Shielded front end receiver circuit with IF amplifier on an IC
First Claim
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1. A semiconductor integrated circuit for a radio receiver, comprising:
- a front end circuit block which includes at least an oscillation circuit and a mixing circuit for converting a radio frequency signal to an intermediate frequency signal, said front end circuit block being formed in a region of a semiconductor chip, said oscillation circuit being formed in a corner of said semiconductor chip;
an amplifying circuit block formed in another region of said chip for amplifying said intermediate frequency signal and limiting an amplitude thereof, said blocks being separated from each other for reducing mutual interference from arising as between said blocks;
a plurality of shield electrodes for absorbing undesirable radiation generated from said first end circuit block and for absorbing undesirable radiation which would be otherwise interfer with said front end circuit block, said shield electrodes covering said front end circuit block, one of said shield electrodes covering only said oscillation circuit;
a dedicated contact pad connected to the one shield electrode; and
other contact pads which are connected to the other of said shield electrodes, said dedicated contact pad and said other contact pads being different and separated from each other so as to avoid having a common conductor impedance with each other.
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Abstract
A semiconductor integrated circuit for a radio comprises: a front end circuit block (1) including at least an oscillation circuit (1b) and a mixing circuit (1c), for converting an RF signal to an IF signal; and an IF amplifying circuit block (2) for amplifying the IF signal and limiting an amplitude thereof, and the front end circuit block (1) is covered with shield electrodes (17, 17a, 17b, 17c) connected to a predetermined potential.
70 Citations
11 Claims
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1. A semiconductor integrated circuit for a radio receiver, comprising:
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a front end circuit block which includes at least an oscillation circuit and a mixing circuit for converting a radio frequency signal to an intermediate frequency signal, said front end circuit block being formed in a region of a semiconductor chip, said oscillation circuit being formed in a corner of said semiconductor chip; an amplifying circuit block formed in another region of said chip for amplifying said intermediate frequency signal and limiting an amplitude thereof, said blocks being separated from each other for reducing mutual interference from arising as between said blocks; a plurality of shield electrodes for absorbing undesirable radiation generated from said first end circuit block and for absorbing undesirable radiation which would be otherwise interfer with said front end circuit block, said shield electrodes covering said front end circuit block, one of said shield electrodes covering only said oscillation circuit; a dedicated contact pad connected to the one shield electrode; and other contact pads which are connected to the other of said shield electrodes, said dedicated contact pad and said other contact pads being different and separated from each other so as to avoid having a common conductor impedance with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification