Oscillation circuit having a current-controlled phase shift circ

Details Oscillation circuit having a current-controlled phase shift circ Oscillation circuit having a current-controlled phase shift circ

1994-12-06

1996-01-16

Grimm, Siegfried H.

Oscillators

Phase shift type

327243, 327248, 327250, 327252, 331158, 331177R, H03B 532

Patent

active

054851289

ABSTRACT:
An oscillator circuit including a current-controlled phase shift circuit and a feedback circuit including a quartz resonator is capable of varying the oscillation frequency in accordance with control current signals. A phase shift circuit included in the current-controlled phase shift circuit includes a first low-pass filter including a resistor and a capacitor, a first buffer amplifier, a second low-pass filter including a resistor and a capacitor, and a second buffer amplifier. The phase shift circuit has a significant gain at any frequency for oscillation. Especially an oscillation circuit implemented by an integrated circuit satisfies the suitable condition in which relative value of resistances and capacitances do not vary.

REFERENCES:
patent: 4733200 (1988-03-01), Ecklund et al.
patent: 5115212 (1992-05-01), Fenk et al.

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