| 摘要 |
<p>Class A gain control systems having extremely good linearity and wide dynamic range, and suitable for monolithic integration, are described in embodiments realizing several classical multiplier functions such as voltage controlled attenuators, exponentially controlled multipliers and four quadrant multipliers. Two identical current circuits (200, 300), each comprising a matched, emitter coupled pair of transistors, or effective transistors, are fed from an actively linearized input circuit which derives the required well balanced signals from a single ended or balanced input source, and current mirror circuits (400, 500) are used to subtract unwanted common mode products from the output signals.</p> |
