Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Reexamination Certificate
2001-05-02
2003-03-04
Nguyen, Minh (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
C327S116000, C327S254000, C377S047000, C708S103000
Reexamination Certificate
active
06529052
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an electronic device comprising a generator of periodic signals and at least a frequency multiplier circuit for multiplying their frequency, formed on the basis of an <<EXCLUSIVE-OR>> gate which receives said periodic signals.
The invention finds highly significant applications notably in the field of telecommunications using high frequencies.
Such a device is known from the patent document U.S. Pat. No. 5,864,246. In this patent document it is proposed to use a phase shifting element which produces a delayed replica of the clock signal, so that an EXCLUSIVE-OR gate, by combining the clock signal and the replica, produces the signal at double frequency.
The device known from this patent document has the drawback that the replicas of judiciously phase-shifted high-frequency signals are not easy to realize, notably at high frequencies, and are thus costly to implement.
SUMMARY OF THE INVENTION
The present invention proposes a device of the type defined in the opening paragraph, which avoids the use of such phase shifting elements.
Therefore, such a device is characterized in that it comprises a frequency divider circuit connected between the output and an input of said EXCLUSIVE-OR gate.
According to a preferred embodiment of the invention, such a device is characterized in that said multiplier circuit has outputs for producing signals which are phase shifted by 90° at the frequency of said periodic signals.
This embodiment offers the advantage that it becomes easy and less costly to realize demodulations known by the name of <<0 demodulation>>.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
REFERENCES:
patent: 4020422 (1977-04-01), Underhill
patent: 4590440 (1986-05-01), Haque et al.
patent: 4689577 (1987-08-01), Vreeken et al.
patent: 5180994 (1993-01-01), Martin et al.
patent: 5864246 (1999-01-01), Anderson
patent: 6154482 (2000-11-01), Inuzuka
Biren Steven R.
Koninklijke Philips Electronics , N.V.
Nguyen Minh
LandOfFree
Frequency multiplier based on exclusive-or gate and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency multiplier based on exclusive-or gate and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency multiplier based on exclusive-or gate and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3064843