Radio receiver and radio signal processing method
First Claim
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1. A radio receiver comprising:
- a first amplifier to amplify a received radio signal;
a demodulation circuit line comprising a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and to generate a baseband signal, a second amplifier to amplify the baseband signal, and a demodulator to demodulate the baseband signal amplified by said second amplifier; and
a gain controller to control timing of a change in a gain of said second amplifier, in case that the gain of said first amplifier and the gain of said second amplifier are changed, on the basis of a gain of said first amplifier before and after the change.
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Abstract
A radio receiver comprises a first amplifier to amplify a received radio signal; a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and thereby generate a baseband signal; a second amplifier to amplify the baseband signal; a demodulator to demodulate the baseband signal amplified by said second amplifier; and a gain controller to control timing of a change in a gain of said second amplifier, in case that changing the gain of said first amplifier and the gain of said second amplifier, on the basis of a gain of said first amplifier before and after the change.
21 Citations
20 Claims
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1. A radio receiver comprising:
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a first amplifier to amplify a received radio signal;
a demodulation circuit line comprising a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and to generate a baseband signal, a second amplifier to amplify the baseband signal, and a demodulator to demodulate the baseband signal amplified by said second amplifier; and
a gain controller to control timing of a change in a gain of said second amplifier, in case that the gain of said first amplifier and the gain of said second amplifier are changed, on the basis of a gain of said first amplifier before and after the change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio receiver comprising:
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a first amplifier to amplify a received radio signal;
a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and to generate a baseband signal;
a second amplifier to amplify, after changing a gain of said first amplifier, the baseband signal with a gain based on a gain of said first amplifier obtained before and after the change; and
a demodulator to demodulate the baseband signal amplified by said second amplifier. - View Dependent Claims (14, 15)
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16. A radio receiver comprising:
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a first amplifier to amplify a received radio signal;
a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and to generate a baseband signal;
a second amplifier to amplify the baseband signal;
a demodulator to demodulate the baseband signal amplified by said second amplifier; and
a gain controller to delay timing of a change in a gain of said second amplifier as compared with timing of a change in a gain of said first amplifier, in case that the gain of said first amplifier is changed from a high gain to a low gain and the gain of said second amplifier is changed from a low gain to a high gain. - View Dependent Claims (17)
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18. A radio signal processing method comprising:
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receiving a radio signal;
amplifying the radio signal;
demodulating the amplified radio signal to a baseband signal;
amplifying the baseband signal;
demodulating the amplified baseband signal;
determining timing of a change in a gain of said first amplifier and a gain of said second amplifier, in case that the gain of said first amplifier and the gain of said second amplifier are changed, on the basis of the gain of said first amplifier obtained before and after the change; and
changing the gain of said first amplifier and the gain of said second amplifier in accordance with the determined timing. - View Dependent Claims (19, 20)
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Specification