摘要:
A semiconductor integrated circuit device and a contactless electronic device are provided with a power supply circuit producing a stable smooth voltage with high efficiency for stable operation of an inner circuit. An AC voltage is applied to first and second input terminals and a rectification transistor having drain (or collector) connected to second input terminal and gate (or base) and drain (or collector) connected to each other through resistor supplies a rectified current between the first and second input terminals. The first voltage detection means produces control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to the predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor means. Such power supply circuit is mounted in the contactless electronic device.
摘要:
In a semiconductor integrated circuit device and a contactless electronic device, an AC voltage is applied to first and second input terminals. A rectification transistor having a drain (or collector) connected to a second input terminal and gate (or base) and drain (or collector) connected to each other through a first resistor supplies a rectified current between the first and second input terminals. A first voltage detector means produces a control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to a predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor. Such a power supply circuit is mounted in the contactless electronic device.
摘要:
In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. Therefore, the voltage controlling circuit of the present invention includes a voltage controlling current source, and when the internal circuit is not operated and the current higher than a predetermined current is detected in the voltage controlling current source, an operating current detector circuit outputs an enable signal. When the internal circuit is operated in response to the enable signal, the current consumed in the internal circuit is subtracted from the current passing through the voltage controlling current source. Consequently, the current change in the entire internal power supply can be prevented, and the output voltage of the internal power supply can be kept constant.
摘要:
In an IC card of dual-way type which is used in common as a non-contact/contact operation card, an isolation transistor is provided between a power supply voltage terminal and a contact power supply circuit. Non-contact/contact judging and switching unit 6 turns OFF, when it is detected that the IC card is operated in a non-contact operation mode, an isolation transistor to isolate between the power supply voltage terminal and contact power supply circuit. Accordingly, when the power supply voltage terminal is terminated with a ground terminal during the non-contact operation mode, erroneous operation of the IC card can surely be prevented. Since the power supply voltage terminal becomes equal to a reference potential in this case, monitoring of voltage of the power supply voltage terminal can be prevented and security of the IC card can also be improved remarkably.
摘要:
A nonvolatile memory device and a data processing system with a reduced layout area are capable of efficiently generating a high voltage without deteriorating the charge transfer efficiency of a charge pump circuit. The charge pump circuit in a nonvolatile memory device includes a plurality of stages of charge pump unit circuits. A voltage generating unit provides, as a control signal to the gate of a first MOS transistor for transferring charges from a first capacitor of a charge pump unit circuit of one stage to a first capacitor at the next stage, a fourth signal having an amplitude of a difference voltage between the power supply voltage and the charge pump voltage of the first capacitor at the one stage. The fourth control signal is obtained from second and third signals each changing in amplitude of the power supply voltage. The second signal is supplied via a second capacitor.
摘要:
In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. Therefore, the voltage controlling circuit of the present invention includes a voltage controlling current source, and when the internal circuit is not operated and the current higher than a predetermined current is detected in the voltage controlling current source, an operating current detector circuit outputs an enable signal. When the internal circuit is operated in response to the enable signal, the current consumed in the internal circuit is subtracted from the current passing through the voltage controlling current source. Consequently, the current change in the entire internal power supply can be prevented, and the output voltage of the internal power supply can be kept constant.
摘要:
In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. Therefore, the voltage controlling circuit of the present invention includes a voltage controlling current source, and when the internal circuit is not operated and the current higher than a predetermined current is detected in the voltage controlling current source, an operating current detector circuit outputs an enable signal. When the internal circuit is operated in response to the enable signal, the current consumed in the internal circuit is subtracted from the current passing through the voltage controlling current source. Consequently, the current change in the entire internal power supply can be prevented, and the output voltage of the internal power supply can be kept constant.
摘要:
In an IC card in which an internal circuit is operated by an internal power supply formed from alternate current from outside received by an antenna, the voltage of the internal power supply sometimes changes due to the operation of the internal circuit. Therefore, the voltage controlling circuit of the present invention includes a voltage controlling current source, and when the internal circuit is not operated and the current higher than a predetermined current is detected in the voltage controlling current source, an operating current detector circuit outputs an enable signal. When the internal circuit is operated in response to the enable signal, the current consumed in the internal circuit is subtracted from the current passing through the voltage controlling current source. Consequently, the current change in the entire internal power supply can be prevented, and the output voltage of the internal power supply can be kept constant.
摘要:
A fuel vapor processing apparatus may include a case defining therein a first adsorption chamber, a second adsorption chamber and a non-adsorption chamber communicating between the first adsorption chamber and the second adsorption chamber. The cross sectional flow area of the first adsorption chamber may be smaller than the cross sectional flow area of the second adsorption chamber.
摘要:
A semiconductor device improved in IC card function is disclosed. An external connecting terminal for extended interface not conforming to ISO/IEC7816-3 is disposed on a first main surface of a card chip and in an area sandwiched in between two rows of external connecting terminals for interface conforming to ISO/IEC7816-3 which is for IC card function. With this layout, the memory card function and other electronic circuit functions can be incorporated into the card chip and hence it is possible to improve the function of the card chip.