Wave transmission lines and networks – Automatically controlled systems – Impedance matching
Reexamination Certificate
2008-03-05
2009-06-30
Jones, Stephen E (Department: 2817)
Wave transmission lines and networks
Automatically controlled systems
Impedance matching
C333S032000
Reexamination Certificate
active
07554417
ABSTRACT:
An impedance adjusting circuit includes a semiconductor device accommodated in a semiconductor device case which has case pins and having a folded conductive line; an external reference resistor connected between a positive power supply line and a first one of the case pins, wherein a first line between the first case pin and the semiconductor device has a specific resistance; a first reference voltage generation resistor connected between the power supply line and a second one of the case pins; a second reference voltage generation resistor connected between the ground and a third one of the case pins; a resistance circuit comprising a second line between the second case pin and the folded conductive line and a third line between the third case pin and the folded conductive line, wherein a resistance between the second case pin and the third case pin is equal to the specific resistance; and a fourth line connected from the semiconductor device to the ground through the second reference voltage generation resistor and having a resistance equal to the specific resistance. The semiconductor device includes an adjusting circuit having a buffer and configured to adjust an output impedance of the buffer to be adaptive for a predetermined impedance.
REFERENCES:
patent: 2005229177 (2005-08-01), None
Jones Stephen E
NEC Corporation
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