Fast current-based envelope detector
OwnerSubhashish Mukherjee, Anoop Narayan Bhatinventors
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Abstract
A reduced-stage feedback-based envelope detector includes, for example, an input rectifier for rectifying a received modulated input signal and an amplifier for receiving the rectified modulated input signal at an input node. The amplifier compares the rectified modulated input signal with a reference signal, filters the rectified modulated input signal at the input node, and generates an envelope detection signal in response to the comparison and the filtering of the rectified modulated input signal. In an embodiment, the gain of the amplifier is independently determined from the bandwidth of the amplifier.
Claims7
A circuit, comprising:
- an input rectifier having a first input, a second input, and an output, the input rectifier including:
- a first transistor having a first gate node and a first channel node, the first gate node is coupled to the first input;
- and
- a second transistor having a second gate node and a second channel node, the second gate node is coupled to the second input and the second channel node is coupled to the first channel node of the first transistor;
- a first current source having an output, the output of the first current source is coupled to the output of the input rectifier;
- a third transistor having a third gate node and a third channel node, the third gate node is coupled to the output of the input rectifier;
- a fourth transistor having a fourth channel node, the fourth channel node is coupled to the third channel node of the third transistor;
- and
- a second current source having an output, the output of the second current source is coupled to the third channel node of the third transistor and the fourth channel node of the fourth transistor.
Dependencies are inferred from the claim text.