Patent ID: 8164379

Claim:
A voltage generator capable of preventing latch-up, comprising: a positive charge pump unit, for generating a positive charge pump voltage according to an input voltage and a first enable signal; a negative charge pump unit, for generating a negative charge pump voltage according to the input voltage and a second enable signal; a second stage charge pump unit, coupled to the positive charge pump unit and the negative charge pump unit, for generating a gate-on voltage and a gate-off voltage according to a third enable signal, a fourth enable signal, a positive target multiplication factor, a negative target multiplication factor, the positive charge pump voltage and the negative charge pump voltage; and a control unit, coupled to the positive charge pump unit, the negative charge pump unit, and the second stage charge pump unit, for generating the first enable signal, the second enable signal, the third enable signal, the fourth enable signal, the positive target multiplication factor and the negative target multiplication factor to control the second stage charge pump unit to generate the gate-on voltage in a successively-increasing manner until the gate-on voltage conforms to the positive target multiplication factor and to generate the gate-off voltage in a successively-decreasing manner until the gate-off voltage conforms to the negative target multiplication factor.