Volentine Francos, PLLC
Voltage-controlled oscillator having short synchronous pull-in time
A voltage-controlled oscillator comprises a control terminal applied to a control voltage, first and second output terminals, first and second ring oscillators, first and second output buffer circuits and a latch circuit. Each of the first and second ring oscillators includes an odd number of inverting amplifier circuits connected in series and a transfer gate circuit connected between the inverting amplifier circuits and a resistive element connected in parallel to the transfer transistor. The transfer gate circuit includes a transfer transistor connected between the inverting amplifier circuits. The transfer gate circuit has a control terminal connected to the control terminal. Each of the first and second output buffer circuits has an input connected to the first or second ring oscillator and an output connected to the first or second output terminal. The latch circuit is connected to the first and second ring oscillators. The latch circuit controls the first and second ring oscillators so as to output complement oscillation signals.
Oki Electric Industry Co., Ltd.
H
H03K
inventional
Hiroyuki Kazuo
Yamada Sudou