Internal voltage generating circuit and smart card

An internal voltage generating circuit configured to generate and output a first internal voltage in a contactless mode and to generate and output a second internal voltage in a contact mode, the internal voltage generating circuit comprising:

• a first voltage application unit configured to apply a first voltage that is higher in the contactless mode than in the contact mode;
• a second voltage application unit configured to apply a second voltage that is higher in the contact mode than in the contactless mode;
• a controller configured to generate a bulk voltage, a first control signal, and a second control signal based on the first and second voltages;
• a first regulator configured to be enabled or disabled according to the first control signal, wherein the first regulator is configured to generate and output the first internal voltage based on the bulk voltage, the first voltage, and a first reference voltage;
• and
• a second regulator configured to be enabled or disabled according to the second control signal, wherein the second regulator is configured to generate and output the second internal voltage based on the bulk voltage, the second voltage, and a second reference voltage, wherein the second regulator comprises:
• a second resistor unit connected between an output terminal of the internal voltage generating circuit and a ground voltage source, wherein the second resistor unit is configured to divide the second internal voltage;
• a second differential amplifier configured to differentially amplify the second reference voltage and a divided voltage of the second internal voltage and to output an amplified voltage;
• a second voltage controller configured to control the second voltage application unit and the output terminal of the internal voltage generating circuit to be connected or disconnected to/from each other according to an output signal of the second differential amplifier or the bulk voltage;
• and
• a second switch unit configured to enable or disable the second differential amplifier and the second voltage controller and to control the resistor unit and the ground voltage source to be connected or disconnected to/from each other according to the second control signal, wherein the second switch unit comprises:
• a fifth switch configured to control the second differential amplifier and the ground voltage source to be connected or disconnected to/from each other according to the second control signal;
• a sixth switch configured to control the bulk voltage to be applied or not to be applied to the first voltage controller according to the second control signal;
• and
• a seventh switch configured to control the second resistor unit and the ground voltage source to be connected or disconnected to/from each other according to the second control signal, wherein the second differential amplifier comprises:
• a third PMOS transistor including a first terminal, a second terminal, and a gate, wherein the second voltage is applied to the first terminal of the third PMOS transistor, and wherein the second terminal and the gate of the third PMOS transistor are connected to each other;
• a fourth PMOS transistor including a first terminal, a second terminal, and a gate, wherein the second voltage is applied to the first terminal of the fourth PMOS transistor, wherein the second terminal of the fourth PMOS transistor is connected to an output terminal of the second differential amplifier, and wherein the gate of the fourth PMOS transistor is connected to the gate of the third PMOS transistor;
• a third NMOS transistor including a first terminal, a second terminal, and a gate, wherein the first terminal of the third NMOS transistor is connected to the second terminal of the third PMOS transistor, wherein the second terminal of the third NMOS transistor is connected to the fifth switch, and wherein the divided voltage of the second internal voltage is applied to the gate of the third NMOS transistor;
• and
• a fourth NMOS transistor including a first terminal, a second terminal, and a gate, wherein the first terminal of the fourth NMOS transistor is connected to the output terminal of the second differential amplifier, wherein the second terminal of the fourth NMOS transistor is connected to the fifth switch, and wherein the second reference voltage is applied to the gate of the fourth NMOS transistor, and
• wherein the second switch unit further comprises an eighth switch configured to control the bulk voltage to be applied or not to be applied to the gates of the third and fourth PMOS transistor according to the second control signal.

An internal voltage generating circuit configured to generate and output a first internal voltage in a contactless mode and to generate and output a second internal voltage in a contact mode, the internal voltage generating circuit comprising:

• a first voltage application unit configured to apply a first voltage that is higher in the contactless mode than in the contact mode;
• a second voltage application unit configured to apply a second voltage that is higher in the contact mode than in the contactless mode;
• a controller configured to generate a bulk voltage, a first control signal, and a second control signal based on the first and second voltages;
• a first regulator configured to be enabled or disabled according to the first control signal, wherein the first regulator is configured to generate and output the first internal voltage based on the bulk voltage, the first voltage, and a first reference voltage;
• and
• a second regulator configured to be enabled or disabled according to the second control signal, wherein the second regulator is configured to generate and output the second internal voltage based on the bulk voltage, the second voltage, and a second reference voltage, wherein the controller comprises:
• a register configured to store priority information indicating whether the contact mode or the contactless mode has priority;
• and
• a signal generator configured to output the first voltage or the second voltage as the bulk voltage based on the priority information and to generate and output the first and second control signals based on the fist and second voltages and the priority information, wherein the signal generator comprises:
• a selection signal generator configured to generate a signal based on the priority information and the first and second voltages;
• a differential amplifier configured to differentially amplify the first and second voltages and output an amplified voltage;
• a control signal generator configured to select a first input signal corresponding to the priority information or a second input signal corresponding to an output signal of the differential amplifier according to the selection signal, to output the signal as the second control signal, and to output an inverted signal of the selected signal as the first control signal;
• and
• a bulk voltage generator configured to output the first voltage as the bulk voltage according to the control signal when the contactless mode is performed with priority and to output the second voltage as the bulk voltage according to the second control signal when the contact mode is performed with priority, wherein the control signal generator comprises:
• a multiplexer configured to select the first or second input signal according to the selection signal and to output the selected signal as the second control signal;
• and
• an inverter configured to invert the second control signal received from the multiplexer and to output an inverted signal as the first control signal.