Programmable oscillator circuit

Details Programmable oscillator circuit Programmable oscillator circuit

2005-10-11

2005-10-11

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S018000, C331S016000, C331S179000

Reexamination Certificate

active

06954113

ABSTRACT:
A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.

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