EP0124983A2
Expired / Lapsed
EP
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Feedback amplifier
Assignee: Fujitsu Ltd
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Filing: 1984-03-20
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Granted: —
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Expires: 2004-03-20
Abstract
Abstract A feedback amplifier circuit includes an inversion circuit (11, 12), a level shift circuit (1), and a feedback resistive element (R,). The inversion circuit includes an input active element (12) and a load element (11) connected in cascade with respect to an electrical source. The level shift circuit (1) includes a field effect transistor (13) having a gate connected to the output of the inversion circuit (11,12), a diode or diodes (D 1 ... Dn) and a constant current active load (14) connected in cascade with respect to the electrical source. The feedback resistive element (R,) is connected between the output of the level shift circuit and the input of the inversion circuit.
Inventors
- 👤 Masafumi Shigaki
- 👤 Yoshimasa Daido
- 👤 Yukio Takeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:15
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/483; H03F1/34; H03F1/342; H03F3/00; H03F3/189; H03F3/19; H03F3/193; H03F3/1935; H03F2200/00; H03F2200/372
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
A feedback amplifier comprising: an inversion circuit in which an input active element (11) and a load element (12) are connected in cascade with respect to an electrical source; and a feedback resistive element (R 1 ) characterised in that a level shift circuit (1) is provided comprising a field effect transistor (13) having a gate connected to the output of the inversion circuit, a diode or diodes (D 1 ... D n ), and a constant current active load (14) connected in cascade with respect to the electrical source, and in that the feedback resistive element (R 1 ) is connected between the output of the level shift circuit (1) and the input (IN) of the inversion circuit.
Claim 2
Dependent Claim
119 words
A feedback amplifier comprising: an inversion circuit in which an input active element (11) and a load element (12) are connected in cascade with respect to an electrical source; and a feedback resistive element (R 1 ) characterised in that a level shift circuit (1) is provided comprising a field effect transistor (13) having a gate connected to the output of the inversion circuit, a diode or diodes (D 1 ... D n ), and a constant current active load (14) connected in cascade with respect to the electrical source, and in that the feedback resistive element (R 1 ) is connected between the output of the level shift circuit (1) and the input (IN) of the inversion circuit.
Claim 3
Dependent Claim
18 words
A feedback amplifier according to claim 1, wherein the feedback resistive element is a resistor (R 1 ).
Claim 4
Dependent Claim
38 words
A feedback amplifier according to claim 1, wherein the feedback resistive element is a field effect transistor (15,25) having a gate terminal (16,27) which receives a control voltage so as to vary the value of the feedback resistance.
Claim 5
Dependent Claim
19 words
A feedback amplifier according to claim 3, wherein a resistor (26) is connected in parallel with the transistor (25).
Claim 6
Dependent Claim
32 words
A feedback amplifier according to claim 1, wherein the feedback resistance element is a field effect transistor (25) in which a gate terminal and a source terminal are connected to each other.
Claim 7
Dependent Claim
21 words
A feedback amplifier according to any of the preceding claims, wherein the load element comprises a resistor ( R 2 ).
Claim 8
Dependent Claim
35 words
A feedback amplifier according to any of claims 1 to 5, wherein the load element comprises a field effect transistor (11) in which a gate terminal and a source terminal are connected to each other.
Claim 9
Dependent Claim
21 words
A feedback amplifier according to claim 7, wherein a resistor (23) is connected in parallel with the field effect transistor (22).
Claim 10
Dependent Claim
28 words
A feedback amplfier according to claim 7, wherein a series circuit of a diode (34) and a resistor (33) is connected in parallel with the field effect transistor.
Claim 11
Dependent Claim
36 words
A feedback amplifier according to any of the preceding claims, wherein the constant current active load (14) is a field effect transistor in which a gate terminal and a source terminal are connected to each other.
Claim 12
Dependent Claim
43 words
A feedback amplifier according to any of the preceding claims, wherein the input active element comprises a dual gate transistor (28), one gate thereof being connected to the input terminal (IN) and another gate thereof being connected to the feedback resistive element (25,26).
Claim 13
Dependent Claim
34 words
A feedback amplifier according to any of the preceding claims, wherein a buffer circuit (38,39) is connected between the output of the level shift circuit (1) and the feedback resistive element (R 1 ).
Claim 14
Dependent Claim
82 words
A feedback amplifier according to claim 12, wherein the buffer circuit comprises a first field effect transistor (38) having a drain connected to the electrical source and a gate connected to the output of the level shift circuit (1), and a second field effect transistor (39) having a drain connected to a source of the first field effect transistor (38) and to the feedback resistive element (R 1 ) and having a gate and a source which are connected to each other.
Claim 15
Dependent Claim
15 words
A feedback amplifier according to any of the preceding claims integrated onto a semiconductor substrate.
References Cited (Backward Citations)
No citation records indexed.
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