摘要:
A level shift circuit shifting logic levels of an SCFL circuit to logic levels of a DCFL circuit, including an SCFL circuit having complementary outputs; two source follower circuits with their inputs respectively connected to the complementary outputs of the SCFL circuit; a high/low detecting circuit detecting "high" or "low" signals which have DCFL levels from the two source follower circuits and outputting signals having logic levels according to the detection results; and DCFL circuits with inputs connected to outputs of the high/low detecting circuit. Therefore, it is possible to obtain a level shift circuit operating with a wider voltage range and in a wider temperature range than the prior art circuit.
摘要:
A quadrature modulator includes a 0.degree./90.degree. phase shifter including only resistors, capacitors, and transistors that separates an input carrier wave into two carrier waves having a phase difference of 90.degree. from each other by differentiating and integrating. The quadrature modulator includes amplitude compensating circuits for converting the two carrier waves from sinusoidal waveforms to rectangular waveforms having predetermined amplitudes. The amplitude compensating circuits are inserted between the phase shifter and double-balanced mixers. The phase shifter consists of circuit elements appropriate for circuit integration and produces a high degree of orthogonality in its output signals as a function of variations in the characteristic values of the circuit elements. Complementary carriers having precise orthogonality as well as superior balance are input to double-balanced mixers. Accordingly, a superior modulation wave having fewer spurious components is obtained easily with simplified circuit integration.
摘要:
A bias circuit includes a resistor in parallel with a voltage-drive bias circuit including a GaAs-HBT transistor. This configuration ensures that a current can be supplied from a reference voltage input terminal to the base terminal of a first transistor via the resistor in an idling state in which a voltage applied to the base terminal is lower than a voltage at which a second transistor operates, thereby enabling a desired amplifying operation while maintaining the idling current generally constant in a temperature range, even when the reference voltage is reduced to a value lower than twice the barrier voltage of the GaAs HBT.
摘要:
A power amplifier circuit includes a first field effect transistor power amplifier having a gate; a gate voltage supply for supplying a gate voltage to the gate of the first field effect transistor; and a gate voltage control including a second field effect transistor which has the same threshold voltage as the first field effect transistor. The gate voltage control receives, as an input voltage, the gate voltage output from the gate voltage supply, and increases the gate voltage when the gate voltage is lower than the threshold voltage of the first field effect transistor, preventing the first field effect transistor from being pinched off. Therefore, when the pinch-off voltage of the first field effect transistor varies or when the voltage supplied from the gate voltage supply varies, unwanted pinch-off of the first field effect transistor is avoided in the lower power consumption state so that the stability of the circuit is improved.
摘要:
An image formation apparatus includes an image reading control unit and a print control unit. The print control unit includes: a first communication control unit connected to the image reading control unit; and a power supply control unit configured to control power supply to the image reading control unit. The image reading control unit includes: a second communication control unit connected to the first communication control unit. When completing a process to transition to a power save mode in accordance with an instruction from the print control unit, the image reading control unit cuts off the communications through the second communication control unit. After sending the image reading control unit the instruction to transition to the power save mode, the print control unit detects the cutoff of the communications and then cuts off the power supply to the image reading control unit through the power supply control unit.
摘要:
In a fuel cell including an electrolyte layer allowing an anion component to migrate, and a fuel-side electrode and an oxygen-side electrode arranged to face each other while sandwiching the electrolyte layer, the oxygen-side electrode contains a first catalyst containing a first transition metal and polypyrrole, and a second catalyst containing a second transition metal and a porphyrin ring-containing compound so that the mixing ratio of the first catalyst relative to 100 parts by mass of the total amount of the first catalyst and the second catalyst is more than 10 parts by mass, and below 90 parts by mass.
摘要:
A sheet processing apparatus includes: a stacking unit that stacks conveyed sheets; an aligning unit that aligns the sheets stacked on the stacking unit in a sheet conveying direction; a binding unit that moves along an end portion of a bundle of the sheets on a binding portion side and performs a binding process for the bundle of the sheets that have been aligned by the aligning unit; a pressing unit that presses the bundle of the sheets at the end portion thereof on the binding portion side; and an interlocking unit that moves the pressing unit in association with a motion of the binding unit.
摘要:
A detector circuit for detecting degradation in the distortion characteristics of a power amplifier based on signals from both ends of a coupled line of a directional coupler. The detector circuit includes a phase shifter/attenuator for phase shifting and attenuating a signal from a coupled terminal of the coupled line, a differential amplifier for outputting difference between an output signal from the phase shifter/attenuator and a signal from the isolated terminal of the coupled line, a wave detector circuit for converting the difference into a DC signal, and a comparing circuit for determining whether the voltage level of the DC signal exceeds a predetermined level. When degradation in the distortion characteristics of the power amplifier arises, the phase shifter/attenuator phase shifts the signal from the coupled terminal and outputs a signal 180° out of phase with the signal from the isolated terminal.
摘要:
A power amplifier includes: an amplifying element having a base into which input signals are inputted, a collector to which a collector voltage is applied, and an emitter; and a bias circuit supplying a bias current to the base of the amplifying element. The bias circuit includes a bias current lowering circuit which lowers the bias current when the collector voltage is lower than a prescribed threshold value.
摘要:
A skew correction device includes a first conveying unit arranged in a sheet conveying path; a second conveying unit arranged downstream of the first conveying unit in a conveying direction of a sheet; and a skew correction unit. When the sheet is unfolded paper, the skew correction unit performs a first skew correction that corrects for the skew of the sheet so that a leading edge of the sheet conveyed by the first conveying unit abuts on the second conveying unit that is stopped. When the sheet is fold paper, the skew correction unit performs a second skew correction that corrects for the skew of the sheet so that a leading edge of the sheet conveyed by the first conveying unit abuts the second conveying unit and the second conveying unit is driven in a reverse direction to the conveying direction at a predetermined operational timing.