Variable gain amplifier

摘要

According to an embodiment, a variable gain amplifier includes a differential transistor pair including a first and second transistor. A variable resistor for setting a gain is connected between electrodes the transistor pair. A first variable capacitor is connected to an electrode of the first transistor, and a second variable capacitor is connected to an electrode of the second transistor. Corresponding to the gain setting set by adjusting the variable resistor, capacitance values of the variable capacitors can be adjusted to provide improved frequency characteristics of the variable gain amplifier.

主权项

1. A variable gain amplifier, comprising:
a differential transistor pair including a first transistor and a second transistor, the first and second transistors each having a first electrode, a second electrode, and a gate electrode; a variable resistor connected between the first electrode of the first transistor and the first electrode of the second transistor; a first variable capacitor connected to the first electrode of the first transistor; a second variable capacitor connected to the first electrode of the second transistor; a third variable capacitor connected to the second electrode of the first transistor; and a fourth variable capacitor connected to the second electrode of the second transistor.