Oscillators – Solid state active element oscillator – Transistors
Patent
1997-05-22
1998-09-08
Mis, David
Oscillators
Solid state active element oscillator
Transistors
331 36C, 331158, 331175, 331179, 331182, 331 44, H03B 536, H03L 7099
Patent
active
058050299
ABSTRACT:
The invention relates to a digitally adjustable crystal oscillator having a quartz crystal and a monolithic integrated oscillator circuit including a series combination of a first frequency-adjusting capacitor C1 and a second frequency-adjusting capacitor C2 connected in parallel with the quartz crystal and comprising parallel-connected first capacitance stages and parallel-connected second capacitance stages, respectively, and an inverter circuit connected in parallel with the quartz crystal and comprising a feedback resistor R.sub.K, the output of the innverter circuit being connected to a load resistor. The inverter circuit comprises parallel-connected inverter stages, and switching elements are provided within the inverter stages and cqapacitor stages in such a way that a respective one of the inverter stages as well as a first capacitance stage C.sub.1i and a second capacitance stage C.sub.2i are switchable into or out of circuit by means of a control signal I.sub.i.
REFERENCES:
patent: 4814640 (1989-03-01), Miyake
patent: 5142251 (1992-08-01), Boomer
patent: 5162746 (1992-11-01), Ghoshal
patent: 5446420 (1995-08-01), Westwick
Kuboki, et al., Design Considerations for Low-Voltage Crystal Oscillator Circuit in a 1.8-V Single Chip Microprocessor, IEICE Trans. Electron, vol. E76-C, No. 5, pp. 701-707, May 1993.
Patent Abstracts of Japan, vol. 004, No. 59 (E-009) 2 May 1980 & JP 55 028632 A (Seiko Instr & Electronics Ltd), 29 Feb. 1980.
Patent Abstracts of Japan, vol. 017, No. 518, (E-1434), 17 Sep. 1993 & JP05 136707 A (Kokusai Electric Co Ltd), 1 Jul. 1993.
Copy of German Search Report, dated 22 Jan. 1997.
Copy of European Search Report for 97107250.9, dated May 09, 1997.
Greitschus Norbert
Theus Ulrich
ITT Manufacturing Enterprises Inc.
Mis David
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