Voltage generator

摘要

A voltage generator adapted for a flash memory is disclosed. The voltage generator includes a charge pump circuit and a voltage regulator. The charge pump circuit includes at least one charge pump unit having a voltage receiving terminal and a voltage transmitting terminal. The voltage receiving terminal receives a reference voltage and the voltage transmitting terminal generates an output voltage. The charge pump unit includes first and second voltage transmitting channels and first and second capacitors. The first and second voltage transmitting channels are turned on or off according first and second control signals, respectively. The first and second capacitors receive the first and second pump enabling signals, respectively. The voltage regulator outputs a regulated output voltage according to the output voltage.

主权项

1. A voltage generator adapted for a flash memory, comprising:
a charge pump circuit comprising at least one charge pump unit, the charge pump circuit having a voltage receiving terminal for receiving a reference voltage and a voltage transmitting terminal for outputting an output voltage, and the charge pump unit comprising:
a first voltage transmitting channel having one terminal coupled to the voltage receiving terminal, the first voltage transmitting channel being turned on or off according to a first control signal;a first capacitor connected in series between the voltage receiving terminal and a first pump enabling signal;a second voltage transmitting channel having one terminal coupled to a second terminal of the first voltage transmitting channel, the second voltage transmitting channel being turned on or off according to a second control signal, a second terminal of the second voltage transmitting channel being coupled to the voltage transmitting terminal; anda second capacitor, coupled between the second terminal of the first voltage transmitting channel and a second pump enabling signal in serial; a voltage regulator coupled to the voltage transmitting terminal of the charge pump unit to receive the output voltage and output a regulated output voltage according to the output voltage; and a signal generator coupled to the charge pump circuit, receiving a target output voltage, and configured for generating the first and second control signals and the first and second pump enabling signals according to the target output voltage, wherein the first pump enabling signal is enabled during a first enabling period, and the second pump enabling signals is enabled during a second enabling period, wherein the first and second enabling periods does not overlap and are different in length, wherein the first control signal having a third enabling period is enabled within the first enabling period, and the second control signal having a fourth enabling period is enabled within the second enabling period, wherein the enabling of the first control signal is delayed as compared to the first pump enabling signal, and the second control signal is delayed as compared to the second pump enabling signal, wherein the output voltage is dynamically adjusted by respectively adjusting the first pump enabling signal and the second pump enabling signal, so that the output voltage is close to the regulated output voltage.