Gain control circuit, communication device, electronic appliance, and gain control method
First Claim
1. A gain control circuit comprising:
- a first amplifier for amplifying an input signal; and
a signal determination unit for determining the input signal to be input to the first amplifier, and controlling an amplification factor of the first amplifier based on a determination result,wherein a control loop is provided at a following stage of the first amplifier, for detecting a level of an output signal of the first amplifier and controlling the amplification factor of the first amplifier based on the detected level of the output signal.
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Accused Products
Abstract
The present technology relates to a gain control circuit, a communication device, an electronic appliance, and a gain control method which aim to provide a technology capable of suppressing intermodulation distortion. The gain control circuit includes a first amplifier for amplifying an input signal, and a signal determination unit for determining an input signal to be input to the first amplifier, and controlling an amplification factor of the first amplifier based on the determination result. The communication device includes a first amplifier for amplifying a received signal, a receiving unit for performing a receiving process based on a signal output from the first amplifier, and a signal determination unit for determining a received signal to be input to the first amplifier, and controlling the amplification factor of the first amplifier based on the determination result. In the gain control method, an input signal to be input to a first amplifier for amplifying an input signal is determined, and the amplification factor of the first amplifier is controlled by a feed forward system based on the determination result.
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Citations
16 Claims
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1. A gain control circuit comprising:
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a first amplifier for amplifying an input signal; and a signal determination unit for determining the input signal to be input to the first amplifier, and controlling an amplification factor of the first amplifier based on a determination result, wherein a control loop is provided at a following stage of the first amplifier, for detecting a level of an output signal of the first amplifier and controlling the amplification factor of the first amplifier based on the detected level of the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A communication device comprising:
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a first amplifier for amplifying a received signal; a receiving unit for performing a receiving process based on a signal output from the first amplifier; and a signal determination unit for determining the received signal to be input to the first amplifier, and controlling an amplification factor of the first amplifier based on a determination result, wherein the signal determination unit includes a second amplifier for amplifying the received signal input to the first amplifier, and a level detection unit for detecting a level of an output signal of the second amplifier, and wherein the amplification factor of the first amplifier and an amplification factor of the second amplifier are controlled with a relative relationship.
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12. An electronic appliance comprising:
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a first amplifier for amplifying an input signal; a signal processing unit for performing signal processing based on a signal output from the first amplifier; and a signal determination unit for determining the input signal to be input to the first amplifier, and controlling an amplification factor of the first amplifier based on a determination result, wherein the input signal includes a desired wave and an interfering wave, and wherein the amplification factor of the first amplifier is controlled with a fixed difference in levels of the desired wave and the interfering wave.
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13. An electronic appliance comprising:
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a first amplifier for amplifying a received signal; a receiving unit for performing a receiving process based on a signal output from the first amplifier; and a signal determination unit for determining the received signal to be input to the first amplifier, and controlling an amplification factor of the first amplifier based on a determination result, wherein the input signal includes a desired wave and an interfering wave, and wherein the amplification factor of the first amplifier is controlled with a fixed difference in levels of the desired wave and the interfering wave. - View Dependent Claims (14)
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15. A gain control method comprising:
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determining an input signal to be input to a first amplifier for amplifying the input signal, and controlling an amplification factor of the first amplifier by a feed forward system based on a determination result, wherein the input signal includes a desired wave and an interfering wave, and wherein the amplification factor of the first amplifier is controlled with a fixed difference in levels of the desired wave and the interfering wave.
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Specification