Patent US1581289A successfully refreshed from Google Patents.
EP0342735A1
Expired / Lapsed
EP
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Circuit for generating a pulse-shaped signal
Assignee: Koninklijke Philips NV
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Filing: 1989-05-10
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Granted: —
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Expires: 2009-05-10
Abstract
Abstract A first transistor (PM1) arranged as a current source is connected to the input (K1) of a current mirror (NM1, NM2), whose output (K2) is connected to a second transistor (PM2) arranged as a current source and to the output of the circuit. In the event of a temporary decrease in supply voltage this circuit will produce a pulse-shaped signal on its output, which signal can be employed as a reset signal in bistable circuits.
Inventors
- 👤 Kris Theo Paul Vanderhoydonck
- 👤 Bernardus Henricus Jozef Cornelissen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:00
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/37; H03K17/00; H03K17/22; H03K17/223; H03K17/30; H03K17/302
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
289 words
A circuit for generating a pulse signal on an output terminal of the circuit terminal of the circuit in the case of a predetermined variation of the supply voltage on two power-supply terminals of the circuit, comprising - a first transistor of a first conductivity type, having its main current path arranged between a first power-supply terminal and a first junction point, - a second transistor of the first conductivity, having its main current path arranged between the first power-supply terminal and a second junction point, - a first transistor of a second conductivity type, having its main current path arranged between a second power-supply terminal and the first junction point, - a second transistor of the second conductivity type, having its main current path arranged between the second power-supply terminal and the second junction point, - the output terminal being connected to the second junction point, - the gate terminals of the first and the second transistors of the first conductivity type being connected to each other and to the first junction point and the gate terminal of the second transistor of the second transistor of the second conductivity type being connected to the first power-supply terminal, - characterized in that the gate terminal of the first transistor of t.he second conductivity type being connected to the first juncion point, - and the transistors being dimensioned in such a way that in operation in the case of a supply voltage above a predetermined limit value the voltage on the output terminal approximates to the voltage on the first power-supply terminal and in the case of a supply voltage below the predetermined limit value the voltage on the output terminal approximates to the voltage on the second power-supply terminal.
Claim 2
Dependent Claim
289 words
A circuit for generating a pulse signal on an output terminal of the circuit terminal of the circuit in the case of a predetermined variation of the supply voltage on two power-supply terminals of the circuit, comprising - a first transistor of a first conductivity type, having its main current path arranged between a first power-supply terminal and a first junction point, - a second transistor of the first conductivity, having its main current path arranged between the first power-supply terminal and a second junction point, - a first transistor of a second conductivity type, having its main current path arranged between a second power-supply terminal and the first junction point, - a second transistor of the second conductivity type, having its main current path arranged between the second power-supply terminal and the second junction point, - the output terminal being connected to the second junction point, - the gate terminals of the first and the second transistors of the first conductivity type being connected to each other and to the first junction point and the gate terminal of the second transistor of the second transistor of the second conductivity type being connected to the first power-supply terminal, - characterized in that the gate terminal of the first transistor of t.he second conductivity type being connected to the first juncion point, - and the transistors being dimensioned in such a way that in operation in the case of a supply voltage above a predetermined limit value the voltage on the output terminal approximates to the voltage on the first power-supply terminal and in the case of a supply voltage below the predetermined limit value the voltage on the output terminal approximates to the voltage on the second power-supply terminal.
Claim 3
Dependent Claim
25 words
A circuit as claimed in Claim 1, characterized in that a capacitive element is arranged between the first junction point and the first power-supply terminal.
Claim 4
Dependent Claim
46 words
A circuit as claimed in Claim 2, characterized in that said capacitive element comprises a third transistor of the first conductivity type, whose main current path is short-circuited and connected to the first power-supply terminal and whose gate terminal is connected to the first junction point.
Claim 5
Dependent Claim
111 words
A circuit for generating a pulse-shaped signal in the case of predetermined supply-voltage variations, characterized in that the circuit comprises: a) a circuit as claimed in Claim 1; b) a circuit as claimed in Claim 2 or 3; c) an OR-circuit having two inputs and one output and a first and a second power-supply terminal; d) all the first and all the second power-supply terminals being interconnected; e) the outputs of the circuits defined in a) and b) each being connected to one input of the OR-circuit defined in c); f) and the pulse-shaped signal appearing on the output of the OR-circuit in the case of predetermined supply-voltage variations during operation.
References Cited (Backward Citations)
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