Via Labs, Inc.

Via Technologies, Inc.

Yu-Chung Wei

Wei-Yu Wang

Yinglien Cheng

A voltage comparator and an operation method thereof are provided. The voltage comparator includes an amplifying circuit, a reference current source, and a transient current source. A first input terminal and a second input terminal of the amplifying circuit respectively receive a first corresponding voltage corresponding to a target voltage and a reference voltage. The reference current source is coupled to the amplifying circuit to provide a reference current. The transient current source is coupled to the amplifying circuit to selectively provide a transient current. The transient current source detects a transition of a second corresponding voltage corresponding to the target voltage to dynamically adjust the transient current. Therefore, when a rapidly increasing voltage occurs in the target voltage, the transient current source may temporarily increase the current of the amplifying circuit, thereby accelerating the response speed of the amplifying circuit.

Voltage comparator and operation method thereof

A terminating resistor circuit of a USB port and an operation method thereof are provided. The terminating resistor circuit includes a terminating resistor, a terminating switch, and an energy storage control circuit. The terminating resistor and the terminating switch are connected in series between a configuration channel pin of the USB port and a first reference voltage, and the energy storage control circuit is coupled to a control end of the terminating switch. During a charging period in a configuration detection period, the energy storage control circuit stores charge from the configuration channel pin to obtain a stored electrical energy, and during a discharging period in the configuration detection period, the energy storage control circuit turns on the terminating switch by using the stored electrical energy.

Terminating resistor circuit of USB port and operation method thereof

A USB apparatus and an operation method thereof are provided. The USB apparatus includes a USB connector, a terminal resistor circuit, and an overvoltage protection circuit. The terminal resistor circuit includes a terminal resistor and a terminal switch connected to each other in series. The terminal resistor and the terminal switch jointly provide a current path between a configuration channel (CC) pin of the USB connector and a reference voltage. The terminal switch is turned on during a configuration detection period. During a power saving period after the configuration detection period ends, the overvoltage protection circuit controls the terminal resistor circuit to turn off the terminal switch. The overvoltage protection circuit detects an overvoltage event at the CC pin. When an overvoltage event occurs at the CC pin, the overvoltage protection circuit controls the terminal resistor circuit to turn on the terminal switch.

USB apparatus and operation method thereof

The USB chipset including a data processing unit, a transmitting unit, a first pin set and a second pin set is provided. The data processing unit generates a plurality of transmission information according to first information provided by a first device. The transmitting unit processes the transmission information to generate an output signal. The first pin set is configured to transmit the output signal to a second device. The second pin set is configured to transmit the output signal to the second device. When the first pin set transmits the output signal to the second device, the second pin set does not transmit the output signal to the second device. When the second pin set transmits the output signal to the second device, the first pin set does not transmit the output signal to the second device.

USB chipset

A high speed internal hysteresis comparator is provided. Impedance supply units are disposed at control terminals of transistors of an active load of a differential amplifier of the high-speed hysteresis comparator, such that a gain when the transistors operate in an active region and a responding speed of the high-speed hysteresis comparator are increased.

High-speed internal hysteresis comparator

A USB chipset coupled between a first device and a second device is provided. A data processing unit is coupled to the first device and generates a plurality of transmission information according to first information provided by the first device. A transmitting unit is coupled to the data processing unit to transmit the transmission information to the second device and includes a converting module, a first output driving module, a second output driving module, and a transmitting-terminal selecting module. The converting module is coupled to the data processing unit to receive the transmission information in parallel and serially outputs the transmission information. The first output driving module is coupled to a first pin set. The second output driving module is coupled to a second pin set. The transmitting-terminal selecting module is coupled between the converting module and the first and second output driving modules.

A slicer apparatus and a calibration method thereof are provided. A differential reference signal pair used for performing an error slicing operation is adjusted, so as to calibrate an offset voltage of the slicer apparatus.

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Taipei, Taiwan

Yu-Chung Wei