Shenzhen Sts Microelectronics Co., Ltd.

Gangqiang Zhang

Ni Zeng

Fansheng Meng

A differential amplifier receives a differential input signal and generates an output signal at an output node. An auxiliary circuit coupled to the differential amplifier operates to improve slew rate response. In quiescent and small signal situations with respect to the differential input signal, the auxiliary circuit does not alter or change operation of the differential amplifier. However, in situations where a large signal change is experienced with respect to the differential input signal, the auxiliary circuit functions to speed up the sourcing and sinking current to/from the output node. A stability compensation capacitor coupled to the output node is accordingly more quickly charged or discharged and an improvement in slew rate performance of the differential amplifier is experienced.

Differential amplifier having an improved slew rate

A precise over-voltage comparator exhibits zero-waiting-current characteristics during normal working conditions. An NMOS transistor is used in conjunction with other circuit elements to regulate the over-voltage comparator. For normal power supply voltages, the comparator stays in standby status and does not consume quiescent current.

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Gangqiang Zhang