Resistance adjusting circuit and semiconductor integrated...

Details Resistance adjusting circuit and semiconductor integrated... Resistance adjusting circuit and semiconductor integrated...

2008-06-10

2009-11-17

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Automatically controlled systems

Impedance matching

Reexamination Certificate

active

07619488

ABSTRACT:
A resistance adjusting circuit including a semiconductor integrated circuit includes a reference voltage generating circuit which generates a reference voltage corresponding to a resistance of an external resistor element connected to the semiconductor integrated circuit, a comparison voltage generating circuit which comprises a replica resistor circuit whose resistance is adjusted according to a resistance control signal and generates a comparison voltage corresponding to a resistance of the replica resistor circuit, a main body resistor circuit which has substantially the same configuration as that of the replica resistor circuit and whose resistance is adjusted according to the resistance control signal, and a control signal generating circuit which receives the reference and comparison voltages and converts the voltages to frequency signals corresponding to the voltages, integrates the frequency signals to produce integration data of the frequency signals, and generates the resistance control signal based upon a difference between the integration data.

REFERENCES:
patent: 6836170 (2004-12-01), Kitagawa et al.
patent: 6911875 (2005-06-01), Lee et al.
patent: 7170364 (2007-01-01), Lee et al.
patent: 2001-094048 (2001-04-01), None

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