US 2003/0119464 A1 · Radio receiver and radio receiving method

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.

Claims11

Dependent claims

A radio receiver comprising:

a low noise amplifier which amplifies a radio signal;
a quadrature demodulator which directly demodulates the radio signal amplified into a baseband signal;
a variable gain amplifier which amplifies the baseband signal;
an executing unit configured to execute feedback control on the baseband signal amplified;
and
a gain controller which controls a gain of the low noise amplifier, the gain controller comprising:
a signal intensity detector which detects an intensity of the baseband signal amplified;
a gain selector which selects a desired preset gain from a plurality of preset gains which are set for the low noise amplifier, based on the intensity detected;
a timing controller which controls timing of switching the gain to the desired preset gain selected;
and
a gain control signal output unit configured to output a gain control signal to the low noise amplifier at a time-interval according to the timing controlled.

8 more elements

Dependencies are inferred from the claim text.

Radio receiver and radio receiving method

Life of this patent

Radio receiver and radio receiving method

Life of this patent

Abstract

Claims11