High-accuracy sine-function generator

Details High-accuracy sine-function generator High-accuracy sine-function generator

1982-02-01

1984-10-02

Ruggiero, Joseph F.

Boots, shoes, and leggings

307498, 364851, G06G 722

Patent

active

044751699

ABSTRACT:
A sine-function generator comprising a plurality of bipolar transistors with their collectors connected to a pair of output terminals in alternating antiphase and their emitters connected in common to a single current source. The bases of the transistors are connected to respective nodal points of a base-bias network comprising a series-connected string of equal resistors. Current sources supply equal currents to the network nodal points to develop base voltages at those points according to a predetermined distribution pattern establishing a peak voltage along a line representing the nodal sequence. An input signal applied to the ends of the resistor string controls the location of this voltage peak along the nodal line, thereby controlling the current flow through the transistors in such a way that the net differential output current is proportional to the sine of the angle represented by the input signal. A ladder-type base-bias network also is disclosed.

REFERENCES:
patent: 3868680 (1975-02-01), Rhodes
patent: 3984672 (1976-10-01), Jones
patent: 4164729 (1979-08-01), Simon et al.
Gilbert, "Monolithic Analog Read-only Memory for Character Generation" IEEE JSSC, vol. SC-6, No. 1, Feb. 1971.

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