Semiconductor device
View Patent ↗In a semiconductor device such as a high-frequency power amplifier module, a plurality of amplifying means are formed on a semiconductor chip which is mounted on a main surface of a wiring substrate, and electrodes of the semiconductor chip are electrically connected by wires to electrodes of the wiring substrate. In order to make the high-frequency power amplifier module small in size, a substrate-side bonding electrode electrically connected to a wire set at a fixed reference electric potential is place at a location farther from a side of the semiconductor chip than a substrate-side output electrode electrically connected to an output wire. A substrate-side input electrode electrically connected to an input wire is located at a distance from the side of the semiconductor chip about equal to the distance from the side of the semiconductor chip to the substrate-side output electrode, or at a location farther from the side of the semiconductor chip than the substrate-side bonding electrode is.
1. A semiconductor device including an RF power amplifier circuit, comprising:
(a) a semiconductor chip including:
an input stage transistor of the RF power amplifier circuit having a first input node and a first output node,
an output stage transistor of the RF power amplifier circuit having a second input node and a second output node, the first output node being electrically coupled to the second input node; and
(b) a mounting substrate over which the semiconductor chip is mounted,
the mounting substrate having a main surface and a back surface opposite each other, comprising:
a plurality of external terminals disposed over the back surface;
a conductive plate formed over the main surface of the mounting substrate; and
a through-hole wire formed right below the conductive plate in the mounting substrate,
wherein the semiconductor chip is disposed over the conductive plate,
one of the external terminals is electrically coupled to the first and second input nodes,
another one of the external terminals is electrically coupled to the first and second output nodes,
the plurality of external terminals includes a reference-potential external terminal, and
the conductive plate and the reference-potential external terminal are electrically coupled via the through-hole wire.
2. A semiconductor device according to claim 1 , wherein
an input terminal is disposed over the main surface of the mounting substrate,
an output terminal is disposed over the main surface of the mounting substrate,
an input bonding wire is disposed over the main surface of the mounting substrate and electrically couples the input terminal and the first input node,
an output bonding wire is disposed over the main surface of the mounting substrate and electrically couples the output terminal and the second output node.
3. A semiconductor device according to claim 2 , wherein
the semiconductor chip has a quadrilateral shape having a pair of first sides and a pair of second sides in a plan view,
the input bonding wire overlaps with one of the pair of first sides of the semiconductor chip in a plan view, and
the output bonding wire overlaps with one of the pair of second sides of the semiconductor chip in a plan view.
4. A semiconductor device according to claim 1 , wherein
an input terminal is disposed over the main surface of the mounting substrate,
an output terminal is disposed over the main surface of the mounting substrate,
an input bonding wire is disposed over the main surface of the mounting substrate and electrically couples the input terminal and the first input node,
a plurality of output bonding wires are disposed over the main surface of the mounting substrate and electrically couples the output terminal and the second output node.
5. A semiconductor device according to claim 1 , wherein a capacitive element is disposed over the main surface of the mounting substrate.
6. A semiconductor device according to claim 2 , wherein a capacitive element is electrically coupled to the second output node.
7. A semiconductor device according to claim 1 , wherein a resistive element is disposed over the main surface of the mounting substrate.
8. A semiconductor device according to claim 1 , wherein the input stage and the output stage transistors are hetero-junction bipolar transistors.
9. A semiconductor device according to claim 1 , wherein the mounting substrate is comprised of laminated insulating layers.
10. A semiconductor device according to claim 1 , wherein the RF power amplifier circuit is used for a cellular phone.