Abstract: A method of calibrating a high frequency signal measurement system is described. The measurement system is in the form of a network analyzer (6) and has first and second phase-locked signal sources (SS1 & SS2) and at least two measurement receivers (18a, 18b). A phase meter (26) is provided. A reference signal (F0) is outputted at a first frequency from the first signal source (SS1). The second signal source (SS2) steps through a multiplicity of different test frequencies (nF0), being phase-locked with the reference signal (F0), which are applied in turn to a part of the measurement system. Measurements are taken, via the two measurement receivers (18a, 18b), of characteristics of the resulting signal at a measurement plane. The absolute phase of the signal at the measurement plane is also measured with the phase meter (26). Calibration data is generated which relates the characteristics of the signals as measured by the measurement system (6) and the absolute phase as measured with the phase meter (26).

Abstract: A method of calibrating a high frequency signal measurement system is described. The measurement system is in the form of a network analyser (6) and has first and second phase-locked signal sources (SS1 & SS2) and at least two measurement receivers (18a, 18b). A phase meter (26) is provided. A reference signal (F0) is outputted at a first frequency from the first signal source (SS1). The second signal source (SS2) steps through a multiplicity of different test frequencies (nF0), being phase-locked with the reference signal (F0), which are applied in turn to a part of the measurement system. Measurements are taken, via the two measurement receivers (18a, 18b), of characteristics of the resulting signal at a measurement plane. The absolute phase of the signal at the measurement plane is also measured with the phase meter (26). Calibration data is generated which relates the characteristics of the signals as measured by the measurement system (6) and the absolute phase as measured with the phase meter (26).

Abstract: A universal platform may be used to create a family of LED light bulbs with lower costs. One universal platform includes a lamp base, a lamp holder, and a driver. Different upper bulb portions may be assembled on this universal platform. An alternate universal platform include a lamp base, a lamp holder, a heat sink, a driver shell, a driver, a PCB, and one or more LEDs. Different diffusers may be connected to this platform to produce different bulb designs. The bulbs may include an optional diffuser for producing omnidirectional light.

Abstract: An LED bulb includes: a circuit board having opposite first and second surfaces; a plurality of LEDs disposed on the first surface; and a heat dissipating structure having a heat dissipating board, wherein the heat dissipating board has opposite third and fourth surfaces, the third surface is attached to the second surface of the circuit board, and a plurality of heat dissipating bumps is disposed on the fourth surface and gradually decreases in length from the center toward the periphery of the fourth surface to thereby facilitate air convection around the heat dissipating bumps, thus improving the overall heat dissipating efficiency so as to increase the light emitting efficiency and lifetime of the LED bulb.

Abstract: An analyser for measuring the response of an electronic device (DUT 206) to an RF input signal from a signal generator 240a is described. An active load pull circuit 201 is connected to the DUT 206, which receives an output signal from the DUT 206 and then feeds a modified signal back to the DUT 206. The signal is modified by a signal processing circuit 237 in view of input signals x, y to control the magnitude gain and phase change effected by the feedback circuit 237. Thus, positive feedback loops are avoided and better control of the analyser is permitted. A network analyser, or other signal measuring device 242, logs the waveforms (from which s-parameters derived) observed at ports of the DUT 206, thereby allowing the behaviour of the DUT 206 under various load conditions to be analysed.

Abstract: An analyzer for measuring the response of an electronic device (DUT 206) to an RF input signal from a signal generator (240a) is described. An active load pull circuit (201) is connected to the DUT 206, which receives an output signal from the DUT 206 and then feeds a modified signal back to the DUT 206. The signal is modified by a signal processing circuit (237) in view of input signals x, y to control the magnitude gain and phase change effected by the feedback circuit (237). Thus, positive feedback loops are avoided and better control of the analyzer is permitted. A network analyzer, or other signal measuring device (242), logs the waveforms (from which s-parameters derived) observed at ports of the DUT 206, thereby allowing the behavior of the DUT 206 under various load conditions to be analyzed.

Abstract: An underwater housing includes a housing body for containing an electronic device, a seal cap for sealing a rear end opening of the housing body, and a spacer member for dividing a space between the housing body and the seal cap into a cable chamber and an accommodating chamber. The seal cap includes an annular front cap element connected fixedly and sealingly to the housing body, and a rear cap element disposed fixedly and fittingly within the rear end of the front cap element. The rear cap element has a hole permitting an electrical cable to sealingly extend therethrough. The spacer member includes a spacer body disposed sealingly in said seal cap, and a plurality of conductive terminals extending sealingly through the spacer body and interconnecting electrically the electronic device and the electrical cable.

Abstract: An underwater housing includes a housing body for containing an electronic device, a seal cap for sealing a rear end opening of the housing body, and a spacer member for dividing a space between the housing body and the seal cap into a cable chamber and an accommodating chamber. The seal cap includes an annular front cap element connected fixedly and sealingly to the housing body, and a rear cap element disposed fixedly and fittingly within the rear end of the front cap element. The rear cap element has a hole permitting an electrical cable to sealingly extend therethrough. The spacer member includes a spacer body disposed sealingly in said seal cap, and a plurality of conductive terminals extending sealingly through the spacer body and interconnecting electrically the electronic device and the electrical cable.

Abstract: A method of measuring the response of an electronic device to a high frequency input signal is performed with an analyzer (1).

Abstract: A method of measuring the response of an electronic device to a high frequency input signal is performed with an analyzer (1).