摘要:
A process for preparing a fine powder of perovskite-type compounds having an average particle size of at most 0.3 .mu.m and uniform particle sizes, which comprises subjecting to a reaction an aqueous solution of a mixture of at least one compound selected from group A element compounds comprising alkaline earth metal elements and/or bivalent metal elements with at least one compound selected from group B element compounds comprising tetravalent metal elements such as Ti, Zr, Hf and Sn and/or composite metal elements composed of a bivalent or trivalent metal element such as Zn, Ni, Co, Mg, Fe or Sb and a pentavalent metal element such as Nb or Sb in an A/B atomic ratio of more than 1, calcining the resulting powdery reaction product at a temperature which is lower than the temperature at which the growth of particles takes place and which is higher than the temperature at which the growth of particles takes place when A/B is 1, and cleaning the calcined product with an acid solution to remove the excess group A elements. The process provides fine powders of perovskite-type compounds having a good crystallinity, particularly tetragonal barium titanate, which are useful particularly as raw materials of ceramics for electronic devices.
摘要:
An analog switch circuit includes: an analog switch composed of a first P-channel MOS transistor and a first N-channel transistor, a gate of which receives a control signal; a comparison circuit comparing potentials of a first input-output-terminal and a second input-output terminal, and conveying a higher potential to a well where the first P-channel MOS transistor is formed; a first potential conveying circuit conveying a potential of the well where the first P-channel MOS transistor is formed to a gate of the first P-channel MOS transistor when the analog switch is in the OFF state; a second potential conveying circuit operating on the basis of a control signal to convey the potential of the well where the first P-channel MOS transistor is formed to the gate of the first P-channel MOS transistor to turn off the first P-channel MOS transistor; and a third potential conveying section operating on the basis of the control signal to turn on the first P-channel MOS transistor.
摘要:
An output circuit comprising an output stage and a control signal generator. The output stage is constituted by a first P-channel MOS transistor and an N-channel MOS transistor. The control signal generator generates a signal for driving the gates of the MOS transistors, it comprises a NAND gate, a NOR gate NOR1 and an inverter INV1. The first P-channel MOS transistor of the output stage has a source and a back gate which are isolated in terms of potential. A second P-channel MOS transistor is provided, whose source-drain path is connected between the back gate and gate of the first P-channel MOS transistor incorporated in the output stage.
摘要:
The bus hold circuit comprises: an input stage inverter (IN1) connected between a first supply voltage (Vcc) terminal and a second supply voltage (Vss) terminal and including: a first P-channel transistor (P1); and a first N-channel transistor (N1) connected in series to the first P-channel transistor, a gate of the first P-channel transistor and a gate of the first N-channel transistor being connected in common to a bus line (INA); and an output stage inverter (IN2) also connected between the first supply voltage (Vcc) terminal and the second supply voltage (Vss) terminal and including: a second P-channel transistor (P4); a third P-channel transistor (P2) connected in series to the second P-channel transistor; and a second N-channel transistor (N2) connected in series to the third P-channel transistor, a gate of the second P-channel transistor (P4) being connected to the bus line (Lout), a gate of the third P-channel transistor (P2) and a gate of the second N-channel transistor (N2) being connected in common to a drain of the first P-channel transistor (P1) and a drain of the first N-channel transistor (N1), a drain of the third P-channel transistor (P2) and a drain of the second N-channel transistor (N2) being connected in common to the bus line (Lout). In particular, back gates (i.e., the N-type well) of the first second and third P-channel transistors (P1, P4 and P2) are all connected to a source of the P-channel transistor (P2), respectively. Therefore, it is possible to prevent unnecessary current from flowing to the supply voltage terminal of the bus hold circuit, even if an output circuit supplied with a supply voltage different from that of the bus hold circuit is connected to the bus line.
摘要:
A transistor circuit apparatus comprises a MOS transistor to be improved, for preventing an avalanche breakdown, the MOS transistor being connected in a channel conductor path provided between one of power supply terminals and a terminal of an output, a separate circuit connected to the output terminal and driven by a voltage from a separate power supply, and a pull-down unit including a second transistor connected between one of said power supply terminals and a back gate of the MOS transistor, the second transistor being turned on with an output node of the separate circuit used as power supply when the MOS transistor remains at a ground potential level with no power supply potential supplied, thereby pulling down the potential level of a back gate node of the MOS transistor to the level of one of the power supply terminals.
摘要:
Either the power-supply potential or a ground potential is applied to a power-supply node through a switch. When a potential higher than the ground potential is applied to an output terminal while the power-supply node is connected to the ground-potential node, the potential of a back gate of a first PMOS transistor incorporated in an output section increases in accordance with the potential of the output terminal, due to a pn-junction provided between the drain and back gate of the first PMOS transistor. At this time, a second PMOS transistor whose source-drain path is connected between the back gate and gate of the first PMOS transistor is turned on, whereby the potential of the back gate of the first PMOS transistor is transferred to the gate thereof.
摘要:
Two terminals of each of transistors (P1, N1) are connected between two terminals (A, B). A body effect compensation circuit (COMP-P1) for the transistor (P1) and a body effect compensation circuit (COMP-N1) for the transistor (N1) are arranged. The back gates of transistors (P1P, P2P) in the circuit (COMP-P1) and transistors (P1N, P2N) in the circuit (COMP-N1) are commonly connected to the back gate of the transistor (P1). The back gates of transistors (N1N, N2N) in the circuit (COMP-N1) and transistors (N1P, N2P) in the circuit (COMP-P1) are commonly connected to the back gate of the transistor (N1). With this structure, in transferring a signal from one terminal (A or B) to the other terminal (B or A) or vice verse, the signal potential is transferred to the back gates of the transistors (P1, N1) at a high speed to increase the signal transfer speed.
摘要:
A transistor circuit comprises a MOS transistor with an open back gate, and control means for controlling a voltage to be applied to the control gate of the MOS transistor, whereby the control means controls the avalanche breakdown voltage of a parasitic bipolar transistor formed by the drain, back gate and source of the MOS transistor.
摘要:
An interface circuit includes first and second MOS transistors of depletion type, first and second switching elements, and a control circuit. The current path of the first MOS transistor is connected between an output node of a MOS circuit formed in a semiconductor substrate and an output terminal and the gate thereof is connected to a power supply. The first switching element is connected between the backgate of the first MOS transistor and a ground terminal. The second switching element and the current path of the second MOS transistor are serially connected between the backgate of the first MOS transistor and the output terminal. The gate of the second MOS transistor is connected to the power supply and the backgate thereof is connected to the backgate of the first MOS transistor. The first and second switching elements are set into complementary states according to an output of the MOS circuit in response to an output signal of the control circuit.
摘要:
This invention discloses a signal output circuit including DC and AC buffers having output nodes commonly connected to a signal output terminal, and an AC buffer control circuit for driving the AC buffer when an output from the DC buffer is changed and for controlling an output from the AC buffer in a high-impedance state when the output from the DC buffer is stationary.