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AssigneeAltera Corporation
InventorsArch Zaliznyak, William Bereza, Henry Lui, Chong Lee, Rakesh Patel
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Circuitry is provided that conditions a differential input signal such that when the signal is received by a multi-standard differential input buffer, the buffer is able to process the conditioned signal without pronounced increases in propagation delay, thereby keeping signal jitter to a minimum. The circuitry further enables input buffers to operate according to desired operating parameters even when the supply voltage powering the input buffer is relatively low. The circuitry operates by shifting the common-mode voltage to a range that puts the input buffer in a favorable common-mode voltage range of operation. The circuitry may be coupled with a programmably controlled amplifier that amplifies the amplitude of the conditioned differential signal prior to being received by the input buffer. Amplifying the signal prevents problems typically associated with data-dependent jitter and intersymbol interference by boosting the voltage amplitude to a level that is readily processed by the input buffer.
Circuitry for use with differential input circuitry that is powered by a low voltage power supply which provides a predetermined low voltage level, comprising:
A method of using circuitry that includes first and second networks coupled to a low voltage power supply that provides a predetermined voltage level, each network including a pair of resistors and a capacitor, the circuitry coupled to receive a differential signal and is coupled to a multi-standard differential input buffer, wherein the input buffer is coupled to said low voltage power supply, the method comprising:
A method of using circuitry that includes an amplifier and first and second networks, each network including a pair of resistors and a capacitor, the circuitry coupled to receive a differential signal and is coupled to a multi-standard differential input buffer, the method comprising:
Dependencies are inferred from the claim text.