Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1979-06-27
1981-05-26
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 25, H03L 708, H03L 714
Patent
active
042700930
ABSTRACT:
An active filter used for the loop filter of a phase-lock loop has one input to the operational amplifier thereof connected to receive the output from a phase detector, and has the non-inverting input connected to receive a control signal from an override signal generator. Under normal operating conditions, the output from the override signal generator is such that it does not affect operation of the active filter and the filter operates as a standard loop filter. During abnormal operating conditions the output signal from the override signal generator is of such magnitude that it causes the operational amplifier and, hence, the filter to output the maximum voltage +V. The filter output is connected to one end of a pair of serially connected resistors which have the node connected to the control voltage input of the voltage control oscillator. The other end of the serially connected resistors is connected to the collector of a transistor. The emitter of the transistor is connected to a reference voltage -V and the base is connected through a bias circuit to the output of the override signal generator. The presence of the override signal causes the transistor to conduct thus, connecting the serially connected resistors between +V and -V. The value of the serially connected resistors are selected so that the node voltage supplies a predetermined value of control voltage to the control input of the VCO to set the predetermined frequency.
REFERENCES:
patent: 3223943 (1965-12-01), Dumaire et al.
patent: 3882412 (1975-05-01), Apple, Jr.
patent: 4061979 (1977-12-01), Walker et al.
Cool Leonard R.
Grimm Siegfried H.
GTE Automatic Electric Laboratories Incorporated
Westin Edward P.
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