Patent EP0340725A2 successfully refreshed from Google Patents.
EP0340725A2
Expired / Lapsed
EP
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ECL-TTL level converting circuit
Assignee: NEC Corp
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Filing: 1989-05-02
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Granted: —
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Expires: 2009-05-02
Abstract
Abstract An ECL-TTL level converting circuit comprises a first transistor (Q1) having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source (ICS), and a second transistor (Q2) having a collector connected to a positive voltage line through a first resistor (R1) and an emitter commonly connected to the emitter of the first transistor (Q1). The base of one of the first and second transistors is connected to receive a reference voltage (Vref), and the base of the other of the first and second transistors is connected to receive an input signal (IN). A third transistor (Q3) is connected at its base to the collector of the second transistor (Q2) and at its collector to the positive voltage line through a second resistor (R2). An emitter of the third transistor (Q3) is connected to the ground line through a third resistor (R3) and also connected to a base of a fourth transistor (Q4) having an emitter connected to the ground line. A collector of the third transistor is connected to a base of a fifth transistor (Q5) having a collector connected to the positive voltage line through a fourth resistor (R4), and an emitter connected to a collector of the fourth transistor (Q4) through a diode (D1) which is connected in a forward direction from the emitter of the fifth transistor (Q5) to the collector of the fourth transistor (Q4). With this arrangement, an output signal (OUT) can be obtained from the collector of the fourth transistor.
Inventors
- 👤 Kouji C/O Nec Corporation Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/0175; H03K19/018; H03K19/01806; H03K19/01812
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
220 words
An ECL-TTL level converting circuit comprising a first transistor having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source, second transistor having a collector connected to a positive voltage line through a first resistor and an emitter commonly connected to the emitter of the first transistor, the base of one of the first and second transistors being connected to receive a reference voltage and the base of the other of the first and second transistors being connected to receive an input signal, a third transistor having a collector connected to the positive voltage line through a second resistor, an emitter connected to the ground line through a third resistor and a base connected to the collector of the second transistor so that the collector of the third transistor outputs a first drive signal and the emitter of the third transistor outputs a second drive signal, an amplifying stage having an input connected to the collector of the third transistor, and a fourth transistor having a collector connected to an output side of the amplifying stage, an emitter connected to the ground line and a base connected to the emitter of the third transistor, so that an output signal can be obtained from the collector of the fourth transistor.
Claim 2
Dependent Claim
220 words
An ECL-TTL level converting circuit comprising a first transistor having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source, second transistor having a collector connected to a positive voltage line through a first resistor and an emitter commonly connected to the emitter of the first transistor, the base of one of the first and second transistors being connected to receive a reference voltage and the base of the other of the first and second transistors being connected to receive an input signal, a third transistor having a collector connected to the positive voltage line through a second resistor, an emitter connected to the ground line through a third resistor and a base connected to the collector of the second transistor so that the collector of the third transistor outputs a first drive signal and the emitter of the third transistor outputs a second drive signal, an amplifying stage having an input connected to the collector of the third transistor, and a fourth transistor having a collector connected to an output side of the amplifying stage, an emitter connected to the ground line and a base connected to the emitter of the third transistor, so that an output signal can be obtained from the collector of the fourth transistor.
Claim 3
Dependent Claim
19 words
A circuit claimed in Claim 1 wherein each of the third and fourth transistors is a Schottky diode transistor.
Claim 4
Dependent Claim
74 words
A circuit claimed in Claim 1 wherein the amplifying stage is composed of a fifth transistor having a collector connected to the positive voltage line through a fourth resistor, a base connected to the collector of the third transistor and an emitter connected to the collector of the fourth transistor through a diode which is connected in a forward direction from the emitter of the fifth transistor to the collector of the fourth transistor.
Claim 5
Dependent Claim
19 words
A circuit claimed in Claim 3 wherein each of the third and fourth transistors is a Schottky diode transistor.
Claim 6
Dependent Claim
217 words
An ECL-TTL level converting circuit comprising a first transistor having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source, a second transistor having a collector connected to a positive voltage line through a first resistor and an emitter commonly connected to the emitter of the first transistor, the base of one of the first and second transistors being connected to receive a reference voltage and the base of the other of the first and second transistors being connected to receive an input signal, a third transistor having a collector connected to the positive voltage line through a second resistor, an emitter connected to the ground line through a third resistor and a base connected to the collector of the second transistor so that the collector of the third transistor outputs a first drive signal and the emitter of the third transistor outputs a second drive signal, an amplifying stage operating in accordance with the first drive signal, and a fourth transistor having a collector connected to an ouput side of the amplifying stage, an emitter connected to the ground line and a base connected to receive the second drive signal, so that an output signal can be obtained from the collector of the fourth transistor.
Claim 7
Dependent Claim
217 words
An ECL-TTL level converting circuit comprising a first transistor having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source, a second transistor having a collector connected to a positive voltage line through a first resistor and an emitter commonly connected to the emitter of the first transistor, the base of one of the first and second transistors being connected to receive a reference voltage and the base of the other of the first and second transistors being connected to receive an input signal, a third transistor having a collector connected to the positive voltage line through a second resistor, an emitter connected to the ground line through a third resistor and a base connected to the collector of the second transistor so that the collector of the third transistor outputs a first drive signal and the emitter of the third transistor outputs a second drive signal, an amplifying stage operating in accordance with the first drive signal, and a fourth transistor having a collector connected to an ouput side of the amplifying stage, an emitter connected to the ground line and a base connected to receive the second drive signal, so that an output signal can be obtained from the collector of the fourth transistor.
Claim 8
Dependent Claim
19 words
A circuit claimed in Claim 5 wherein each of the third and fourth transistors is a Schottky diode transistor.
Claim 9
Dependent Claim
73 words
A circuit claimed in Claim 6 wherein the amplifying stage is composed of a fifth transistor having a collector connected to the positive voltage line through a fourth resistor, a base connected to receive the first drive signal and an emitter connected to the collector of the fourth transistor through a diode which is connected in a forward direction from the emitter of the fifth transistor to the collector of the fourth transistor.
Claim 10
Dependent Claim
171 words
An ECL-TTL level converting circuit comprising a first transistor having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source, a second transistor having a collector connected to a positive voltage line through a first resistor and an emitter commonly connected to the emitter of the first transistor, the base of one of the first and second transistors being connected to receive a reference voltage and the base of the other of the first and second transistors being connected to receive an input signal, a third transistor having a collector connected to the positive voltage line through a second resistor, an emitter connected to the ground line through a third resistor and a base connected to the collector of the second transistor, and a fourth transistor having an emitter connected to the ground line and a base connected to the emitter of the third transistor, so that an output signal can be obtained from a collector of the fourth transistor.
Claim 11
Dependent Claim
171 words
An ECL-TTL level converting circuit comprising a first transistor having a collector connected to a ground line and an emitter connected to a negative voltage line through a constant current source, a second transistor having a collector connected to a positive voltage line through a first resistor and an emitter commonly connected to the emitter of the first transistor, the base of one of the first and second transistors being connected to receive a reference voltage and the base of the other of the first and second transistors being connected to receive an input signal, a third transistor having a collector connected to the positive voltage line through a second resistor, an emitter connected to the ground line through a third resistor and a base connected to the collector of the second transistor, and a fourth transistor having an emitter connected to the ground line and a base connected to the emitter of the third transistor, so that an output signal can be obtained from a collector of the fourth transistor.
Claim 12
Dependent Claim
19 words
A circuit claimed in Claim 8 wherein each of the third and fourth transistors is a Schottky diode transistor.
Claim 13
Dependent Claim
69 words
A circuit claimed in Claim 9 further including a fifth transistor having a collector connected to the positive voltage line through a fourth resistor, a base connected to the collector of the third transistor and an emitter connected to the collector of the fourth transistor through a diode which is connected in a forward direction from the emitter of the fifth transistor to the collector of the fourth transistor.
References Cited (Backward Citations)
No citation records indexed.
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