DC isolated differential oscillator having floating capacitor

Details DC isolated differential oscillator having floating capacitor DC isolated differential oscillator having floating capacitor

1995-09-13

1997-02-04

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

330252, 331143, H03K 30231, H03F 345

Patent

active

056002831

ABSTRACT:
An oscillator includes a small on-chip floating capacitor having equal parasitic leakages on each of its two plates. The oscillator is fully differential and, being responsive only to differential signals, ignores common mode parasitic leakages of the capacitor. This feature allows for a minimizing of the size of the capacitor as well as enabling the oscillator to operate on purely DC currents which, in turn, allows the output state of the oscillator to toggle without creating current spikes on the supplies. By eliminating these spikes, the oscillator does not suffer from substrate crosstalk problems and thus may be used in mixed signal applications without perturbing the operation of sensitive analog circuitry.

REFERENCES:
patent: 4362999 (1982-12-01), Sauer
patent: 4494088 (1985-01-01), Goutowski et a l.
patent: 4871985 (1989-10-01), Sempel

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