Battery powered magnetic pen having oscillator with improved eff

Details Battery powered magnetic pen having oscillator with improved eff Battery powered magnetic pen having oscillator with improved eff

1993-01-11

1994-09-06

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331 68, 331173, 331179, 345179, H03B 512

Patent

active

053451970

ABSTRACT:
A battery-powered, magnetic-pen oscillator includes a circuit having a first transistor arranged in a common emitter configuration. A feedback loop includes a transformer and the transistor that produce a loop phase shift of zero degrees and a loop gain of one to cause oscillation, and additionally creates the magnetic field emitted by the pen. A second transistor provides current mirror biasing for the first transistor and determines the amount of current flowing through the first transistor.

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patent: 4404497 (1983-09-01), Takematsu
patent: 4800323 (1989-01-01), Sikora

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