| 摘要 |
A differential amplifier with adjustable linearity is disclosed herein. The differential amplifier includes a differential pair amplifier and a linearization circuit. The differential pair amplifier receives a differential input voltage and amplifies the differential input voltage to produce an amplified output voltage. The linearization circuit receives the amplified output voltage and generates a compensation signal in response thereto. The compensation signal, which has a magnitude adjustable in response to a linearity adjustment signal, is applied to the differential pair amplifier. The differential pair amplifier uses the compensation signal to apply compensation to the amplification of the differential input voltage. Thus, the linearity of the differential amplifier is adjustable by modifying the linearity adjustment signal. The differential pair amplifier includes a bipolar differential transistor pair having their emitters coupled together to form a common emitter node. A first adjustable current source coupled to the common emitter node provides a gain adjustment signal for adjusting the gain of the differential pair amplifier. The linearization circuit includes a diode element pair having their cathodes coupled together to form a common cathode node. A second adjustable current source coupled to the common cathode node provides the linearity adjustment signal for adjusting the linearity of the differential pair. In another embodiment, the differential pair amplifier includes a differential common-base amplifier.
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