Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1984-12-12
1986-09-30
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
307498, 307516, 332 16T, 332 31T, H03C 154, H03B 1910, H03D 1300
Patent
active
046149112
ABSTRACT:
A multiplier circuit is equipped with first and second differential amplifier circuits and a load circuit. These differential amplifier circuits are comprised of differential pairs of transistors for amplifying a first signal and outputting mutually opposed differential output signals. A switching circuit is comprised of two groups of differential pairs of transistors. In order to increase the dynamic range of the output signals, this switching circuit controls the base voltage of the differential amplifier pair of transistors, which are constructed of the first and second differential amplifier circuits, and alternately operates these first and second differential amplifier circuits. Accordingly, an opposing signal of the output signals of these first and second differential amplifier circuits is supplied to the load circuit. It is, therefore, possible to obtain a product signal of the first and second signals from the output terminals, which are connected to the node of the load circuit and the first and second differential amplifier circuits.
REFERENCES:
patent: 3550040 (1970-12-01), Sinusas
Analog Integrated Circuits--Operational Amplifiers and Analog Multipliers--by Miklos Herpy--May 7, 1980--pp. 438-451.
Grimm Siegfried H.
Kabushiki Kaisha Toshiba
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