Analog multiplying-averaging circuit and wattmeter circuit using

Details Analog multiplying-averaging circuit and wattmeter circuit using Analog multiplying-averaging circuit and wattmeter circuit using

1994-12-12

1995-11-07

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

364841, 327356, G01R 1132, G06G 716

Patent

active

054650445

ABSTRACT:
In an analog multiplying-averaging circuit for detecting very small mean power in a wide band and a wattmeter using the circuit, a first voltage signal is inputted to a base and a second voltage signal is inputted to a collector of one transistor circuit of a first differential amplifier, to supply a power corresponding to the multiplying-averaging of the two input signals to the collector of the transistor circuit. A base and a collector of another transistor circuit of the first amplifier are grounded to extract a DC collector voltage corresponding to junction temperature differences produced between the two transistor circuits from the collector of the other transistor circuit. A second amplifier is provided, which also has two transistor circuits. A base of one transistor circuit of the second differential amplifier is grounded. The second voltage signal is inputted to a collector of the one transistor circuit, and a base and a collector of another transistor circuit of the second amplifier are grounded to also extract a DC collector voltage corresponding to junction temperature differences of the two transistor circuits from the collector of the other transistor circuit of the second amplifier. From the two DC collector voltages, a signal corresponding to the multiplying-averaging of two input signals is obtained.

REFERENCES:
patent: 4156283 (1979-05-01), Gilber
patent: 4454433 (1984-06-01), Welland
patent: 4818934 (1989-04-01), Tamamura
patent: 4920312 (1990-04-01), Maruyama
patent: 5017860 (1991-05-01), Germer et al.
patent: 5151624 (1992-09-01), Stepherr et al.

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