Differential output circuit
DC
First Claim
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1. A differential output circuit comprising:
- a first output line;
a second output line;
an output impedance connected between said first and second lines, wherein said output impedance comprises an active device including a control input for receiving a control signal value for controlling the impedance value of said active device;
a bias circuit responsive to a voltage across a reference impedance element for generating said control signal value for controlling the impedance value of said active device; and
an output driver stage connected to said first and second output lines for supplying first and second differential driven output signals to said first and second output lines, respectively;
wherein said output driver stage is connected to receive reference signal levels from said bias circuit.
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Abstract
A differential output circuit has first and second output lines and an output impedance connected between the first and second lines. The output impedance includes an active device (e.g., a field effect transistor) having a control input for receiving a control signal value for controlling the impedance value of the active device. A bias circuit is responsive to a reference impedance element for generating the control signal value for controlling the impedance value of the active device. An output driver stage is connected to the first and second output lines for supplying first and second differential driven output signals to the first and second output lines, respectively. An integrated circuit can include a number of differential output circuits and a common bias circuit responsive to a single reference impedance element for generating the control signal value for controlling the impedance value of each active device.
29 Citations
10 Claims
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1. A differential output circuit comprising:
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a first output line; a second output line; an output impedance connected between said first and second lines, wherein said output impedance comprises an active device including a control input for receiving a control signal value for controlling the impedance value of said active device; a bias circuit responsive to a voltage across a reference impedance element for generating said control signal value for controlling the impedance value of said active device; and an output driver stage connected to said first and second output lines for supplying first and second differential driven output signals to said first and second output lines, respectively; wherein said output driver stage is connected to receive reference signal levels from said bias circuit. - View Dependent Claims (2, 3)
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4. An integrated circuit comprising:
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a plurality of differential output circuits, each said differential output circuit having a pair of first and second output lines and an output impedance connected between said first and second output lines, wherein said output impedance comprises an active device including a control input for receiving a control signal value for controlling the impedance value of said active device; a common bias circuit responsive to a voltage across a reference impedance element for generating said control signal value for controlling the impedance value of each said active device; and first and second inputs for connection to the reference impedance element, wherein said reference impedance element is external and outside of said integrated circuit. - View Dependent Claims (6, 7)
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5. An integrated circuit comprising:
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a differential output circuit, said differential output circuit having first and second output lines and an output impedance connected between said first and second output lines, wherein said output impedance comprises an active device including a control input for receiving a control signal value for controlling the impedance value of said active device; a common bias circuit operatively connected to a reference impedance element for generating said control signal value for controlling the impedance value of said active device; an output driver stage connected to said first and second output lines; and first and second inputs for connection to the reference impedance element, wherein said reference impedance element is external and outside of said integrated circuit. - View Dependent Claims (8, 9)
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10. A differential output circuit comprising:
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a first output line; a second output line; an output impedance connected between said first and second lines, wherein said output impedance comprises an active device including a control input for receiving a control signal value for controlling the impedance value of said active device; a bias circuit responsive to a voltage across a reference impedance element for generating said control signal value for controlling the impedance value of said active device; and an output driver stage connected to said first and second output lines for supplying first and second differential driven output signals to said first and second output lines, respectively; and a feedback path from the first and second output lines for controlling supply voltages to the output driver stage.
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Specification
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Litigation Data
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Current AssigneeAvago Technologies General IP PTE Limited (Broadcom, Inc.)
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Original AssigneeLSI Logic Corporation (Broadcom, Inc.)
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InventorsQuinlan, Sion Christopher, Burrows, David Frank, Hunt, Kenneth Stephen
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Primary Examiner(s)Wells, Kenneth B.
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Assistant Examiner(s)Nguyen, Hai L.
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Application NumberUS08/965,128Time in Patent Office838 DaysField of Search327/519, 327/309, 327/315, 327/317, 327/318, 327/321, 327/322, 327/324, 327/327, 327/328, 327/331, 327/65, 327/109, 327/52, 327/53, 327/54, 327/55, 330/284US Class Current327/331CPC Class CodesH03K 19/018557 Coupling arrangements; Impe...H04L 25/0272 Arrangements for coupling t...H04L 25/0278 Arrangements for impedance ...H04L 25/028 Arrangements specific to th...
