EP0969633A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Differential line driver
Assignee: NEC Electronics Corp
•
Filing: 1999-06-29
•
Granted: —
•
Expires: 2019-06-29
Abstract
Abstract when a driver circuit unit issues data to a receiver through a transmission line, the unit perform a matching operation to the characteristic impedance of the transmission line so that the logic level of an input signal received by the receiver is properly controlled. The unit comprises: a first push pull circuit (2) for issuing an output signal to an output terminal (5A) through resistors (2B, 2C) when transmitted data is issued to an input terminal (1A), the output signal having its logic level correspond to the transmitted data; a second push pull circuit (3) for issuing an negative-phase output signal to an output terminal (5B) through resistors (3B, 3C) when negative-phase data, which is one reversed in phase of the above transmitted data, is issued to an input terminal (1B), the negative-phase output signal having its logic level correspond to the negative-phase data; and, a resistor (4) connected between the output terminal (5A) and the output terminal (5B).
Inventors
- 👤 Masashi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 11:10
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/028; H04L25/0278; H04L25/0272
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A driver circuit unit having a first and second output
terminal (5A, 5B) both connected with a receiver through a
first and second transmission line (102, 103),
respectively, said driver circuit unit characterized by
comprising: a first circuit (2) for issuing an output signal to
said first output terminal (5A) through a resistor (2B, 2C)
when transmitted data is issued to a first input terminal
(1A), said output signal having its logic level correspond
to said transmitted data; a second circuit (3) for issuing an negative-phase output
signal to said second output terminal (5B) through a
resistor (3B, 3C) when negative-phase data, which is one
reversed in phase of said transmitted data, is issued to a
second input terminal (1B) said negative-phase output
signal having its logic level correspond to said
negative-phase data; and an adjusting resistor (4) connected between said first
and said second output terminal (5A, 5B).
Claim 2
Dependent Claim
162 words
A driver circuit unit having a first output terminal
(5A) and a second output terminal (5B) connected with a
receiver through a first and a second transmission line,
respectively, said driver circuit unit characterized by
comprising: a first circuit (2) for issuing an output signal to
said first output terminal (5A) through a first resistor
(2B) and a second transistor (2B) when transmitted data is
issued to a first input terminal (1A), said output signal
having its logic level correspond to said transmitted data; a second circuit (3) for issuing an negative-phase
output signal to said second output terminal (5B) through a
third resistor (3B) and a fourth resistor (3C) when
negative-phase data, which is one reversed in phase of said
transmitted data, is issued to a second input terminal
(1B), said negative-phase output signal having its logic
level correspond to said negative-phase data; and an adjusting resistor (4) connected between said first
output terminal (5A) and said second output terminal (5B).
Claim 3
Dependent Claim
125 words
The driver circuit unit according to claim 1,
characterized in that said first circuit (2) comprises: a first switching element (2A) connected between a
power supply line and said first output terminal (5A), said
first switching element (2A) being turned ON and OFF
according to said transmitted data; said first resistor (2B) interposed between said first
switching element (2A) and said first output terminal (5A); a second switching element (2D) connected between said
first output terminal (5A) and the ground, said second
switching element (2D) being turned ON and OFF according to
said transmitted data when said first switching element
(2C) is turned OFF and ON, respectively; and said second resistor (2C) interposed between said
second switching element (2D) and said first output
terminal (5A).
Claim 4
Dependent Claim
33 words
The driver circuit unit according to claim 2,
characterized in that each of said first switching element
(2A) and said second switching element (2D) is constructed
of an insulated-gate type field effect transistor.
Claim 5
Dependent Claim
45 words
The driver circuit unit according to claim 3,
characterized in that said first switching element (2A) and
said second switching element (2D) both of which are in
conductive state are smaller in resistance value than said
first resistor (2B) and said second resistor (2C),
respectively.
Claim 6
Dependent Claim
129 words
The driver circuit unit according to any of claims 1
to 5, characterized in that said second circuit (3)
comprises: a third switching element (3A) connected between a
power supply line and said second output terminal (5B),
said third switching element (3A) being turned ON and OFF
according to said transmitted data; a third resistor (3B) interposed between said third
switching element (3A) and said second output terminal
(5B); a fourth switching element (3D) connected between said
second output terminal (5B) and the ground, said fourth
switching element (3D) being turned ON and OFF according to
said transmitted data when said third switching element
(3A) is turned OFF and ON, respectively, and a fourth resistor (3C) interposed between said fourth
switching element (3D) and said second output terminal
(5B).
Claim 7
Dependent Claim
37 words
The driver circuit unit according to any of claims 1
to 6, characterized in that each of said third switching
element (3A) and said fourth switching element (3D) is
constructed of an insulated-gate type field effect
transistor.
Claim 8
Dependent Claim
49 words
The driver circuit unit according to any of claims 1
to 7, characterized in that said third switching element
(3A) and said fourth switching element (3D) both of which
are in conductive state are smaller in resistance value
than said third resistor (3B) and said fourth resistor
(3C), respectively.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.