Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A delay measurement system and a measurement method are provided. The delay measurement system includes a delay control device and a comparator. The delay control device is configured to generate a second signal in response to a first signal, wherein a rising edge of the second signal delays a first delay time with respect to a rising edge of the first signal, and the first delay time is controlled in response to an output signal of a comparator. The comparator is configured to compare the first delay time with a second delay time and output the output signal, wherein a rising edge of a third signal delays the second delay time with respect to the rising edge of the first signal, and the third signal is generated by a device under test (DUT) in response to the first signal.

Abstract: An envelope-tracking power supply modulator (ETSM) supplies power to a radio frequency power amplifier (RFPA) of a radio frequency (RF) circuit according to a baseband envelope signal. The ETSM includes a linear amplifier, a capacitor, a single inductor multiple output (SIMO) switch-mode converter, and a controller. The linear amplifier receives the baseband envelope signal, and has its output terminal coupled to a power input of the RFPA. One terminal of the capacitor is coupled to a reference voltage, and the other terminal is coupled to a power input of the linear amplifier. The SIMO switch-mode converter includes two output terminals. One of the output terminals is coupled to the capacitor and the power input of the linear amplifier, and the other of the output terminals is coupled to the output terminal of the linear amplifier and the power input of the RFPA. The controller controls the SUMO switch-mode converter.

Abstract: An envelope-tracking power supply modulator (ETSM) supplies power to a radio frequency power amplifier (RFPA) of a radio frequency (RF) circuit according to a baseband envelope signal. The ETSM includes a linear amplifier, a capacitor, a single inductor multiple output (SIMO) switch-mode converter, and a controller. The linear amplifier receives the baseband envelope signal, and has its output terminal coupled to a power input of the RFPA. One terminal of the capacitor is coupled to a reference voltage, and the other terminal is coupled to a power input of the linear amplifier. The SIMO switch-mode converter includes two output terminals. One of the output terminals is coupled to the capacitor and the power input of the linear amplifier, and the other of the output terminals is coupled to the output terminal of the linear amplifier and the power input of the RFPA. The controller controls the SUMO switch-mode converter.