Fast switching drive circuit for a ferri-resonant oscillator

Details Fast switching drive circuit for a ferri-resonant oscillator Fast switching drive circuit for a ferri-resonant oscillator

1990-10-15

1991-10-08

Grimm, Siegfried H.

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331 96, 331179, H03B 518

Patent

active

050561448

ABSTRACT:
Apparatus for allowing low noise and fast frequency switching of a ferri-resonant oscillator, such as YIG, that uses a coil to control output signal frequency by current level. The apparatus positions an active filter in parallel with the oscillator coil, which can be set to one of two impedance levels. A low impedance level provides low pass filtering of the current to the oscillator coil for low noise operation. A second high impedance level allows fast settling of transients during frequency changes. Once current levels have stabilized, the active filter can then be switched to low impedance mode without creating a significant transient. This facilitates fast frequency switching.

REFERENCES:
patent: 4536722 (1985-08-01), Kaye et al.
patent: 4581594 (1986-04-01), Kennedy

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