Digital Phase Discriminator
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorFeng-Ming Liu
Life of this patent
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Abstract
A phase discriminator for being used in a phase-locked loop to determine if a phase difference between a reference signal and a target signal has reached a programmable gap value is disclose which comprises a programmable phase gap selector receiving the reference signal, a first phase digital converter converting an output signal from the programmable phase gap selector to a first digital code, a second phase digital converter converting a phase difference between the target signal and the reference signal to a second digital code, and a code comparator comparing the first and second digital code and generating a first instructional signal based on a change of order of the values of the first and second digital code.
Claims20
A phase discriminator, comprising:
- a programmable phase gap selector receiving a reference signal;
- a first phase digital converter converting an output signal from the programmable phase gap selector to a first digital code;
- a second phase digital converter converting a phase difference between a target signal and the reference signal to a second digital code;
- and
- a code comparator comparing the first and second digital code and generating a first instructional signal based on a change of order of the values of the first and second digital code.
A phase discriminator, comprising:
- a programmable phase gap selector receiving a reference signal;
- a first phase digital converter converting an output signal from the programmable phase gap selector to a first digital code;
- a second phase digital converter converting a phase difference between a target signal and the reference signal to a second digital code;
- a code comparator comparing the first and second digital code and generating a first instructional signal based on a change of order of the values of the first and second digital code;
- and
- a signal confirmation module receiving the first instructional signal from the code comparator and generating a confirmed second instructional signal.
A method for determining if a phase difference between a reference signal and a target signal has reached a programmable gap value, the method comprising:
- transferring the programmable gap value to a predetermined pulse width of a pulse signal;
- converting the pulse signal to a first digital code;
- converting the phase difference to a second digital code;
- comparing the first and second digital code;
- and
- generating a first instructional signal upon a change of order of values of the first and second digital code.
Dependencies are inferred from the claim text.