DESIGN CRITERIA FOR LOW-LEVEL SECOND-HARMONIC MAGNETIC MODULATORS
Technical rept. no. 1
MASSACHUSETTS INST OF TECH CAMBRIDGE SERVOMECHANISMS LAB
Pagination or Media Count:
Magnetic modulators were studied as devices to circumvent the drift and noise problems in dc amplification by converting low-level, LF signals to AM, suppressed-carrier outputs which permit conventional ac amplification. Mathematical analyses of a modulator with a high-impedance source and signal and a voltage output are presented for 1 no-signal operation, 2 signal operation, 3 variation of output with excitation amplitude, 4 time-constant, 5 power gain, and 6 figure of merit. Experiments to determine configuration, excitation, output, core design, and circuitry for a 2-core, current-excited modulator indicated that the correlation between analytical and experimental work was sufficient to permit the use of the analysis as a design basis for second-harmonic magnetic modulators.
- Electricity and Magnetism