Guest
Hi,
In my project, I drive an oscillating device (oscillator) with an VCO
reference signal. In order to lock the oscillator's frequency, a PLL is
employed. To keep the device oscillating the input frequency needs to
be hit at least as precise as 0.005 Hz.
The problem, though, when the oscillator is changed, its center
frequency changes, too. It can be in the range between 11.75kHz-12kHz.
Because of other clocks that need to be synchronized and generated, the
VCO's output frequency must be in the range 13.865-14.16 MHz. Actually,
a VCXO would fit my needs best to tune the frequency as accurate as 5.9
Hz at 14 MHz (0.005 Hz at 12kHz). However, if I pick a VCXO for say
14.1 MHz that is +/-100ppm pullable, it may work with some oscillators,
but not with all possible.
So, I need a VCO whose center freqency is coarse adjustable in a
relatively wide band (13.8-14.2 MHz) and it should have a fine
frequency tuning resolution using the input voltage.
Has anyone an idea what VCO could fit for this?
Thanks,
Stefan
In my project, I drive an oscillating device (oscillator) with an VCO
reference signal. In order to lock the oscillator's frequency, a PLL is
employed. To keep the device oscillating the input frequency needs to
be hit at least as precise as 0.005 Hz.
The problem, though, when the oscillator is changed, its center
frequency changes, too. It can be in the range between 11.75kHz-12kHz.
Because of other clocks that need to be synchronized and generated, the
VCO's output frequency must be in the range 13.865-14.16 MHz. Actually,
a VCXO would fit my needs best to tune the frequency as accurate as 5.9
Hz at 14 MHz (0.005 Hz at 12kHz). However, if I pick a VCXO for say
14.1 MHz that is +/-100ppm pullable, it may work with some oscillators,
but not with all possible.
So, I need a VCO whose center freqency is coarse adjustable in a
relatively wide band (13.8-14.2 MHz) and it should have a fine
frequency tuning resolution using the input voltage.
Has anyone an idea what VCO could fit for this?
Thanks,
Stefan