Output buffer having supply filters
AssigneeMicron Technology, Inc.
InventorDaniele Vimercati
Life of this patent
Estimating the term…
Abstract
An electronic device may include one or more output buffers each including a pair of final p-channel metal oxide semiconductor (PMOS) and n-channel metal oxide semiconductor (NMOS) transistors, a first pre-buffer to drive the PMOS transistor, and a second pre-buffer to drive the NMOS transistor. Each output buffer receives power from a pre-buffer supply filtering circuit, which may include a supply capacitor for stabilizing supply voltage, a low-pass first pre-buffer supply filter to filter the voltage supplied to the first pre-buffer, and a low-pass second pre-buffer supply filter the voltage supplied to the second pre-buffer.
Claims20
An electronic device, comprising:
- a data input;
- a data output;
- a transistor coupled to the data output;
- a pre-buffer coupled between the data input and the transistor and configured to drive the transistor and to receive a filtered supply voltage signal;
- a low-pass filter having a filter input to receive an output stage supply voltage signal and a filter output coupled to the pre-buffer, the low-pass filter configured to produce the filtered supply voltage signal by filtering the received output stage supply voltage signal;
- and
- a supply capacitor coupled to the filter input,
- wherein the low-pass filter includes a resistor and a capacitor.
An electronic device, comprising:
- an output stage supply voltage node to receive an output stage supply voltage signal;
- multiple output buffer circuits each coupled to the output stage supply voltage node and including:
- a data input;
- a data output;
- a transistor coupled to the data output;
- a pre-buffer coupled between the data input and the transistor and configured to be powered by a filtered supply voltage signal and to drive the transistor;
- and
- a low-pass filter having a filter input coupled to the output stage supply voltage node and a filter output coupled to the pre-buffer and configured to produce the filtered supply voltage signal by filtering the output stage supply voltage signal;
- and
- a memory circuit coupled to the data input of each output buffer circuit of the multiple output buffer circuits.
A method for driving a transistor in a data output stage of an electronic device, the method comprising:
- using a pre-buffer to drive the transistor;
- powering the pre-buffer using a filtered supply voltage signal;
- receiving an output stage supply voltage signal;
- providing the filtered supply voltage signal by using a low-pass filter to filter the received output stage supply voltage signal;
- stabilizing the output stage supply voltage signal using a supply capacitor;
- and
- using the pre-buffer and the transistor in an output buffer of a memory device.
Dependencies are inferred from the claim text.