Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1978-10-17
1979-05-15
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 1A, H03B 304
Patent
active
041550501
ABSTRACT:
A loop phase detector circuit in which the phase offset error arising from imperfections in the circuit parameters, inter alia, temperature and power supply voltage, is reduced to a minimum by the circuit arrangement disclosed herein. The phase comparator circuit compares the phase of the output frequency of a voltage to frequency converter with an input reference signal, and provides, in complementary form, a phase comparison error signal and the complement of a phase comparison error signal. Due to temperature and supply voltage fluctuation of the circuit, the phase comparison error signal and the complementary phase comparison error signal may not be symmetrical in amplitude and may contain offset errors not directly related to phase errors. Therefore, the phase comparison error signal is applied to an input of a difference amplifier and the algebraic sum of the phase comparison error signal and the complementary phase comparison signal is applied to the other input terminal of the difference amplifier with the result between the two signals being the control voltage for a voltage control oscillator. There is a resistive network which is used to algebraically sum the phase comparison error signal and the complementary phase comparison signal in line between the phase comparison circuit and the difference amplifier which cross couples the phase comparison error signal with the complementary phase comparison error signal, so that fluctuations due to temperature and power supply voltages are drastically reduced through the algebraic summation of the signals.
Kominski John
Rockwell International Corporation
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