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A free-running programmable oscillator which can have its frequency shifted slightly without phase disturbance is constructed using a latch and two delay lines, one of which is programmable.
English (United States)
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Coherent Frequency-Shift Oscillator
A free-running programmable oscillator which can have its frequency shifted
slightly without phase disturbance is constructed using a latch and two delay
lines, one of which is programmable.
The figure shows the oscillator. The Set/Reset latch 1, when set, provides at
its Q output 2 a signal which is delayed by Delay 1 device 3. A short Reset pulse
is generated by an inverter and AND gate 4 associated with Delay 1 device 3.
The length of delay of Delay 1 device 3 determines the up time for the Output
signal at node 5. Once Set/Reset Latch 1 is reset, Delay 2 device 6 and its
associated inverter and AND gate 7 generate a pulse on line 8 to set the
oscillator ON again. Delay 2 device 6 is programmable, so the down time for the
Output signal can be varied to control the oscillation frequency.
The Set pulse for AND gate 7 also goes on line 9 to the CK input of the Data
Latch 10. A new Delay Data value for Delay 2 is clocked at the time that Delay 2
can be considered "inactive", so oscillation is not disturbed when a new
frequency is chosen. The next cycle's down time is simply longer or shorter as
programmed by Delay 2 device 6.