Apparatus and methods for electronic amplification

摘要

Apparatus and methods for electronic amplification are provided. In one embodiment, an amplifier includes first and second input terminals, an amplification circuit, a feedback circuit, and a current mirror. The amplification circuit includes a non-inverting voltage input electrically connected to the first input terminal and to a bias voltage, an inverting voltage input electrically connected to the second input terminal, a voltage output, and a current output. The amplifier includes a first feedback path from the voltage output to the inverting voltage input through the feedback circuit and a second feedback path from the current output to the inverting voltage input through the current mirror, which can mirror a current from the current output to generate a mirrored current. A current source such as a transducer can provide an input current between the first and second input terminals, and the mirrored current can substantially match the input current.

主权项

1. An amplifier comprising:
an amplification circuit comprising a first voltage input, a second voltage input, a voltage output, and a current output, wherein the amplification circuit is configured to control a voltage level of the voltage output by amplifying a voltage difference between the first and second voltage inputs, and wherein the amplification circuit is further configured to generate a first current on the current output based on the voltage difference between the first and second voltage inputs; a feedback circuit electrically connected between the voltage output of the amplification circuit and the second voltage input of the amplification circuit; a current mirror including a current input electrically connected to the current output of the amplification circuit and a first current output electrically connected to the second voltage input of the amplification circuit, wherein the current mirror is configured to receive the first current at the current input and to mirror the first current to generate a second current at the first current output; a first input terminal electrically connected to the first voltage input of the amplification circuit; and a second input terminal electrically connected to the second voltage input of the amplification circuit, wherein the amplifier is configured to receive an input signal corresponding to an input current flowing between the first input terminal and the second input terminal.