摘要:
PROBLEM TO BE SOLVED: To provide a fully-differential amplifier capable of easily setting a power supply voltage VDD low while maintaining a signal amplitude, or expanding an amplitude of an output signal without increasing the power supply voltage VDD. SOLUTION: A fully-differential amplifier includes a voltage-current conversion unit C100, a first current-voltage conversion unit C101, and a second current-voltage conversion unit C102. A resistant element R100 included in the voltage-current conversion unit C100 and a resistant element R102 included in the first current-voltage conversion unit C101, and a resistant element R101 included in the voltage-current conversion unit C100 and a resistant element R103 included in the second current-voltage conversion unit C102 are connected in parallel with each other between a source terminal of a forward-phase input transistor P100 and a power supply terminal, and between a source terminal of an inverting input transistor P101 and the power supply terminal, respectively. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To increase operation speed and reduce power consumption in a circuit using an SOI-type MOS transistor. SOLUTION: In a plurality of MOS transistors of an SOI structure, body floating, a fixed body voltage, and a variable body voltage are combined. The body floating, body fixed voltage, and variable body bias may be adopted for cases where high-speed operation is expected in a logical circuit mainly composed of switching operation while an operating power supply is at a relatively low voltage, the kink phenomenon of current/voltage characteristics is hated essentially as in an analog-based circuit, and high-speed operation is required in an active state and low power consumption is required in a standby state as in a logical circuit, respectively. By combining the body floating, fixed body voltage, and variable body voltage transistors, an accurate body bias can be adopted according to the functions and configurations of the circuit for high-speed operation and low power consumption. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a vacuum tube circuit capable of performing amplification at a low voltage. SOLUTION: A heater 25 emits electrons. Since a lower voltage than an ordinary voltage is supplied to the heater 25, the amount of emitted electrons from the heater 25 is less than an ordinary amount. Since a positive voltage is applied to a grid 23, many of the emitted electrons arrive in the grid 23 before the emitted electrons reach a plate 21. As a result, a current Ig flows through a resistor (Rg1) and a vacuum tube 20 amplifies an input signal from a signal source 10. COPYRIGHT: (C)2004,JPO
摘要:
PROBLEM TO BE SOLVED: To obtain a voltage follower available for a wider voltage range. SOLUTION: The voltage follower includes a first field effect transistor (FET) MN1 whose gate forms an input of the voltage follower, and a second FET MN2 connected to its gate with a drain forming an output of the voltage follower. Sources of MN1 and MN2 are mutually connected and connected to a drain of a third FET MN3 which operates as a current source, and a predetermined bias voltage is applied to its gate. Further, the voltage follower utilizes a fourth FET MN4 whose source-drain path is formed as a circuit between the output of the voltage follower and the drain of the third FET MN3, and whose gate is connected to the gate of the third FET MN3. The voltage follower according to the invention includes the wider voltage range wherein the voltage follower is available, and may be used while being incorporated in an amplitude transit modulated ASK demodulator to be operated with a small supply voltage particularly. COPYRIGHT: (C)2004,JPO