Semiconductor device having balanced circuit for use in high frequency band
First Claim
Patent Images
1. A semiconductor device comprising:
- an input-side matching circuit having paired first and second input-side circuits;
an output-side matching circuit having paired first and second output-side circuits;
first and second transistors for amplification, wherein the first transistor is connected between the first input-side circuit of the input-side matching circuit and the first output-side circuit of the output-side matching circuit and the second transistor is connected between the second input-side circuit of the input-side matching circuit and the second output-side circuit of the output-side matching circuit;
a first balanced circuit connected to the input-side matching circuit and respectively supplying to the first and second input-side circuits of the input-side matching circuit two signals different in phase by 180 degrees; and
a second balanced circuit connected to the output-side matching circuit, and respectively receiving from the first and second output-side circuits of the output-side matching circuit two signals different in phase by 180 degrees, wherein at least one of the first and second balanced circuits includes a first inductor, a second inductor, and a capacitor connected between the first inductors and the second inductor, the capacitor being connected to a virtual grounding node.
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Abstract
A semiconductor chip for amplification is connected between input-side and output-side matching circuits, and each of matching circuits includes balanced circuits which receive signals different in phase by 180 degrees, divided from an input signal. The balanced circuits are connected at a virtual grounding point, which is used as a grounding point sensitive to RF characteristics in an IPD. Thus, a semiconductor device can be free from influence of variations of grounding wires and can be reduced in size, weight, and cost.
29 Citations
13 Claims
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1. A semiconductor device comprising:
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an input-side matching circuit having paired first and second input-side circuits; an output-side matching circuit having paired first and second output-side circuits; first and second transistors for amplification, wherein the first transistor is connected between the first input-side circuit of the input-side matching circuit and the first output-side circuit of the output-side matching circuit and the second transistor is connected between the second input-side circuit of the input-side matching circuit and the second output-side circuit of the output-side matching circuit; a first balanced circuit connected to the input-side matching circuit and respectively supplying to the first and second input-side circuits of the input-side matching circuit two signals different in phase by 180 degrees; and a second balanced circuit connected to the output-side matching circuit, and respectively receiving from the first and second output-side circuits of the output-side matching circuit two signals different in phase by 180 degrees, wherein at least one of the first and second balanced circuits includes a first inductor, a second inductor, and a capacitor connected between the first inductors and the second inductor, the capacitor being connected to a virtual grounding node. - View Dependent Claims (2, 4, 7)
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3. A semiconductor device comprising:
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an input-side matching circuit having paired first and second input-side circuits; an output-side matching circuit having paired first and second output-side circuits; first and second transistors for amplification, wherein the first transistor is connected between the first input-side circuit of the input-side matching circuit and the first output-side circuit of the output-side matching circuit and the second transistor is connected between the second input-side circuit of the input-side matching circuit and the second output-side circuit of the output-side matching circuit; a first balanced circuit connected to the input-side matching circuit and respectively supplying to the first and second input-side circuits of the input-side matching circuit two signals different in phase by 180 degrees; and a second balanced circuit connected to the output-side matching circuit, and respectively receiving from the first and second output-side circuits of the output-side matching circuit two signals different in phase by 180 degrees, wherein at least one of the first and second balanced circuits includes a first capacitor, a second capacitor, and a ground inductor connected between the first and second capacitors. - View Dependent Claims (5, 6, 8, 9, 10)
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11. A semiconductor device comprising:
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an input-side signal-dividing circuit; an output-side signal-combining circuit; a plurality of first balanced circuits connected in parallel to each other, the plurality of first balanced circuits being connected to the input-side signal-dividing circuit, each of the first balanced circuits outputting a pair of output signals different in phase by 180 degrees; a plurality of second balanced circuits connected in parallel to each other, the plurality of second balanced circuits being connected to the output-side signal-combining circuit, each of the second balanced circuits receiving a pair of signals different in phase by 180 degrees; and a plurality of transistors for amplification, each of the transistors being located between and connected to the first and second balanced circuits, wherein at least one of the plurality of first balanced circuits and of the plurality of second balanced circuits is arranged so that a pair of signal lines carrying signals identical in phase are connected to each other via a resistor, and a first of the pair of signal lines is connected to a first of the plurality of balanced circuits and a second of the pair of signal lines is connected to a second of the plurality of balanced circuits, adjacent to the first of the plurality of balanced circuits. - View Dependent Claims (12, 13)
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Specification