CA1094176A - Circuit arrangement for adjusting the amplification of the signals of a plurality of channels to the same value - Google Patents
Circuit arrangement for adjusting the amplification of the signals of a plurality of channels to the same valueInfo
- Publication number
- CA1094176A CA1094176A CA269,916A CA269916A CA1094176A CA 1094176 A CA1094176 A CA 1094176A CA 269916 A CA269916 A CA 269916A CA 1094176 A CA1094176 A CA 1094176A
- Authority
- CA
- Canada
- Prior art keywords
- circuit
- channels
- switches
- voltage
- circuit arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
- Manipulation Of Pulses (AREA)
- Networks Using Active Elements (AREA)
Abstract
H. ?bel 19 CIRCUIT ARRANGEMENT FOR ADJUSTING THE AMPLI-FICATION OF THE SIGNALS OF A PLURALITY OF CHAN-NELS TO THE SAME VALUE
Abstract of the Disclosure To permit uniform, common gain control of a plurality of channels by means of unselected semiconductor devices having greatly varying characteristics, a circuit is proposed which turns these semiconductor devices either fully "on" or "off", and effects the control by varying the on-off ratio. To do this, a sawtooth signal is superimposed on the control signal, and the resulting signal is applied to the semicon-ductor devices through a threshold switch.
Abstract of the Disclosure To permit uniform, common gain control of a plurality of channels by means of unselected semiconductor devices having greatly varying characteristics, a circuit is proposed which turns these semiconductor devices either fully "on" or "off", and effects the control by varying the on-off ratio. To do this, a sawtooth signal is superimposed on the control signal, and the resulting signal is applied to the semicon-ductor devices through a threshold switch.
Description
CIRCUIT ARRANGE~NT FOR ADJUS~ING THE AMPLIFICATION
OF THE SIGNALS OF A PLURALITY OF CHANNELS
TO THE SAM~ VALUE
The present invention relates to a circuit arrangement ~or adjusting the amplification of the signals of a plurality of channels to the same value.
To an~lify signals, use is made o~ active components, such as trans-istors. However, the values of these components vary relatively widely; ~his tYill pre~ent difficulties if a plurality of channels are to be amplified to the s~le value separately from each other.
1~ The object of the invention is to achieve the same amplification in a plurality of channels by means of unselected components. The invention is cllaracterized in that a controlled switch and a band-pass filter are inser-ted in each channel, that, for the common control of the switches, a square-tYave generator is cormected to the switches via an integrator, the first input of an adding circuit, and a threshold circùit, and that a control vol-tage is applied to the second input of the adding circuit, with the range of the control voltage, the output amplitude o the integrator, and the value of the threshold voltage of the threshold circuit matched so that the switches can be operated with an arbitrary duty c~cle.
~O The invention will now be described with reference to the accompany-ing dratYings, in which:
Figure 1 sho~Ys the circuit arrangement according to the inven~ion, ancl Figure 2 shows voltage waveorms to explain the operation o~ the circuit arrangement of Figure 1.
Figure 1 sho~s the circuit arrangement according to the invention For adjusting the channels l...n, n switches Sl...Sn are provided which may .
Y
, :
~,:', ;
``` .~g5~4~76 be implemented using semiconductors in the "off" or "on" state. The switch-es Sl...Sn are followed by band-pass filters BPl...~Pn which eliminate the un~anted frequencies caused by the s~itching operation.
The s~itches Sl...Sn are controlled by means of a threshold circuit SCH, an adding c.i~cuit ADD, a square-wave ge~erator OSZ, and an integrator IG.
The function of these devices is, in principle, to vary the duty cycles of the switches Sl...Sn as a function of a control voltage UR, and thus to con-trol the amplitude of the output signal having the frequency of the input sig-nal.
The operation of the arrangement ~ill no~ be explained with the aid of Figure 2.
Figure 2 shows the output-voltage waveforms of the devices of Figure 1. The waveforms represent (from top to bottom) the output voltage U~OSZ) of the square-wave generator OSZ;
the output voltage U~IG) of the integrator IG;
the control voltage UR;
the output voltage of ~he adding circui~ ADD=U~OSZ)~UR;
the output voltage U(SCEI) of the threshold circuit SCH;
a sinusoidal input voltage UE~n) of the channel n, a~d the output voltage UA(n) of the chc^~nel n, amplified in accordance with the invention.
In the exam~le, a linearly decreasing voltage has been chosen as the control voltage UR.
The threshold circuit SCH is set to a threshold value SW adapted to the possible control voltages UR.
The decreasing control voltage UR causes the superposed voltage U
(OSZ)~UR to exceed the threshold S~ for increasingly shorter periods of time, .
.
- ;: . .
~.
:
3~7~
thus causing an output voltage U~SCH).
Let T be a cycle of the voltage U~IG), tl the period during which an output voltage U(SC~) is present, and t2=T-tl the period during which no output voltage U~SC}I) is present. It can be seen from Figure 2 that the ~ecreasing control voltage UR causes a decrease in the pulse duty factor tl/
t2 and, consequently, a reduction of the output signal having the frequency of the input voltage UE~n), because the switches Sl...S2 are opened and closed by the voltage U~SC~I). It is thus possible to control the amplitude of the output signal having the frequency of the input signal by varying the control voltage UR; the effective output voltage U~n) is U~n)=UE t2/T
Since the factor t2/T is the same for all channels, the same con-trol is obtained for all channels, which is only dependent on the ~common) cqntrol voltage UR.
One possibility of generating a suitable control voltage UR is to form the sum voltage of all channels behind the band-pass filters BPl...BPn, rectify it, and use it to drive the adding circuit.
. .. .. .
.~
, ~
OF THE SIGNALS OF A PLURALITY OF CHANNELS
TO THE SAM~ VALUE
The present invention relates to a circuit arrangement ~or adjusting the amplification of the signals of a plurality of channels to the same value.
To an~lify signals, use is made o~ active components, such as trans-istors. However, the values of these components vary relatively widely; ~his tYill pre~ent difficulties if a plurality of channels are to be amplified to the s~le value separately from each other.
1~ The object of the invention is to achieve the same amplification in a plurality of channels by means of unselected components. The invention is cllaracterized in that a controlled switch and a band-pass filter are inser-ted in each channel, that, for the common control of the switches, a square-tYave generator is cormected to the switches via an integrator, the first input of an adding circuit, and a threshold circùit, and that a control vol-tage is applied to the second input of the adding circuit, with the range of the control voltage, the output amplitude o the integrator, and the value of the threshold voltage of the threshold circuit matched so that the switches can be operated with an arbitrary duty c~cle.
~O The invention will now be described with reference to the accompany-ing dratYings, in which:
Figure 1 sho~Ys the circuit arrangement according to the inven~ion, ancl Figure 2 shows voltage waveorms to explain the operation o~ the circuit arrangement of Figure 1.
Figure 1 sho~s the circuit arrangement according to the invention For adjusting the channels l...n, n switches Sl...Sn are provided which may .
Y
, :
~,:', ;
``` .~g5~4~76 be implemented using semiconductors in the "off" or "on" state. The switch-es Sl...Sn are followed by band-pass filters BPl...~Pn which eliminate the un~anted frequencies caused by the s~itching operation.
The s~itches Sl...Sn are controlled by means of a threshold circuit SCH, an adding c.i~cuit ADD, a square-wave ge~erator OSZ, and an integrator IG.
The function of these devices is, in principle, to vary the duty cycles of the switches Sl...Sn as a function of a control voltage UR, and thus to con-trol the amplitude of the output signal having the frequency of the input sig-nal.
The operation of the arrangement ~ill no~ be explained with the aid of Figure 2.
Figure 2 shows the output-voltage waveforms of the devices of Figure 1. The waveforms represent (from top to bottom) the output voltage U~OSZ) of the square-wave generator OSZ;
the output voltage U~IG) of the integrator IG;
the control voltage UR;
the output voltage of ~he adding circui~ ADD=U~OSZ)~UR;
the output voltage U(SCEI) of the threshold circuit SCH;
a sinusoidal input voltage UE~n) of the channel n, a~d the output voltage UA(n) of the chc^~nel n, amplified in accordance with the invention.
In the exam~le, a linearly decreasing voltage has been chosen as the control voltage UR.
The threshold circuit SCH is set to a threshold value SW adapted to the possible control voltages UR.
The decreasing control voltage UR causes the superposed voltage U
(OSZ)~UR to exceed the threshold S~ for increasingly shorter periods of time, .
.
- ;: . .
~.
:
3~7~
thus causing an output voltage U~SCH).
Let T be a cycle of the voltage U~IG), tl the period during which an output voltage U(SC~) is present, and t2=T-tl the period during which no output voltage U~SC}I) is present. It can be seen from Figure 2 that the ~ecreasing control voltage UR causes a decrease in the pulse duty factor tl/
t2 and, consequently, a reduction of the output signal having the frequency of the input voltage UE~n), because the switches Sl...S2 are opened and closed by the voltage U~SC~I). It is thus possible to control the amplitude of the output signal having the frequency of the input signal by varying the control voltage UR; the effective output voltage U~n) is U~n)=UE t2/T
Since the factor t2/T is the same for all channels, the same con-trol is obtained for all channels, which is only dependent on the ~common) cqntrol voltage UR.
One possibility of generating a suitable control voltage UR is to form the sum voltage of all channels behind the band-pass filters BPl...BPn, rectify it, and use it to drive the adding circuit.
. .. .. .
.~
, ~
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A circuit arrangement for adjusting the amplification of the signals of a plurality of channels to the same value, characterized in that a controlled switch (Sl...Sn) and a band-pass filter (BPl...BPn) are inser-ted in each channel (l...n), that, for the common control of the switches (Sl...Sn), a square-wave generator (OSZ) is connected to the switches (Sl...
Sn) via an integrator (IG), the first input of an adding circuit (ADD), and a threshold circuit (SCH), and that a control voltage (UR) is applied to the second input of the adding circuit (ADD), with the range of the control voltage (UR), the output amplitude of the integrator (IG), and the value of the threshold voltage (SW) of the threshold circuit (SCH) matched so that the switches (Sl...Sn) can be operated with an arbitrary duty cycle.
Sn) via an integrator (IG), the first input of an adding circuit (ADD), and a threshold circuit (SCH), and that a control voltage (UR) is applied to the second input of the adding circuit (ADD), with the range of the control voltage (UR), the output amplitude of the integrator (IG), and the value of the threshold voltage (SW) of the threshold circuit (SCH) matched so that the switches (Sl...Sn) can be operated with an arbitrary duty cycle.
2. A circuit arrangement according to claim 1, characterized in that the switches (Sl...Sn) are implemented using semiconductor devices in the "off" or "on" state whose control electrodes are supplied with the output pulses of the threshold circuit (SCH).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2601863.3 | 1976-01-20 | ||
| DE19762601863 DE2601863B2 (en) | 1976-01-20 | 1976-01-20 | Circuit arrangement for the same control behind amplification must be deleted |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094176A true CA1094176A (en) | 1981-01-20 |
Family
ID=5967777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA269,916A Expired CA1094176A (en) | 1976-01-20 | 1977-01-18 | Circuit arrangement for adjusting the amplification of the signals of a plurality of channels to the same value |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1094176A (en) |
| DE (1) | DE2601863B2 (en) |
| ES (1) | ES455129A1 (en) |
| FR (1) | FR2339286A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2201559A (en) * | 1987-01-23 | 1988-09-01 | Gen Electric Plc | Electrical signal mixer circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3080524A (en) * | 1961-01-10 | 1963-03-05 | Bell Telephone Labor Inc | Linear automatic volume control system |
| US3492563A (en) * | 1967-05-08 | 1970-01-27 | Bell Telephone Labor Inc | Linear wide band level control means and method |
| JPS5219441B1 (en) * | 1971-07-27 | 1977-05-27 | ||
| US3862380A (en) * | 1973-04-19 | 1975-01-21 | Hekimian Laboratories Inc | Intermodulation distortion analyzer |
-
1976
- 1976-01-20 DE DE19762601863 patent/DE2601863B2/en not_active Withdrawn
-
1977
- 1977-01-18 CA CA269,916A patent/CA1094176A/en not_active Expired
- 1977-01-18 ES ES455129A patent/ES455129A1/en not_active Expired
- 1977-01-20 FR FR7701554A patent/FR2339286A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ES455129A1 (en) | 1977-12-16 |
| DE2601863A1 (en) | 1977-07-21 |
| DE2601863B2 (en) | 1981-07-09 |
| FR2339286B1 (en) | 1983-03-11 |
| FR2339286A1 (en) | 1977-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |