Receiver with switched current feedback for controlled hysteresis
AssigneesInfineon Technologies AG, International Business Machines Corporation
InventorsOliver Kiehl, Russ Houghton
Life of this patent
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Abstract
A receiver circuit, in accordance with the present invention, includes a first stage having an input for receiving input signals and an output node. The first stage includes an amplifier, and a second stage includes an input coupled to the output of the first stage. The second stage also includes a logic gate coupled to the output of the first stage, the logic gate having an output representing the output of the receiver circuit, and a feed back element coupled from the logic gate output and connecting to a switching element. The switching element, being responsive to the logic gate output, switches a current source on and off to adjust a switchpoint of the receiver circuit.
Claims30
A receiver circuit comprising:
- a first stage having an input for receiving an input signal and an output node, the first stage including an amplifier having a base current source;
- a second stage having an input coupled to the output of the first stage, the second stage further comprising:
- a logic gate coupled to the output of the first stage, the logic gate having an output representing the output of the receiver circuit;
- and
- a feed back element coupled from the logic gate output and connecting to a switching element, the switching element, being responsive to the logic gate output, for switching a current source on and off to adjust a switchpoint of the receiver circuit, wherein the current source supplies a current which tracks current through the base current source.
A receiver circuit comprising:
- a first stage having an input for receiving an input signal, the first stage including an amplifier with a first node employed as an output and a second node, the amplifier having a base current source;
- a second stage having an input coupled to the first node, the second stage further comprising:
- a logic gate having an input coupled to the first node, the logic gate having an output representing the output of the receiver circuit;
- a switching element coupled to the first node and being responsive to the first node for switching a current source on and off such that the current source adjusts a current at the first node to control a switchpoint at the logic gate output, wherein the current source having a current magnitude which tracks current through the base current source;
- and
- a feed back element coupled to the switching element and connecting to the second node of the amplifier for providing feedback for adjusting the current at the first node.
Dependencies are inferred from the claim text.