Oscillator

Details Oscillator Oscillator

2007-11-27

2007-11-27

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C331S015000, C331S016000

Reexamination Certificate

active

11346149

ABSTRACT:
In the current-controlled oscillator performing an oscillation frequency control by using a differential amplifier circuit, resistors are inserted to each current path of a differential pair of the differential amplifier circuit, and thereby an inclination of output currents Ia, Ib of a differential pair is small in the linear line region. Further, by setting a reference voltage applied to a base of a transistor of one side of the differential pair lowly, the linear region is shifted to low voltage side, and thereby a saturation region of the low voltage side is not occurred. Moreover, when a comparison result of a phase of an output signal of the current-controlled oscillation circuit and a reference signal is converted to an oscillation frequency control voltage Vtune, by limiting an upper limit voltage of the Vtuneby an output of a regulator in stead of a positive voltage power source Vccof common circuit, the Vtunedoes not move to a saturation region upper than the linear region. According to the current-controlled oscillator, it is possible to prevent deterioration of a phase noise characteristic or deadlock caused by an inclination or a width of the linear region of the output characteristic of the differential amplifier circuit.

REFERENCES:
patent: 5392003 (1995-02-01), Nag et al.
patent: 2001/0015677 (2001-08-01), Choi

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