Generation of vectors

Details Generation of vectors Generation of vectors

1983-02-07

1985-04-09

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

340347DA, 364520, G06F 313, H03K 1302

Patent

active

045104328

ABSTRACT:
A vector generator includes a linear charge pump in the form of a DAC with a constant but variable current output that can charge a capacitor connected between the output and one of the input terminals of an operational amplifier. A second constant current generator having an output current one-half that of the maximum output current of the DAC and of opposite polarity also is provided for charging the capacitor, the constant current generators being so connected to the capacitor that it can be charged either positively or negatively. A switching network controls whether the capacitor is charging or not depending on the state of the switching network. A second DAC with a constant but variable output voltage is provided and produces an output indicative of the coordinate of the vector to be drawn. The voltage on the capacitor is compared to the output voltage of the second DAC, and, when they are equal, a control signal is produced that changes the state of the switch to terminate charging of the capacitor.

REFERENCES:
patent: 3681773 (1972-08-01), Russell et al.
patent: 3918046 (1975-11-01), Rivers
patent: 4283765 (1981-08-01), Rieger
patent: 4410879 (1983-10-01), Gumm
patent: 4430641 (1984-02-01), Baur

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