Semiconductor integrated circuit device
First Claim
1. A semiconductor integrated circuit device for use in a wireless communication mobile terminal device, comprising:
- a protective circuit which is provided a high frequency signal received by an antenna of the wireless communication mobile terminal device;
an amplifying transistor which is coupled to the protective circuit and which amplifies the high frequency signal and outputs an amplified high frequency signal; and
a reception mixer which converts a frequency of the amplified high frequency signal into a lower frequency,wherein the protective circuit, the amplifying transistor and the reception mixer are formed on a same semiconductor chip of the semiconductor integrated circuit device,wherein the protective circuit prevents electrostatic breakdown of the semiconductor chip,wherein the semiconductor chip includes a first voltage line which is supplied with a first voltage and a second voltage line which is supplied with a second voltage lower than the first voltage,wherein the protective circuit is arranged between the first voltage line and the second voltage line and includes a signal node which receives the high frequency signal, a first protection unit which allows an electric current flow from the first voltage line to the signal node and a second protection unit which allows an electric current flow from the signal node to the second voltage line,wherein the first protection unit includes a plurality of first diodes which are connected in series and are arranged between the first voltage line and the signal node, andwherein the second protection unit includes a plurality of second diodes which are connected in series and are arranged between the signal node and the second voltage line.
2 Assignments
0 Petitions
Accused Products
Abstract
Into an internal circuit to operate in a high-frequency band, there is incorporated a protective circuit of a multistage connection which is constructed to include a plurality of diode-connected transistors having a low parasitic capacity and free from a malfunction even when an input signal higher than the power supply voltage is applied. Into an internal circuit to operate in a low-frequency band, there is incorporated a protective circuit which is constructed to include one diode-connected transistor. The protective circuits include two lines of protective circuit, in which the directions of electric currents are so reversed as to protect the internal circuits against positive/negative static electricities.
89 Citations
12 Claims
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1. A semiconductor integrated circuit device for use in a wireless communication mobile terminal device, comprising:
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a protective circuit which is provided a high frequency signal received by an antenna of the wireless communication mobile terminal device; an amplifying transistor which is coupled to the protective circuit and which amplifies the high frequency signal and outputs an amplified high frequency signal; and a reception mixer which converts a frequency of the amplified high frequency signal into a lower frequency, wherein the protective circuit, the amplifying transistor and the reception mixer are formed on a same semiconductor chip of the semiconductor integrated circuit device, wherein the protective circuit prevents electrostatic breakdown of the semiconductor chip, wherein the semiconductor chip includes a first voltage line which is supplied with a first voltage and a second voltage line which is supplied with a second voltage lower than the first voltage, wherein the protective circuit is arranged between the first voltage line and the second voltage line and includes a signal node which receives the high frequency signal, a first protection unit which allows an electric current flow from the first voltage line to the signal node and a second protection unit which allows an electric current flow from the signal node to the second voltage line, wherein the first protection unit includes a plurality of first diodes which are connected in series and are arranged between the first voltage line and the signal node, and wherein the second protection unit includes a plurality of second diodes which are connected in series and are arranged between the signal node and the second voltage line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification