Circuit yields ultralow-noise VGA

Posted on Apr 3, 2012

A number of single-chip VGAs variable-gain amplifiers are available today. Unfortunately, they all have drawbacks, such as high noise, 55V limit, low input impedance, or nonlinear gain/frequency characteristics. The circuit in Figure 1 is a 16-step, ultralow-noise VGA that solves many of these problems.

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