Structure for a duty cycle correction circuit
First Claim
1. A design structure embodied in a machine readable storage device, wherein the design structure is loaded from the storage device into a computer for designing, manufacturing, or testing an integrated circuit, the design structure comprising:
- first design structure elements representing a first pair of field effect transistors (FETs) having a first P-type FET and a first N-type FET;
second design structure elements representing at least two linear resistors coupled to the first pair of FETs, wherein a first linear resistor is coupled to the first P-type FET and a second linear resistor is coupled to the first N-type FET;
a third design structure element representing a first switch coupled to the first linear resistor; and
a fourth design structure element representing a second switch coupled to the second linear resistor, wherein the first, second, third, and fourth design structure elements are configured such that an input signal is provided to the first pair of FETs and a corrected input signal is output by the at least two linear resistors, and wherein the first and second switches are selectively controlled so as to cause at least one of the first or second linear resistors to increase or decrease a duty cycle of the input signal.
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Accused Products
Abstract
A design structure for a Duty Cycle Correction (DCC) circuit is provide in which pairs of field effect transistors (FETs) in known DCC circuit topologies are replaced with linear resistors coupled to switches of the DCC circuit such that when the switch is open, the input signal is routed through the linear resistors. The linear resistors are more tolerant of process, voltage and temperature (PVT) fluctuations than FETs and thus, the resulting DCC circuit provides a relatively smaller change in DCC correction range with PVT fluctuations than the known DCC circuit topology that employs FETs. The linear resistors may be provided in parallel with the switches and in series with a pair of FETs having relatively large resistance values. The linear resistors provide resistance that pulls-up or pulls-down the pulse width of the input signal so as to provide correction to the duty cycle of the input signal.
62 Citations
14 Claims
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1. A design structure embodied in a machine readable storage device, wherein the design structure is loaded from the storage device into a computer for designing, manufacturing, or testing an integrated circuit, the design structure comprising:
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first design structure elements representing a first pair of field effect transistors (FETs) having a first P-type FET and a first N-type FET; second design structure elements representing at least two linear resistors coupled to the first pair of FETs, wherein a first linear resistor is coupled to the first P-type FET and a second linear resistor is coupled to the first N-type FET; a third design structure element representing a first switch coupled to the first linear resistor; and a fourth design structure element representing a second switch coupled to the second linear resistor, wherein the first, second, third, and fourth design structure elements are configured such that an input signal is provided to the first pair of FETs and a corrected input signal is output by the at least two linear resistors, and wherein the first and second switches are selectively controlled so as to cause at least one of the first or second linear resistors to increase or decrease a duty cycle of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification