5 is determined by the current through the first resistor 6, i.e. The time constant, which depends on the capacitance of the filter capacitor 5 and the resistance of the first resistor 6, is large.
If the amplitude of the input signal exceeds the response voltage of the additional key 4, then the filter
2Q capacitor 5 is discharged and the control voltage at the output of the regulator decreases (Fig. H).
If at time t (the amplitude of the input signal decreases
25 to a value less than the response threshold of keys 1-4, the latter are closed.
At the same time, the voltage on the additional capacitor 2 increases linearly due to the action of the charging current of the current source 3 from the magnitude of the residual voltage to the value limited by the diodes 13 for a period of time t, - 3. (Fig. 3B). the controller delays when the current through the transistor of the first arm of the differential amplifier 9 does not flow and the charge of the filter capacitor 5 is still with a long time constant.
At time tj, the voltage on the additional capacitor 2 reaches a value equal to 5 and the voltage of the source 12 of the reference voltage: The first transistor of the differential amplifier 9 opens and its collector current increases in proportion to
50 to the value of the voltage on the additional capacitor 2 (Fig. 3b).
An increase in the collector current occurs until the transistor of the second arm of the differential amplifier 9 is closed. This increasing current leads to an increase in the current through the control transistor 8 and, consequently, through
thirty
35
filter capacitor 5, as a result of which the control voltage at the regulator's output (Fig. G) rises to the maximum value
The operation of the controller for the automatic gain control device of FIG. 2 is similar to the operation of the controller of FIG. 1.
The regulator in figure 4 works as follows.
In the absence of an input signal, the filter capacitor 5 is charged to a certain value, hence the control voltage at the output of the regulator is constant.
When the amplitude of the input signal exceeds a certain level, the key 1 is turned on, the first transistor 9 is opened and the additional capacitor 2 is connected to the source 3 of the voltage.
At the moment when the amplitude of the input signal reaches its maximum value, an additional switch 4 is activated, the filter capacitor 5
2057924
The control voltage at the output of the regulator decreases.
When key 1 is turned on, the second 5 transistor 10 closes and the current through the third resistor 11 does not flow while the controlled transistor 8
, Closed and charged current of the filter switch 5 through this transistor
10 and the resistor 7 does not leak.
When the amplitude of the input signal decreases below the threshold value, the key 1 after some time delay is turned on, the first
15, the transistor 9, from this moment on, the discharge of the additional capacitor 2 through the third resistor 11 begins. A decrease in the voltage on the additional capacitor 2 leads to a steady opening of the second transistor 10 and an increase in the current through the third resistor 11 and the charging current through the filter capacitor 5, which leads to an increase in control 25: about 1 voltage
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Compiled by L.Zaks Editor M.Dylyn Tehred t.Dubinchak Proofreader
Order 8552/63 Circulation 871 Subscription All-Russia Institute of Scientific and Technical Information of the USSR State Committee
for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
Filial ShSh Patent, g, Uzhgorod, st. Project, 4

权利要求:
Claims (1)
[1]
A REGULATOR FOR AUTOMATIC ADJUSTMENT OF AMPLIFICATION DEVICE, comprising a filter capacitor, in the charge circuit of which are connected in parallel a first resistor and a circuit of a second resistor and a controlled transistor connected in series, a differential amplifier on transistors with a current generator in a common emitter circuit, the output of the first arm of which is connected with the base of the controlled transistor, and the input of the first arm with an additional capacitor, in the charge circuit of which a current source is included, the input of the second arm It is connected to a reference voltage source, characterized in that, in order to reduce non-linear distortions, a key is connected in parallel with the additional capacitor, the control input of which is the regulator input, an additional key is connected in parallel with the filter capacitor, the control input of which is connected to the regulator input, and the emitter one of the transistors of the differential amplifier is connected to the current generator through an additional resistor.
SU „„ 1205792>

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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US3371269A|1964-05-18|1968-02-27|Bendix Corp|Voltage regulator including means for eliminating ripple output voltages|

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NO142768C|1974-01-26|1980-10-08|Licentia Gmbh|CLUTCH FOR AUTOMATIC DYNAMICS COMPRESSION OR EXPANSION|

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DE2830784C3|1978-07-13|1981-10-01|Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt|Circuit arrangement for generating a DC control voltage dependent on an AC voltage|

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DE2850736C2|1978-11-23|1980-05-14|Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt|Circuit arrangement for generating a DC control voltage dependent on an AC voltage|DE3305938A1|1983-02-21|1984-08-23|Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover|Circuit arrangement for generating a DC control voltage dependent on an AC voltage|

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JPH0368209A|1989-08-07|1991-03-25|Fujitsu Ltd|Signal converter|

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US5065053A|1990-02-26|1991-11-12|Digital Equipment Corporation Of Canada, Ltd.|Exponential function circuitry|

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JP3319406B2|1998-09-18|2002-09-03|日本電気株式会社|Comparison amplification detection circuit|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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DE19813124289|DE3124289A1|1981-06-19|1981-06-19|CIRCUIT ARRANGEMENT FOR GENERATING A DC CONTROL VOLTAGE DEPENDING ON AN AC VOLTAGE|

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