Stage having controlled variable resistance load circuit for use in voltage controlled ring oscillator
First Claim
1. A stage for a voltage controlled oscillator, the stage comprising:
- a first p-channel transistor having a gate defining a control node, having a source adapted to be connected to a supply voltage, and having a drain;
a second p-channel transistor having a gate connected to the control node, having a source connected to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain connected to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain connected to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source connected to the sources of the first and second n-channel transistors directing current from the sources of the first and second n-channel transistors;
a first resistor connected between the supply voltage and the drain of the first n-type transistor;
a second resist or connected between the supply voltage and drain of the second n-type transistor;
a first source follower having an input connected to the first node and having an output defining a first output of the stage; and
a second source follower having an input connected to the second node and having an output defining a second output of the stage.
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Accused Products
Abstract
A stage for a ring oscillator, the stage including a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain; a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain; a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source; a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source; a current source coupled to the sources of the first and second n-channel transistors directing current from the sources of the first and second n-channel transistors; a first resistor coupled between the supply voltage and the drain of the first n-type transistor; a second resistor coupled between the supply voltage and drain of the second n-type transistor; a first source follower having an input coupled to the first node and having an output defining a first output of the stage; and a second source follower having an input coupled to the second node and having an output defining a second output of the stage.
98 Citations
20 Claims
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1. A stage for a voltage controlled oscillator, the stage comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be connected to a supply voltage, and having a drain;
a second p-channel transistor having a gate connected to the control node, having a source connected to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain connected to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain connected to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source connected to the sources of the first and second n-channel transistors directing current from the sources of the first and second n-channel transistors;
a first resistor connected between the supply voltage and the drain of the first n-type transistor;
a second resist or connected between the supply voltage and drain of the second n-type transistor;
a first source follower having an input connected to the first node and having an output defining a first output of the stage; and
a second source follower having an input connected to the second node and having an output defining a second output of the stage.
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2. A transmitter including a ring oscillator having a chain of stages, each stage comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be connected to a supply voltage, and having a drain;
a second p-channel transistor having a gate connected to the control node, having a source connected to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain connected to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain connected to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source connected to the sources of the first and second n-channel transistors directing current from the sources of the first and second n-channel transistors;
a first resistor connected between the supply voltage and the drain of the first n-type transistor;
a second resistor connected between the supply voltage and drain of the second n-type transistor;
a first source follower having an input connected to the first node and having an output defining a first output of the stage; and
a second source follower having an input connected to the second node and having an output defining a second output of the stage.
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3. A stage for a voltage controlled oscillator, the stage comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain;
a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source coupled to the sources of the first and second n-channel transistors to direct current from the sources of the first and second n-channel transistors;
a first load coupled between the supply voltage and the drain of the first n-type transistor;
a second load coupled between the supply voltage and drain of the second n-type transistor;
a first source follower having an input coupled to the first node and having an output defining a first output of the stage; and
a second source follower having an input coupled to the second node and having an output defining a second output of the stage. - View Dependent Claims (4, 5)
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6. A transmitter including a ring oscillator having a plurality of chained stages, at least one of the stages comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain;
a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source coupled to the sources of the first and second n-channel transistors to direct current from the sources of the first and second n-channel transistors;
a first load coupled between the supply voltage and the drain of the first n-type transistor;
a second load coupled between the supply voltage and drain of the second n-type transistor;
a first source follower having an input coupled to the first node and having an output defining a first output of the stage; and
a second source follower having an input coupled to the second node and having an output defining a second output of the stage. - View Dependent Claims (7, 8)
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9. A stage for a voltage controlled oscillator, the stage comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain;
a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source coupled to the sources of the first and second n-channel transistors to direct current from the sources of the first and second n-channel transistors;
a first load coupled between the supply voltage and the drain of the first n-type transistor;
a second load coupled between the supply voltage and drain of the second n-type transistor;
a first output coupled to the first node; and
a second output coupled to the second node. - View Dependent Claims (10, 11)
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12. A transmitter including a ring oscillator having a plurality of chained stages, at least one of the stages comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain;
a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source;
if a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source coupled to the sources of the first and second n-channel transistors to direct current from the sources of the first and second n-channel transistors;
a first load coupled between the supply voltage and the drain of the first n-type transistor;
a second load coupled between the supply voltage and drain of the second n-type transistor;
a first output coupled to the first node; and
a second output coupled to the second node. - View Dependent Claims (13, 14)
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15. A voltage controlled oscillator including a plurality of stages, at least one of the stages comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain;
a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source coupled to the sources of the first and second n-channel transistors to direct current from the sources of the first and second n-channel transistors;
a first load coupled between the supply voltage and the drain of the first n-type transistor;
a second load coupled between the supply voltage and drain of the second n-type transistor;
a first source follower having an input coupled to the first node and having an output defining a first output of the stage; and
a second source follower having an input coupled to the second node and having an output defining a second output of the stage. - View Dependent Claims (16, 17)
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18. A voltage controlled oscillator including a plurality of stages, at least one of the stages comprising:
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a first p-channel transistor having a gate defining a control node, having a source adapted to be coupled to a supply voltage, and having a drain;
a second p-channel transistor having a gate coupled to the control node, having a source coupled to the supply voltage, and having a drain;
a first n-channel transistor having a gate defining a first input, having a drain coupled to the drain of the first p-channel transistor and defining a first node, and having a source;
a second n-channel transistor having a gate defining a second input, having a drain coupled to the drain of the second p-channel transistor and defining a second node, and having a source;
a current source coupled to the sources of the first and second n-channel transistors to direct current from the sources of the first and second n-channel transistors;
a first load coupled between the supply voltage and the drain of the first n-type transistor;
a second load coupled between the supply voltage and drain of the second n-type transistor;
a first output coupled to the first node; and
a second output coupled to the second node. - View Dependent Claims (19, 20)
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Specification