Dual Output Oscillator with Adjustable Phase and Duty-cycle
Publication Date: 2008-Mar-05
The IP.com Prior Art Database
Dual Output Oscillator
with Adjustable Phase and Duty-cycle
When a dual output oscillator is needed, it is desirable to be able to adjust the phase between the two outputs, while the duty cycles of each output remains adjustable and independent of the phase adjustment.
Description of the Invention
What is the problem to be solved?
How to generate two outputs from a single oscillator with the two outputs being phase shifted with identical duty cycle?
1MHz Oscillator core principle:
V+>V- NodeCmp = 1
V-<V+ NodeCmp = 0
Figure 1. Principle of a simple 1MHz oscillator.
Figure 2. The OutputOsc signal shape versus time and the phase shifter signal to be generated.
A new schematic will be presented to generate the OutputShifted signal from the OutputOsc signal.
This new proposed schematic takes into account process variations of the simple oscillator shown in Figure 1, and does not alter its behavior even if a new structure is added.
Again, the overall architecture needs to operate regardless of external noise and current spike size and shape.
DBLO Block Diagram
Voltage level definition:
levhig = threshold1 ; levlow=threshold2 ; levlow < levint < levhig
Figure 3. Logical structures.
NodeCapa > levint
NodeCpsh < levlow...