Electronic device with locally reduced effects on analog signals
AssigneeMicron Technology, Inc.
InventorBrian W. Huber
Life of this patent
Estimating the term…
Abstract
A technique is provided for reducing changes in the amount of a bias voltage that is applied to a device in an integrated circuit due to local changes on a bus providing the reference for the bias voltage signal. Local transients on the reference bus may occur due to the inductance of the integrated circuit packaging. To prevent the local transients from affecting the amount of bias applied to a device, the local bias signal is allowed to move common mode with the local reference signal by isolating the local bias signal from the bias source. The technique also provides for disabling the isolation of the local bias signal from the bias source in response to a control signal.
Claims23
An electronic system comprising:
- a processor;
- a chipset operably connected to the processor;
- and
- an integrated circuit operably connected to the processor, the integrated circuit comprising:
- a first electrical path to carry an analog signal from an analog source;
- a second electrical path to carry a reference signal from a reference source;
- an electrical component having an analog input coupled to the first electrical path and a reference input coupled to the second electrical path;
- an isolation circuit in series with the first electrical path and coupled between the analog source and the analog input;
- a capacitor coupled between the analog input and the reference input;
- and
- an override circuit coupled in parallel with the isolation circuit,
- wherein the isolation circuit cooperates with the capacitor to enable the analog signal at the analog input to move common mode with the reference signal at the reference input, and
- wherein the override circuit is configured to disable the isolation circuit.
An electronic system, comprising
- a processor;
- a chipset operably connected to the processor;
- and
- a memory device operably connected to the processor, the memory device comprising:
- a memory array to store data;
- and
- a data output circuit to output data from the memory array to a data bus, the data output circuit comprising:
- a plurality of drivers to drive the output data onto the data bus, wherein a first driver of the plurality of drivers comprises:
- an analog input to receive an analog signal from an analog source;
- a reference input to receive a reference signal from a reference source;
- wherein the reference input is capacitively coupled to the analog input;
- an isolation circuit to isolate the analog input from the analog source, such that the analog signal at the analog input can move common mode with the reference signal at the reference input;
- and
- an override circuit configured to disable the isolation circuit, such that the analog input is directly coupled to the analog source.
A method of operating an electronic system, the electronic system comprising a processor and an integrated circuit operably connected to the processor, the method comprising the acts of:
- applying a local analog signal to the integrated circuit, the local analog signal being referenced to a local reference signal applied to the device;
- isolating the local analog signal from a source of the local analog signal, such that the local analog signal may move common mode with the local reference signal;
- and
- overriding the isolation of the local analog signal in response to a control signal.
Dependencies are inferred from the claim text.