Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-07-19
1991-01-08
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328145, G01K 1510, G06G 712
Patent
active
049838636
ABSTRACT:
A logarithmic amplification circuit is provided with a first transistor 10 having its collector supplied with a first input current, a second transistor 11 having its collector supplied with a second input current and being differentially connected to the first transistor, a comparing circuit 13 for receiving the first and second input currents to supply a signal corresponding to a difference between the two input currents to a base of the second transistor, and first and second constant current circuits 21 and 25 for supplying respective collectors of the first and the second transistors with equivalent compensating current. An output voltage corresponding to a difference between a logarithmically amplified value of the first input current and a logarithmically amplified value of the second input current can be obtained.
REFERENCES:
patent: 3369128 (1968-02-01), Pearlman
patent: 3811088 (1974-05-01), Hekimian
patent: 4080075 (1978-03-01), Berg
patent: 4341962 (1982-07-01), Buff
patent: 4716306 (1987-12-01), Sato et al.
patent: 4737668 (1988-04-01), Blet et al.
"Practical Technique of Operational Amplifier", p. 150, issued Oct. 10, 1980.
Miller Stanley D.
Sanyo Electric Co,. Ltd.
Tran Toan
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