| CPC H03K 5/08 (2013.01) | 20 Claims |

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1. A system comprising:
a transmitter; and
a receiver coupled to the transmitter, the receiver including:
a preamplifier; and
an envelope detector coupled to the preamplifier, wherein the envelope detector includes:
a signal detection circuit;
a clamp circuit coupled to the signal detection circuit;
a reference voltage circuit coupled to the clamp circuit; and
a comparator including a first input coupled to the reference voltage circuit, and a second input coupled to the signal detection circuit.
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