US2174234A - Broad band amplifier - Google Patents
Broad band amplifier Download PDFInfo
- Publication number
- US2174234A US2174234A US141916A US14191637A US2174234A US 2174234 A US2174234 A US 2174234A US 141916 A US141916 A US 141916A US 14191637 A US14191637 A US 14191637A US 2174234 A US2174234 A US 2174234A
- Authority
- US
- United States
- Prior art keywords
- stage
- tube
- amplifier
- band
- vacuum
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/42—Modifications of amplifiers to extend the bandwidth
- H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
- H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only
Definitions
- a multistage broad-band amplifier comprises two or more impedance-coupled vacuum tubes, the impedance means included in the output circuit of each stage being coupled to the cathode of the vacuum tube or tubes of the succeeding stage so that, for direct current, the vacuum tubes are effectively in series.
- the input voltage to each stage after the first is reversed in phase with respect to conventional multistage amplifiers so that there is a single resultant phase reversal, regardless of the number of stages.
- a television combining amplifier for combining and amplifying a broad band of video frequencies, line-frequency impulses, and frame-frequency impulses prior to modulation of the carrier wave.
- the single figure of the drawing is a circuit diagram of an embodiment of the invention as applied to a combining amplifier suitable for use in a television transmitter.
- a multistage broad-band amplifier for combining and amplifying signals received from a videofrequency input circuit H, which may be energized from a cathode-ray signal-generating tube either with or without intermediate amplification, a line-frequency generator Ii, and a frame-frequency generator l2, and for delivering the combined output to a load device l3, which may be a modulator.
- the video-frequency input circuit III is coupled to the input circuit of a vacuum tube M, while the line-frequency generators i l and I2 are coupled to the input circuits of vacuum tubes l5 and [6, respectively, the tubes I, I5, and I6 comprising the first stage of the amplifier.
- the anodes of the tubes ll, l5, and it are connected in parallel, while their cathodes are grounded through conventional biasing circuits I9, 20, and 2
- the sum of the anode-cathode capacitances of tubes ll, l5, and I6 is represented by the dotted-line condenser 26.
- Power is supplied to the tubes l4, l5, and it from a source indicated as +B, through load resistors 22 and 23 in series, resistor 22 being by-passed by condenser 21.
- the second amplifier stage comprises vacuum tube IT having its grid grounded for alternating potentials through condenser 29 and its cathode connected to the common anode terminal of the tubes l4, l5, and it of the first amplifier stage.
- the output circuit of the first amplifier stage is untunable and substantially all of its impedance is included in a common portion of the anode-cathode and grid-cathode circuits of the second amplifier stage.
- the output circuit of tube I1 is coupled to the input terminals of load device l3. Power is supplied to the tube l'l' from the source indicated at +3, through a load resistor 24.
- the control grid of tube H is biased by means of a voltage divider comprise ing resistors 25 and 28 and connected across the source +B, as shown in the drawing.
- the voltage appearing across resistor 23 in the common output circuit of tubes ll, l5, and It contains three components, video-frequency voltages and line-frequency and framefrequency impulses, but without substantial cross modulation or distortion.
- the periodic voltage appearing across resistor 23 is impressed between the cathode of tube ii and ground through condenser 21, while the grid of tube [1 is grounded for periodic voltage through condenser 29.
- the phase of the input voltage to the tube I1 is reversed with respect to that in a conventional impedance-coupled amplifier and the output voltage supplied to the load I3 is substantially in phase with that developed in the common output circuit of tubes l4, l5, and 16.
- the combined interelectrode capacitance represented by the condenser 26, constitutes a shunt admittance which rises with frequency so that, at the higher frequencies of the band, the gain of the first stage is materially impaired, resulting in a nonuniform amplification throughout the broad band of frequencies to be passed by the system.
- resistor 23 is common to the gridcathode circuit and the anode-cathode circuit of tube l1 and, accordingly, produces degeneration in the second amplifier stage.
- the combined interelectrode capacitance 26 of the first stage effectively by-passes the resistor 23 to an extent which increases with frequency so that the second amplifier stage is degenerative primarily at low frequencies.
- the nonuniform gain characteristic of the first amplifier stage which discriminates in favor of the lower frequencies
- the nonuniform gain characteristic of the second amplifier stage which discriminates in favor of the higher frequencies. It has been found that, by properly selecting the circuit constants, the two gain characteristics may be made substantially complementary so that the amplifier transmits a broad band of frequencies with a relatively uniform over-all gain.
- a multistage broad-band vacuum-tube amplifying system comprising a first vacuum-tube amplifying stage having an untunable output circuit with appreciable shunt capacitance, whereby the higher frequencies of the band are discriminated against, a second vacuum-tube amplifying stage having anode-cathode and gridcathode circuits including a common portion,
- a multistage broad-band vacuum-tube amplifying system comprising a first vacuum-tube amplifying stage 'having an untunable output circuit with appreciable shunt capacitance, a second amplifying stage in cascade with said first stage and comprising anode-cathode and gridcathode circuits including a common portion, and an appreciable impedance variable with frequency over said band in the output circuit of said first stage and coupled in the common cathode circuit of said second stage, whereby said amplifier stages have complementary response characteristics.
- a first stage comprising a plurality of vacuum tubes having output electrodes in parallel in an untunable output circuit, whereby the anode-cathode capacitances of said tubes are also in parallel and constitute an appreciable shunt capacitance and the higher frequencies of the band are discriminated against
- a second vacuum-tube amplifying stage having anodecathode and grid-cathode circuits including a common portion, and shunt impedance means in the output circuit of said first stage and coupled to the common cathode circuit of said second stage, said shunt capacitance causing said second stage to be degenerative primarily at the lower frequencies of the band to discriminate thereagainst.
- a multistage broad-band vacuum-tube amplifying system comprising a first vacuum tube amplifying stage having an output circuit with appreciable shunt capacitance, whereby the higher frequencies of the band are discriminated against, a second vacuum-tube amplifying stage having anode-cathode and grid-cathode circuits including a common portion, said stages being connected effectively in series for direct current and in cascade for alternating currents, and impedance coupling means including substantially all of the impedance of said output circuit of said first stage including said capacitance coupled in the common cathode circuit of said second stage to cause said second stage to be degenerative primarily at the lower frequencies of the band to discriminate thereagainst.
- a multistage broad-band vacuum-tube amplifying system comprising a first vacuum-tube amplifying stage having an inherent shunt capacitance in the output circuit thereof, whereby the higher frequencies of the band are discriminated against, and a second vacuum-tube amplifying stage having anode-cathode and gridcathode circuits including a common resistor, said stages being connected effectively in series for direct current and in cascade for alternating currents, said capacitance being effectively in shunt with said resistor, said resistor and said capacitance comprising substantially all of the impedance of said output circuit, whereby said second stage is degenerative primarily at the lower frequencies of the band and discriminates thereagainst.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE428005D BE428005A (fi) | 1937-05-11 | ||
NL58460D NL58460C (fi) | 1937-05-11 | ||
US141916A US2174234A (en) | 1937-05-11 | 1937-05-11 | Broad band amplifier |
GB12078/38A GB490656A (en) | 1937-05-11 | 1938-04-22 | Improvements in broad band amplifiers |
CH206321D CH206321A (de) | 1937-05-11 | 1938-05-02 | Verstärkerschaltung. |
DEH155706D DE763749C (de) | 1937-05-11 | 1938-05-04 | Breitbandverstaerker |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US141916A US2174234A (en) | 1937-05-11 | 1937-05-11 | Broad band amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
US2174234A true US2174234A (en) | 1939-09-26 |
Family
ID=22497798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US141916A Expired - Lifetime US2174234A (en) | 1937-05-11 | 1937-05-11 | Broad band amplifier |
Country Status (6)
Country | Link |
---|---|
US (1) | US2174234A (fi) |
BE (1) | BE428005A (fi) |
CH (1) | CH206321A (fi) |
DE (1) | DE763749C (fi) |
GB (1) | GB490656A (fi) |
NL (1) | NL58460C (fi) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2552884A (en) * | 1947-01-21 | 1951-05-15 | Western Union Telegraph Co | Oscilloscope system |
US2604552A (en) * | 1946-04-30 | 1952-07-22 | Emi Ltd | Multigrid amplifier with constant ratio of cathode current to anode current |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE878670C (de) * | 1941-04-03 | 1953-06-05 | Klangfilm Gmbh | Schaltungsanordnung zur Ankopplung einer elektrostatischen Sprechstromquelle |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1896534A (en) * | 1927-05-13 | 1933-02-07 | Gen Electric | Electrical system |
US2057998A (en) * | 1927-11-18 | 1936-10-20 | Telefunken Gmbh | Vacuum tube circuits |
GB337830A (en) * | 1929-06-08 | 1930-11-10 | Radio Frequency Lab Inc | Electrical amplifier circuits |
GB349483A (en) * | 1930-01-23 | 1931-05-26 | Patrick Henry | Improvements in the design of radio and sound reproducing apparatus and the like |
DE584782C (de) * | 1931-01-06 | 1933-09-23 | Telefunken Gmbh | Verstaerkerschaltung |
GB425553A (en) * | 1933-09-18 | 1935-03-18 | Emi Ltd | Improvements in and relating to thermionic valve amplifiers |
GB465118A (en) * | 1935-10-30 | 1937-04-30 | British Thomson Houston Co Ltd | Improvements in and relating to amplifying circuits suitable in connection with television |
-
0
- BE BE428005D patent/BE428005A/xx unknown
- NL NL58460D patent/NL58460C/xx active
-
1937
- 1937-05-11 US US141916A patent/US2174234A/en not_active Expired - Lifetime
-
1938
- 1938-04-22 GB GB12078/38A patent/GB490656A/en not_active Expired
- 1938-05-02 CH CH206321D patent/CH206321A/de unknown
- 1938-05-04 DE DEH155706D patent/DE763749C/de not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2604552A (en) * | 1946-04-30 | 1952-07-22 | Emi Ltd | Multigrid amplifier with constant ratio of cathode current to anode current |
US2552884A (en) * | 1947-01-21 | 1951-05-15 | Western Union Telegraph Co | Oscilloscope system |
Also Published As
Publication number | Publication date |
---|---|
GB490656A (en) | 1938-08-18 |
DE763749C (de) | 1953-05-04 |
BE428005A (fi) | |
NL58460C (fi) | |
CH206321A (de) | 1939-07-31 |
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