Radio receiver with programmable digital tuner immune to manufacturing variations in varactor capacitance
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United States of America Patent
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Nov 24, 1998
Grant Date -
N/A
app pub date -
Sep 24, 1996
filing date -
Sep 29, 1995
priority date (Note) -
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Abstract
A storing circuit for storing control data for a varactor diode, a frequency divided data generating circuit for generating frequency divided data to set the local oscillating frequency of a local oscillating circuit, a determining circuit for computing a receiving frequency from the frequency divided data and determining whether or not the receiving frequency is within a designated frequency range and an arithmetic circuit for executing computation in compliance with data indicating the receiving frequency and control data stored in the storing circuit are provided, and the capacitance of the variable capacitance element is controlled by analog-conversion of an output signal from the arithmetic circuit, thus tracking errors caused by variation in tuning elements are prevented and an RF tuning circuit control interval is reduced.
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