Ring oscillator architecture with controlled sensitivity to supply voltage
First Claim
1. An apparatus for controlling a supply sensitivity of a ring oscillator stage, comprising:
- an inverting module configured to output an inverted version of a received input;
a PMOS biasing module coupled to the inverting module and comprising at least one element having a tunable resistance based on a first bias signal;
an NMOS biasing module coupled to the inverting module and comprising at least one element having a tunable resistance based on a second bias signal; and
a voltage biasing module configured to generate the first bias signal for the PMOS biasing module based on a supply voltage and generate the second bias signal for the NMOS biasing module based on the supply voltage, the voltage biasing module comprising a first PMOS transistor, an NMOS transistor, a second PMOS transistor, and a current source, wherein a drain of the first PMOS transistor is coupled to a drain of the NMOS transistor and to the PMOS biasing module, wherein a gate of the NMOS transistor is coupled to the NMOS biasing module, and wherein a gate of the first PMOS transistor is coupled to a gate of the second PMOS transistor,wherein a source of the first PMOS transistor is coupled to the supply voltage,wherein a source of the second PMOS transistor is coupled to the supply voltage,wherein a drain of the second PMOS transistor is coupled to a first node of the current source and the gate of the NMOS transistor and coupled to the gate of the second PMOS transistor,wherein the PMOS biasing module biases the inverting module based on the first bias signal,wherein the NMOS biasing module biases the inverting module based on the second bias signal, andwherein the inverting module outputs the inverted version of the received input based on the NMOS biasing module bias and the PMOS biasing module bias.
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Abstract
A method and apparatus for controlling a supply sensitivity of a ring oscillator stage are provided. The apparatus is configured to generate, via a voltage biasing module, a first bias signal for a PMOS biasing module based on a supply voltage and a second bias signal for a NMOS biasing module based on the supply voltage, bias, via the PMOS biasing module, triode PMOS degeneration of the inverting module based on the first bias signal, bias, via the NMOS biasing module, triode NMOS degeneration of the inverting module based on the second bias signal, receive an input via an inverting module, and output, via the inverting module, an inverted version of the received input based on the biased triode NMOS degeneration and the biased triode PMOS degeneration.
15 Citations
26 Claims
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1. An apparatus for controlling a supply sensitivity of a ring oscillator stage, comprising:
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an inverting module configured to output an inverted version of a received input; a PMOS biasing module coupled to the inverting module and comprising at least one element having a tunable resistance based on a first bias signal; an NMOS biasing module coupled to the inverting module and comprising at least one element having a tunable resistance based on a second bias signal; and a voltage biasing module configured to generate the first bias signal for the PMOS biasing module based on a supply voltage and generate the second bias signal for the NMOS biasing module based on the supply voltage, the voltage biasing module comprising a first PMOS transistor, an NMOS transistor, a second PMOS transistor, and a current source, wherein a drain of the first PMOS transistor is coupled to a drain of the NMOS transistor and to the PMOS biasing module, wherein a gate of the NMOS transistor is coupled to the NMOS biasing module, and wherein a gate of the first PMOS transistor is coupled to a gate of the second PMOS transistor, wherein a source of the first PMOS transistor is coupled to the supply voltage, wherein a source of the second PMOS transistor is coupled to the supply voltage, wherein a drain of the second PMOS transistor is coupled to a first node of the current source and the gate of the NMOS transistor and coupled to the gate of the second PMOS transistor, wherein the PMOS biasing module biases the inverting module based on the first bias signal, wherein the NMOS biasing module biases the inverting module based on the second bias signal, and wherein the inverting module outputs the inverted version of the received input based on the NMOS biasing module bias and the PMOS biasing module bias. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a supply sensitivity of a ring oscillator stage, comprising:
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generating, via a voltage biasing module, a first bias signal for a PMOS biasing module based on a supply voltage and a second bias signal for an NMOS biasing module based on the supply voltage, the first bias signal being provided from a node to which a drain of an NMOS transistor and a drain of a first PMOS transistor in the voltage biasing module are coupled, the second biasing signal being provided from a node coupled to a gate of the NMOS transistor, wherein the drain of the first PMOS transistor is not connected to a gate of the first PMOS transistor, wherein the voltage biasing module further comprises a second PMOS transistor and a current source;
a source of the first PMOS transistor is coupled to the supply voltage, and the gate of the first PMOS transistor is coupled to a gate of the second PMOS transistor,wherein a source of the second PMOS transistor is coupled to the supply voltage, and wherein a drain of the second PMOS transistor is coupled to a first node of the current source and the gate of the NMOS transistor and coupled to the gate of the second PMOS transistor, tuning a resistance of at least one element of the PMOS biasing module based on the first bias signal; tuning a resistance of at least one element of the NMOS biasing module based on the second bias signal; biasing, via the PMOS biasing module, PMOS degeneration of an inverting module based on the tuned resistance of the at least one element of the PMOS biasing module; biasing, via the NMOS biasing module, NMOS degeneration of the inverting module based on the tuned resistance of the at least one element of the NMOS biasing module; receiving an input via the inverting module; and outputting, via the inverting module, an inverted version of the received input based on the NMOS degeneration and the PMOS degeneration. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus for controlling a supply sensitivity of a ring oscillator stage, comprising:
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inverting means for receiving an input and outputting an inverted version of the received input; PMOS biasing means for biasing PMOS degeneration of the inverting means, the PMOS biasing means comprising means for tuning a resistance of the PMOS biasing means based on a first bias signal; NMOS biasing means for biasing NMOS degeneration of the inverting means, the NMOS biasing means comprising means for tuning a resistance of the NMOS biasing means based on a second bias signal; and voltage biasing means for generating the first bias signal for the PMOS biasing means based on a supply voltage and the second bias signal for the NMOS biasing means based on the supply voltage, the voltage biasing means comprising a first PMOS transistor, an NMOS transistor, a second PMOS transistor and means for providing a current comprising a current source, wherein a drain of the first PMOS transistor is coupled to a drain of the NMOS transistor and to the PMOS biasing means, wherein a gate of the NMOS transistor is coupled to the NMOS biasing means, and wherein a source of the NMOS transistor is coupled to the means for providing current, and wherein a source of the first PMOS transistor is coupled to the supply voltage and the gate of the first PMOS transistor is coupled to a gate of the second PMOS transistor, wherein a source of the second PMOS transistor is coupled to the supply voltage, wherein a drain of the second PMOS transistor is coupled to a first node of the current source and the gate of the NMOS transistor and coupled to the gate of the second PMOS transistor, and wherein the inverted version of the received input is outputted via the inverting means based on the biased NMOS degeneration and the biased PMOS degeneration. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification