High input impedance amplifier circuit having temperature stable

Details High input impedance amplifier circuit having temperature stable High input impedance amplifier circuit having temperature stable

1975-08-18

1977-08-16

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 25, 330 30D, H03F 345

Patent

active

040428869

ABSTRACT:
An amplifier configuration is disclosed which utilizes a resistive, positive feedback network to develop a high input impedance. The amplifier, which is suitable for manufacture in monolithic integrated circuit form, includes a pair of differential transistors which are coupled to a current supply that provides a current having a predetermined temperature coefficient. A resistor, which is connected between the emitters of the differential transistors, develops either a temperature stable offset voltage or an offset voltage having a desired temperature coefficient in response to the current. A negative feedback circuit facilitates control of the bias voltages for the pair of differential transistors. Temperature stable quiescent input and output voltage levels are derived from the offset voltage through the feedback network.

REFERENCES:
patent: 2852625 (1958-09-01), Nunt
patent: 3188576 (1965-06-01), Lewis
patent: 3526847 (1970-09-01), Campbell
patent: 3800239 (1974-03-01), Callahan
patent: 3914704 (1975-10-01), Craft

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