Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1995-01-27
1996-05-28
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 8, 331 14, 331 17, 331 25, 331 34, 331 57, 331111, H03B 500, H03K 3354, H03L 7097
Patent
active
055215564
ABSTRACT:
A monolithic frequency converter using a feedback control loop generates a source of synthesized frequency signals over a wide dynamic range based on a timing source such as a crystal oscillator or an external frequency source. The frequency converter includes a controlled oscillator, a frequency counter, a timing signal generator and, connected between the frequency counter and the controlled oscillator, a digital to analog converter and a difference integrator. The controlled oscillator generates a clock signal at a frequency controlled by an electrical signal. The difference integrator is connected to an input signal terminal and connected to the timing signal generator. The difference integrator determines a difference signal between the input signal and a signal operated upon by the digital to analog converter and integrates the difference signal under control of a timing signal generated by the timing signal generator. The frequency converter has a highly linear transfer function which is established by the resolution of a frequency counter. For example, a transfer function having approximately 0.1% accuracy in linearity is achieved using a 10-bit resolution frequency counter. Using indirect frequency synthesis, the controlled oscillator generates precisely controlled timing signals.
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Derosier Timothy
Edmondson Charles A.
Ercanbrack Morgan K.
O'Shaughnessy Timothy G.
American Microsystems, Inc.
Grimm Siegfried H.
Koestner Ken J.
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