摘要:
PROBLEM TO BE SOLVED: To provide an RF pulse signal generating-switching circuit capable of rapidly falling the wave of an RF pulse signal while maintaining a stable operation.SOLUTION: A drain switching circuit 21 includes n-type first, second and third FETs 211, 212 and 213. Gates of the first and third FETs 211 and 213 are each applied with a control pulse, while the sources are grounded. Drain of the first FET 211 is connected to the gate of the second FET 212, and a drive voltage Vds is applied to the drain of the second FET 212. Source of the second FET 212 is connected to the drain of the third FET 213, with the connection point connected to the drain of a power FET 31. Between the gate and source of the second FET 212 is connected to a capacitor 215 that is for supplying charge for compensating a gate voltage when the second FET 212 transitions from Off to On.
摘要:
PROBLEM TO BE SOLVED: To provide a high-efficiency modulation power supply circuit that suppresses an increase of a device size by reducing an overshoot/undershoot and also improve error amplifier efficiency.SOLUTION: A modulation power supply circuit 100 comprises: a controller 140 that compares an input envelope signal and a threshold in a threshold table 160 at a comparator 150 to generate a switching signal for switching each of the switches 121-123 in a switch section 120; a delay insertion part 200 that monitors the switching signal being input to the switch section 120 and inserts a delay to the switching signal to shift a timing so that each of the switches 121-123 in the switch section 120 does not turn on/off at the same time.
摘要:
PROBLEM TO BE SOLVED: To provide a multistage amplification type class-AB operational amplifier in which an amplification stage is operated stably and a class-AB output stage is operated by a minimum positive-negative power supply voltage corresponding to an output signal level. SOLUTION: A multistage amplification type class-AB operational amplifier includes: an amplification stage where a plurality of amplification units form a multistage configuration; and a class-AB output stage comprised of a bias unit and an output unit. An input signal to the amplification stage is amplified by the plurality of amplification units in order and further output from the output unit of the class-AB output stage as an output signal. An application voltage for amplifying signal output is supplied from the bias unit to the output unit. In such a multistage amplification type class-AB operational amplifier, a positive power supply voltage to be supplied to the amplification stage and a positive power supply voltage to be supplied to the class-AB output stage are different from each other, and a negative power supply voltage to be supplied to the amplification stage and a negative power supply voltage to be supplied to the class-AB output stage are different from each other. COPYRIGHT: (C)2011,JPO&INPIT