Low frequency doubler

Details Low frequency doubler Low frequency doubler

2007-06-26

2007-06-26

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S074000, C327S113000, C327S116000, C327S119000, C327S122000

Reexamination Certificate

active

11133024

ABSTRACT:
A circuit and corresponding method for doubling the frequency of an input signal, even when the input signal is of low frequency or a square wave. The input signal is applied to a phase-shifting circuit that produces a pair of output signals that are theoretically 90° apart in phase, but may lack the desired form if the original input signal is of low frequency. The waveforms of the two output signals are enhanced in latching hysteresis buffers that produce more uniformly squared waves, with zero crossings corrected to be more exactly 90° apart and with desirably steep state transitions. The enhanced-waveform output signals are coupled to an exclusive OR (XOR) gate to produce a double-frequency output.

REFERENCES:
patent: 6369622 (2002-04-01), Lim et al.
Moghimi R: “Curing Comparator instability with Hysteresis”, Analog Dialogue Analog Devices USA, vol. 34, No. 7, Nov. 2000, p. 3 pp. XP002386469, ISSN: 0161-3626, p. 2, left-hand column.
International Search Report for corres. PCT/US2006/007885, completed Jun. 21, 2006 by V. Robinson, Authorized Officer of the EPO.

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