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US 8,027,594 B2Granted
Receiving apparatus and electronic device using the same
AssigneeRohm Co., Ltd.
InventorShinji Yano
Life of this patent
Estimating the term…
Abstract
A photodiode receives an infrared signal transmitted from a transmitter. A current distributing unit outputs a detection current Id output from the photodiode as a first detection current Id1 and a second detection current Id2 to a subsequent first current-to-voltage conversion amplifier and a subsequent second current-to-voltage conversion amplifier respectively. The first and second current-to-voltage conversion amplifiers convert the detection currents into voltages with current-to-voltage conversion gains g1 and g2. The current-to-voltage conversion gains g1 and g2 of the first and second current-to-voltage conversion amplifiers are set such that ranges of signal levels in which the distributed detection currents Id1 and Id2 can significantly be amplified differ from each other.
Claims21
A receiver comprising:
- a sensitive element which receives a signal from the outside to convert the signal into an electric signal and outputs the electric signal;
- an amplifier which amplifies the electric signal output from the sensitive element;
- a distributing unit which distributes the electric signal amplified by the amplifier into a plurality of paths;
- and
- an adder which adds the plurality of electric signals distributed by the distributing unit;
- wherein the adder comprises a differential amplifier, the differential amplifier comprising:
- a plurality of differential pairs;
- a load which is commonly provided for the plurality of differential pairs;
- and
- a plurality of current sources which supply bias currents to the plurality of differential pairs respectively, and
- the adder inputs the plurality of electric signals distributed by the distributing unit, to the plurality of differential pairs respectively.
8 more elements
An electronic equipment which is remotely controlled from the outside using an infrared signal, the electronic equipment comprising:
- a receiver which receives a pulse-modulated infrared signal which is incident from the outside;
- a demodulation unit which demodulates the infrared signal received by the receiver;
- and
- a control unit which controls operation of the electronic equipment based on the infrared signal demodulated by the demodulation unit,
- the receiver comprising:
- a sensitive element which receives a signal from the outside to convert the signal into a detection current and outputs the detection current;
- a distributing unit which distributes the detection current output from the sensitive element in a form of a plurality of detection currents;
- a plurality of amplifiers respectively provided for the plurality of detection currents, each amplifier being adapted to convert the corresponding detection current distributed by the distributing unit into a detection voltage, and the amplifiers having different current-to-voltage conversion gains;
- and
- an adder which adds the plurality of detection voltages output from the plurality of amplifiers.
7 more elements
An electronic equipment which is remotely controlled from the outside using an infrared signal, the electronic equipment comprising:
- a receiver which receives a pulse-modulated infrared signal which is incident from the outside;
- a demodulation unit which demodulates the infrared signal received by the receiver;
- and
- a control unit which controls operation of the electronic equipment based on the infrared signal demodulated by the demodulation unit;
- the receiver comprising:
- a plurality of sensitive elements which convert input signals into electric signals to output the electric signals;
- a plurality of amplifiers which amplify the plurality of electric signals output from the plurality of sensitive elements;
- and
- an adder which adds the plurality of electric signals amplified by the plurality of amplifiers;
- wherein gains of the amplifiers are set so as to be lowered in steps as a level of the electric signal output from the sensitive element is increased, and
- sizes of the plurality of sensitive elements are set such that the level of the electric signal is included in a range where the amplifier which amplifies the electric signal has a significant gain, the electric signal being output when the maximum signal regarded as an input is input.
8 more elements
An electronic equipment which is remotely controlled from the outside using an infrared signal, the electronic equipment comprising:
- a receiver which receives a pulse-modulated infrared signal which is incident from the outside;
- a demodulation unit which demodulates the infrared signal received by the receiver;
- and
- a control unit which controls operation of the electronic equipment based on the infrared signal demodulated by the demodulation unit;
- the receiver comprising:
- a sensitive element which receives a signal from the outside to convert the signal into an electric signal and outputs the electric signal;
- an amplifier which amplifies the electric signal output from the sensitive element;
- a distributing unit which distributes the electric signal amplified by the amplifier into a plurality of paths;
- and
- an adder which adds the plurality of electric signals distributed by the distributing unit;
- wherein the adder comprises a differential amplifier, the differential amplifier comprising:
- a plurality of differential pairs;
- a load that is commonly provided for the plurality of differential pairs;
- and
- a plurality of current sources which supply bias currents to the plurality of differential pairs respectively;
- wherein the adder inputs the plurality of electric signals distributed by the distributing unit, to the plurality of differential pairs respectively.
13 more elements
A receiver comprising:
- a sensitive element which receives a signal from the outside to convert the signal into an electric signal and outputs the electric signal;
- an amplifier which amplifies the electric signal output from the sensitive element;
- a distributing unit which distributes the electric signal amplified by the amplifier into a plurality of paths;
- and
- an adder which adds the plurality of electric signals distributed by the distributing unit;
- wherein the amplifier comprises:
- an operational amplifier in which a reference voltage is input to a non-inverting input terminal of the operational amplifier and the electric signal output from the sensitive element is input to an inverting input terminal of the operational amplifier;
- a first resistor provided between an output terminal of the operational amplifier and the inverting input terminal of the operational amplifier;
- a diode having an anode thereof connected to the output terminal of the operational amplifier;
- and
- a second resistor provided between the cathode of the diode and the inverting input terminal of the operational amplifier.
8 more elements
Dependencies are inferred from the claim text.