Accession Number:

AD0607745

Title:

SOME ASPECTS OF TRANSISTOR DEMODULATORS,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE INSTRUMENTATION LAB

Personal Author(s):

• RASCH,Philip J.

Report Date:

1962-02-01

Pagination or Media Count:

38.0

Abstract:

In order to present the transistor demodulator, the necessary theory of transistor switches is reviewed. Comparing it to an ideal switch, the method of operation of a transistor switch is presented, and the deviations from the ideal are developed. Using an equivalent circuit for the transistor in the saturated and cutoff regions, it is shown that the offset voltage and current of the switch is lowest in the inverted connection. The transistor demodulator is presented as a phase-sensitive a-c to d-c converter. In order to prove that the circuit operates for all polarities and all permissible levels of input signal, a complete analysis of the switching cycle is presented. From this study, the maximum back voltages across the junctions are determined. A practical demodulator is presented, and performance data on this circuit is given. Author

Descriptors:

• TRANSISTORS
• DEMODULATORS
• CIRCUITS
• OPERATION
• SWITCHING CIRCUITS
• ELECTRONIC SWITCHES
• PERFORMANCE(ENGINEERING)
• VOLTAGE

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE