In accordance with a first aspect, a communication device is provided, comprising: a transmitter configured to transmit one or more radio frequency signal pulses to an external communication device; a receiver configured to receive one or more response signals in response to the radio frequency signal pulses transmitted by the transmitter; a signal analyzer configured to detect one or more characteristics of the response signals, to compare the detected characteristics with predefined reference characteristics and to generate an output indicative of a result of comparing the detected characteristics with the predefined reference characteristics; a processing unit configured to determine at least one category to which the external communication device belongs based on the output generated by the signal analyzer. In accordance with a second aspect, a corresponding method of operating a communication device is conceived. In accordance with a third aspect, a corresponding computer program is provided.

In accordance with a first aspect, a communication device is provided, comprising: a transmitter configured to transmit one or more radio frequency signal pulses to an external communication device; a receiver configured to receive one or more response signals in response to the radio frequency signal pulses transmitted by the transmitter; a signal analyzer configured to detect one or more characteristics of the response signals, to compare the detected characteristics with predefined reference characteristics and to generate an output indicative of a result of comparing the detected characteristics with the predefined reference characteristics; a processing unit configured to determine at least one category to which the external communication device belongs based on the output generated by the signal analyzer. In accordance with a second aspect, a corresponding method of operating a communication device is conceived. In accordance with a third aspect, a corresponding computer program is provided.

A communication device according to an embodiment includes an oscillator, a first signal generation circuit, a first insulation element, a first receiving circuit, and a first output circuit. The oscillator is configured to output a first carrier signal when at least one of a plurality of input signals that are externally input is at a first logic level. The first carrier signal and a first input signal among the input signals are input to the first signal generation circuit. The first signal generation circuit is configured to generate a first signal when the first input signal changes from a second logic level to the first logic level, output a first modulated signal based on the first signal, and thereafter output a second modulated signal based on the first carrier signal.

A communication device according to an embodiment includes an oscillator, a first signal generation circuit, a first insulation element, a first receiving circuit, and a first output circuit. The oscillator is configured to output a first carrier signal when at least one of a plurality of input signals that are externally input is at a first logic level. The first carrier signal and a first input signal among the input signals are input to the first signal generation circuit. The first signal generation circuit is configured to generate a first signal when the first input signal changes from a second logic level to the first logic level, output a first modulated signal based on the first signal, and thereafter output a second modulated signal based on the first carrier signal.

An embodiment integrated electronic device comprises a mixer module including a voltage/current transconductor stage including first transistors and connected to a mixing stage including second transistors, wherein the mixing stage includes a resistive degeneration circuit connected to the sources of the second transistors and a calibration input connected to the gates of the second transistors and intended to receive an adjustable calibration voltage, and the sources of the first transistors are directly connected to a cold power supply point.

In accordance with a first aspect, a communication device is provided, comprising: a transmitter configured to transmit one or more radio frequency signal pulses to an external communication device; a receiver configured to receive one or more response signals in response to the radio frequency signal pulses transmitted by the transmitter; a signal analyzer configured to detect one or more characteristics of the response signals, to compare the detected characteristics with predefined reference characteristics and to generate an output indicative of a result of comparing the detected characteristics with the predefined reference characteristics; a processing unit configured to determine at least one category to which the external communication device belongs based on the output generated by the signal analyzer. In accordance with a second aspect, a corresponding method of operating a communication device is conceived. In accordance with a third aspect, a corresponding computer program is provided.

In accordance with a first aspect, a communication device is provided, comprising: a transmitter configured to transmit one or more radio frequency signal pulses to an external communication device; a receiver configured to receive one or more response signals in response to the radio frequency signal pulses transmitted by the transmitter; a signal analyzer configured to detect one or more characteristics of the response signals, to compare the detected characteristics with predefined reference characteristics and to generate an output indicative of a result of comparing the detected characteristics with the predefined reference characteristics; a processing unit configured to determine at least one category to which the external communication device belongs based on the output generated by the signal analyzer. In accordance with a second aspect, a corresponding method of operating a communication device is conceived. In accordance with a third aspect, a corresponding computer program is provided.

A frequency tripler circuit includes an amplifier to receive a balanced input signal at an input frequency and outputs a balanced signal at a second harmonic of the input frequency. The frequency tripler circuit includes a passive double balanced mixer coupled to an output of the amplifier to receive the balanced signal at the second harmonic and the balanced input signal to generate an output balanced signal having a frequency triple the input frequency.

A frequency tripler circuit includes an amplifier to receive a balanced input signal at an input frequency and outputs a balanced signal at a second harmonic of the input frequency. The frequency tripler circuit includes a passive double balanced mixer coupled to an output of the amplifier to receive the balanced signal at the second harmonic and the balanced input signal to generate an output balanced signal having a frequency triple the input frequency.

In embodiments, an electronic device may include a housing having an inner space, a printed circuit board (PCB) disposed in the inner space of the housing, a first antenna structure disposed at a position spaced apart from the PCB, and transmitting and/or receiving a radio signal in a first frequency band, at least one second antenna structure disposed at a position spaced apart from the PCB, and transmitting and/or receiving a radio signal in a second frequency band different from the first frequency band, and a flexible substrate electrically connecting the PCB and the first antenna structure. The flexible substrate may include a first connecting portion electrically connected to the PCB, an interconnecting portion extended from the first connecting portion to the first antenna structure, at least one branch portion branched from at least a part of the interconnecting portion, and extended to the at least one second antenna structure, at least one first conductive path disposed in the interconnecting portion, and electrically connecting the first connecting portion and the first antenna structure, and at least one second conductive path disposed in the interconnecting portion and the at least one branch portion, and electrically connecting the first connecting portion and the at least one second antenna structure.