H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/22
H03F 3/45 (2006.01)
Patent
CA 1078931
ABSTRACT OF THE DISCLOSURE An integrated circuit direct coupled amplifier capable of operating from a single battery cell, has: a differential amplifier input stage having an input transistor and a second transistor; an intermediate gain stage; and an output stage. Signal is fed back from the output stage to the base of the second transistor of the differential amplifier, through a negative feedback circuit. Current sources are connected as loads in the collector circuits of the input transistor of the differential amplifier and the transistor of the intermediate gain stage. The current sources are biased by separate bias sources, to improve stability. The bias source for the intermediate gain stage current source also biases a current source for the feedback circuit. A starting circuit is connected to the bias source for the intermediate gain stage and provides self starting for the current sources. Frequency compensation elements are located in the base-collector circuit of the intermediate gain stage transistor to stabilize the amplifier, and a gain control resistor connected to the base of the second transistor of the differential stage operates by varying the negative feedback in the amplifier.
245807
Barber Herbert D.
Salter Gary C.
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