Low-noise video preamplifier

Details Low-noise video preamplifier Low-noise video preamplifier

1982-05-13

1984-07-10

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330251, H03F 338

Patent

active

044595522

ABSTRACT:
For reduction of the relative noise amplitude a modulator or chopper stage is provided in front of the input of a video preamplifier and at the preamplifier output balanced demodulators are provided with a subtraction circuit combining their outputs. Preferably the carrier wave used for chopping or modulation is applied to the demodulators for synchronous demodulation, with a phase shifter if necessary in the carrier supplied to the demodulators for compensation of the signal propogation time through the preamplifier.

REFERENCES:
B. Moulds, "Variable Cutoff Filters", IBM Tech. Dis. Bulletin, vol. 7, No. 12, May 1965.
I. Macleod, "On the Bandwidth of Carrier-Type DC Amplifiers", IEEE Transactions on Circuit Theory, vol. CT-17, No. 3, Aug. 1970.

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