Impedance adjustable circuit having on-chip adjustable...

Details Impedance adjustable circuit having on-chip adjustable... Impedance adjustable circuit having on-chip adjustable...

2006-08-18

2008-03-18

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S086000, C327S108000

Reexamination Certificate

active

07345504

ABSTRACT:
An adjustable termination resistor includes a reference resistor, a current mirror circuit, a calibration transistor-resistor array, a digital code generator, a comparator, a decision and latch circuit and a termination resistor. The mirror current generated from the current mirror circuit flows through the calibration transistor-resistor array to result in a comparing voltage across the calibration transistor-resistor array. The resistance of the calibration transistor-resistor array is determined according to a digital code generated from the digital code generator. The voltage level outputted from the comparator is changed from a first state to a second state when the digital code generator up counts to a target digital code such that the comparing voltage is just greater than the reference voltage. The decision and latch circuit records the target digital code into therein. The resistance of the termination resistor is adjustable according to the target digital code.

REFERENCES:
patent: 5235222 (1993-08-01), Kondoh et al.
patent: 6307791 (2001-10-01), Otsuka et al.
patent: 6570402 (2003-05-01), Koo et al.
patent: 6690211 (2004-02-01), Huang et al.
patent: 6947336 (2005-09-01), Kim et al.
patent: 6949949 (2005-09-01), Lundberg
patent: 7170318 (2007-01-01), Kim et al.

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