Programmable ring oscillator
First Claim
Patent Images
1. A programmable ring oscillator comprising:
- a plurality of series coupled inverter gates; and
a plurality of bypass means coupled between the outputs of selected ones of said plurality of inverter gates to alter the frequency of said oscillator, each of said bypass means including a laser trimmable fuse.
1 Assignment
0 Petitions
Accused Products
Abstract
This relates to a programmable ring oscillator which comprises a plurality of series coupled gates the output of the last of which is fed back to the input of the first. Bypass means are coupled across the outputs of selected gates so as to in effect increase or decrease the length of the string. In one embodiment, laser trimmable fuses are employed in the bypass networks. In a second embodiment, a data selector under external control is employed.
-
Citations
8 Claims
-
1. A programmable ring oscillator comprising:
-
a plurality of series coupled inverter gates; and a plurality of bypass means coupled between the outputs of selected ones of said plurality of inverter gates to alter the frequency of said oscillator, each of said bypass means including a laser trimmable fuse. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A programmable ring oscillator comprising:
- a plurality of series coupled gates; and
at least one bypass means coupled between the outputs of first and second selected ones of said plurality to alter the frequency of said oscillator, wherein said bypass means is a data select switch having first and second data inputs, a control input, and a data output, said first and second data inputs being coupled to the outputs of first and second selected ones respectively of said plurality and said control input being coupled to a control signal which determines which of said first and second data inputs is coupled to said data output. - View Dependent Claims (8)
- a plurality of series coupled gates; and
Specification