Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1996-06-21
1998-07-28
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
327119, 377 47, H03B 1900
Patent
active
057867151
ABSTRACT:
A programmable digital frequency multiplier includes either a delay locked loop with an input clock or a ring oscillator which generates multiple phase delayed clock signals having a common frequency equal to that of the input clock and a corresponding number of equidistant phases. In the delay locked loop, a phase comparator compares the phase of the input clock as received by the first inverter circuit with the phase of the output of the last inverter circuit and generates an error signal which is used as a circuit bias control signal for each of the inverter circuits, thereby controlling the phase delay through each inverter circuit. The multiple inverter circuit output signals are individually gated in separate NOR gates with a corresponding number of frequency programming bits. The resulting NORed output signals are then processed together in an exclusive-NOR gate, thereby generating an output signal having a frequency which is an integer multiple of the input clock frequency with the integer multiple corresponding to the bit pattern of the frequency programming bits.
REFERENCES:
patent: 3414720 (1968-12-01), Battarel
patent: 3829665 (1974-08-01), Pocock et al.
patent: 3992612 (1976-11-01), Dunn
patent: 5463337 (1995-10-01), Leonowich
patent: 5530387 (1996-06-01), Kim
patent: 5548235 (1996-08-01), Marbot
patent: 5563554 (1996-10-01), Mizuno
Callahan Timothy P.
Lam T. T.
Sun Microsystems Inc.
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