Patent ID: 6525609
Filing Date: 2003-02-25
Classification: H01F,H01L,H03B,H03D,H03F,H03G,H03H,H03J,H03L

Abstract:
An integrated MOS VGA having improved dynamic range, 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 control current split between the first differential pair amplifier and the second differential pair amplifier such that current to the second differential pair amplifier is not greater than current applied to the first differential pair amplifier and applied such that an increase in the control current causes an increase in the VGA gain.