Operational amplifier device
An operational amplifier, transmission control technology, applied in the direction of differential amplifier, DC-coupled DC amplifier, etc., can solve the problem of slow load charging or discharging speed, and increasing Miller capacitor charging or discharging time.
Active Publication Date: 2014-12-31
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology
[0006] However, in the known technology, the stability of the operational amplifier is often increased by increasing the Miller capacitance, but this method will increase the time for charging or discharging the Miller capacitance inside the operational amplifier, that is, it takes more time to output The voltage Vo drops or rises to the level of the input voltage Vi
As a result, if the transmission gate is turned on when the Miller capacitor is not fully charged or discharged, the output stage of the operational amplifier cannot be fully turned on, resulting in the output voltage Vo not yet reaching the level of the input voltage Vi, that is, the charging or discharging speed of the load becomes slower
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[0038] Please refer to Figure 2A , Figure 2A It is a block diagram of an operational amplifier device 20 in an embodiment. The operational amplifier device 20 includes an operational amplifier 202 , transmission gates 204 , 206 and switch modules 208 , 210 . The operational amplifier device 20 is partially similar to the operational amplifier device 10, so components and signals with similar functions and structures are denoted by the same symbols. The transmission gate 204 and the transmission gate 206 can be implemented as an N-type transistor MN0' and a P-type transistor MP0' respectively, and their gates can be used as the transmission control terminal TC, respectively. N0 with TC P0 . The main difference between the operational amplifier device 20 and the operational amplifier device 10 is that the operational amplifier device 20 adds switch modules 208, 210, which can be respectively set at the negative signal input terminal NSI o Between the transmission gate 204...
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The invention discloses an operational amplifier device, which comprises an operational amplifier, a first transmission gate and a first switch module. The operational amplifier comprises an output stage which is provided with a first signal input end and a signal output end, and output voltage is output from the signal output end of the output stage. The first transmission gate is coupled between the signal output end and a transmission output end and is provided with a first transmission control end. The first switch module is used for controlling electrical connection between the first signal input end and the first transmission control end. During the first transmission period, the first switch module controls the first transmission control end to be coupled to the first signal input end, so that the first transmission gate is closed to transmit the output voltage and further can be used as a miller capacitor.
Description
technical field [0001] The invention relates to an operational amplifier device, in particular to an operational amplifier device which can use a transmission gate for capacitance compensation. Background technique [0002] Generally, a transmission gate is composed of an N-type metal oxide semiconductor (MOS) transistor and a P-type metal oxide semiconductor. By adjusting the gate voltage of the N-type metal oxide semi-transistor and the P-type metal oxide semi-transistor, the conduction and closure of the transmission gate can be controlled, and then it can be determined whether to output the voltage received by the transmission gate to an external load from a transmission output terminal , such as transmitting the output voltage of an operational amplifier to an external load. [0003] For example, please refer to Figure 1A , Figure 1A is a schematic diagram of a conventional operational amplifier device 10 . Such as Figure 1A As shown, the operational amplifier devi...
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IPC IPC(8): H03F3/45
Inventor 黄如琳陈鹏宇
Owner NOVATEK MICROELECTRONICS CORP