Amplifier structure for low-level voltage measurements

Details Amplifier structure for low-level voltage measurements Amplifier structure for low-level voltage measurements

1976-06-07

1977-09-27

Mullins, James B.

Amplifiers

Involving structure other than that of transformers per se

With shielding means

174 52PE, H03F 100

Patent

active

040514447

ABSTRACT:
A magnetic flowmeter system having a high impedance double ended AC preamplifier stage for amplifying voltages induced in a fluid flowing in and transverse to the field of an AC energized electromagnet. The preamplifier output voltages are amplified in a single-ended AC amplifier. The output voltage of the AC amplifier is demodulated by a phase sensitive detector. The DC output voltage is divided by a DC voltage derived from the AC source of energization for the electromagnet, so a net output voltage results which is free of common mode and quadrature voltages and independent of field fluctuations, but is obtained without feedback to the input of the system.

REFERENCES:
patent: 3390226 (1968-06-01), Beyerlein
patent: 3870968 (1975-03-01), Vosteen et al.

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