| 摘要 |
A fine tuning method of a digital tuner is provided to reset several elements of an error rate to a suitable value in a phase locked loop changed due to external disturbances or noise during a desired broadcasting channel selection. A fine tuning method of a digital tuner includes: selecting a desired broadcasting channel when a broadcasting signal is received through an antenna(21); judging whether an automatic gain control time constant error rate of the selected broadcasting channel is less than a set value(22); changing the automatic gain control time constant error rate(23); judging whether an automatic gain control TOP error rate is less than the set value(24); changing the automatic gain control TOP error rate(25); judging whether a charge pump error rate associated with a next performance is less than the set value(26); changing a charge pump value(27); and storing the adjusted automatic gain control time constant value, automatic gain control TOP value, and charge pump value according to the frequencies of the selected channel(28).
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