193 results about "Push–pull output" patented technology

An improved, open-loop push-pull driver is described. Closed-loop feedback loop techniques for control of the push-pull driver are described. These techniques are particularly well adapted to control shoot-through current in a push-pull driver circuit.

A plate voltage generation circuit comprises: first and second differential circuits (11a, 11b) supplied with a reference voltage (VREF) and an output voltage (VOUT), respectively; a push-pull output circuit (3), connected to the first and second differential circuits, for generating the output voltage; and first and second dead-band control circuits, connected to the first and second differential circuits, respectively, for changing the width of a dead band of the output voltage in accordance with a high level or a low level of dead-band control signals (Sa, Sb) externally supplied.

Pulse-width-modulating class D amplifier with an H-bridge output stage, and method of operating the same. in which output stage dead-time is compensated. Offset logic circuitry detects various dead-time-related conditions at push-pull output drivers, and generates an offset signal applied to the amplified differential input signal, to adjust the time at which the voltage at differential signal lines crosses a ramp reference waveform. The offset signal can correspond to the duration of a disturbance (dead-time at one driver in combination with an active signal at the active driver), or the sum of that disturbance duration with a dead-time at the active driver. The offset signal is generated by charging a capacitor for the duration of this disturbance, or disturbance plus dead-time. According to another approach, error is reduced by charging a capacitor for each transition of the signal for a duration of the dead-time of the active driver. Total harmonic distortion is reduced without requiring increased circuit complexity and without shortening the dead-time to unsafe margins.

A non-contact electric power transmission circuit according to an embodiment of the invention includes an electric power transmission circuit and an electric power receiving circuit. The electric power transmission circuit includes a full bridge circuit and a resonant type full bridge circuit. A direct-current power supply is used as an input of the full bridge circuit, the full bridge circuit includes two sets of switching elements, two switching elements being connected in series in each set of the switching elements, a drive circuit alternately feeds a pulse signal to gates of the switching elements to perform switching of the direct-current input in the full bridge circuit, and a serial resonant circuit of a resonant capacitor and an electric power transmission coil is connected to an output of the full bridge circuit in the resonant type full bridge circuit. The electric power receiving circuit includes an electric power receiving coil and a rectifying and smoothing circuit. The electric power receiving coil is electromagnetically coupled to the electric power transmission coil, and the rectifying and smoothing circuit rectifies an output of the electric power receiving coil. In the non-contact electric power transmission circuit, a push-pull output PWM control circuit is provided in the drive circuit that controls the full bridge circuit, and only one of the switching elements in each set of switching elements performs a regenerative operation. Therefore, a non-contact electric power transmission circuit in which the resonant type full bridge circuit can be controlled by PWM control at a level similar to that of a phase shift operation can be provided.

A buffer amplifier for source driver is disclosed. The buffer amplifier has an N-channel differential amplifier and a P-channel differential amplifier as its input stages so as to achieve rail-to-rail input, and a class AB amplifier to push-pull the output stage so as to achieve rail-to-rail output. The output stage of the buffer amplifier is capable of larger charge / discharge, is faster, and has equal charge / discharge time. More importantly, the buffer amplifier has advantages such as lower power consumption, higher slew rate, and a more stable output.

An apparatus and method for increasing a slew rate of an operational amplifier are provided. It only requires an operational amplifier, a monitoring control device, a push-pull output device, and a second input current source pair. It uses a monitoring control device controlled by the output stage to control the supplementary device and the second input current source pair in order to increase a slew rate of an operational amplifier. This operational amplifier also provides the rail-to-rail output function. In addition, because it does not require additional circuit to increase the slew rate, the chip size is smaller. With respect to the circuit structure, it is very simple and can be applied to the pre-existing operational amplifier without re-designing the operational amplifier and thus can keep the original characteristics of the operational amplifier.

An output buffer (100) for a TFT-LCD display device comprising a push-pull output stage having a first device (Mp) for supplying current to an output terminal (Vout) and a device for slave A second device (Mn) that draws current at its output. A first preamplifier (101) is coupled to an input (Vin) of a buffer for driving a first device to provide current to an output. A second preamplifier (102), coupled to the input for driving a second device drawing current from the output; the first switchable offset is related to the first preamplifier (101) and the second switchable offset The quantity is related to the second preamplifier (102). A switchable current source (Ip) is used to supply current to the output and a switchable current sink (In) is used to draw current from the output. The switching input φ1 is used to activate the first switchable offset and switchable current source and the complementary switching input φ2 is used to activate the second switchable offset and switchable current sink.