APPARATUS AND METHOD FOR A PVT INDEPENDENT RC DELAY
First Claim
1. A delay circuit configured to receive an input signal and to provide a delayed representation of the input signal at an output, the delay circuit comprising:
- a resistor configured to pass a compensation current;
a capacitor configured to receive a charge current based on the compensation current;
a first compensation circuit configured to provide a control signal, the first compensation circuit comprising;
an inverter circuit configured to track an inverter threshold voltage across process, voltage and temperature variations, wherein an output of the inverter circuit is directly coupled to an input of the inverter circuit;
an amplifier configured to receive the output of the inverter circuit an provide the control signal; and
a charge-current coupling circuit configured to receive the control signal and to provide the compensation current and the charge current.
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Accused Products
Abstract
Apparatus and methods for a delay circuit are provided. In an example, a delay circuit can include a resistor configured to receive a compensation current, a capacitor configured to receive a charge current based on the compensation current, a first compensation circuit configured to provide a control signal, and a charge-current coupling circuit. The first compensation circuit can include an inverter circuit configured to track an inverter threshold voltage across process, voltage and temperature variations, wherein an output of the inverter circuit is directly coupled to an input of the inverter circuit, and an amplifier configured to receive the output of the inverter circuit an provide the control signal. The charge-current coupling circuit can be configured to receive the control signal and to provide the compensation current and the charge current.
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Citations
22 Claims
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1. A delay circuit configured to receive an input signal and to provide a delayed representation of the input signal at an output, the delay circuit comprising:
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a resistor configured to pass a compensation current; a capacitor configured to receive a charge current based on the compensation current; a first compensation circuit configured to provide a control signal, the first compensation circuit comprising; an inverter circuit configured to track an inverter threshold voltage across process, voltage and temperature variations, wherein an output of the inverter circuit is directly coupled to an input of the inverter circuit; an amplifier configured to receive the output of the inverter circuit an provide the control signal; and a charge-current coupling circuit configured to receive the control signal and to provide the compensation current and the charge current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for providing a delayed representation of an input signal at an output of a delay circuit, the method comprising:
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passing a compensation current at a resistor of the delay circuit; generating a charge current representative of the compensation current; receiving the charge current at a capacitor of the delay circuit; tracking an inverter threshold voltage of an inverter circuit of a first compensation circuit across process, voltage and temperature variations using an output of the inverter circuit, wherein the output of the inverter circuit is directly coupled to an input of the inverter circuit; receiving the output of the inverter circuit at an amplifier of the first compensation circuit; providing a control signal at an output of the amplifier; receiving the control signal at a charge-current coupling circuit; and providing the compensation current and the charge current using the charge-current coupling circuit and the control signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification