Boots – shoes – and leggings
Patent
1989-08-14
1992-05-19
Smith, Jerry
Boots, shoes, and leggings
307498, 328160, G06G 7163, G06J 100
Patent
active
051154099
ABSTRACT:
A four-quadrant multiplier based on a Gilbert cell is utilized to multiply several signals by a similar signal. The transistors in two pairs of coupled differential amplifiers of one input terminal of the inner multiplier that is activated like a Gilbert cell by way of a diode-and-transistor section have several emitters. Each pair of emitters in the right and the left branch of the miltiplier can be oppositely activated by way of a source of variable current or by way of a series of a transistor and a source of current. To process square-wave signals, the source of variable current is a source that can be engaged and disengaged by I.sup.2 L gates.
REFERENCES:
patent: 3309508 (1967-03-01), Witt
patent: 3670155 (1972-06-01), Grobert
patent: 3689752 (1972-09-01), Gilbert
patent: 3838262 (1974-09-01), van de Plassche
patent: 4071777 (1978-01-01), Herrmann
patent: 4586155 (1986-04-01), Gilbert
patent: 4764892 (1988-08-01), Thomas
"Advanced Electronic Circuits", by Ulrich Tietze et al., 4th Edition; Springer-Verlag New York Heidelberg Berlin, 1980, pp. 227-228.
"Halbleiter-Schaltungstechnik", by Ulrich Tietze et al.; 4th Edition; Berlin, Heidelberg, New York; Springer; 1978, pp. 64-65.
"Analog Signal Processing Components", vol. 1; pp. 6-9 to 6-16; Analog Devices, Inc. Data-Acquisition Databook 1984.
Morris Jeffrey P.
Siemens Aktiengesellschaft
Smith Jerry
Trammell Jim
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