Oscillation circuit

A circuit comprising an amplifier having a first transistor which has a first load transistor connected to a collector thereof, a second transistor which has a second load transistor connected to a collector thereof, means for transmitting a collector output of said first transistor to a base of said first transistor, means for transmitting a collector output of said first transistor to a base of said second transistor, an input terminal connected to a base of said first transistor, and a first output terminal connected to a collector of said second transistor, further comprising a capacitive element which is connected between said input terminal and said first output terminal, so that a collector output of said second transistor is fed back to a base of said first transistor so that said circuit operates as an oscillator, wherein means is provided for controlling a collector current of said second load transistor, and said collector current of said second load transistor and a collector current of said second transistor are made substantially equal to shorten the oscillator start-up time.

An oscillation circuit comprising two circuits which are connected in parallel, each of which includes a first transistor having a first load transistor connected to a collector thereof, a second transistor having a second load transistor connected to a collector thereof, means for transmitting a collector output of said first transistor to a base of said first transistor, means for transmitting a collector output of said first transistor to a base of said second transistor, and a capacitive element connected between said collector of said second transistor and said base of said first transistor of one of said parallel circuits for feeding back an output of said second transistor to said first transistor, wherein said one of said parallel circuits is employed as an active circuit and the other as a biasing circuit, the collector output of said second transistor of said biasing circuit being transmitted to the collector of said second transistor of said active circuit and further wherein current gains of said first transistor and said second transistor are made different, thereby to make a collector current of said second transistor and a collector current of said second load transistor substantially equal, thereby to shorten the oscillator start-up time.

An oscillation circuit comprising two circuits which are connected in parallel, each of which includes a first transistor having a first load transistor connected to a collector thereof, a second transistor having a second load transistor connected to a collector thereof, means for transmitting a collector output of said first transistor to a base of said first transistor, means for transmitting a collector output of said first transistor to a base of said second transistor, and a capacitive element connected between said collector of said second transistor and said base of said first transistor of one of said parallel circuits for feeding back an output of said second transistor to said first transistor, wherein said one of said parallel circuits is employed as an active circuit and the other as a biasing circuit, the collector output of said second transistor of said biasing circuit being transmitted to the collector of said second transistor of said active circuit wherein means is provided for controlling a collector current of said second load transistor, and said collector current of said second load transistor and a collector current of said second transistor are made substantially equal to shorten the oscillator start-up time.