| 摘要 |
An analog data transmitter applied in a LCD apparatus includes an output pad, a channel operational amplifier, an initial switch, an auxiliary switch module, and a detection unit. The detection unit selectively starts a first switch unit or a second switch unit of the auxiliary switch module according to a pulse width modulation corresponding to a data conversion amplitude of an output data signal outputted from the output pad. During a period of the first switch unit or the second switch unit operating from a first time to a second time, transistors in an output stage of the channel operational amplifier operate in a linear region of smaller resistance instead of a saturation region of larger resistance, and the initial switch is turned-off during the period and not started until the second time. The length of the period corresponds to the pulse width modulation. |
| 主权项 |
1. An analog data transmitter, applied in a liquid crystal display (LCD) apparatus, the analog data transmitter comprising:
an output pad, for outputting an output data signal; a channel operational amplifier, comprising a first input terminal, a second input terminal, and an output stage, wherein the output stage comprises a plurality of transistors and the first input terminal is used to receive an input data signal; an initial switch, coupled to the output stage; an auxiliary switch module, coupled between the initial switch and the output pad, the auxiliary switch module comprising a first switch unit and a second switch unit, wherein the first switch unit and the second switch unit are coupled in series between an operating voltage and a ground terminal, the initial switch and the output pad are both coupled between the first switch unit and the second switch unit; and a detection unit, coupled to the second input terminal, the output pad, and the auxiliary switch module, for selectively starting the first switch unit or the second switch unit of the auxiliary switch module according to a pulse width modulation corresponding to a data conversion amplitude of the output data signal outputted from the output pad; wherein during a period from a first time T0 a second time, the first switch unit or the second switch unit is started at the first time and then operated until the second time, the plurality of transistors in the output stage is operate in a linear region of smaller resistance instead of a saturation region of larger resistance, and the initial switch is turned-off during the period and not started until the second time, a time length of the period corresponds to the pulse width modulation. |
