GB1157759A - Field Effect Transistor Amplifier Circuits - Google Patents
Field Effect Transistor Amplifier CircuitsInfo
- Publication number
- GB1157759A GB1157759A GB5910867A GB5910867A GB1157759A GB 1157759 A GB1157759 A GB 1157759A GB 5910867 A GB5910867 A GB 5910867A GB 5910867 A GB5910867 A GB 5910867A GB 1157759 A GB1157759 A GB 1157759A
- Authority
- GB
- United Kingdom
- Prior art keywords
- field effect
- gate
- transistor
- input
- effect transistor
- 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
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/342—Negative-feedback-circuit arrangements with or without positive feedback in field-effect transistor amplifiers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/18—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/34—Dc amplifiers in which all stages are dc-coupled
- H03F3/343—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only
- H03F3/345—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only with field-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/34—Dc amplifiers in which all stages are dc-coupled
- H03F3/343—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only
- H03F3/347—Dc amplifiers in which all stages are dc-coupled with semiconductor devices only in integrated circuits
Abstract
1,157,759. Field effect transistor amplifiers; automatic volume control. RADIO CORPORATION OF AMERICA. 29 Dec., 1967 [19 Jan., 1967], No. 59108/67. Headings H3T and H4R. In an amplifier having a plurality of stages 10 1 , 10 2 ... 10 n connected in cascade, each stage consists of a common source connected insulated gate transistor 21, 14 which has a drain load impedance 20, 16 and the output 15 1 , 15 2 from each stage is connected to the gate of the succeeding transistor, the load impedance of at least one of the transistors is formed by the source-drain path of a further insulated gate field effect transistor 20 connected as a source follower and having the gate disposed to receive input signals and a feedback circuit 40 is connected between the output 15 n of the last stage 10 n and the gate 21g of the transistor 21 in the first stage 10 1 so as to provide a degenerativefeedback voltage. The feedback circuit may include an insulated gate field effect transistor 40 or this may be replaced by a resistor. Changes in the D.C. level at the output due to thermal effects, threshold voltage changes, supply voltage drift and component aging is fed back to the input 21g to provide degenerative feedback to compensate for these changes. The variations due to the A.C. signal, which may be at radio frequency, are filtered out by a capacitor 41. The load impedances of the 10 2 ... 10 n stages are shown as insulated gate field effect transistors 16 connected as diodes or alternatively these can each be replaced by a resistor. Several inputs can be connected to separate gate electrodes 20g, 16g 2 -(the earth connection to gates 16g 2 being removed), so that the output represents the combination of these inputs. The input signal can be disconnected from the first stage 10 1 in which case the gate 20g is connected to earth 12. Automatic gain control may be included in the circuit by connecting the source to drain path of an additional insulated gate field effect transistor between the gate and drain electrodes of one of the transistors 14. The AGC voltage signal is then supplied to the gate of the additional transistor. The input 17 1 to the amplifier may be fed from a source (70, Fig. 2, not shown) of slowly varying signal or D.C. signal via the conduction path of an enhancement type insulated gate field effect transistor (80) which conducts alternately with a further similar transistor (90). The input enhancement type transistors (80, 90) conduct alternately when their inputs increase above a certain threshold level and by connecting a detector circuit to the output of the amplifier, operating synchronously with the input transistors (80, 90) the output is converted back to D.C. The circuits may be constructed of individual components or may be formed as an integrated circuit. P or N type transistors may be used of the enhancement or depletion types. The input 19 may be a parallel tuned circuit of a transducer such as a microphone.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US61043967A | 1967-01-19 | 1967-01-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1157759A true GB1157759A (en) | 1969-07-09 |
Family
ID=24445016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5910867A Expired GB1157759A (en) | 1967-01-19 | 1967-12-29 | Field Effect Transistor Amplifier Circuits |
Country Status (8)
Country | Link |
---|---|
AT (1) | AT293479B (en) |
BE (1) | BE709584A (en) |
DE (1) | DE1562081C3 (en) |
ES (1) | ES349407A1 (en) |
FR (1) | FR1551547A (en) |
GB (1) | GB1157759A (en) |
NL (1) | NL146667B (en) |
SE (1) | SE348336B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2117203A (en) * | 1982-03-05 | 1983-10-05 | Pioneer Electronic Corp | Level shifting circuit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111682853B (en) * | 2020-06-15 | 2023-05-16 | 电子科技大学 | Alternating capacitor network of capacitive coupling chopper amplifier |
-
1967
- 1967-12-29 GB GB5910867A patent/GB1157759A/en not_active Expired
-
1968
- 1968-01-17 ES ES349407A patent/ES349407A1/en not_active Expired
- 1968-01-17 FR FR1551547D patent/FR1551547A/fr not_active Expired
- 1968-01-18 NL NL6800788A patent/NL146667B/en unknown
- 1968-01-18 BE BE709584D patent/BE709584A/xx unknown
- 1968-01-18 SE SE65768A patent/SE348336B/xx unknown
- 1968-01-19 AT AT60268A patent/AT293479B/en active
- 1968-01-19 DE DE1968R0047832 patent/DE1562081C3/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2117203A (en) * | 1982-03-05 | 1983-10-05 | Pioneer Electronic Corp | Level shifting circuit |
Also Published As
Publication number | Publication date |
---|---|
NL146667B (en) | 1975-07-15 |
DE1562081C3 (en) | 1979-09-27 |
AT293479B (en) | 1971-10-11 |
NL6800788A (en) | 1968-07-22 |
BE709584A (en) | 1968-05-30 |
DE1562081A1 (en) | 1970-02-19 |
SE348336B (en) | 1972-08-28 |
DE1562081B2 (en) | 1970-11-19 |
ES349407A1 (en) | 1969-04-01 |
FR1551547A (en) | 1968-12-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |