GB380377A - Improvements in or relating to amplifier circuit arrangements - Google Patents
Improvements in or relating to amplifier circuit arrangementsInfo
- Publication number
- GB380377A GB380377A GB8401/32A GB840132A GB380377A GB 380377 A GB380377 A GB 380377A GB 8401/32 A GB8401/32 A GB 8401/32A GB 840132 A GB840132 A GB 840132A GB 380377 A GB380377 A GB 380377A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- circuit
- tuned
- plate
- impedance
- 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
- 230000000694 effects Effects 0.000 abstract 2
- 230000007423 decrease Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
380,377. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London. -(Assignees of Farnham, P. O. ; 104, Elcock Avenue, Boonton, New Jersey, U.S.A.) March 21, 1932, No. 8401. Convention date, March 19, 1931. [Class 40 (v).] In a tuned high-frequency amplifier employing one or more dynatron or negative-resistance valve stages, means are provided (1) for maintaining stability and substantial uniformity of gain over the tuning range, and (2) for maintaining stability when volume is controlled by regulating the bias on an input grid. Fig. 4 shows a two-stage amplifier employing screengrid valves V1, V2 as dynatrons, and with a tuned input circuit L, C and tuned intervalve and output circuits L2, C2. When the tuned circuits are adjusted over the tuning range, their impedance as viewed from the platecathode terminals of the valve is altered, and the gain (which depends on the ratio of the external impedance to the internal impedance) is also altered. To overcome this, the tuned circuit L2, C2 is connected to the plate through a small condenser Cm, and is shunted by a series combination of a coil L1, resistance R1 and large capacity C1. This has the effect of maintaining the external impedance substantially constant during tuning, and so effects the object (1). Self-oscillation is also prevented, as the external impedance cannot become greater than the internal impedance. The shunt circuit L1, R1, C1 may be replaced by a parallel combination of inductance and capacity in series with a resistance, Fig. 8 (not shown). In Fig. 7, the external impedance is kept constant, by linking the tuning condenser C2 to a variable resistance R in the tuned plate circuit ; whilst in another modification; Fig. 10 (not shown), the tuning condenser is linked to a variable self-biasing resistance in the control grid circuit. Referring to the second object of the invention, this is attained in the circuit of Fig. 4 by interposing resistances R in the plate-supply circuits. As volume is increased by reducing control grid bias Ec, the resistance R (owing to the negative characteristic of the plate circuit) adds to the plate voltage and so maintains stability. Where two stages are employed, a single resistance R may be employed, with a variable tap 10 connected to the supply source. Instead of employing the resistance R, the grid-bias control Ec may be linked mechanically to the plate-voltage control EB in such a way that EB increases as Ec decreases, Fig. 11 (not shown). Stability under volume control may also be effected by interposing a resistance in the high-voltage screengrid circuit, Fig. 9 (not shown). The Specification includes sets of characteristic curves of the valves, and other curves showing (a) substantial uniformity of gain over the tuning range, (b) that the circuit is more selective than the normal tuned amplifier, and (c) that selectivity increases at high gain ratios.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US523859A US2072945A (en) | 1931-03-19 | 1931-03-19 | Amplifier circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB380377A true GB380377A (en) | 1932-09-15 |
Family
ID=24086725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8401/32A Expired GB380377A (en) | 1931-03-19 | 1932-03-21 | Improvements in or relating to amplifier circuit arrangements |
Country Status (2)
Country | Link |
---|---|
US (1) | US2072945A (en) |
GB (1) | GB380377A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2423106A (en) * | 1941-09-12 | 1947-07-01 | Int Standard Electric Corp | Electron discharge tube amplifier |
US2623130A (en) * | 1944-12-15 | 1952-12-23 | Automatic Elect Lab | Thermionic power amplifier for delivering high power to low impedance loads |
US2489266A (en) * | 1945-09-14 | 1949-11-29 | Farnsworth Res Corp | Cathode-coupled amplifier |
-
1931
- 1931-03-19 US US523859A patent/US2072945A/en not_active Expired - Lifetime
-
1932
- 1932-03-21 GB GB8401/32A patent/GB380377A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2072945A (en) | 1937-03-09 |
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