Low-profile stacked-die MEMS resonator system
First Claim
1. A microelectromechanical-system (MEMS) resonator system packaging structure having a low cross-sectional profile, the packaging structure comprising:
- a lead frame including an electrical lead having internal and external electrical contact surfaces at respective first and second heights within the cross-sectional profile of the packaging structure, and a die-mounting surface at a third height between the first and second heights;
a resonator-control chip mounted to the die-mounting surface of the electrical lead and wire-bonded to the internal electrical contact surface of the electrical lead;
a MEMS resonator chip mounted to the resonator-control chip in a stacked die configuration and electrically coupled to the resonator-control chip; and
a package enclosure that encloses the MEMS resonator chip, resonator-control chip and internal electrical contact and die-mounting surfaces of the electrical lead, and that exposes the external contact surface of the electrical lead at an external surface of the packaging structure.
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Accused Products
Abstract
A low-profile packaging structure for a microelectromechanical-system (MEMS) resonator system includes an electrical lead having internal and external electrical contact surfaces at respective first and second heights within a cross-sectional profile of the packaging structure and a die-mounting surface at an intermediate height between the first and second heights. A resonator-control chip is mounted to the die-mounting surface of the electrical lead such that at least a portion of the resonator-control chip is disposed between the first and second heights and wire-bonded to the internal electrical contact surface of the electrical lead. A MEMS resonator chip is mounted to the resonator-control chip in a stacked die configuration and the MEMS resonator chip, resonator-control chip and internal electrical contact and die-mounting surfaces of the electrical lead are enclosed within a package enclosure that exposes the external electrical contact surface of the electrical lead at an external surface of the packaging structure.
83 Citations
21 Claims
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1. A microelectromechanical-system (MEMS) resonator system packaging structure having a low cross-sectional profile, the packaging structure comprising:
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a lead frame including an electrical lead having internal and external electrical contact surfaces at respective first and second heights within the cross-sectional profile of the packaging structure, and a die-mounting surface at a third height between the first and second heights; a resonator-control chip mounted to the die-mounting surface of the electrical lead and wire-bonded to the internal electrical contact surface of the electrical lead; a MEMS resonator chip mounted to the resonator-control chip in a stacked die configuration and electrically coupled to the resonator-control chip; and a package enclosure that encloses the MEMS resonator chip, resonator-control chip and internal electrical contact and die-mounting surfaces of the electrical lead, and that exposes the external contact surface of the electrical lead at an external surface of the packaging structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of packaging a microelectromechanical-system (MEMS) resonator system within a low-profile packaging structure, the method comprising:
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forming a lead frame having a plurality of electrical leads, including an electrical lead having internal and external electrical contact surfaces at respective first and second heights within a cross-sectional profile of the packaging structure, and a die-mounting surface at an intermediate height between the first and second heights; mounting a resonator-control chip to the die-mounting surface of the electrical lead such that at least a portion of the resonator-control chip is disposed between the first and second heights within the cross-sectional profile of the packaging structure; wire-bonding the resonator-control chip to the internal electrical contact surface of the electrical lead; mounting a MEMS resonator chip to the resonator-control chip in a stacked die configuration; electrically coupling the MEMS resonator chip to the resonator-control chip; and enclosing the MEMS resonator chip, resonator-control chip and internal electrical contact and die-mounting surfaces of the electrical lead within a package enclosure that exposes the external electrical contact surface of the electrical lead at an external surface of the packaging structure. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification