Low voltage oscillator for medical devices
First Claim
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1. A mechanical resonator-free low voltage oscillator that produces a stable output frequency with varying supply voltage, the oscillator comprising:
- a replica bias block comprising a differential pair;
wherein the replica bias block further comprises an amplifier coupled to the differential pair in the replica bias block to form a negative feedback;
wherein the output of the amplifier is coupled to a gate of a tail transistor of the differential pair in the replica bias block, wherein a current flowing through the tail transistor remains substantially constant.
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Abstract
Low voltage oscillators that provide a stable output frequency with varying supply voltage are provided. The subject oscillators find use in a variety of different types of devices, e.g., medical devices, including both implantable and ex-vivo devices.
637 Citations
27 Claims
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1. A mechanical resonator-free low voltage oscillator that produces a stable output frequency with varying supply voltage, the oscillator comprising:
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a replica bias block comprising a differential pair; wherein the replica bias block further comprises an amplifier coupled to the differential pair in the replica bias block to form a negative feedback; wherein the output of the amplifier is coupled to a gate of a tail transistor of the differential pair in the replica bias block, wherein a current flowing through the tail transistor remains substantially constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23)
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21. An oscillator comprising:
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a ring oscillator block comprising a number of cascaded differential pairs, wherein the output of a respective differential pair is coupled to the input of the next differential pair; a replica bias block comprising a differential pair with a similar configuration as a respective differential pair in the ring oscillator block, wherein the replica bias block further comprises an amplifier coupled to the differential pair in the replica bias block to form a negative feedback; and wherein the output of the amplifier is coupled to a gate of a tail transistor of the differential pair in the replica bias block, wherein a current flowing through the tail transistor remains substantially constant ; and an output conversion and buffering block coupled to the output of one of the differential pairs in the ring oscillator block to produce an oscillating signal with sufficient voltage swing which facilitates operation with other digital logic circuitry; wherein a gate and source of the tail transistor in the differential pair of the replica bias block are coupled to a gate and source of a tail transistor in each differential pair in the ring oscillator block; wherein a gate-to-source voltage of the tail transistor in the differential pair remains substantially constant during operation, wherein a tail current of each differential pair in the ring oscillator block remains substantially constant; and wherein the oscillator can produce the oscillating signal with substantially constant voltage swing and frequency with a supplied voltage from 0.8 V to 2.1 V.
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24. A medical device comprising mechanical resonator-free low voltage oscillator that produces a stable output frequency with varying supply voltages, the oscillator comprising:
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a replica bias block comprising a differential pair; wherein the replica bias block further comprises an amplifier coupled to the differential pair in the replica bias block to form a negative feedback; wherein the output of the amplifier is coupled to a gate of a tail transistor of the differential pair in the replica bias block, wherein a current flowing through the tail transistor remains substantially constant. - View Dependent Claims (25, 26, 27)
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Specification