Hydrophone pre-amplifier with self-calibration

Details Hydrophone pre-amplifier with self-calibration Hydrophone pre-amplifier with self-calibration

1986-03-28

1987-08-25

Mullins, James B.

Amplifiers

With amplifier condition indicating or testing means

330260, 330295, 330305, 330306, 330308, 367 13, H03F 345

Patent

active

046895787

ABSTRACT:
A differential charge amplifier design for a hydrophone pre-amplifier inces a calibration circuit for in situ measurement of the hydrophone/pre-amplifier gain. The hydrophone signal is input to a pair of amplifier stages which form a balanced differential input charge amplifier. The signal from the input charge amplifier is amplified by a second pre-amplifier stage and then passed to a balanced output cable driver. The calibration circuit is enabled by an external signal to inject a calibration signal into the input charge amplifier front end.

REFERENCES:
patent: 3260947 (1963-11-01), Dorsman
patent: 3757288 (1973-09-01), Morin
patent: 4166270 (1979-08-01), Brastins et al.
patent: 4213099 (1980-07-01), Brown
patent: 4241428 (1980-12-01), Berni et al.
patent: 4242741 (1980-12-01), Parrish
patent: 4276619 (1981-06-01), Rickenbacker

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