Patent application number | Description | Published |
20120039425 | ZERO-CROSSING GAIN CONTROL SYSTEM AND ASSOCIATED METHODS - A zero-crossing gain control system is disclosed herein. The system comprises a gain control unit for amplifying an input signal to an output signal, a zero-crossing monitoring circuit for monitoring the input signal or output signal, and a register for latching the digital control signal and generating a gain control signal that controls the gain control unit. The system may further comprise a maximum write time setting circuit for generating a write signal. The digital control signal is written into the register when a zero-crossing state is monitored or a maximum write time since a change occurred on of the digital control signal is expired. An automatic gain control system is also disclosed herein and further comprises a peak detecting circuit for detecting the level of output signal, a logic circuit for lowering or restoring the digital control signal according to the result from the peak detecting circuit. | 02-16-2012 |
20130076329 | Equalization circuit and equalization system - An equalization circuit, includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, a first regulating circuit, a second regulating circuit, and a bias voltage generating circuit. The bias voltage generating circuit is connected with both the first regulating circuit and the second regulating circuit. The first regulating circuit includes a first field effect transistor (FET), a second FET, a third FET, a fourth FET, a first resistor connected with the first FET, a second resistor connected with the second FET, a third resistor connected with the third FET, a fourth resistor connected with the fourth FET, a fifth resistor connected with the third FET, a sixth resistor connected with the fourth FET, a first capacitor connected with the third FET, and a second capacitor connected with the fourth FET. An equalization system is further provided. | 03-28-2013 |
20130077702 | Serial data transmission system and method - A serial data transmission system, includes a transmitting terminal for transmitting a data, a receiving terminal for receiving the data transmitted by the transmitting terminal, a first connecting capacitor connected between the transmitting terminal and the receiving terminal, and a second connecting capacitor connected between the transmitting terminal and the receiving terminal, wherein the transmitting terminal comprises a transmitting terminal driver unit and an amplitude detection unit connected with the transmitting terminal driver unit, the transmitting terminal driver unit outputs a pair of differential signals, the amplitude detection unit detects an amplitude variation of the differential signals output by the transmitting terminal driver unit, and outputs an indication signal indicating whether the transmitting terminal and the receiving terminal are properly connected with each other. A serial data transmission method is further provided. | 03-28-2013 |
20140300336 | LOAD REGULATION COMPENSATION MODULE AND SWITCHING CONVERTER COMPRISING THE SAME - A switching converter and a load regulation compensation module for improving load regulation accuracy of the switching converter. The switching converter regulates its output voltage through controlling a switch module to switch on and off based on a first reference signal and a feedback signal indicative of the output voltage. The on and off switching of the switch module generates a switching current, resulting in an average offset voltage between an internal reference ground and a package ground pin of the switching converter. The load regulation compensation module is configured to monitor the switching current, and to compensate a second reference signal having a bandgap reference voltage referenced to the internal reference ground based on the monitored switching current to generate the first reference signal, so that the average offset voltage is substantially cancelled out from the first reference signal with respect to the package ground pin. | 10-09-2014 |
20140354256 | SWITCH-MODE POWER SUPPLY, CHARGING CURRENT SOURCE AND ASSOCIATED METHOD - A switch-mode power supply includes a converter, a controller and a charging current. The charging current includes a logic circuit, a first current source and a second current source, to generate a charging current proportional to an input voltage of the switch-mode power supply, and also to generate a logic control signal indicative of either of two operation modes. | 12-04-2014 |
20150042299 | SOFT START SWITCHING POWER SUPPLY SYSTEM - A switching power supply system includes a switching converter, to convert an input voltage into an output voltage and to generate a switching signal; a feedback circuit, to generate a feedback signal; an error amplifier to generate an error signal; a triangle signal generator to generate a triangle signal; a constant on time control circuit to receive error signal and the triangle signal, and to generate a constant on time control signal to control power switch; in the system. The triangle signal has a DC bias based on either a soft start signal or a second reference signal. The system could perform soft start function and meanwhile keep matching between the error signal and the triangle signal. | 02-12-2015 |
20150326106 | SOFT START CIRCUIT FOR SWITCHING CONVERTER AND ASSOCIATED SOFT START METHOD - A soft start circuit for a switching converter, the soft start circuit has an internal soft start voltage generating circuit, an amplifier circuit and a buffer circuit, the internal soft start voltage generating circuit provides an internal soft start voltage, the amplifier circuit has a first input terminal receiving the internal soft start voltage, a second input terminal receiving a soft start reference signal and an output terminal, the buffer circuit has an input terminal coupled to the output terminal of the amplifier circuit and an output terminal providing the soft start reference signal. An external soft start capacitor coupled to the output terminal of the amplifier circuit is charged to provide an external soft start voltage, and the soft start reference signal is provided based on the internal soft start voltage and the external soft start voltage. | 11-12-2015 |
20150378386 | TRANS-CONDUCTANCE REGULATION CIRCUIT, TRANS-CONDUCTANCE ERROR AMPLIFIER AND POWER CONVERTER - A trans-conductance regulation circuit, a trans-conductance error amplifier module and a power converter. The trans-conductance regulation circuit provides a bias current at least partially based on an output voltage of the power converter. The bias current is sent to bias a trans-conductance operational amplifier in the trans-conductance error amplifier module so that a trans-conductance of the trans-conductance operational amplifier is direct proportional to the output voltage of the power converter. The power converter regulates the output voltage based on a negative feedback loop comprising the trans-conductance error amplifier module. The trans-conductance error amplifier module may help to maintain a band width of the negative feedback loop substantially stable and immune to variations in the output voltage. | 12-31-2015 |
20150381049 | POWER CONVERTER WITH PSEUDO-CONSTANT-ON-TIME CONTROL AND THE CONTROL CIRCUIT AND METHOD THEREOF - A control circuit for controlling a switching circuit is disclosed. The control circuit has a ramp compensation circuit, a ramp regulating circuit and a comparison circuit. The ramp compensation circuit generates a ramp compensation signal with the amplitude proportional to the difference between 1 and the duty cycle of a main switch of the switching circuit. The ramp regulating circuit generates a ramp regulating signal with the amplitude proportional to the duty cycle of the main switch. The comparison circuit compares a reference signal with the sum of the ramp compensation signal, the ramp regulating signal and a feedback signal representative of an output voltage of the switching circuit, so as to provide a comparison result to control the switching circuit. | 12-31-2015 |