Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
1994-12-07
1996-08-20
Mis, David
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
331 36C, 331116FE, 331158, 331173, 331177V, H03B 504, H03B 506, H03B 536, H03L 102
Patent
active
055482520
ABSTRACT:
A digital control system such as a digital temperature compensated crystal oscillator (DTCXO) system is arranged to offer superior oscillating performance with reduced size and cost. For example, to reduce the memory capacity, a memory 31 receives upper 6 bits of temperature data, and a decoder 32 calculates temperature compensation data from lower 4 bits and output data from the memory (FIGS. 1-11). For a one-chip configuration and low power consumption, a MOS type Colpitts oscillator (FIG. 16) is provided with a circuit for adjusting the source resistance of the MOS. For size reduction and fine frequency adjustment, a DTCXO is provided with sections such as an adder 341, an up-down counter 342 and an auxiliary frequency control section (AFC) 332 (FIGS. 20, 21, 24 and 25). An adding section 415 is provided between a D/A converting section 414 and a capacitance varying section 416 to obtain superior linearity with respect to a control voltage and quality of offset.
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Patent Abstracts of Japan, vol. 016, No. 326, (E-1235), Jul. 16, 1992.
Hayashi Mutsuo
Matsubayashi Masaru
Matsui Takashi
Matsumoto Kazunari
Tsuchiya Chikara
Fujitsu Limited
Kabushiki Kaisha Meidensha
Mis David
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