Low-noise reference voltage generator
AssigneeXilinx, Inc.
InventorsYipeng Wang, Kee Hian Tan
Life of this patent
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Abstract
A reference voltage generator is disclosed. The reference voltage generator may include an operational transconductance amplifier (OTA), a bias generator, a first flipped voltage follower, a bias filter, a control signal filter, and a second flipped voltage follower. The OTA and the first flipped voltage follower may generate a control signal based on a reference voltage and a bias voltage from the bias generator. The bias filter may filter the bias voltage and the control signal filter may filter the control signal. The second flipped voltage follower may generate the output voltage based on the filtered bias voltage and the filtered control signal.
Claims16
An apparatus, comprising:
- a first flipped voltage follower (FVF) configured to generate a control signal based at least in part on a reference voltage;
- a control signal filter configured to filter one or more frequencies of the control signal;
- and
- a second FVF configured to generate a regulated output voltage based at least in part on the filtered control signal the reference voltage, and a bias voltage;
- and
- a bias filter configured to filter one or more frequencies of the bias voltage and generate a filtered bias voltage for the second FVF, wherein the regulated output voltage is based at least in part on the filtered bias voltage.
An apparatus, comprising:
- a bias generator configured to generate a bias voltage;
- a first flipped voltage follower (FVF) configured to generate a first output voltage based at least in part on the bias voltage;
- a bias filter configured to filter the bias voltage;
- and
- a second FVF configured to generate a second output voltage based at least in part on the filtered bias voltage;
- and
- an operational transconductance amplifier configured to generate a control signal based at least in part on a reference voltage and the first output voltage from the first FVF.
A method of generating a regulated output voltage comprising:
- generating, by a first flipped voltage follower (FVF), a control signal based at least in part on a reference voltage and a bias voltage;
- filtering the control signal;
- filtering, by a second low-pass filter, the bias voltage;
- and
- generating a regulated output voltage based at least in part on the filtered control signal and the filtered bias voltage.
Dependencies are inferred from the claim text.