Time-frequency multiplexing system for correcting output amplitu

Details Time-frequency multiplexing system for correcting output amplitu Time-frequency multiplexing system for correcting output amplitu

1987-08-31

1990-03-06

Laroche, Eugene R.

Wave transmission lines and networks

Automatically controlled systems

455125, 455192, H03J 704, H03J 706

Patent

active

049069500

ABSTRACT:
An electronic circuit utilizing a parallel tuned resonant circuit and time variant frequency multiplying to eliminate undesired response changes of the tuned circuit due to temperature is disclosed. The electronic circuit illustrated permits accurate measuring of the change of inductance in a parallel tuned circuit where such change of inductance is due to an input parameter to be measured. The inductive component being measured may be located in environmental conditions which include a large variation in ambient temperature. While normally such wide temperature variations may substantially interfere with the measurement of the value of the inductance in question, the disclosed invention provides for compensation of such undesired changes so that the actual change of the inductance can be monitored without interference. The invention utilizes a dual frequency clock oscillator and a time selective system to alternatively select a high or low frequency input to the parallel tuned resonant circuit, and includes two sample and hold components operating in conjunction with the time selected frequency input of the circuit.

REFERENCES:
patent: 2991436 (1961-07-01), Banton
patent: 4257018 (1981-03-01), Masdea et al.
patent: 4272743 (1981-06-01), Evans
patent: 4348770 (1982-09-01), Ito

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