US 6,714,602 B1Granted

Demodulator and receiver

AssigneesSony Corporation, Sony International (Europe) GmbH

InventorsAbe Masayoshi, Yukitoshi Sanada, Dragan Krupezvic, Veselin Brankovic

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Abstract

A high performance demodulator, capable of realizing further broadband characteristics, low distortion, a low power consumption, and small fluctuation in characteristics against fluctuations in temperature and fluctuations over time compared with a conventional multi-port demodulators, wherein a two-terminal first phase shifter 1004, three-terminal second branch circuit 1002, two-terminal second phase shifter 1005, and three-terminal third branch circuit 1003 are connected in series between a first signal input terminal TINSr for a reception signal and a second signal input terminal TINSlo for a local signal, a third terminal c of a first branch circuit 1001 is connected to a first power detection circuit 1006, a third terminal c of the second branch circuit 1002 is connected to a second power detection circuit 1007, and a third terminal c of the third branch circuit 1003 is connected to a third power detection circuit 1008, and comprising an N-port signal-IQ signal conversion circuit 1009 for receiving output signals P1, P2, and P3 of the first to third power detection circuits 1006 to 1008 and converting the same to demodulation signals, that is, in-phase signal I(t) and a quadrature signal Q(t), by a computation circuit.

Claims61

Dependent claims

A demodulator comprising:

a first signal input terminal for receiving as an input a reception signal;
a second signal input terminal for receiving as an input a local signal;
a first branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the first signal input terminal, branching the reception signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal;
a second branch circuit having a first terminal, a second terminal, and a third terminal, branching a signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal;
a third branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the second signal input terminal, branching the local signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal;
a first phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the first branch circuit and the second terminal is connected to the first terminal of the second branch circuit, and shifting the phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal;
a second phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the second branch circuit and the second terminal is connected to the second terminal of the third branch circuit, and shifting the phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal;
a first signal level detection circuit having an input terminal connected to the third terminal of the first branch circuit and detecting a level of a signal output from the third terminal of the first branch circuit;
a second signal level detection circuit having an input terminal connected to the third terminal of the second branch circuit and detecting a level of a signal output from the third terminal of the second branch circuit;
and
a third signal level detection circuit having an input terminal connected to the third terminal of the third branch circuit and detecting a level of a signal output from the third terminal of the third branch circuit.

8 more elements

A demodulator comprising:

a first signal input terminal for receiving as an input a reception signal;
a second signal input terminal for receiving as an input a local signal;
a first branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the first signal input terminal, branching the reception signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal;
a second branch circuit having a first terminal, a second terminal, and a third terminal, branching a signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to a first terminal and a signal to the third terminal;
a third branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the second signal input terminal, branching the local signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal;
a first phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the first branch circuit and the second terminal is connected to the first terminal of the second branch circuit, and shifting the phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal;
a second phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the second branch circuit and the second terminal is connected to the second terminal of the third branch circuit, and shifting the phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal;
a first signal level detection circuit having an input terminal connected to the third terminal of the first branch circuit and detecting a level of a signal output from the third terminal of the first branch circuit;
a second signal level detection circuit having an input terminal connected to the third terminal of the second branch circuit and detecting a level of a signal output from the third terminal of the second branch circuit;
a third signal level detection circuit having an input terminal connected to the third terminal of the third branch circuit and detecting a level of a signal output from the third terminal of the third branch circuit;
a first analog/digital converter for converting an output signal of the first signal level detection circuit from an analog signal to a digital signal;
a second analog/digital converter for converting an output signal of the second signal level detection circuit from an analog signal to a digital signal;
a third analog/digital converter for converting an output signal of the third signal level detection circuit from an analog signal to a digital signal;
and
a conversion circuit for converting an output signal of the first analog/digital converter, an output signal of the second analog/digital converter, and an output signal of the third analog/digital converter to a plurality of signal components contained in a reception signal.

12 more elements

A receiver comprising:

a demodulator comprising a first signal input terminal for receiving as an input a reception signal, a second signal input terminal for receiving as an input a local signal, a first branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the first signal input terminal, branching the reception signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal, a second branch circuit having a first terminal, a second terminal, and a third terminal, branching a signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to a first terminal and a signal to the third terminal, a third branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the second signal input terminal, branching the local signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal, a first phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the first branch circuit and the second terminal is connected to the first terminal of the second branch circuit, shifting phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal, a second phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the second branch circuit and the second terminal is connected to the second terminal of the third branch circuit, and shifting phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal, a first signal level detection circuit having an input terminal connected to the third terminal of the first branch circuit and detecting a level of a signal output from the third terminal of the first branch circuit, a second signal level detection circuit having an input terminal connected to the third terminal of the second branch circuit and detecting a level of a signal output from the third terminal of the second branch circuit, a third signal level detection circuit having an input terminal connected to the third terminal of the third branch circuit and detecting a level of a signal output from the third terminal of the third branch circuit, and a conversion circuit for converting an output signal of the first signal level detection circuit, an output signal of the second signal level detection circuit, and an output signal of the third signal level detection circuit to a plurality of signal components contained in a reception signal;
a gain control circuit for adjusting a level of a reception signal to a desired level and supplying the signal to the first signal input terminal of the demodulator;
and
a local signal generation circuit for generating a local signal at a desired oscillation frequency and supplying the signal to the second signal input terminal of the demodulator.

1 more element

A receiver comprising:

a demodulator comprising a first signal input terminal for receiving as an input a reception signal, a second signal input terminal for receiving as an input a local signal, a first branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the first signal input terminal, branching the reception signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal, a second branch circuit having a first terminal, a second terminal, and a third terminal, wherein a signal input to the first terminal is branched to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to a first terminal and a signal to the third terminal, a third branch circuit having a first terminal, a second terminal, and a third terminal, wherein the first terminal is connected to the second signal input terminal, branching the local signal input to the first terminal to a signal to the second terminal and a signal to the third terminal, and branching a signal input to the second terminal to a signal to the first terminal and a signal to the third terminal, a first phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the first branch circuit, and the second terminal is connected to the first terminal of the second branch circuit, and shifting the phases of a signal input from the first terminal and a signal input from the second terminal and output them from the second terminal and the first terminal, a second phase shifter having a first terminal and a second terminal, wherein the first terminal is connected to the second terminal of the second branch circuit, and the second terminal is connected to the second terminal of the third branch circuit, and shifting the phases of a signal input from the first terminal and a signal input from the second terminal and outputting them from the second terminal and the first terminal, a first signal level detection circuit having an input terminal connected to the third terminal of the first branch circuit and detecting a level of a signal output from the third terminal of the first branch circuit, a second signal level detection circuit having an input terminal connected to the third terminal of the second branch circuit and detecting a level of a signal output from the third terminal of the second branch circuit, a third signal level detection circuit having an input terminal connected to the third terminal of the third branch circuit and detecting a level of a signal output from the third terminal of the third branch circuit, a first analog/digital converter for converting an output signal of the first signal level detection circuit from an analog signal to a digital signal, a second analog/digital converter for converting an output signal of the second signal level detection circuit from an analog signal to a digital signal, a third analog/digital converter for converting an output signal of the third signal level detection circuit from an analog signal to a digital signal, and a conversion circuit for converting an output signal of the first analog/digital converter, an output signal of the second analog/digital converter, and an output signal of the third analog/digital converter to a plurality of signal components contained in a reception signal;
a gain control circuit for adjusting a level of a reception signal to a desired level and supplying it to the first signal input terminal of the demodulator;
and
a local signal generation circuit for generating a local signal at a desired oscillation frequency and supplying it to the second signal input terminal of the demodulator.

1 more element

Dependencies are inferred from the claim text.