Integrated circuit implementation of a frequency shift keying os

Details Integrated circuit implementation of a frequency shift keying os Integrated circuit implementation of a frequency shift keying os

1998-02-02

2000-06-20

Kinkead, Arnold

Oscillators

With frequency adjusting means

Step-frequency change

331185, 375272, 332102, H04L 2712

Patent

active

060782269

ABSTRACT:
A multiple frequency shifting oscillator that will provide a plurality of frequencies dependent upon a contents of an input shifting signal an input shifting signal is disclosed. The multiple frequency shifting oscillator has an amplifier with first input, a second input, which is coupled to a ground reference potential and an output. The multiple frequency shifting oscillator has a first impedance that is coupled between the first input of the amplifier and the ground reference potential, a second impedance that is coupled between the output of the amplifier and the ground reference potential, and a third impedance coupled between the output and the input of the amplifier. The multiple frequency shifting oscillator has a plurality of frequency shifting impedances that when selected will be coupled to the first impedance so as to shift the frequency of the multiple frequency shifting oscillator. Each of a plurality of switches is connected to each of the frequency shifting impedances and to the first impedance so as to select any of the frequency shifting impedances to the first impedance to shift the frequency according to the digital input signal. A frequency shifting controller will selectively activate any of the plurality of switches to select any of the plurality of frequency shifting impedances dependent upon contents of input shifting signal. The base biasing current source will have a power down switch to disable the base biasing current source during periods of time when the multiple frequency shifting oscillator is not active.

REFERENCES:
patent: 3991389 (1976-11-01), Dwire et al.
patent: 4618966 (1986-10-01), Stepp et al.
patent: 5367537 (1994-11-01), Anderson
patent: 5532654 (1996-07-01), Ieki et al.
patent: 5550505 (1996-08-01), Gaus, Jr.
patent: 5793261 (1998-08-01), Boling, III

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