Abstract The signal phase detector according to this invention comprises a differential amplifier with a couple of transistors, a first transistor inserted between the emitters of the couple of transistors and a first point of reference potential, a second transistor inserted between the output terminal of one difference the transistors of the differential amplifier and a second point of reference potential, a third transistor connected to the second point of reference potential, and a fourth transistor connected in series with the third transistor and between the output terminal of the third transistor and the output terminal of the other of the transistors of the differential amplifier. A reference signal is applied to the base of the first transistor, while a signal to be compared is applied to the base of one of the transistors of the differential amplifier, so that an output signal corresponding to the phase differential between the two signals is obtained from the output terminal of the other of the transistors of the differential amplifier.
A phase detecting circuit comprising a differential amplifier with a pair of transistors, a first transistor with its collector connected to the emitters of said pair of transistors and with its emitter connected to a first point of reference potential, a second transistor with its collector connected to the collector of one of the transistors of said differential amplifier and with its emitter connected to a second point of reference potential, a third transistor with its emitter connected to said second point of reference potential and with its base connected to the base of said second transistor, the base and collector of said third transistor being short-circuited, a fourth transistor with its emitter connected to the collector of said third transistor and with its base connected to the collector of said second transistor, the collector of said fourth transistor being connected to the collector of the other said transiStors of said differential amplifier, means for supplying a reference signal to the base of said first transistor, means for applying a signal to be compared with said reference signal to the base of a selected one of the one and the other of said transistors of said differential amplifier, and means of collecting an output signal from the collector of the nonselected one of the one and the other of said transistors of said differential amplifier.
Claim 2
Dependent Claim
225 words
A phase detecting circuit comprising a differential amplifier with a pair of transistors, a first transistor with its collector connected to the emitters of said pair of transistors and with its emitter connected to a first point of reference potential, a second transistor with its collector connected to the collector of one of the transistors of said differential amplifier and with its emitter connected to a second point of reference potential, a third transistor with its emitter connected to said second point of reference potential and with its base connected to the base of said second transistor, the base and collector of said third transistor being short-circuited, a fourth transistor with its emitter connected to the collector of said third transistor and with its base connected to the collector of said second transistor, the collector of said fourth transistor being connected to the collector of the other said transiStors of said differential amplifier, means for supplying a reference signal to the base of said first transistor, means for applying a signal to be compared with said reference signal to the base of a selected one of the one and the other of said transistors of said differential amplifier, and means of collecting an output signal from the collector of the nonselected one of the one and the other of said transistors of said differential amplifier.
Claim 3
Dependent Claim
34 words
A phase detecting circuit according to claim 1, further comprising means for applying a bias voltage to the base of one of the one and the other of said transistors of said differential amplifier.