Radio receiver and radio receiving method
First Claim
1. A radio receiver, comprising:
- a low noise amplifier which amplifies a radio signal;
a quadrature demodulator which demodulates the amplified radio signal into a baseband signal;
a variable gain amplifier which amplifies the baseband signal;
an offset canceller configured to cancel an offset of the baseband signal according to the amplified baseband signal; and
a signal intensity detector which detects an intensity of the amplified baseband signal;
a gain selector which selects a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity;
a monitoring unit configured to monitor the selection of the gain selector in order to obtain a time interval between switching of a gain of the low noise amplifier;
a comparator which compares a preset time-interval with the time interval; and
a gain controller configured to change a gain of the variable gain amplifier when the time interval is longer than the preset time-interval.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio receiver comprises an LNA which amplifies An RF signal, a quadrature demodulator which directly demodulates the amplified RF signal into a B/B signal, using a LO signal, a VGA which amplifies the B/B signal, a DC offset canceller which executes feedback control on the amplified B/B signal, and a gain controller which controls at least the gain of the LNA, the gain controller including a signal intensity detector which detects the intensity of the amplified B/B signal, a gain selector which selects a desired one of preset gains on the basis of the detected intensity, a timing controller which controls timing of switching to the selected desired gain, and a gain control signal generator which changes, in accordance with the controlled timing, the interval at which an LNA gain control signal is generated.
10 Citations
2 Claims
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1. A radio receiver, comprising:
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a low noise amplifier which amplifies a radio signal; a quadrature demodulator which demodulates the amplified radio signal into a baseband signal; a variable gain amplifier which amplifies the baseband signal; an offset canceller configured to cancel an offset of the baseband signal according to the amplified baseband signal; and a signal intensity detector which detects an intensity of the amplified baseband signal; a gain selector which selects a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity; a monitoring unit configured to monitor the selection of the gain selector in order to obtain a time interval between switching of a gain of the low noise amplifier; a comparator which compares a preset time-interval with the time interval; and a gain controller configured to change a gain of the variable gain amplifier when the time interval is longer than the preset time-interval.
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2. A radio receiving method comprising:
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preparing a low noise amplifier which amplifies a radio signal; demodulating the amplified radio signal into a baseband signal; preparing a variable gain amplifier which amplifies the baseband signal; canceling an offset of the baseband signal according to the amplified baseband signal; detecting an intensity of the amplified baseband signal; selecting a preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the detected intensity; monitoring the selection of the preset gain in order to obtain a time interval between switching of a gain of the low noise amplifier; comparing a preset time-interval with the time interval; and changing a gain of the variable gain amplifier when the time interval is longer than the preset time-interval.
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Specification