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 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:
A first phase comparator 22 of digital type and a second phase comparator 32 of sampling type are provided. Near a lock phase, an output current Iout2 is fed from the second phase comparator 32 to a voltage-controlled oscillator 14 through a change-over switch 40. In other phases, an output current Iout1 is fed thereto from the first phase comparator 22. When a reference signal fs is missing, a complementing circuit 50 complements a pulse to at least the reference signal fs input to the first phase comparator 22. A noise detecting/removing circuit 60 detects and removes noise from the reference signals fs, permits the reference signals fs to be fed to the first and second phase comparators 22 and 23, and halts the operations of the two phase comparators 22 and 32 for only a predetermined period of time after the noise has been detected. Therefore, the PLL circuit stably operates and characters are clearly displayed on a screen even when the noise is contained in the horizontal synchronizing signals of the video signals or even when the signals are missing.
摘要:
A dust filter of an evaporated fuel treatment device is taught that preferably include a filtration member for filtering air introduced to an atmosphere introduction path, and a casing receiving the filtration member therein. The dust filter being disposed on the atmosphere introduction path of the evaporated fuel treatment device. The filtration member has an arcuate shape in cross section, and wherein the filtration member is arranged and structured such that air flows in a radial direction thereof, so as to be filtered.
摘要:
The detector is reduced in DC power consumption when an input signal is at a low amplitude level. The detector includes first and second input terminals, first and second transistors, and a load element. The first and second input terminals are supplied with complementary input signals reverse to each other in phase. The first input terminal is connected to the first input electrode of the first transistor and the second input electrode of the second transistor. The second input terminal is connected to the second input electrode of the first transistor and the first input electrode of the second transistor. The load element is connected between output electrodes of the transistors and an operating voltage point. A detection voltage resulting from full-wave rectification arises from a circuit node. In the condition where a signal input to the input terminals is at a low amplitude level, the transistors are both in OFF state. Thus, DC power consumption is reduced.
摘要:
The present invention is directed to shorten time required to establish a connection and enable information to be actually transmitted/received in a noncontact IC card adaptable to a plurality of communication methods. A semiconductor integrated circuit device of the invention includes: a single demodulating circuit capable of demodulating an input signal; a plurality of sampling circuits each capable of sampling output signals of the demodulating circuit synchronously with a predetermined clock signal; a plurality of detection circuits capable of detecting headers of output signals of the corresponding sampling circuits; a plurality of processing circuits capable of performing a predetermined data process on the basis of detection results of the corresponding detection circuits; and a communication method determining circuit capable of determining a match to a preset communication method from results of the header detection by the plurality of detection circuits. By performing processes adapted to a plurality of different communication methods in parallel, time required to establish a connection and enable information to be actually transmitted/received is reduced.
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:
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 a video signal apparatus, a carrier signal generating circuit includes a VCO for generating a signal having a frequency at least twice that of a carrier signal necessary for conversion to a lower band with a sub-carrier in an NTSC system, a one-half divider circuit for dividing the VCO frequency signal by two, a delayed flip-flop circuit for receiving the divided signal and the sub-carrier signal to generate a difference frequency signal, a 1/40 divider circuit for dividing the Q output, a phase comparator circuit for comparing the phases of the 1/40 divided signal and the horizontal synchronizing signal to output a phase difference, a frequency discriminator circuit for comparing the phase of the flip-flop output with the frequency-divided output of the horizontal synchronizing signal to output a frequency error, and a circuit for converting the output of the phase comparator circuit and the frequency error into DC voltages and applying their sum as a control voltage for the VCO. A CR constant control circuit controls the CR constant of a four-phase signal generator for converting the output of the one-half divider circuit into a four-phase signal.
摘要:
The present invention is to enable an adsorbent disposed in the vicinity of a tank port to be appropriately subjected to a purge when the adsorbent in a canister is subjected to the purge by air, thereby eliminating a non-desorption region of fuel vapor. In a fuel tank according to the present invention, a tank port (20t) that communicates with a space in a fuel tank body (10m), a purge port (20p), and an atmosphere port (20a) are formed in a container (21) of a canister (20) constituted by a container body (22) and a cover material (23), an inside of the container (21) of the canister (20) is configured to be partitioned to form passages (T1) and (T2) so that insides of the passages (T1) and (T2) are filled with an adsorbent (C), and the atmosphere port (20a) is provided on one end side in an air flow direction of the passages (T1) and (T2) and the tank port (20t) is provided on the other end side in the air flow direction of the passages (T1) and (T2) together with the purge port (20p).