Direct-type binary frequency synthesizer

Details Direct-type binary frequency synthesizer Direct-type binary frequency synthesizer

1981-08-17

1984-01-10

Grimm, Siegfried H.

Oscillators

Beat frequency

Plural beating

331 40, H03B 2102

Patent

active

044255527

ABSTRACT:
An apparatus including means for providing at least five fixed internal frequency signals having five different values of frequencies in which all of said frequencies are coupled into a first processor stage comprised of a single pole double throw switch controlled by a first input bit command signal for selecting either of two of said five frequencies for coupling into a first frequency mixer. A third frequency signal is also coupled into the first frequency mixer which provides a first difference frequency output signal that is coupled into a second frequency mixer. The second frequency mixer is coupled to a second single pole double throw switch controlled by a second input bit command signal for selecting either of the fourth or the fifth of said five frequencies. The difference output signal of the second frequency mixer is coupled to a frequency divider capable of division by four. The output signal produced by the frequency divider is a discrete synthesizer frequency output signal selected from a range of frequency output signals in accordance with the input bit command signal.Additional identical processor stages may be added to provide smaller increments between the selectable discrete synthesizer frequency output signals.

REFERENCES:
patent: 3017579 (1962-01-01), Brack
patent: 3372347 (1968-03-01), Jones et al.
patent: 3906388 (1975-09-01), Jones et al.

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