Modular low noise preamplifier

Details Modular low noise preamplifier Modular low noise preamplifier

1978-07-06

1979-11-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including combined diverse-type semiconductor device

330293, 330298, 330311, H03F 316

Patent

active

041745035

ABSTRACT:
Disclosed is a low noise amplifier capable of handling large signals without significant distortion and which is particularly useful as the first electronic stage in hydrophone array systems utilizing piezoelectric sensor elements. The amplifier comprises three stages. The first stage uses an input field effect transistor (FET), which is protected against overload by very low leakage current diodes, and which acts as a voltage-to-current converter. The second stage comprises a junction transistor connected in a common emitter configuration which acts as a current-to-voltage converter. The third stage is a further junction transistor connected as an emitter follower. The overall gain of the amplifier is controlled by a feedback connection from the third stage to the first stage. The second and third stages are powered by a bipolar power supply. The second stage junction transistor has its emitter connected to the positive supply voltage by a pair of diodes forward biased by the supply voltage to provide low distortion and fast overload recovery. The third stage includes a second field effect transistor (FET), in series with the junction transistor of the third stage, which allows enhanced output drive capability. Resistors are connected in series with the base and collector of the third stage junction transistor to provide output short circuit protection.

REFERENCES:
patent: 3309617 (1967-03-01), Lancaster et al.
patent: 3927383 (1975-12-01), Fjarlie et al.
Ridler, "Tape Pre-Amplifier Using F.E.T.", Wireless World, Sep. 1967, pp. 433-434.

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