Patent ID: 6759904
Filing Date: 2004-07-06
Classification: H01F,H01L,H03B,H03D,H03F,H03G,H03H,H03J,H03L

Abstract:
An integrated MOS VGA, comprising:a substrate; a first differential pair amplifier disposed upon the substrate and coupled to a VGA output having a gain contributing to VGA gain in direct proportion to the first differential pair amplifier gain; a second differential pair amplifier disposed upon the substrate and coupled to a VGA output having a gain, and coupled to the first differential amplifier such that an increase in second differential pair amplifier gain contributes to a decrease in the VGA gain; and a variable voltage source coupled to the VGA output, a voltage output of the variable voltage source determining respective drain voltages on the first differential pair and the second differential pair based on a differential input signal received at the first differential pair amplifier and the second differential pair amplifier, and thereby controlling the gain of the first differential pair and the gain of the second differential pair.