Current controlled variable frequency oscillator having an impro

Details Current controlled variable frequency oscillator having an impro Current controlled variable frequency oscillator having an impro

1993-04-20

1996-10-08

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455258, 330257, 330260, 331135, 331177R, H04B 126, H03F 345, H03B 520

Patent

active

055640893

ABSTRACT:
A current controlled variable frequency oscillator (260) operates at a characteristic frequency that is determined primarily by a scaled current. A filter cascade (320) receives the scaled current for setting a filter cascade frequency substantially equal to the characteristic frequency. Additionally, the filter cascade (320) receives a triangular signal at a non-inverting input, the filter cascade (320) converting the triangular signal into a sinewave signal. A lowpass filter (330) receives the scaled current for setting a lowpass filter frequency to a frequency substantially less than the characteristic frequency. The lowpass filter (330) also receives the sinewave signal and provides an average signal therefrom. A comparator (340) receives the scaled current, wherein the comparator (340) compares the sinewave signal and the average signal for providing a substantially squarewave signal therefrom. An integrator (310) is provided for receiving the scaled current, the integrator (310) integrating the substantially squarewave signal for providing the triangular signal therefrom.

REFERENCES:
patent: 4524334 (1985-06-01), Brajder et al.
patent: 4667166 (1987-05-01), Itoh
patent: 4675594 (1987-06-01), Reinke
patent: 4891609 (1990-01-01), Eilley
patent: 4965529 (1990-11-01), Laug
patent: 5117205 (1992-05-01), Nauta
patent: 5155452 (1992-10-01), Ueda et al.
patent: 5208552 (1993-05-01), Ryat
Analog VLSI and Neural Systems, Carver Mead "California Institute of Technology" Addison-Wesley Publishing Company (pp. 70-71, 147-158, 186-190).

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