摘要:
An object is to provide an antenna switch semiconductor integrated circuit which reduces a consumption current. To this end, of two control input signals which are fed to a logic circuit which controls turning on and off of a plurality of switching FETs, a control input signal for switching between a sending mode and a receiving mode is fed to an oscillation circuit, thereby making the oscillation circuit operate only during the sending mode under which the logic circuit needs a high voltage. A voltage raising circuit accordingly operates, whereby a raised voltage is supplied to the logic circuit. During the receiving mode, the oscillation circuit stops, and the voltage raising circuit stops. With a switch turned on using the logic circuit, a power source voltage is supplied directly to the logic circuit when the voltage raising circuit is not in operation. This shortens the operation time of the voltage raising circuit and reduces the consumption current.
摘要:
A diode logic circuit which can select a high voltage from among the voltages of a number of control voltage input terminals using a number of diodes made of Schottky junctions is integrally formed on a compound semiconductor substrate on which MESFET stages for switching and for securing isolations have been formed. In addition, the MESFET stages for switching are controlled by the voltages of the number of control voltage input terminals and the MESFET stages for securing isolations are controlled by the OR voltage that is outputted from the diode logic circuit.
摘要:
An output voltage Vout from a boost processing section 20 is divided by resistances 41 and 42, and a resultant divided output voltage Va is input to one of two input terminals of a comparator 45. A reference voltage Vb obtained by dividing a voltage Vcc by resistances 43 and 44 is input to the other input terminal of the comparator 45. The comparator 45 compares the divided output voltage Va with the reference voltage Vb, and when the divided output voltage Va is lower, outputs a HIGH voltage, and when the divided output voltage Va is higher, outputs a LOW voltage. Thereby, an signal oscillating section 10 performs oscillation at a radio frequency (an N-type CMOS FET 18 is in the OFF state) when the output voltage Vout does not exceed a threshold value determined by the reference voltage Vb, and performs oscillation at a low frequency (the N-type CMOS FET 18 is in the ON state) when the output voltage Vout exceeds the threshold value.
摘要翻译:来自升压处理部分20的输出电压Vout被电阻41和42分压,并且所得到的分压输出电压Va被输入到比较器45的两个输入端之一。通过将电压Vcc除以电阻获得的参考电压Vb 43和44被输入到比较器45的另一个输入端。比较器45将分压后的输出电压Va与参考电压Vb进行比较,当分压后的输出电压Va较低时,输出高电压,分压输出 电压Va较高,输出低电压。 因此,当输出电压Vout不超过由参考电压Vb确定的阈值时,信号振荡部10在射频(N型CMOS FET 18处于截止状态)下进行振荡,并且在 当输出电压Vout超过阈值时,低频(N型CMOS FET 18处于导通状态)。
摘要:
The invention is directed to the provision of a two-input, four-output high frequency switch circuit that can prevent the occurrence of in-band ripples of insertion loss in an ON path. The high frequency switch circuit is constructed from six field effect transistors, and a signal is passed through a selected one of signal paths in the two-input, four-output high frequency signal switch having a total of six signal terminals, wherein four additional field effect transistors, each of which, when ON, provides a characteristic impedance matched to the characteristic impedance of an external circuit, are respectively connected between ground and the signal paths leading to the remaining four signal terminals to which the signal is not passed and which therefore become open ends. When the signal is not passed, the respective four field effect transistors are put in operation, thereby eliminating the effects of standing waves occurring on the respective paths leading to the four signal terminals acting as open ends.
摘要:
A diode logic circuit which can select a high voltage from among the voltages of a number of control voltage input terminals using a number of diodes made of Schottky junctions is integrally formed on a compound semiconductor substrate on which MESFET stages for switching and for securing isolations have been formed. In addition, the MESFET stages for switching are controlled by the voltages of the number of control voltage input terminals and the MESFET stages for securing isolations are controlled by the OR voltage that is outputted from the diode logic circuit.
摘要:
In a high-frequency switch circuit having a booster circuit and a voltage switch circuit for ON/OFF control of the booster circuit, the voltage switch circuit has a means for gradually dropping the gate input voltage and the drain/source input voltage of a series of FETs over a voltage drop time of 10 μsec or more at the time of switching from a boosted voltage to a non-boosted voltage.
摘要:
One end of each of five resistors is connected to each of the two ends and the respective intermediate points of a cascade of four depression-type FETs, while the other ends of the five resistors are provided with a predetermined voltage. This configuration fixes the source-drain potential of the four FETs. This fixing of the source-drain potential of the FETs permits stable application of a bias voltage for turning ON the FETs between the gate and the source each FET, so as to ensure the ON-OFF switching of the FETs.
摘要:
A semiconductor device using resistive random access memory (ReRAM) elements and having improved tamper resistance is provided. The semiconductor device is provided with a unit cell which stores one bit of cell data and a control circuit. The unit cell includes n ReRAM elements (n being an integer of 2 or larger). At least one of the ReRAM elements is an effective element where the cell data is recorded. In reading the cell data, the control circuit at least selects the effective element and reads data recorded thereon as the cell data.
摘要:
An antifuse comprised of an NMOS transistor or an NMOS capacitor includes a first terminal coupled to a gate electrode, a second terminal coupled to a diffusion layer, and a gate insulating film interposed between the gate electrode and the diffusion layer. A programming circuit includes a first programming circuit which has first current drive capability and which performs first programming operation and a second programming circuit which has second current drive capability larger than the first current drive capability and which performs second programming operation to follow the first programming operation. In the first programming operation, the first programming circuit breaks down the gate insulating film by applying a first programming voltage between the first terminal and the second terminal. In the second programming operation, the second programming circuit applies a second programming voltage lower than the first programming voltage between the first terminal and the second terminal.
摘要:
A first semiconductor device is formed over a substrate and includes a first insulation film, a first electrode, and a first diffusion layer. A second semiconductor device is formed over a substrate and includes a second insulation film, a second electrode, and a second diffusion layer. The second electrode is coupled to the first electrode. A control transistor allows one of a source and a drain to be coupled to the first electrode and the second electrode, allows the other one of the source and the drain to be coupled to a bit line, and allows a gate electrode to be coupled to a word line. A first potential control line is coupled to the first diffusion layer and controls a potential of the first diffusion layer. A second potential control line is coupled to the second diffusion layer and controls a potential of the second diffusion layer.