Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating
Patent
1998-06-01
2000-06-13
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Clock or pulse waveform generating
227295, H03K 513
Patent
active
060753986
ABSTRACT:
A tunable digital oscillator circuit comprises a first dual-clock pulse generator, a second dual-clock pulse generator, a run controller, a stop controller and a decoder. The first and second dual-clock pulse generators are coupled in a cascaded manner with the output of the first dual-clock pulse generator provided as an input to the second dual-clock pulse generator. Each of the first and second dual-clock pulse generators is preferably tunable, in that, they can output one clock signal from a predetermined number of frequencies. The run controller is preferably coupled to receive a start signal and the output of the second dual-clock pulse generator. The run controller provides the input to begin and maintain the first and second dual-clock pulse generators in the state of generating a clock signal. The stop controller is coupled to receive a clock signal from the first dual-clock pulse generator, and a stop signal. The tunable digital oscillator circuit can start or stop the clock within two clock cycles. The decoder receives a period select signal and provides a control signal to the first and second dual-clock pulse generators to select one of a predetermined number of frequencies for the clock signal.
REFERENCES:
patent: 5003194 (1991-03-01), Engelhard
patent: 5568075 (1996-10-01), Curran et al.
patent: 5656961 (1997-08-01), Tran et al.
Lam Tuan T.
S3 Incorporated
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