Semiconductor integrated circuit device and wireless communication system
First Claim
1. A semiconductor integrated circuit device comprising:
- a modulation circuit for modulating multiplexed signals to be transmitted; and
a variable gain amplifying circuit for amplifying the modulated transmitting signals depending on first control information to indicate an output level, wherein said variable gain amplifying circuit is capable of changing the operation current depending on second control information indicating the number of multiplexes of the multiplexed signals to be transmitted and is controlled to increase said operation current when the number of multiplexes is large or to decrease said operation current when the number of multiplexes is small.
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Accused Products
Abstract
The dynamic range is changed by switching a current applied to an amplifying circuit to obtain the minimum ICP required to keep linearity with the number of multiplexes even when the number of multiplexes of data is changed by switching the operation current of the amplifying circuits of the transmission system and also supplying the information about number of multiplexes of data to be transmitted to the amplifying circuits of the transmission system from the baseband circuit. Thereby, the signal can be transmitted without distortion even when the number of multiplexes increases and the current of the amplifying circuit may be reduced when the number of multiplexes is small in order to reduce the current consumption in the communication semiconductor integrated circuit device which can form a wireless communication system of the code division multiplex system such as W-CDMA system.
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Citations
13 Claims
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1. A semiconductor integrated circuit device comprising:
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a modulation circuit for modulating multiplexed signals to be transmitted; and
a variable gain amplifying circuit for amplifying the modulated transmitting signals depending on first control information to indicate an output level, wherein said variable gain amplifying circuit is capable of changing the operation current depending on second control information indicating the number of multiplexes of the multiplexed signals to be transmitted and is controlled to increase said operation current when the number of multiplexes is large or to decrease said operation current when the number of multiplexes is small. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electronic component for communication comprising:
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a gain controllable power amplifying circuit for outputting the amplified transmission signal; and
a bias circuit for giving bias to said power amplifying circuit depending on first control information indicating an output level, wherein said power amplifying circuit is capable of changing the operation current depending on second control information indicating a number of multiplexes of multiplexed signals to be transmitted and is controlled to increase said operation current when the number of multiplexes is large or to decrease said operation current when the number of multiplexes is small. - View Dependent Claims (8, 9, 10, 11)
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12. A wireless communication system comprising:
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a communication semiconductor integrated circuit device including;
a modulation circuit for realizing modulation for multiplexed information pieces to be transmitted; and
a variable gain amplifying circuit for amplifying said modulated transmission signal depending on first control information indicating an output level, wherein the variable gain amplifying circuit is capable of changing the operation current depending on the second control information indicating a number of multiplexes of the transmission signal and is controlled to increase said operation current when the number of multiplexes is large or to decrease said operation current when the number of multiplexes is small;
a baseband circuit for generating and giving the I, Q signals to be modulated by said communication semiconductor integrated circuit device; and
a communication electronic component including a gain controllable power amplifying circuit for amplifying the signal outputted from said communication semiconductor integrated circuit device, and a bias circuit forgiving bias to said power amplifying circuit depending on said first control information, said first control information and said second control information being given to said communication semiconductor integrated circuit device from said baseband circuit. - View Dependent Claims (13)
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Specification