Charge pump drive circuit with two switch signals

A charge pump drive circuit for providing a charge pump with a switch signal, the charge pump configured to provide a memory with a read voltage and a read current, the charge pump drive circuit comprising a read drive circuit and a standby drive circuit, wherein:

• the read drive circuit is powered by a first power supply and provides the charge pump with a first switch signal when the memory is in a read active state;
• the standby drive circuit is powered by a second power supply and provides the charge pump with a second switch signal when the memory is in a read standby state;
• and
• the first power supply provides a voltage level ranging from 1.6 V to 3.8 V and the second power supply provides a voltage level of 1.5 V;
• wherein the charge pump drive circuit further comprises an OR gate having two inputs connected respectively to an output of the read drive circuit and an output of the standby drive circuit and an output connected to the charge pump;
• wherein when the memory is in a writing, erasing or programming state, the read drive circuit provides the charge pump with the first switch signal;
• wherein the charge pump drive circuit further comprises a first signal selection circuit and a second signal selection circuit, wherein:
• the first signal selection circuit is provided with a first reference signal, a second reference signal and a selection signal;
• the second signal selection circuit is provided with a first feedback voltage, a second feedback voltage and the selection signal;
• the selection signal is dependent on the state of the memory;
• when the memory is in the read active state or the read standby state, the selection signal causes the first signal selection circuit to output the first reference signal and causes the second signal selection circuit to output the first feedback voltage;
• and
• when the memory is in the writing, erasing or programming state, the selection signal causes the first signal selection circuit to output the second reference signal and causes the second signal selection circuit to output the second feedback voltage.