METHODS AND APPARATUS TO STRUCTURE ENVELOPE DETECTOR CIRCUITRY FOR ON-OFF KEYING MODULATION

Abstract

An example apparatus includes: rectifier circuitry including: a first resistor having a terminal; a second resistor having a terminal; a first transistor having a first terminal, a second terminal, and a control terminal; and a second transistor having a first terminal, a second terminal, and a control terminal; reference circuitry having a first input, a second input, a third input, a fourth input, and an output, the first input of the reference circuitry coupled to the control terminal of the first transistor, the second input of the reference circuitry coupled to the terminal of the second resistor and first terminal of the second transistor, the third input of the reference circuitry coupled to the control terminal of the second transistor, the fourth input of the reference circuitry coupled to the terminal of the first resistor and the first terminal of the first transistor.

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